/*
- Copyright (C) Andrew Tridgell 1999
-
- 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 2 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-/* backup handling code */
+ * Backup handling code.
+ *
+ * Copyright (C) 1999 Andrew Tridgell
+ * Copyright (C) 2003, 2004, 2005, 2006 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
#include "rsync.h"
extern int verbose;
-extern int backup_suffix_len;
extern int backup_dir_len;
+extern unsigned int backup_dir_remainder;
+extern char backup_dir_buf[MAXPATHLEN];
extern char *backup_suffix;
extern char *backup_dir;
extern int am_root;
extern int preserve_devices;
+extern int preserve_specials;
extern int preserve_links;
-extern int preserve_hard_links;
-extern int orig_umask;
+extern int safe_symlinks;
-/* simple backup creates a backup with a suffix in the same directory */
-static int make_simple_backup(char *fname)
+/* make a complete pathname for backup file */
+char *get_backup_name(char *fname)
{
- char fnamebak[MAXPATHLEN];
-
- if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL)
- >= sizeof fnamebak) {
- rprintf(FERROR, "backup filename too long\n");
- return 0;
+ if (backup_dir) {
+ if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
+ fname, backup_suffix, NULL) < backup_dir_remainder)
+ return backup_dir_buf;
+ } else {
+ if (stringjoin(backup_dir_buf, MAXPATHLEN,
+ fname, backup_suffix, NULL) < MAXPATHLEN)
+ return backup_dir_buf;
}
- if (do_rename(fname, fnamebak) != 0) {
- /* cygwin (at least version b19) reports EINVAL */
- if (errno != ENOENT && errno != EINVAL) {
- rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak);
- return 0;
- }
- } else if (verbose > 1) {
- rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak);
- }
- return 1;
+ rprintf(FERROR, "backup filename too long\n");
+ return NULL;
}
-
-/* recursively make a directory path */
-static int make_dir(char *name, int mask)
+/* simple backup creates a backup with a suffix in the same directory */
+static int make_simple_backup(char *fname)
{
- char newdir [MAXPATHLEN];
- char *p, *d;
-
- /* copy pathname over, look for last '/' */
- for (p = d = newdir; *name; *d++ = *name++)
- if (*name == '/')
- p = d;
- if (p == newdir)
+ int rename_errno;
+ char *fnamebak = get_backup_name(fname);
+
+ if (!fnamebak)
return 0;
- *p = 0;
- /* make the new directory, if that fails then make its parent */
- while (do_mkdir(newdir, mask) != 0) {
- if (errno != ENOENT || !make_dir(newdir, mask))
- return 0;
+ while (1) {
+ if (do_rename(fname, fnamebak) == 0) {
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ fname, fnamebak);
+ }
+ break;
+ }
+ /* cygwin (at least version b19) reports EINVAL */
+ if (errno == ENOENT || errno == EINVAL)
+ break;
+
+ rename_errno = errno;
+ if (errno == EISDIR && do_rmdir(fnamebak) == 0)
+ continue;
+ if (errno == ENOTDIR && do_unlink(fnamebak) == 0)
+ continue;
+
+ rsyserr(FERROR, rename_errno, "rename %s to backup %s",
+ fname, fnamebak);
+ errno = rename_errno;
+ return 0;
}
return 1;
-} /* make_dir */
+}
/****************************************************************************
Create a directory given an absolute path, perms based upon another directory
path
****************************************************************************/
-static int make_bak_dir(char *fname, char *bak_path)
+static int make_bak_dir(char *fullpath)
{
STRUCT_STAT st;
- STRUCT_STAT *st2;
- char fullpath[MAXPATHLEN];
- char *p;
- char *q;
-
- while(strncmp(bak_path, "./", 2) == 0) bak_path += 2;
-
- if (pathjoin(fullpath, sizeof fullpath, bak_path, fname)
- >= sizeof fullpath) {
- rprintf(FERROR, "backup dirname too long\n");
- return 0;
+ char *rel = fullpath + backup_dir_len;
+ char *end = rel + strlen(rel);
+ char *p = end;
+
+ while (strncmp(fullpath, "./", 2) == 0)
+ fullpath += 2;
+
+ /* Try to find an existing dir, starting from the deepest dir. */
+ while (1) {
+ if (--p == fullpath) {
+ p += strlen(p);
+ goto failure;
+ }
+ if (*p == '/') {
+ *p = '\0';
+ if (mkdir_defmode(fullpath) == 0)
+ break;
+ if (errno != ENOENT) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir mkdir %s failed",
+ full_fname(fullpath));
+ goto failure;
+ }
+ }
}
- p = fullpath;
- q = fullpath + strlen(bak_path);
- if (*q == '/')
- q++; /* Point past the middle '/' added by pathjoin(). */
-
- /* Make the directories */
- while ((p = strchr(p, '/')) != NULL) {
- *p = 0;
- if (do_lstat(fullpath, &st) != 0) {
- do_mkdir(fullpath, 0777 & ~orig_umask);
- if (p > q) {
- if (do_lstat(q, &st) != 0) {
- rprintf(FERROR, "make_bak_dir stat %s failed: %s\n",
- full_fname(fullpath), strerror(errno));
- } else {
- st2 = &st;
- set_modtime(fullpath, st2->st_mtime);
- if (do_lchown(fullpath, st2->st_uid, st2->st_gid) != 0) {
- rprintf(FERROR, "make_bak_dir chown %s failed: %s\n",
- full_fname(fullpath), strerror(errno));
- }
- if (do_chmod(fullpath, st2->st_mode) != 0) {
- rprintf(FERROR, "make_bak_dir failed to set permissions on %s: %s\n",
- full_fname(fullpath), strerror(errno));
- }
- }
+
+ /* Make all the dirs that we didn't find on the way here. */
+ while (1) {
+ if (p >= rel) {
+ /* Try to transfer the directory settings of the
+ * actual dir that the files are coming from. */
+ if (do_stat(rel, &st) < 0) {
+ rsyserr(FERROR, errno,
+ "make_bak_dir stat %s failed",
+ full_fname(rel));
+ } else {
+ do_lchown(fullpath, st.st_uid, st.st_gid);
+ do_chmod(fullpath, st.st_mode);
}
}
- *p++ = '/';
+ *p = '/';
+ p += strlen(p);
+ if (p == end)
+ break;
+ if (mkdir_defmode(fullpath) < 0) {
+ rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
+ full_fname(fullpath));
+ goto failure;
+ }
}
return 0;
+
+ failure:
+ while (p != end) {
+ *p = '/';
+ p += strlen(p);
+ }
+ return -1;
}
/* robustly move a file, creating new directory structures if necessary */
static int robust_move(char *src, char *dst)
{
- int keep_trying = 4;
- int keep_path_extfs = 0;
- int failed;
-
- while (keep_trying) {
- if (keep_path_extfs) {
- failed = copy_file(src, dst, 0755);
- if (!failed)
- do_unlink(src);
- } else
- failed = robust_rename(src, dst);
-
- if (failed) {
- if (verbose > 2) {
- rprintf(FERROR, "robust_move failed: %s(%d)\n",
- strerror(errno), errno);
- }
- switch (errno) {
- case EXDEV: /* external filesystem */
- keep_path_extfs = 1;
- keep_trying--;
- break;
- case ENOENT: /* no directory to write to */
- make_dir(dst, 0700);
- keep_trying--;
- break;
- default:
- keep_trying = 0;
- break;
- }
- } else
- keep_trying = 0;
- } /* while */
- return !failed;
-} /* robust_move */
+ if (robust_rename(src, dst, NULL, 0755) < 0
+ && (errno != ENOENT || make_bak_dir(dst) < 0
+ || robust_rename(src, dst, NULL, 0755) < 0))
+ return -1;
+ return 0;
+}
-/* if we have a backup_dir, then we get here from make_backup().
- We will move the file to be deleted into a parallel directory tree */
+/* If we have a --backup-dir, then we get here from make_backup().
+ * We will move the file to be deleted into a parallel directory tree. */
static int keep_backup(char *fname)
{
- static int initialised;
- char keep_name[MAXPATHLEN];
STRUCT_STAT st;
struct file_struct *file;
+ char *buf;
int kept = 0;
int ret_code;
- if (!initialised) {
- if (backup_dir_len && backup_dir[backup_dir_len - 1] == '/')
- backup_dir[--backup_dir_len] = '\0';
- if (verbose > 0)
- rprintf(FINFO, "backup_dir is %s\n", backup_dir);
- initialised = 1;
- }
-
/* return if no file to keep */
-#if SUPPORT_LINKS
- if (do_lstat(fname, &st)) return 1;
-#else
- if (do_stat(fname, &st)) return 1;
-#endif
-
- file = make_file(fname, NULL, NO_EXCLUDES);
+ if (do_lstat(fname, &st) < 0)
+ return 1;
- /* the file could have disappeared */
- if (!file) return 1;
+ if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
+ return 1; /* the file could have disappeared */
- /* make a complete pathname for backup file */
- if (stringjoin(keep_name, sizeof keep_name,
- backup_dir, "/", fname, backup_suffix, NULL)
- >= sizeof keep_name) {
- rprintf(FERROR, "keep_backup filename too long\n");
+ if (!(buf = get_backup_name(fname)))
return 0;
- }
-#ifdef HAVE_MKNOD
/* Check to see if this is a device file, or link */
- if (IS_DEVICE(file->mode)) {
- if (am_root && preserve_devices) {
- make_bak_dir(fname, backup_dir);
- if (do_mknod(keep_name, file->mode, file->u.rdev) != 0) {
- rprintf(FERROR, "mknod %s failed: %s\n",
- full_fname(keep_name), strerror(errno));
- } else if (verbose > 2) {
- rprintf(FINFO,
- "make_backup: DEVICE %s successful.\n",
- fname);
- }
+ if ((am_root && preserve_devices && IS_DEVICE(file->mode))
+ || (preserve_specials && IS_SPECIAL(file->mode))) {
+ do_unlink(buf);
+ if (do_mknod(buf, file->mode, file->u.rdev) < 0
+ && (errno != ENOENT || make_bak_dir(buf) < 0
+ || do_mknod(buf, file->mode, file->u.rdev) < 0)) {
+ rsyserr(FERROR, errno, "mknod %s failed",
+ full_fname(buf));
+ } else if (verbose > 2) {
+ rprintf(FINFO, "make_backup: DEVICE %s successful.\n",
+ fname);
}
kept = 1;
do_unlink(fname);
}
-#endif
if (!kept && S_ISDIR(file->mode)) {
/* make an empty directory */
- make_bak_dir(fname, backup_dir);
- do_mkdir(keep_name, file->mode);
- ret_code = do_rmdir(fname);
+ if (do_mkdir(buf, file->mode) < 0
+ && (errno != ENOENT || make_bak_dir(buf) < 0
+ || do_mkdir(buf, file->mode) < 0)) {
+ rsyserr(FINFO, errno, "mkdir %s failed",
+ full_fname(buf));
+ }
+ ret_code = do_rmdir(fname);
if (verbose > 2) {
rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
full_fname(fname), ret_code);
kept = 1;
}
-#if SUPPORT_LINKS
+#ifdef SUPPORT_LINKS
if (!kept && preserve_links && S_ISLNK(file->mode)) {
- extern int safe_symlinks;
- if (safe_symlinks && unsafe_symlink(file->u.link, keep_name)) {
+ if (safe_symlinks && unsafe_symlink(file->u.link, buf)) {
if (verbose) {
rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
- full_fname(keep_name), file->u.link);
+ full_fname(buf), file->u.link);
}
kept = 1;
+ } else {
+ do_unlink(buf);
+ if (do_symlink(file->u.link, buf) < 0
+ && (errno != ENOENT || make_bak_dir(buf) < 0
+ || do_symlink(file->u.link, buf) < 0)) {
+ rsyserr(FERROR, errno, "link %s -> \"%s\"",
+ full_fname(buf),
+ file->u.link);
+ }
+ do_unlink(fname);
+ kept = 1;
}
- make_bak_dir(fname, backup_dir);
- if (do_symlink(file->u.link, keep_name) != 0) {
- rprintf(FERROR, "link %s -> %s : %s\n",
- full_fname(keep_name), file->u.link, strerror(errno));
- }
- do_unlink(fname);
- kept = 1;
}
#endif
- if (!kept && preserve_hard_links && file->link_u.links
- && file->F_HEAD != file) {
- if (verbose > 1)
- rprintf(FINFO, "%s is a hard link\n", f_name(file));
- }
if (!kept && !S_ISREG(file->mode)) {
rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
fname);
+ return 1;
}
/* move to keep tree if a file */
if (!kept) {
- if (!robust_move(fname, keep_name)) {
- rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n",
- full_fname(fname), keep_name, strerror(errno));
+ if (robust_move(fname, buf) != 0) {
+ rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
+ full_fname(fname), buf);
+ } else if (st.st_nlink > 1) {
+ /* If someone has hard-linked the file into the backup
+ * dir, rename() might return success but do nothing! */
+ robust_unlink(fname); /* Just in case... */
}
}
- set_perms(keep_name, file, NULL, 0);
- free_file(file);
+ set_file_attrs(buf, file, NULL, 0);
free(file);
- if (verbose > 1)
- rprintf(FINFO, "keep_backup %s -> %s\n", fname, keep_name);
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ fname, buf);
+ }
return 1;
-} /* keep_backup */
+}
/* main backup switch routine */
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff