Implement --tweak, --no-tweak, --no-tweak-hlinked options.

[rsync/rsync.git] / generator.c

/*
 * Routines that are exclusive to the generator process.
 *
 * Copyright (C) 1996-2000 Andrew Tridgell
 * Copyright (C) 1996 Paul Mackerras
 * Copyright (C) 2002 Martin Pool <mbp@samba.org>
 * Copyright (C) 2003-2008 Wayne Davison
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, visit the http://fsf.org website.
 */

#include "rsync.h"

extern int verbose;
extern int dry_run;
extern int do_xfers;
extern int stdout_format_has_i;
extern int logfile_format_has_i;
extern int am_root;
extern int am_server;
extern int am_daemon;
extern int inc_recurse;
extern int do_progress;
extern int relative_paths;
extern int implied_dirs;
extern int keep_dirlinks;
extern int preserve_acls;
extern int preserve_xattrs;
extern int preserve_links;
extern int preserve_devices;
extern int preserve_specials;
extern int preserve_hard_links;
extern int preserve_executability;
extern int preserve_perms;
extern int preserve_times;
extern int uid_ndx;
extern int gid_ndx;
extern int delete_mode;
extern int delete_before;
extern int delete_during;
extern int delete_after;
extern int msgdone_cnt;
extern int ignore_errors;
extern int remove_source_files;
extern int delay_updates;
extern int update_only;
extern int ignore_existing;
extern int ignore_non_existing;
extern int inplace;
extern int tweak_attrs;
extern int append_mode;
extern int make_backups;
extern int csum_length;
extern int ignore_times;
extern int size_only;
extern OFF_T max_size;
extern OFF_T min_size;
extern int io_error;
extern int flist_eof;
extern int allowed_lull;
extern int sock_f_out;
extern int ignore_timeout;
extern int protocol_version;
extern int file_total;
extern int fuzzy_basis;
extern int always_checksum;
extern int checksum_len;
extern char *partial_dir;
extern char *basis_dir[];
extern int compare_dest;
extern int copy_dest;
extern int link_dest;
extern int whole_file;
extern int list_only;
extern int read_batch;
extern int safe_symlinks;
extern long block_size; /* "long" because popt can't set an int32. */
extern int unsort_ndx;
extern int max_delete;
extern int force_delete;
extern int one_file_system;
extern struct stats stats;
extern dev_t filesystem_dev;
extern mode_t orig_umask;
extern uid_t our_uid;
extern char *backup_dir;
extern char *backup_suffix;
extern int backup_suffix_len;
extern struct file_list *cur_flist, *first_flist, *dir_flist;
extern struct filter_list_struct daemon_filter_list;

int ignore_perishable = 0;
int non_perishable_cnt = 0;
int maybe_ATTRS_REPORT = 0;

static dev_t dev_zero;
static int deletion_count = 0; /* used to implement --max-delete */
static int deldelay_size = 0, deldelay_cnt = 0;
static char *deldelay_buf = NULL;
static int deldelay_fd = -1;
static int lull_mod;
static int dir_tweaking;
static int symlink_timeset_failed_flags;
static int need_retouch_dir_times;
static int need_retouch_dir_perms;
static const char *solo_file = NULL;

/* For calling delete_item() and delete_dir_contents(). */
#define DEL_NO_UID_WRITE        (1<<0) /* file/dir has our uid w/o write perm */
#define DEL_RECURSE             (1<<1) /* if dir, delete all contents */
#define DEL_DIR_IS_EMPTY        (1<<2) /* internal delete_FUNCTIONS use only */
#define DEL_FOR_FILE            (1<<3) /* making room for a replacement file */
#define DEL_FOR_DIR             (1<<4) /* making room for a replacement dir */
#define DEL_FOR_SYMLINK         (1<<5) /* making room for a replacement symlink */
#define DEL_FOR_DEVICE          (1<<6) /* making room for a replacement device */
#define DEL_FOR_SPECIAL         (1<<7) /* making room for a replacement special */

#define DEL_MAKE_ROOM (DEL_FOR_FILE|DEL_FOR_DIR|DEL_FOR_SYMLINK|DEL_FOR_DEVICE|DEL_FOR_SPECIAL)

enum nonregtype {
    TYPE_DIR, TYPE_SPECIAL, TYPE_DEVICE, TYPE_SYMLINK
};

enum delret {
    DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
};

/* Forward declarations. */
static enum delret delete_dir_contents(char *fname, uint16 flags);
#ifdef SUPPORT_HARD_LINKS
static void handle_skipped_hlink(struct file_struct *file, int itemizing,
                                 enum logcode code, int f_out);
#endif

static int is_backup_file(char *fn)
{
        int k = strlen(fn) - backup_suffix_len;
        return k > 0 && strcmp(fn+k, backup_suffix) == 0;
}

/* Delete a file or directory.  If DEL_RECURSE is set in the flags, this will
 * delete recursively.
 *
 * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
 * a directory! (The buffer is used for recursion, but returned unchanged.)
 */
static enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
{
        enum delret ret;
        char *what;
        int ok;

        if (verbose > 2) {
                rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
                        fbuf, (int)mode, (int)flags);
        }

        if (flags & DEL_NO_UID_WRITE)
                do_chmod(fbuf, mode | S_IWUSR);

        if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
                int save_uid_ndx = uid_ndx;
                /* This only happens on the first call to delete_item() since
                 * delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
                if (!uid_ndx)
                        uid_ndx = ++file_extra_cnt;
                ignore_perishable = 1;
                /* If DEL_RECURSE is not set, this just reports emptiness. */
                ret = delete_dir_contents(fbuf, flags);
                ignore_perishable = 0;
                if (!save_uid_ndx) {
                        --file_extra_cnt;
                        uid_ndx = 0;
                }
                if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
                        goto check_ret;
                /* OK: try to delete the directory. */
        }

        if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && ++deletion_count > max_delete)
                return DR_AT_LIMIT;

        if (S_ISDIR(mode)) {
                what = "rmdir";
                ok = do_rmdir(fbuf) == 0;
        } else if (make_backups > 0 && (backup_dir || !is_backup_file(fbuf))) {
                what = "make_backup";
                ok = make_backup(fbuf);
        } else {
                what = "unlink";
                ok = robust_unlink(fbuf) == 0;
        }

        if (ok) {
                if (!(flags & DEL_MAKE_ROOM))
                        log_delete(fbuf, mode);
                ret = DR_SUCCESS;
        } else {
                if (S_ISDIR(mode) && errno == ENOTEMPTY) {
                        rprintf(FINFO, "cannot delete non-empty directory: %s\n",
                                fbuf);
                        ret = DR_NOT_EMPTY;
                } else if (errno != ENOENT) {
                        rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
                                what, fbuf);
                        ret = DR_FAILURE;
                } else {
                        deletion_count--;
                        ret = DR_SUCCESS;
                }
        }

  check_ret:
        if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
                const char *desc;
                switch (flags & DEL_MAKE_ROOM) {
                case DEL_FOR_FILE: desc = "regular file"; break;
                case DEL_FOR_DIR: desc = "directory"; break;
                case DEL_FOR_SYMLINK: desc = "symlink"; break;
                case DEL_FOR_DEVICE: desc = "device file"; break;
                case DEL_FOR_SPECIAL: desc = "special file"; break;
                default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
                }
                rprintf(FERROR_XFER, "could not make way for new %s: %s\n",
                        desc, fbuf);
        }
        return ret;
}

/* The directory is about to be deleted: if DEL_RECURSE is given, delete all
 * its contents, otherwise just checks for content.  Returns DR_SUCCESS or
 * DR_NOT_EMPTY.  Note that fname must point to a MAXPATHLEN buffer!  (The
 * buffer is used for recursion, but returned unchanged.)
 */
static enum delret delete_dir_contents(char *fname, uint16 flags)
{
        struct file_list *dirlist;
        enum delret ret;
        unsigned remainder;
        void *save_filters;
        int j, dlen;
        char *p;

        if (verbose > 3) {
                rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
                        fname, flags);
        }

        dlen = strlen(fname);
        save_filters = push_local_filters(fname, dlen);

        non_perishable_cnt = 0;
        dirlist = get_dirlist(fname, dlen, 0);
        ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;

        if (!dirlist->used)
                goto done;

        if (!(flags & DEL_RECURSE)) {
                ret = DR_NOT_EMPTY;
                goto done;
        }

        p = fname + dlen;
        if (dlen != 1 || *fname != '/')
                *p++ = '/';
        remainder = MAXPATHLEN - (p - fname);

        /* We do our own recursion, so make delete_item() non-recursive. */
        flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
              | DEL_DIR_IS_EMPTY;

        for (j = dirlist->used; j--; ) {
                struct file_struct *fp = dirlist->files[j];

                if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
                        if (verbose > 1) {
                                rprintf(FINFO,
                                    "mount point, %s, pins parent directory\n",
                                    f_name(fp, NULL));
                        }
                        ret = DR_NOT_EMPTY;
                        continue;
                }

                strlcpy(p, fp->basename, remainder);
                if (!(fp->mode & S_IWUSR) && !am_root && (uid_t)F_OWNER(fp) == our_uid)
                        do_chmod(fname, fp->mode | S_IWUSR);
                /* Save stack by recursing to ourself directly. */
                if (S_ISDIR(fp->mode)) {
                        if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
                                ret = DR_NOT_EMPTY;
                }
                if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
                        ret = DR_NOT_EMPTY;
        }

        fname[dlen] = '\0';

  done:
        flist_free(dirlist);
        pop_local_filters(save_filters);

        if (ret == DR_NOT_EMPTY) {
                rprintf(FINFO, "cannot delete non-empty directory: %s\n",
                        fname);
        }
        return ret;
}

static int start_delete_delay_temp(void)
{
        char fnametmp[MAXPATHLEN];
        int save_dry_run = dry_run;

        dry_run = 0;
        if (!get_tmpname(fnametmp, "deldelay")
         || (deldelay_fd = do_mkstemp(fnametmp, 0600)) < 0) {
                rprintf(FINFO, "NOTE: Unable to create delete-delay temp file%s.\n",
                        inc_recurse ? "" : " -- switching to --delete-after");
                delete_during = 0;
                delete_after = !inc_recurse;
                dry_run = save_dry_run;
                return 0;
        }
        unlink(fnametmp);
        dry_run = save_dry_run;
        return 1;
}

static int flush_delete_delay(void)
{
        if (deldelay_fd < 0 && !start_delete_delay_temp())
                return 0;
        if (write(deldelay_fd, deldelay_buf, deldelay_cnt) != deldelay_cnt) {
                rsyserr(FERROR, errno, "flush of delete-delay buffer");
                delete_during = 0;
                delete_after = !inc_recurse;
                close(deldelay_fd);
                return 0;
        }
        deldelay_cnt = 0;
        return 1;
}

static int remember_delete(struct file_struct *file, const char *fname, int flags)
{
        int len;

        if (deldelay_cnt == deldelay_size && !flush_delete_delay())
                return 0;

        if (flags & DEL_NO_UID_WRITE)
                deldelay_buf[deldelay_cnt++] = '!';

        while (1) {
                len = snprintf(deldelay_buf + deldelay_cnt,
                               deldelay_size - deldelay_cnt,
                               "%x %s%c",
                               (int)file->mode, fname, '\0');
                if ((deldelay_cnt += len) <= deldelay_size)
                        break;
                deldelay_cnt -= len;
                if (!flush_delete_delay())
                        return 0;
        }

        return 1;
}

static int read_delay_line(char *buf, int *flags_p)
{
        static int read_pos = 0;
        int j, len, mode;
        char *bp, *past_space;

        while (1) {
                for (j = read_pos; j < deldelay_cnt && deldelay_buf[j]; j++) {}
                if (j < deldelay_cnt)
                        break;
                if (deldelay_fd < 0) {
                        if (j > read_pos)
                                goto invalid_data;
                        return -1;
                }
                deldelay_cnt -= read_pos;
                if (deldelay_cnt == deldelay_size)
                        goto invalid_data;
                if (deldelay_cnt && read_pos) {
                        memmove(deldelay_buf, deldelay_buf + read_pos,
                                deldelay_cnt);
                }
                len = read(deldelay_fd, deldelay_buf + deldelay_cnt,
                           deldelay_size - deldelay_cnt);
                if (len == 0) {
                        if (deldelay_cnt) {
                                rprintf(FERROR,
                                    "ERROR: unexpected EOF in delete-delay file.\n");
                        }
                        return -1;
                }
                if (len < 0) {
                        rsyserr(FERROR, errno,
                                "reading delete-delay file");
                        return -1;
                }
                deldelay_cnt += len;
                read_pos = 0;
        }

        bp = deldelay_buf + read_pos;
        if (*bp == '!') {
                bp++;
                *flags_p = DEL_NO_UID_WRITE;
        } else
                *flags_p = 0;

        if (sscanf(bp, "%x ", &mode) != 1) {
          invalid_data:
                rprintf(FERROR, "ERROR: invalid data in delete-delay file.\n");
                return -1;
        }
        past_space = strchr(bp, ' ') + 1;
        len = j - read_pos - (past_space - bp) + 1; /* count the '\0' */
        read_pos = j + 1;

        if (len > MAXPATHLEN) {
                rprintf(FERROR, "ERROR: filename too long in delete-delay file.\n");
                return -1;
        }

        /* The caller needs the name in a MAXPATHLEN buffer, so we copy it
         * instead of returning a pointer to our buffer. */
        memcpy(buf, past_space, len);

        return mode;
}

static void do_delayed_deletions(char *delbuf)
{
        int mode, flags;

        if (deldelay_fd >= 0) {
                if (deldelay_cnt && !flush_delete_delay())
                        return;
                lseek(deldelay_fd, 0, 0);
        }
        while ((mode = read_delay_line(delbuf, &flags)) >= 0)
                delete_item(delbuf, mode, flags | DEL_RECURSE);
        if (deldelay_fd >= 0)
                close(deldelay_fd);
}

/* This function is used to implement per-directory deletion, and is used by
 * all the --delete-WHEN options.  Note that the fbuf pointer must point to a
 * MAXPATHLEN buffer with the name of the directory in it (the functions we
 * call will append names onto the end, but the old dir value will be restored
 * on exit). */
static void delete_in_dir(char *fbuf, struct file_struct *file, dev_t *fs_dev)
{
        static int already_warned = 0;
        struct file_list *dirlist;
        char delbuf[MAXPATHLEN];
        int dlen, i;
        int save_uid_ndx = uid_ndx;

        if (!fbuf) {
                change_local_filter_dir(NULL, 0, 0);
                return;
        }

        if (verbose > 2)
                rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);

        if (allowed_lull)
                maybe_send_keepalive();

        if (io_error && !ignore_errors) {
                if (already_warned)
                        return;
                rprintf(FINFO,
                        "IO error encountered -- skipping file deletion\n");
                already_warned = 1;
                return;
        }

        dlen = strlen(fbuf);
        change_local_filter_dir(fbuf, dlen, F_DEPTH(file));

        if (one_file_system) {
                if (file->flags & FLAG_TOP_DIR)
                        filesystem_dev = *fs_dev;
                else if (filesystem_dev != *fs_dev)
                        return;
        }

        if (!uid_ndx)
                uid_ndx = ++file_extra_cnt;

        dirlist = get_dirlist(fbuf, dlen, 0);

        /* If an item in dirlist is not found in flist, delete it
         * from the filesystem. */
        for (i = dirlist->used; i--; ) {
                struct file_struct *fp = dirlist->files[i];
                if (!F_IS_ACTIVE(fp))
                        continue;
                if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
                        if (verbose > 1)
                                rprintf(FINFO, "cannot delete mount point: %s\n",
                                        f_name(fp, NULL));
                        continue;
                }
                if (flist_find(cur_flist, fp) < 0) {
                        int flags = DEL_RECURSE;
                        if (!(fp->mode & S_IWUSR) && !am_root && (uid_t)F_OWNER(fp) == our_uid)
                                flags |= DEL_NO_UID_WRITE;
                        f_name(fp, delbuf);
                        if (delete_during == 2) {
                                if (!remember_delete(fp, delbuf, flags))
                                        break;
                        } else
                                delete_item(delbuf, fp->mode, flags);
                }
        }

        flist_free(dirlist);

        if (!save_uid_ndx) {
                --file_extra_cnt;
                uid_ndx = 0;
        }
}

/* This deletes any files on the receiving side that are not present on the
 * sending side.  This is used by --delete-before and --delete-after. */
static void do_delete_pass(void)
{
        char fbuf[MAXPATHLEN];
        STRUCT_STAT st;
        int j;

        /* dry_run is incremented when the destination doesn't exist yet. */
        if (dry_run > 1 || list_only)
                return;

        for (j = 0; j < cur_flist->used; j++) {
                struct file_struct *file = cur_flist->sorted[j];

                if (!(file->flags & FLAG_CONTENT_DIR))
                        continue;

                f_name(file, fbuf);
                if (verbose > 1 && file->flags & FLAG_TOP_DIR)
                        rprintf(FINFO, "deleting in %s\n", fbuf);

                if (link_stat(fbuf, &st, keep_dirlinks) < 0
                 || !S_ISDIR(st.st_mode))
                        continue;

                delete_in_dir(fbuf, file, &st.st_dev);
        }
        delete_in_dir(NULL, NULL, &dev_zero);

        if (do_progress && !am_server)
                rprintf(FINFO, "                    \r");
}

int unchanged_attrs(const char *fname, struct file_struct *file, stat_x *sxp)
{
#if !defined HAVE_LUTIMES || !defined HAVE_UTIMES
        if (S_ISLNK(file->mode)) {
                ;
        } else
#endif
        if (preserve_times && cmp_time(sxp->st.st_mtime, file->modtime) != 0)
                return 0;

        if (preserve_perms) {
                if (!BITS_EQUAL(sxp->st.st_mode, file->mode, CHMOD_BITS))
                        return 0;
        } else if (preserve_executability
         && ((sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0)))
                return 0;

        if (am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file))
                return 0;

        if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP) && sxp->st.st_gid != (gid_t)F_GROUP(file))
                return 0;

#ifdef SUPPORT_ACLS
        if (preserve_acls && !S_ISLNK(file->mode)) {
                if (!ACL_READY(*sxp))
                        get_acl(fname, sxp);
                if (set_acl(NULL, file, sxp) == 0)
                        return 0;
        }
#endif
#ifdef SUPPORT_XATTRS
        if (preserve_xattrs) {
                if (!XATTR_READY(*sxp))
                        get_xattr(fname, sxp);
                if (xattr_diff(file, sxp, 0))
                        return 0;
        }
#endif

        return 1;
}

void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statret,
             stat_x *sxp, int32 iflags, uchar fnamecmp_type,
             const char *xname)
{
        if (statret >= 0) { /* A from-dest-dir statret can == 1! */
                int keep_time = !preserve_times ? 0
                    : S_ISDIR(file->mode) ? preserve_times > 1 :
#if defined HAVE_LUTIMES && defined HAVE_UTIMES
                    1;
#else
                    !S_ISLNK(file->mode);
#endif

                if (S_ISREG(file->mode) && F_LENGTH(file) != sxp->st.st_size)
                        iflags |= ITEM_REPORT_SIZE;
                if (file->flags & FLAG_TIME_FAILED) { /* symlinks only */
                        if (iflags & ITEM_LOCAL_CHANGE)
                                iflags |= symlink_timeset_failed_flags;
                } else if (keep_time
                 ? cmp_time(file->modtime, sxp->st.st_mtime) != 0
                 : iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !(iflags & ITEM_MATCHED)
                  && (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
                        iflags |= ITEM_REPORT_TIME;
#if !defined HAVE_LCHMOD && !defined HAVE_SETATTRLIST
                if (S_ISLNK(file->mode)) {
                        ;
                } else
#endif
                if (preserve_perms) {
                        if (!BITS_EQUAL(sxp->st.st_mode, file->mode, CHMOD_BITS))
                                iflags |= ITEM_REPORT_PERMS;
                } else if (preserve_executability
                 && ((sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0)))
                        iflags |= ITEM_REPORT_PERMS;
                if (uid_ndx && am_root && (uid_t)F_OWNER(file) != sxp->st.st_uid)
                        iflags |= ITEM_REPORT_OWNER;
                if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
                    && sxp->st.st_gid != (gid_t)F_GROUP(file))
                        iflags |= ITEM_REPORT_GROUP;
#ifdef SUPPORT_ACLS
                if (preserve_acls && !S_ISLNK(file->mode)) {
                        if (!ACL_READY(*sxp))
                                get_acl(fnamecmp, sxp);
                        if (set_acl(NULL, file, sxp) == 0)
                                iflags |= ITEM_REPORT_ACL;
                }
#endif
#ifdef SUPPORT_XATTRS
                if (preserve_xattrs) {
                        if (!XATTR_READY(*sxp))
                                get_xattr(fnamecmp, sxp);
                        if (xattr_diff(file, sxp, 1))
                                iflags |= ITEM_REPORT_XATTR;
                }
#endif
        } else {
#ifdef SUPPORT_XATTRS
                if (preserve_xattrs && xattr_diff(file, NULL, 1))
                        iflags |= ITEM_REPORT_XATTR;
#endif
                iflags |= ITEM_IS_NEW;
        }

        iflags &= 0xffff;
        if ((iflags & (SIGNIFICANT_ITEM_FLAGS|ITEM_REPORT_XATTR) || verbose > 1
          || stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
                if (protocol_version >= 29) {
                        if (ndx >= 0)
                                write_ndx(sock_f_out, ndx);
                        write_shortint(sock_f_out, iflags);
                        if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
                                write_byte(sock_f_out, fnamecmp_type);
                        if (iflags & ITEM_XNAME_FOLLOWS)
                                write_vstring(sock_f_out, xname, strlen(xname));
#ifdef SUPPORT_XATTRS
                        if (iflags & ITEM_REPORT_XATTR && !dry_run)
                                send_xattr_request(NULL, file, sock_f_out);
#endif
                } else if (ndx >= 0) {
                        enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
                        log_item(code, file, &stats, iflags, xname);
                }
        }
}


/* Perform our quick-check heuristic for determining if a file is unchanged. */
int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
{
        if (st->st_size != F_LENGTH(file))
                return 0;

        /* if always checksum is set then we use the checksum instead
           of the file time to determine whether to sync */
        if (always_checksum > 0 && S_ISREG(st->st_mode)) {
                char sum[MAX_DIGEST_LEN];
                file_checksum(fn, sum, st->st_size);
                return memcmp(sum, F_SUM(file), checksum_len) == 0;
        }

        if (size_only > 0)
                return 1;

        if (ignore_times)
                return 0;

        return cmp_time(st->st_mtime, file->modtime) == 0;
}


/*
 * set (initialize) the size entries in the per-file sum_struct
 * calculating dynamic block and checksum sizes.
 *
 * This is only called from generate_and_send_sums() but is a separate
 * function to encapsulate the logic.
 *
 * The block size is a rounded square root of file length.
 *
 * The checksum size is determined according to:
 *     blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
 * provided by Donovan Baarda which gives a probability of rsync
 * algorithm corrupting data and falling back using the whole md4
 * checksums.
 *
 * This might be made one of several selectable heuristics.
 */
static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
{
        int32 blength;
        int s2length;

        if (block_size)
                blength = block_size;
        else if (len <= BLOCK_SIZE * BLOCK_SIZE)
                blength = BLOCK_SIZE;
        else {
                int32 c;
                int64 l;
                int cnt;
                for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
                if (cnt >= 31 || c >= MAX_BLOCK_SIZE)
                        blength = MAX_BLOCK_SIZE;
                else {
                    blength = 0;
                    do {
                            blength |= c;
                            if (len < (int64)blength * blength)
                                    blength &= ~c;
                            c >>= 1;
                    } while (c >= 8);   /* round to multiple of 8 */
                    blength = MAX(blength, BLOCK_SIZE);
                }
        }

        if (protocol_version < 27) {
                s2length = csum_length;
        } else if (csum_length == SUM_LENGTH) {
                s2length = SUM_LENGTH;
        } else {
                int32 c;
                int64 l;
                int b = BLOCKSUM_BIAS;
                for (l = len; l >>= 1; b += 2) {}
                for (c = blength; (c >>= 1) && b; b--) {}
                /* add a bit, subtract rollsum, round up. */
                s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
                s2length = MAX(s2length, csum_length);
                s2length = MIN(s2length, SUM_LENGTH);
        }

        sum->flength    = len;
        sum->blength    = blength;
        sum->s2length   = s2length;
        sum->remainder  = (int32)(len % blength);
        sum->count      = (int32)(len / blength) + (sum->remainder != 0);

        if (sum->count && verbose > 2) {
                rprintf(FINFO,
                        "count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
                        (double)sum->count, (long)sum->remainder, (long)sum->blength,
                        sum->s2length, (double)sum->flength);
        }
}


/*
 * Generate and send a stream of signatures/checksums that describe a buffer
 *
 * Generate approximately one checksum every block_len bytes.
 */
static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
{
        int32 i;
        struct map_struct *mapbuf;
        struct sum_struct sum;
        OFF_T offset = 0;

        sum_sizes_sqroot(&sum, len);
        write_sum_head(f_out, &sum);

        if (append_mode > 0 && f_copy < 0)
                return;

        if (len > 0)
                mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
        else
                mapbuf = NULL;

        for (i = 0; i < sum.count; i++) {
                int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
                char *map = map_ptr(mapbuf, offset, n1);
                char sum2[SUM_LENGTH];
                uint32 sum1;

                len -= n1;
                offset += n1;

                if (f_copy >= 0) {
                        full_write(f_copy, map, n1);
                        if (append_mode > 0)
                                continue;
                }

                sum1 = get_checksum1(map, n1);
                get_checksum2(map, n1, sum2);

                if (verbose > 3) {
                        rprintf(FINFO,
                                "chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
                                (double)i, (double)offset - n1, (long)n1,
                                (unsigned long)sum1);
                }
                write_int(f_out, sum1);
                write_buf(f_out, sum2, sum.s2length);
        }

        if (mapbuf)
                unmap_file(mapbuf);
}


/* Try to find a filename in the same dir as "fname" with a similar name. */
static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
{
        int fname_len, fname_suf_len;
        const char *fname_suf, *fname = file->basename;
        uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
        int j, lowest_j = -1;

        fname_len = strlen(fname);
        fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);

        for (j = 0; j < dirlist->used; j++) {
                struct file_struct *fp = dirlist->files[j];
                const char *suf, *name;
                int len, suf_len;
                uint32 dist;

                if (!S_ISREG(fp->mode) || !F_LENGTH(fp)
                 || fp->flags & FLAG_FILE_SENT)
                        continue;

                name = fp->basename;

                if (F_LENGTH(fp) == F_LENGTH(file)
                    && cmp_time(fp->modtime, file->modtime) == 0) {
                        if (verbose > 4) {
                                rprintf(FINFO,
                                        "fuzzy size/modtime match for %s\n",
                                        name);
                        }
                        return j;
                }

                len = strlen(name);
                suf = find_filename_suffix(name, len, &suf_len);

                dist = fuzzy_distance(name, len, fname, fname_len);
                /* Add some extra weight to how well the suffixes match. */
                dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
                      * 10;
                if (verbose > 4) {
                        rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
                                name, (int)(dist>>16), (int)(dist&0xFFFF));
                }
                if (dist <= lowest_dist) {
                        lowest_dist = dist;
                        lowest_j = j;
                }
        }

        return lowest_j;
}

/* Copy a file found in our --copy-dest handling. */
static int copy_altdest_file(const char *src, const char *dest, struct file_struct *file)
{
        char buf[MAXPATHLEN];
        const char *copy_to, *partialptr;
        int ok, fd_w;

        if (inplace) {
                /* Let copy_file open the destination in place. */
                fd_w = -1;
                copy_to = dest;
        } else {
                fd_w = open_tmpfile(buf, dest, file);
                if (fd_w < 0)
                        return -1;
                copy_to = buf;
        }
        cleanup_set(copy_to, NULL, NULL, -1, -1);
        if (copy_file(src, copy_to, fd_w, file->mode, 0) < 0) {
                if (verbose) {
                        rsyserr(FINFO, errno, "copy_file %s => %s",
                                full_fname(src), copy_to);
                }
                /* Try to clean up. */
                unlink(copy_to);
                cleanup_disable();
                return -1;
        }
        partialptr = partial_dir ? partial_dir_fname(dest) : NULL;
        ok = finish_transfer(dest, copy_to, src, partialptr, file, 1, 0);
        cleanup_disable();
        return ok ? 0 : -1;
}

/* This is only called for regular files.  We return -2 if we've finished
 * handling the file, -1 if no dest-linking occurred, or a non-negative
 * value if we found an alternate basis file. */
static int try_dests_reg(struct file_struct *file, char *fname, int ndx,
                         char *cmpbuf, stat_x *sxp, int itemizing,
                         enum logcode code)
{
        int best_match = -1;
        int match_level = 0;
        int j = 0;

        do {
                pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
                if (link_stat(cmpbuf, &sxp->st, 0) < 0 || !S_ISREG(sxp->st.st_mode))
                        continue;
                switch (match_level) {
                case 0:
                        best_match = j;
                        match_level = 1;
                        /* FALL THROUGH */
                case 1:
                        if (!unchanged_file(cmpbuf, file, &sxp->st))
                                continue;
                        best_match = j;
                        match_level = 2;
                        /* FALL THROUGH */
                case 2:
                        if (!unchanged_attrs(cmpbuf, file, sxp))
                                continue;
                        best_match = j;
                        match_level = 3;
                        break;
                }
                break;
        } while (basis_dir[++j] != NULL);

        if (!match_level)
                return -1;

        if (j != best_match) {
                j = best_match;
                pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
                if (link_stat(cmpbuf, &sxp->st, 0) < 0)
                        return -1;
        }

        if (match_level == 3 && !copy_dest) {
#ifdef SUPPORT_HARD_LINKS
                if (link_dest) {
                        if (!hard_link_one(file, fname, cmpbuf, 1))
                                goto try_a_copy;
                        if (preserve_hard_links && F_IS_HLINKED(file))
                                finish_hard_link(file, fname, ndx, &sxp->st, itemizing, code, j);
                        if (!maybe_ATTRS_REPORT && (verbose > 1 || stdout_format_has_i > 1)) {
                                itemize(cmpbuf, file, ndx, 1, sxp,
                                        ITEM_LOCAL_CHANGE | ITEM_XNAME_FOLLOWS,
                                        0, "");
                        }
                } else
#endif
                if (itemizing)
                        itemize(cmpbuf, file, ndx, 0, sxp, 0, 0, NULL);
                if (verbose > 1 && maybe_ATTRS_REPORT)
                        rprintf(FCLIENT, "%s is uptodate\n", fname);
                return -2;
        }

        if (match_level >= 2) {
#ifdef SUPPORT_HARD_LINKS
          try_a_copy: /* Copy the file locally. */
#endif
                if (!dry_run && copy_altdest_file(cmpbuf, fname, file) < 0)
                        return -1;
                if (itemizing)
                        itemize(cmpbuf, file, ndx, 0, sxp, ITEM_LOCAL_CHANGE, 0, NULL);
                if (maybe_ATTRS_REPORT
                 && ((!itemizing && verbose && match_level == 2)
                  || (verbose > 1 && match_level == 3))) {
                        code = match_level == 3 ? FCLIENT : FINFO;
                        rprintf(code, "%s%s\n", fname,
                                match_level == 3 ? " is uptodate" : "");
                }
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_IS_HLINKED(file))
                        finish_hard_link(file, fname, ndx, &sxp->st, itemizing, code, -1);
#endif
                return -2;
        }

        return FNAMECMP_BASIS_DIR_LOW + j;
}

/* This is only called for non-regular files.  We return -2 if we've finished
 * handling the file, or -1 if no dest-linking occurred, or a non-negative
 * value if we found an alternate basis file. */
static int try_dests_non(struct file_struct *file, char *fname, int ndx,
                         char *cmpbuf, stat_x *sxp, int itemizing,
                         enum logcode code)
{
        char lnk[MAXPATHLEN];
        int best_match = -1;
        int match_level = 0;
        enum nonregtype type;
        uint32 *devp;
        int len, j = 0;

#ifndef SUPPORT_LINKS
        if (S_ISLNK(file->mode))
                return -1;
#endif
        if (S_ISDIR(file->mode)) {
                type = TYPE_DIR;
        } else if (IS_SPECIAL(file->mode))
                type = TYPE_SPECIAL;
        else if (IS_DEVICE(file->mode))
                type = TYPE_DEVICE;
#ifdef SUPPORT_LINKS
        else if (S_ISLNK(file->mode))
                type = TYPE_SYMLINK;
#endif
        else {
                rprintf(FERROR,
                        "internal: try_dests_non() called with invalid mode (%o)\n",
                        (int)file->mode);
                exit_cleanup(RERR_UNSUPPORTED);
        }

        do {
                pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
                if (link_stat(cmpbuf, &sxp->st, 0) < 0)
                        continue;
                switch (type) {
                case TYPE_DIR:
                        if (!S_ISDIR(sxp->st.st_mode))
                                continue;
                        break;
                case TYPE_SPECIAL:
                        if (!IS_SPECIAL(sxp->st.st_mode))
                                continue;
                        break;
                case TYPE_DEVICE:
                        if (!IS_DEVICE(sxp->st.st_mode))
                                continue;
                        break;
#ifdef SUPPORT_LINKS
                case TYPE_SYMLINK:
                        if (!S_ISLNK(sxp->st.st_mode))
                                continue;
                        break;
#endif
                }
                if (match_level < 1) {
                        match_level = 1;
                        best_match = j;
                }
                switch (type) {
                case TYPE_DIR:
                        break;
                case TYPE_SPECIAL:
                case TYPE_DEVICE:
                        devp = F_RDEV_P(file);
                        if (sxp->st.st_rdev != MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)))
                                continue;
                        break;
#ifdef SUPPORT_LINKS
                case TYPE_SYMLINK:
                        if ((len = readlink(cmpbuf, lnk, MAXPATHLEN-1)) <= 0)
                                continue;
                        lnk[len] = '\0';
                        if (strcmp(lnk, F_SYMLINK(file)) != 0)
                                continue;
                        break;
#endif
                }
                if (match_level < 2) {
                        match_level = 2;
                        best_match = j;
                }
                if (unchanged_attrs(cmpbuf, file, sxp)) {
                        match_level = 3;
                        best_match = j;
                        break;
                }
        } while (basis_dir[++j] != NULL);

        if (!match_level)
                return -1;

        if (j != best_match) {
                j = best_match;
                pathjoin(cmpbuf, MAXPATHLEN, basis_dir[j], fname);
                if (link_stat(cmpbuf, &sxp->st, 0) < 0)
                        return -1;
        }

        if (match_level == 3) {
#ifdef SUPPORT_HARD_LINKS
                if (link_dest
#ifndef CAN_HARDLINK_SYMLINK
                 && !S_ISLNK(file->mode)
#endif
#ifndef CAN_HARDLINK_SPECIAL
                 && !IS_SPECIAL(file->mode) && !IS_DEVICE(file->mode)
#endif
                 && !S_ISDIR(file->mode)) {
                        if (do_link(cmpbuf, fname) < 0) {
                                rsyserr(FERROR_XFER, errno,
                                        "failed to hard-link %s with %s",
                                        cmpbuf, fname);
                                return j;
                        }
                        if (preserve_hard_links && F_IS_HLINKED(file))
                                finish_hard_link(file, fname, ndx, NULL, itemizing, code, -1);
                } else
#endif
                        match_level = 2;
                if (itemizing && stdout_format_has_i
                 && (verbose > 1 || stdout_format_has_i > 1)) {
                        int chg = compare_dest && type != TYPE_DIR ? 0
                            : ITEM_LOCAL_CHANGE + (match_level == 3 ? ITEM_XNAME_FOLLOWS : 0);
                        char *lp = match_level == 3 ? "" : NULL;
                        itemize(cmpbuf, file, ndx, 0, sxp, chg + ITEM_MATCHED, 0, lp);
                }
                if (verbose > 1 && maybe_ATTRS_REPORT) {
                        rprintf(FCLIENT, "%s%s is uptodate\n",
                                fname, type == TYPE_DIR ? "/" : "");
                }
                return -2;
        }

        return j;
}

static void list_file_entry(struct file_struct *f)
{
        char permbuf[PERMSTRING_SIZE];
        double len;

        if (!F_IS_ACTIVE(f)) {
                /* this can happen if duplicate names were removed */
                return;
        }

        permstring(permbuf, f->mode);
        len = F_LENGTH(f);

        /* TODO: indicate '+' if the entry has an ACL. */

#ifdef SUPPORT_LINKS
        if (preserve_links && S_ISLNK(f->mode)) {
                rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
                        permbuf, len, timestring(f->modtime),
                        f_name(f, NULL), F_SYMLINK(f));
        } else
#endif
        {
                rprintf(FINFO, "%s %11.0f %s %s\n",
                        permbuf, len, timestring(f->modtime),
                        f_name(f, NULL));
        }
}

static int may_tweak(STRUCT_STAT *st)
{
        return tweak_attrs == 2 || (tweak_attrs == 1 && st->st_nlink == 1);
}

static int phase = 0;
static int dflt_perms;

static int implied_dirs_are_missing;
/* Helper for recv_generator's skip_dir and dry_missing_dir tests. */
static BOOL is_below(struct file_struct *file, struct file_struct *subtree)
{
        return F_DEPTH(file) > F_DEPTH(subtree)
                && (!implied_dirs_are_missing || f_name_has_prefix(file, subtree));
}

/* Acts on the indicated item in cur_flist whose name is fname.  If a dir,
 * make sure it exists, and has the right permissions/timestamp info.  For
 * all other non-regular files (symlinks, etc.) we create them here.  For
 * regular files that have changed, we try to find a basis file and then
 * start sending checksums.  The ndx is the file's unique index value.
 *
 * The fname parameter must point to a MAXPATHLEN buffer!  (e.g it gets
 * passed to delete_item(), which can use it during a recursive delete.)
 *
 * Note that f_out is set to -1 when doing final directory-permission and
 * modification-time repair. */
static void recv_generator(char *fname, struct file_struct *file, int ndx,
                           int itemizing, enum logcode code, int f_out)
{
        static const char *parent_dirname = "";
        /* Missing dir not created due to --dry-run; will still be scanned. */
        static struct file_struct *dry_missing_dir = NULL;
        /* Missing dir whose contents are skipped altogether due to
         * --ignore-non-existing, daemon exclude, or mkdir failure. */
        static struct file_struct *skip_dir = NULL;
        static struct file_list *fuzzy_dirlist = NULL;
        static int need_fuzzy_dirlist = 0;
        struct file_struct *fuzzy_file = NULL;
        int fd = -1, f_copy = -1;
        stat_x sx, real_sx;
        STRUCT_STAT partial_st;
        struct file_struct *back_file = NULL;
        int statret, real_ret, stat_errno;
        char *fnamecmp, *partialptr, *backupptr = NULL;
        char fnamecmpbuf[MAXPATHLEN];
        uchar fnamecmp_type;
        int del_opts = delete_mode || force_delete ? DEL_RECURSE : 0;
        int is_dir = !S_ISDIR(file->mode) ? 0
                   : inc_recurse && ndx != cur_flist->ndx_start - 1 ? -1
                   : 1;

        if (verbose > 2)
                rprintf(FINFO, "recv_generator(%s,%d)\n", fname, ndx);

        if (list_only) {
                if (is_dir < 0
                 || (is_dir && !implied_dirs && file->flags & FLAG_IMPLIED_DIR))
                        return;
                list_file_entry(file);
                return;
        }

        if (skip_dir) {
                if (is_below(file, skip_dir)) {
                        if (is_dir)
                                file->flags |= FLAG_MISSING_DIR;
#ifdef SUPPORT_HARD_LINKS
                        else if (F_IS_HLINKED(file))
                                handle_skipped_hlink(file, itemizing, code, f_out);
#endif
                        return;
                }
                skip_dir = NULL;
        }

        if (daemon_filter_list.head) {
                if (check_filter(&daemon_filter_list, fname, is_dir) < 0) {
                        if (is_dir < 0)
                                return;
#ifdef SUPPORT_HARD_LINKS
                        if (F_IS_HLINKED(file))
                                handle_skipped_hlink(file, itemizing, code, f_out);
#endif
                        rprintf(FERROR_XFER,
                                "skipping daemon-excluded %s \"%s\"\n",
                                is_dir ? "directory" : "file", fname);
                        if (is_dir)
                                goto skipping_dir_contents;
                        return;
                }
        }

#ifdef SUPPORT_ACLS
        sx.acc_acl = sx.def_acl = NULL;
#endif
#ifdef SUPPORT_XATTRS
        sx.xattr = NULL;
#endif
        if (dry_run > 1 || (dry_missing_dir && is_below(file, dry_missing_dir))) {
          parent_is_dry_missing:
                if (fuzzy_dirlist) {
                        flist_free(fuzzy_dirlist);
                        fuzzy_dirlist = NULL;
                }
                parent_dirname = "";
                statret = -1;
                stat_errno = ENOENT;
        } else {
                const char *dn = file->dirname ? file->dirname : ".";
                dry_missing_dir = NULL;
                if (parent_dirname != dn && strcmp(parent_dirname, dn) != 0) {
                        if (relative_paths && !implied_dirs
                         && do_stat(dn, &sx.st) < 0) {
                                if (dry_run)
                                        goto parent_is_dry_missing;
                                if (create_directory_path(fname) < 0) {
                                        rsyserr(FERROR_XFER, errno,
                                                "recv_generator: mkdir %s failed",
                                                full_fname(dn));
                                }
                        }
                        if (fuzzy_dirlist) {
                                flist_free(fuzzy_dirlist);
                                fuzzy_dirlist = NULL;
                        }
                        if (fuzzy_basis)
                                need_fuzzy_dirlist = 1;
#ifdef SUPPORT_ACLS
                        if (!preserve_perms)
                                dflt_perms = default_perms_for_dir(dn);
#endif
                }
                parent_dirname = dn;

                if (need_fuzzy_dirlist && S_ISREG(file->mode)) {
                        strlcpy(fnamecmpbuf, dn, sizeof fnamecmpbuf);
                        fuzzy_dirlist = get_dirlist(fnamecmpbuf, -1, 1);
                        need_fuzzy_dirlist = 0;
                }

                statret = link_stat(fname, &sx.st, keep_dirlinks && is_dir);
                stat_errno = errno;
        }

        if (ignore_non_existing > 0 && statret == -1 && stat_errno == ENOENT) {
                if (is_dir) {
                        if (is_dir < 0)
                                return;
                        skip_dir = file;
                        file->flags |= FLAG_MISSING_DIR;
                }
#ifdef SUPPORT_HARD_LINKS
                else if (F_IS_HLINKED(file))
                        handle_skipped_hlink(file, itemizing, code, f_out);
#endif
                if (verbose > 1) {
                        rprintf(FINFO, "not creating new %s \"%s\"\n",
                                is_dir ? "directory" : "file", fname);
                }
                return;
        }

        if (statret == 0 && !(sx.st.st_mode & S_IWUSR)
         && !am_root && sx.st.st_uid == our_uid)
                del_opts |= DEL_NO_UID_WRITE;

        if (ignore_existing > 0 && statret == 0
         && (!is_dir || !S_ISDIR(sx.st.st_mode))) {
                if (verbose > 1 && is_dir >= 0)
                        rprintf(FINFO, "%s exists\n", fname);
#ifdef SUPPORT_HARD_LINKS
                if (F_IS_HLINKED(file))
                        handle_skipped_hlink(file, itemizing, code, f_out);
#endif
                goto cleanup;
        }

        if (is_dir) {
                if (!implied_dirs && file->flags & FLAG_IMPLIED_DIR)
                        goto cleanup;
                if (is_dir < 0) {
                        /* In inc_recurse mode we want to make sure any missing
                         * directories get created while we're still processing
                         * the parent dir (which allows us to touch the parent
                         * dir's mtime right away).  We will handle the dir in
                         * full later (right before we handle its contents). */
                        if (statret == 0
                         && (S_ISDIR(sx.st.st_mode)
                          || delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_DIR) != 0))
                                goto cleanup; /* Any errors get reported later. */
                        if (do_mkdir(fname, file->mode & 0700) == 0)
                                file->flags |= FLAG_DIR_CREATED;
                        goto cleanup;
                }
                /* The file to be received is a directory, so we need
                 * to prepare appropriately.  If there is already a
                 * file of that name and it is *not* a directory, then
                 * we need to delete it.  If it doesn't exist, then
                 * (perhaps recursively) create it. */
                if (statret == 0 && !S_ISDIR(sx.st.st_mode)) {
                        if (delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_DIR) != 0)
                                goto skipping_dir_contents;
                        statret = -1;
                }
                if (dry_run && statret != 0) {
                        if (!dry_missing_dir)
                                dry_missing_dir = file;
                        file->flags |= FLAG_MISSING_DIR;
                }
                real_ret = statret;
                real_sx = sx;
                if (file->flags & FLAG_DIR_CREATED)
                        statret = -1;
                if (!preserve_perms) { /* See comment in non-dir code below. */
                        file->mode = dest_mode(file->mode, sx.st.st_mode,
                                               dflt_perms, statret == 0);
                }
                if (statret != 0 && basis_dir[0] != NULL) {
                        int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &sx,
                                              itemizing, code);
                        if (j == -2) {
                                itemizing = 0;
                                code = FNONE;
                        } else if (j >= 0)
                                statret = 1;
                }
                if (itemizing && f_out != -1) {
                        itemize(fname, file, ndx, statret, &sx,
                                statret ? ITEM_LOCAL_CHANGE : 0, 0, NULL);
                }
                if (real_ret != 0 && do_mkdir(fname,file->mode) < 0 && errno != EEXIST) {
                        if (!relative_paths || errno != ENOENT
                            || create_directory_path(fname) < 0
                            || (do_mkdir(fname, file->mode) < 0 && errno != EEXIST)) {
                                rsyserr(FERROR_XFER, errno,
                                        "recv_generator: mkdir %s failed",
                                        full_fname(fname));
                          skipping_dir_contents:
                                rprintf(FERROR,
                                    "*** Skipping any contents from this failed directory ***\n");
                                skip_dir = file;
                                file->flags |= FLAG_MISSING_DIR;
                                goto cleanup;
                        }
                }
                if (set_file_attrs(fname, file, real_ret ? NULL : &real_sx, NULL, 0)
                    && verbose && code != FNONE && f_out != -1)
                        rprintf(code, "%s/\n", fname);

                /* We need to ensure that the dirs in the transfer have writable
                 * permissions during the time we are putting files within them.
                 * This is then fixed after the transfer is done. */
#ifdef HAVE_CHMOD
                if (!am_root && !(file->mode & S_IWUSR) && dir_tweaking) {
                        mode_t mode = file->mode | S_IWUSR;
                        if (do_chmod(fname, mode) < 0) {
                                rsyserr(FERROR_XFER, errno,
                                        "failed to modify permissions on %s",
                                        full_fname(fname));
                        }
                        need_retouch_dir_perms = 1;
                }
#endif

                if (real_ret != 0 && one_file_system)
                        real_sx.st.st_dev = filesystem_dev;
                if (inc_recurse) {
                        if (one_file_system) {
                                uint32 *devp = F_DIR_DEV_P(file);
                                DEV_MAJOR(devp) = major(real_sx.st.st_dev);
                                DEV_MINOR(devp) = minor(real_sx.st.st_dev);
                        }
                }
                else if (delete_during && f_out != -1 && !phase
                    && BITS_SETnUNSET(file->flags, FLAG_CONTENT_DIR, FLAG_MISSING_DIR))
                        delete_in_dir(fname, file, &real_sx.st.st_dev);
                goto cleanup;
        }

        /* If we're not preserving permissions, change the file-list's
         * mode based on the local permissions and some heuristics. */
        if (!preserve_perms) {
                int exists = statret == 0 && !S_ISDIR(sx.st.st_mode);
                file->mode = dest_mode(file->mode, sx.st.st_mode, dflt_perms,
                                       exists);
        }

#ifdef SUPPORT_HARD_LINKS
        if (preserve_hard_links && F_HLINK_NOT_FIRST(file)
         && hard_link_check(file, ndx, fname, statret, &sx, itemizing, code))
                goto cleanup;
#endif

        if (preserve_links && S_ISLNK(file->mode)) {
#ifdef SUPPORT_LINKS
                int iflags = 0;
                const char *sl = F_SYMLINK(file);
                if (safe_symlinks && unsafe_symlink(sl, fname)) {
                        if (verbose) {
                                if (solo_file)
                                        fname = f_name(file, NULL);
                                rprintf(FINFO,
                                        "ignoring unsafe symlink %s -> \"%s\"\n",
                                        full_fname(fname), sl);
                        }
                        return;
                }
                if (statret == 0) {
                        char lnk[MAXPATHLEN];
                        int len;

                        if (!S_ISLNK(sx.st.st_mode))
                                statret = -1;
                        else if ((len = readlink(fname, lnk, MAXPATHLEN-1)) > 0
                              && strncmp(lnk, sl, len) == 0 && sl[len] == '\0') {
                                /* The link is pointing to the right place. */
                                if (may_tweak(&sx.st)) {
                                        if (verbose > 2)
                                                rprintf(FINFO, "possibly tweaking attributes of %s\n", fname);
                                        set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
                                } else if (!unchanged_attrs(fname, file, &sx)) {
                                        if (verbose > 2)
                                                rprintf(FINFO, "recreating %s due to changed attributes\n", fname);
                                        goto recreate_symlink;
                                }
                                if (itemizing)
                                        itemize(fname, file, ndx, 0, &sx, 0, 0, NULL);
#if defined SUPPORT_HARD_LINKS && defined CAN_HARDLINK_SYMLINK
                                if (preserve_hard_links && F_IS_HLINKED(file))
                                        finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
#endif
                                if (remove_source_files == 1)
                                        goto return_with_success;
                                goto cleanup;
                        } else
                                iflags = ITEM_REPORT_CHANGE;
                  recreate_symlink:
                        /* Not the right symlink (or not a symlink), so
                         * delete it. */
                        if (delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_SYMLINK) != 0)
                                goto cleanup;
                } else if (basis_dir[0] != NULL) {
                        int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &sx,
                                              itemizing, code);
                        if (j == -2) {
#ifndef CAN_HARDLINK_SYMLINK
                                if (link_dest) {
                                        /* Resort to --copy-dest behavior. */
                                } else
#endif
                                if (!copy_dest)
                                        goto cleanup;
                                itemizing = 0;
                                code = FNONE;
                        } else if (j >= 0)
                                statret = 1;
                }
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
                        cur_flist->in_progress++;
                        goto cleanup;
                }
#endif
                if (do_symlink(sl, fname) != 0) {
                        rsyserr(FERROR_XFER, errno, "symlink %s -> \"%s\" failed",
                                full_fname(fname), sl);
                } else {
                        set_file_attrs(fname, file, NULL, NULL, 0);
                        if (itemizing) {
                                itemize(fname, file, ndx, statret, &sx,
                                        ITEM_LOCAL_CHANGE|iflags, 0, NULL);
                        }
                        if ((iflags & ITEM_REPORT_CHANGE) && code != FNONE && verbose)
                                rprintf(code, "%s -> %s\n", fname, sl);
#ifdef SUPPORT_HARD_LINKS
                        if (preserve_hard_links && F_IS_HLINKED(file))
                                finish_hard_link(file, fname, ndx, NULL, itemizing, code, -1);
#endif
                        /* When the symlink value changed, we do not check
                         * remove_source_files == 1 because this is one of the
                         * items that the old --remove-sent-files option would
                         * remove. */
                        if ((iflags & ITEM_REPORT_CHANGE) ? remove_source_files
                              : remove_source_files == 1)
                                goto return_with_success;
                }
#endif
                goto cleanup;
        }

        if ((am_root && preserve_devices && IS_DEVICE(file->mode))
         || (preserve_specials && IS_SPECIAL(file->mode))) {
                int iflags = 0;
                uint32 *devp = F_RDEV_P(file);
                dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
                if (statret == 0) {
                        int del_for_flag;
                        if (IS_DEVICE(file->mode)) {
                                if (!IS_DEVICE(sx.st.st_mode))
                                        statret = -1;
                                del_for_flag = DEL_FOR_DEVICE;
                        } else {
                                if (!IS_SPECIAL(sx.st.st_mode))
                                        statret = -1;
                                del_for_flag = DEL_FOR_SPECIAL;
                        }
                        if (statret == 0
                         && BITS_EQUAL(sx.st.st_mode, file->mode, _S_IFMT)
                         && sx.st.st_rdev == rdev) {
                                /* The device or special file is identical. */
                                if (may_tweak(&sx.st)) {
                                        if (verbose > 2)
                                                rprintf(FINFO, "possibly tweaking attributes of %s\n", fname);
                                        set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
                                } else if (!unchanged_attrs(fname, file, &sx)) {
                                        if (verbose > 2)
                                                rprintf(FINFO, "recreating %s due to changed attributes\n", fname);
                                        goto recreate_D;
                                }
                                if (itemizing)
                                        itemize(fname, file, ndx, 0, &sx, 0, 0, NULL);
#ifdef SUPPORT_HARD_LINKS
                                if (preserve_hard_links && F_IS_HLINKED(file))
                                        finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
#endif
                                if (remove_source_files == 1)
                                        goto return_with_success;
                                goto cleanup;
                        } else
                                iflags = ITEM_REPORT_CHANGE;
                  recreate_D:
                        if (delete_item(fname, sx.st.st_mode, del_opts | del_for_flag) != 0)
                                goto cleanup;
                } else if (basis_dir[0] != NULL) {
                        int j = try_dests_non(file, fname, ndx, fnamecmpbuf, &sx,
                                              itemizing, code);
                        if (j == -2) {
#ifndef CAN_HARDLINK_SPECIAL
                                if (link_dest) {
                                        /* Resort to --copy-dest behavior. */
                                } else
#endif
                                if (!copy_dest)
                                        goto cleanup;
                                itemizing = 0;
                                code = FNONE;
                        } else if (j >= 0)
                                statret = 1;
                }
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
                        cur_flist->in_progress++;
                        goto cleanup;
                }
#endif
                if (verbose > 2) {
                        rprintf(FINFO, "mknod(%s, 0%o, [%ld,%ld])\n",
                                fname, (int)file->mode,
                                (long)major(rdev), (long)minor(rdev));
                }
                if (do_mknod(fname, file->mode, rdev) < 0) {
                        rsyserr(FERROR_XFER, errno, "mknod %s failed",
                                full_fname(fname));
                } else {
                        set_file_attrs(fname, file, NULL, NULL, 0);
                        if (itemizing) {
                                itemize(fname, file, ndx, statret, &sx,
                                        ITEM_LOCAL_CHANGE|iflags, 0, NULL);
                        }
                        if ((iflags & ITEM_REPORT_CHANGE) && code != FNONE && verbose)
                                rprintf(code, "%s\n", fname);
#ifdef SUPPORT_HARD_LINKS
                        if (preserve_hard_links && F_IS_HLINKED(file))
                                finish_hard_link(file, fname, ndx, NULL, itemizing, code, -1);
#endif
                        if (remove_source_files == 1)
                                goto return_with_success;
                }
                goto cleanup;
        }

        if (!S_ISREG(file->mode)) {
                if (solo_file)
                        fname = f_name(file, NULL);
                rprintf(FINFO, "skipping non-regular file \"%s\"\n", fname);
                goto cleanup;
        }

        if (max_size > 0 && F_LENGTH(file) > max_size) {
                if (verbose > 1) {
                        if (solo_file)
                                fname = f_name(file, NULL);
                        rprintf(FINFO, "%s is over max-size\n", fname);
                }
                goto cleanup;
        }
        if (min_size > 0 && F_LENGTH(file) < min_size) {
                if (verbose > 1) {
                        if (solo_file)
                                fname = f_name(file, NULL);
                        rprintf(FINFO, "%s is under min-size\n", fname);
                }
                goto cleanup;
        }

        if (update_only > 0 && statret == 0
            && cmp_time(sx.st.st_mtime, file->modtime) > 0) {
                if (verbose > 1)
                        rprintf(FINFO, "%s is newer\n", fname);
#ifdef SUPPORT_HARD_LINKS
                if (F_IS_HLINKED(file))
                        handle_skipped_hlink(file, itemizing, code, f_out);
#endif
                goto cleanup;
        }

        fnamecmp = fname;
        fnamecmp_type = FNAMECMP_FNAME;

        if (statret == 0 && !S_ISREG(sx.st.st_mode)) {
                if (delete_item(fname, sx.st.st_mode, del_opts | DEL_FOR_FILE) != 0)
                        goto cleanup;
                statret = -1;
                stat_errno = ENOENT;
        }

        if (statret != 0 && basis_dir[0] != NULL) {
                int j = try_dests_reg(file, fname, ndx, fnamecmpbuf, &sx,
                                      itemizing, code);
                if (j == -2) {
                        if (remove_source_files == 1)
                                goto return_with_success;
                        goto cleanup;
                }
                if (j >= 0) {
                        fnamecmp = fnamecmpbuf;
                        fnamecmp_type = j;
                        statret = 0;
                }
        }

        real_ret = statret;
        real_sx = sx;

        if (partial_dir && (partialptr = partial_dir_fname(fname)) != NULL
            && link_stat(partialptr, &partial_st, 0) == 0
            && S_ISREG(partial_st.st_mode)) {
                if (statret != 0)
                        goto prepare_to_open;
        } else
                partialptr = NULL;

        if (statret != 0 && fuzzy_dirlist) {
                int j = find_fuzzy(file, fuzzy_dirlist);
                if (j >= 0) {
                        fuzzy_file = fuzzy_dirlist->files[j];
                        f_name(fuzzy_file, fnamecmpbuf);
                        if (verbose > 2) {
                                rprintf(FINFO, "fuzzy basis selected for %s: %s\n",
                                        fname, fnamecmpbuf);
                        }
                        sx.st.st_size = F_LENGTH(fuzzy_file);
                        statret = 0;
                        fnamecmp = fnamecmpbuf;
                        fnamecmp_type = FNAMECMP_FUZZY;
                }
        }

        if (statret != 0) {
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
                        cur_flist->in_progress++;
                        goto cleanup;
                }
#endif
                if (stat_errno == ENOENT)
                        goto notify_others;
                rsyserr(FERROR_XFER, stat_errno, "recv_generator: failed to stat %s",
                        full_fname(fname));
                goto cleanup;
        }

        if (fnamecmp_type <= FNAMECMP_BASIS_DIR_HIGH)
                ;
        else if (fnamecmp_type == FNAMECMP_FUZZY)
                ;
        else if (unchanged_file(fnamecmp, file, &sx.st)) {
                /* fnamecmp == fname, fnamecmp_type == FNAMECMP_FNAME */
                int iflags = 0;

                if (partialptr) {
                        do_unlink(partialptr);
                        handle_partial_dir(partialptr, PDIR_DELETE);
                }
                if (may_tweak(&sx.st)) {
                        /* Currently, we call set_file_attrs on all tweakable
                         * files, though ideally it would have no effect when
                         * unchanged_attrs returns true. */
                        if (verbose > 2)
                                rprintf(FINFO, "possibly tweaking attributes of %s\n", fname);
                        set_file_attrs(fname, file, &sx, NULL, maybe_ATTRS_REPORT);
                } else if (!unchanged_attrs(fname, file, &sx)) {
                        /* Need to recreate the file.
                         * copy_altdest_file sets its attributes, etc. */
                        if (verbose > 2)
                                rprintf(FINFO, "recreating %s due to changed attributes\n", fname);
                        if (!dry_run && copy_altdest_file(fnamecmp, fname, file))
                                goto cleanup;
                        iflags |= ITEM_LOCAL_CHANGE;
                }
                if (itemizing)
                        itemize(fnamecmp, file, ndx, statret, &sx, iflags, 0, NULL);
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_IS_HLINKED(file))
                        finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
#endif
                if (remove_source_files != 1)
                        goto cleanup;
          return_with_success:
                if (!dry_run)
                        send_msg_int(MSG_SUCCESS, ndx);
                goto cleanup;
        }

        if (append_mode > 0 && sx.st.st_size >= F_LENGTH(file)) {
#ifdef SUPPORT_HARD_LINKS
                if (F_IS_HLINKED(file))
                        handle_skipped_hlink(file, itemizing, code, f_out);
#endif
                goto cleanup;
        }

  prepare_to_open:
        if (partialptr) {
                sx.st = partial_st;
                fnamecmp = partialptr;
                fnamecmp_type = FNAMECMP_PARTIAL_DIR;
                statret = 0;
        }

        if (!do_xfers)
                goto notify_others;

        if (read_batch || whole_file) {
                if (inplace && make_backups > 0 && fnamecmp_type == FNAMECMP_FNAME) {
                        if (!(backupptr = get_backup_name(fname)))
                                goto cleanup;
                        if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
                                goto pretend_missing;
                        if (copy_file(fname, backupptr, -1, back_file->mode, 1) < 0) {
                                unmake_file(back_file);
                                back_file = NULL;
                                goto cleanup;
                        }
                }
                goto notify_others;
        }

        if (fuzzy_dirlist) {
                int j = flist_find(fuzzy_dirlist, file);
                if (j >= 0) /* don't use changing file as future fuzzy basis */
                        fuzzy_dirlist->files[j]->flags |= FLAG_FILE_SENT;
        }

        /* open the file */
        if ((fd = do_open(fnamecmp, O_RDONLY, 0)) < 0) {
                rsyserr(FERROR, errno, "failed to open %s, continuing",
                        full_fname(fnamecmp));
          pretend_missing:
                /* pretend the file didn't exist */
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_HLINK_NOT_LAST(file)) {
                        cur_flist->in_progress++;
                        goto cleanup;
                }
#endif
                statret = real_ret = -1;
                goto notify_others;
        }

        if (inplace && make_backups > 0 && fnamecmp_type == FNAMECMP_FNAME) {
                if (!(backupptr = get_backup_name(fname))) {
                        close(fd);
                        goto cleanup;
                }
                if (!(back_file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) {
                        close(fd);
                        goto pretend_missing;
                }
                if (robust_unlink(backupptr) && errno != ENOENT) {
                        rsyserr(FERROR_XFER, errno, "unlink %s",
                                full_fname(backupptr));
                        unmake_file(back_file);
                        back_file = NULL;
                        close(fd);
                        goto cleanup;
                }
                if ((f_copy = do_open(backupptr, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0
                 && (errno != ENOENT || make_bak_dir(backupptr) < 0
                  || (f_copy = do_open(backupptr, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0)) {
                        rsyserr(FERROR_XFER, errno, "open %s",
                                full_fname(backupptr));
                        unmake_file(back_file);
                        back_file = NULL;
                        close(fd);
                        goto cleanup;
                }
                fnamecmp_type = FNAMECMP_BACKUP;
        }

        if (verbose > 3) {
                rprintf(FINFO, "gen mapped %s of size %.0f\n",
                        fnamecmp, (double)sx.st.st_size);
        }

        if (verbose > 2)
                rprintf(FINFO, "generating and sending sums for %d\n", ndx);

  notify_others:
        if (remove_source_files && !delay_updates && !phase && !dry_run)
                increment_active_files(ndx, itemizing, code);
        if (inc_recurse && !dry_run)
                cur_flist->in_progress++;
#ifdef SUPPORT_HARD_LINKS
        if (preserve_hard_links && F_IS_HLINKED(file))
                file->flags |= FLAG_FILE_SENT;
#endif
        write_ndx(f_out, ndx);
        if (itemizing) {
                int iflags = ITEM_TRANSFER;
                if (always_checksum > 0)
                        iflags |= ITEM_REPORT_CHANGE;
                if (fnamecmp_type != FNAMECMP_FNAME)
                        iflags |= ITEM_BASIS_TYPE_FOLLOWS;
                if (fnamecmp_type == FNAMECMP_FUZZY)
                        iflags |= ITEM_XNAME_FOLLOWS;
                itemize(fnamecmp, file, -1, real_ret, &real_sx, iflags, fnamecmp_type,
                        fuzzy_file ? fuzzy_file->basename : NULL);
#ifdef SUPPORT_ACLS
                if (preserve_acls)
                        free_acl(&real_sx);
#endif
#ifdef SUPPORT_XATTRS
                if (preserve_xattrs)
                        free_xattr(&real_sx);
#endif
        }

        if (!do_xfers) {
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && F_IS_HLINKED(file))
                        finish_hard_link(file, fname, ndx, &sx.st, itemizing, code, -1);
#endif
                goto cleanup;
        }
        if (read_batch)
                goto cleanup;

        if (statret != 0 || whole_file)
                write_sum_head(f_out, NULL);
        else {
                generate_and_send_sums(fd, sx.st.st_size, f_out, f_copy);
                close(fd);
        }

  cleanup:
        if (back_file) {
                if (f_copy >= 0)
                        close(f_copy);
                set_file_attrs(backupptr, back_file, NULL, NULL, 0);
                if (verbose > 1) {
                        rprintf(FINFO, "backed up %s to %s\n",
                                fname, backupptr);
                }
                unmake_file(back_file);
        }

#ifdef SUPPORT_ACLS
        if (preserve_acls)
                free_acl(&sx);
#endif
#ifdef SUPPORT_XATTRS
        if (preserve_xattrs)
                free_xattr(&sx);
#endif
        return;
}

#ifdef SUPPORT_HARD_LINKS
static void handle_skipped_hlink(struct file_struct *file, int itemizing,
                                 enum logcode code, int f_out)
{
        char fbuf[MAXPATHLEN];
        int new_last_ndx;
        struct file_list *save_flist = cur_flist;

        /* If we skip the last item in a chain of links and there was a
         * prior non-skipped hard-link waiting to finish, finish it now. */
        if ((new_last_ndx = skip_hard_link(file, &cur_flist)) < 0)
                return;

        file = cur_flist->files[new_last_ndx - cur_flist->ndx_start];
        cur_flist->in_progress--; /* undo prior increment */
        f_name(file, fbuf);
        recv_generator(fbuf, file, new_last_ndx, itemizing, code, f_out);

        cur_flist = save_flist;
}
#endif

static void touch_up_dirs(struct file_list *flist, int ndx)
{
        static int counter = 0;
        struct file_struct *file;
        char *fname;
        int i, start, end;

        if (ndx < 0) {
                start = 0;
                end = flist->used - 1;
        } else
                start = end = ndx;

        /* Fix any directory permissions that were modified during the
         * transfer and/or re-set any tweaked modified-time values. */
        for (i = start; i <= end; i++, counter++) {
                file = flist->files[i];
                if (!S_ISDIR(file->mode)
                 || (!implied_dirs && file->flags & FLAG_IMPLIED_DIR))
                        continue;
                if (verbose > 3) {
                        fname = f_name(file, NULL);
                        rprintf(FINFO, "touch_up_dirs: %s (%d)\n",
                                NS(fname), i);
                }
                if (!F_IS_ACTIVE(file) || file->flags & FLAG_MISSING_DIR
                 || (!need_retouch_dir_times && file->mode & S_IWUSR))
                        continue;
                fname = f_name(file, NULL);
                if (!(file->mode & S_IWUSR))
                        do_chmod(fname, file->mode);
                if (need_retouch_dir_times) {
                        STRUCT_STAT st;
                        if (link_stat(fname, &st, 0) == 0
                         && cmp_time(st.st_mtime, file->modtime) != 0)
                                set_modtime(fname, file->modtime, file->mode);
                }
                if (allowed_lull && !(counter % lull_mod))
                        maybe_send_keepalive();
                else if (!(counter & 0xFF))
                        maybe_flush_socket(0);
        }
}

void check_for_finished_files(int itemizing, enum logcode code, int check_redo)
{
        struct file_struct *file;
        struct file_list *flist;
        char fbuf[MAXPATHLEN];
        int ndx;

        while (1) {
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && (ndx = get_hlink_num()) != -1) {
                        flist = flist_for_ndx(ndx);
                        assert(flist != NULL);
                        file = flist->files[ndx - flist->ndx_start];
                        assert(file->flags & FLAG_HLINKED);
                        finish_hard_link(file, f_name(file, fbuf), ndx, NULL, itemizing, code, -1);
                        flist->in_progress--;
                        continue;
                }
#endif

                if (check_redo && (ndx = get_redo_num()) != -1) {
                        csum_length = SUM_LENGTH;
                        max_size = -max_size;
                        min_size = -min_size;
                        ignore_existing = -ignore_existing;
                        ignore_non_existing = -ignore_non_existing;
                        update_only = -update_only;
                        always_checksum = -always_checksum;
                        size_only = -size_only;
                        append_mode = -append_mode;
                        make_backups = -make_backups; /* avoid dup backup w/inplace */
                        ignore_times++;

                        flist = cur_flist;
                        cur_flist = flist_for_ndx(ndx);

                        file = cur_flist->files[ndx - cur_flist->ndx_start];
                        if (solo_file)
                                strlcpy(fbuf, solo_file, sizeof fbuf);
                        else
                                f_name(file, fbuf);
                        recv_generator(fbuf, file, ndx, itemizing, code, sock_f_out);
                        cur_flist->to_redo--;

                        cur_flist = flist;

                        csum_length = SHORT_SUM_LENGTH;
                        max_size = -max_size;
                        min_size = -min_size;
                        ignore_existing = -ignore_existing;
                        ignore_non_existing = -ignore_non_existing;
                        update_only = -update_only;
                        always_checksum = -always_checksum;
                        size_only = -size_only;
                        append_mode = -append_mode;
                        make_backups = -make_backups;
                        ignore_times--;
                        continue;
                }

                if (cur_flist == first_flist)
                        break;

                /* We only get here if inc_recurse is enabled. */
                if (first_flist->in_progress || first_flist->to_redo)
                        break;

                if (!read_batch) {
                        write_ndx(sock_f_out, NDX_DONE);
                        maybe_flush_socket(1);
                }

                if (delete_during == 2 || !dir_tweaking) {
                        /* Skip directory touch-up. */
                } else if (first_flist->parent_ndx >= 0)
                        touch_up_dirs(dir_flist, first_flist->parent_ndx);

                flist_free(first_flist); /* updates first_flist */
        }
}

void generate_files(int f_out, const char *local_name)
{
        int i, ndx;
        char fbuf[MAXPATHLEN];
        int itemizing;
        enum logcode code;
        int save_do_progress = do_progress;

        if (protocol_version >= 29) {
                itemizing = 1;
                maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
                code = logfile_format_has_i ? FNONE : FLOG;
        } else if (am_daemon) {
                itemizing = logfile_format_has_i && do_xfers;
                maybe_ATTRS_REPORT = ATTRS_REPORT;
                code = itemizing || !do_xfers ? FCLIENT : FINFO;
        } else if (!am_server) {
                itemizing = stdout_format_has_i;
                maybe_ATTRS_REPORT = stdout_format_has_i ? 0 : ATTRS_REPORT;
                code = itemizing ? FNONE : FINFO;
        } else {
                itemizing = 0;
                maybe_ATTRS_REPORT = ATTRS_REPORT;
                code = FINFO;
        }
        solo_file = local_name;
        dir_tweaking = !(list_only || solo_file || dry_run);
        need_retouch_dir_times = preserve_times > 1;
        lull_mod = allowed_lull * 5;
        symlink_timeset_failed_flags = ITEM_REPORT_TIME
            | (protocol_version >= 30 || !am_server ? ITEM_REPORT_TIMEFAIL : 0);
        implied_dirs_are_missing = relative_paths && !implied_dirs && protocol_version < 30;

        if (verbose > 2)
                rprintf(FINFO, "generator starting pid=%ld\n", (long)getpid());

        if (delete_before && !solo_file && cur_flist->used > 0)
                do_delete_pass();
        if (delete_during == 2) {
                deldelay_size = BIGPATHBUFLEN * 4;
                deldelay_buf = new_array(char, deldelay_size);
                if (!deldelay_buf)
                        out_of_memory("delete-delay");
        }
        do_progress = 0;

        if (append_mode > 0 || whole_file < 0)
                whole_file = 0;
        if (verbose >= 2) {
                rprintf(FINFO, "delta-transmission %s\n",
                        whole_file
                        ? "disabled for local transfer or --whole-file"
                        : "enabled");
        }

        /* Since we often fill up the outgoing socket and then just sit around
         * waiting for the other 2 processes to do their thing, we don't want
         * to exit on a timeout.  If the data stops flowing, the receiver will
         * notice that and let us know via the redo pipe (or its closing). */
        ignore_timeout = 1;

        dflt_perms = (ACCESSPERMS & ~orig_umask);

        do {
#ifdef SUPPORT_HARD_LINKS
                if (preserve_hard_links && inc_recurse) {
                        while (!flist_eof && file_total < FILECNT_LOOKAHEAD/2)
                                wait_for_receiver();
                }
#endif

                if (inc_recurse && cur_flist->parent_ndx >= 0) {
                        struct file_struct *fp = dir_flist->files[cur_flist->parent_ndx];
                        f_name(fp, fbuf);
                        ndx = cur_flist->ndx_start - 1;
                        recv_generator(fbuf, fp, ndx, itemizing, code, f_out);
                        if (delete_during && dry_run < 2 && !list_only) {
                                if (BITS_SETnUNSET(fp->flags, FLAG_CONTENT_DIR, FLAG_MISSING_DIR)) {
                                        dev_t dirdev;
                                        if (one_file_system) {
                                                uint32 *devp = F_DIR_DEV_P(fp);
                                                dirdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
                                        } else
                                                dirdev = MAKEDEV(0, 0);
                                        delete_in_dir(f_name(fp, fbuf), fp, &dirdev);
                                }
                        }
                }
                for (i = cur_flist->low; i <= cur_flist->high; i++) {
                        struct file_struct *file = cur_flist->sorted[i];

                        if (!F_IS_ACTIVE(file))
                                continue;

                        if (unsort_ndx)
                                ndx = F_NDX(file);
                        else
                                ndx = i + cur_flist->ndx_start;

                        if (solo_file)
                                strlcpy(fbuf, solo_file, sizeof fbuf);
                        else
                                f_name(file, fbuf);
                        recv_generator(fbuf, file, ndx, itemizing, code, f_out);

                        check_for_finished_files(itemizing, code, 0);

                        if (allowed_lull && !(i % lull_mod))
                                maybe_send_keepalive();
                        else if (!(i & 0xFF))
                                maybe_flush_socket(0);
                }

                if (!inc_recurse) {
                        write_ndx(f_out, NDX_DONE);
                        break;
                }

                while (1) {
                        check_for_finished_files(itemizing, code, 1);
                        if (cur_flist->next || flist_eof)
                                break;
                        wait_for_receiver();
                }
        } while ((cur_flist = cur_flist->next) != NULL);

        if (delete_during)
                delete_in_dir(NULL, NULL, &dev_zero);
        phase++;
        if (verbose > 2)
                rprintf(FINFO, "generate_files phase=%d\n", phase);

        while (1) {
                check_for_finished_files(itemizing, code, 1);
                if (msgdone_cnt)
                        break;
                wait_for_receiver();
        }

        phase++;
        if (verbose > 2)
                rprintf(FINFO, "generate_files phase=%d\n", phase);

        write_ndx(f_out, NDX_DONE);
        /* Reduce round-trip lag-time for a useless delay-updates phase. */
        if (protocol_version >= 29 && !delay_updates)
                write_ndx(f_out, NDX_DONE);

        /* Read MSG_DONE for the redo phase (and any prior messages). */
        while (1) {
                check_for_finished_files(itemizing, code, 0);
                if (msgdone_cnt > 1)
                        break;
                wait_for_receiver();
        }

        if (protocol_version >= 29) {
                phase++;
                if (verbose > 2)
                        rprintf(FINFO, "generate_files phase=%d\n", phase);
                if (delay_updates)
                        write_ndx(f_out, NDX_DONE);
                /* Read MSG_DONE for delay-updates phase & prior messages. */
                while (msgdone_cnt == 2)
                        wait_for_receiver();
        }

        do_progress = save_do_progress;
        if (delete_during == 2)
                do_delayed_deletions(fbuf);
        if (delete_after && !solo_file && file_total > 0)
                do_delete_pass();

        if ((need_retouch_dir_perms || need_retouch_dir_times)
         && dir_tweaking && (!inc_recurse || delete_during == 2))
                touch_up_dirs(dir_flist, -1);

        if (max_delete >= 0 && deletion_count > max_delete) {
                rprintf(FINFO,
                        "Deletions stopped due to --max-delete limit (%d skipped)\n",
                        deletion_count - max_delete);
                io_error |= IOERR_DEL_LIMIT;
        }

        if (verbose > 2)
                rprintf(FINFO, "generate_files finished\n");
}