-/*
- 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_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 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 (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
- 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;
}
- slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
- if (do_rename(fname,fnamebak) != 0) {
- /* cygwin (at least version b19) reports EINVAL */
- if (errno != ENOENT && errno != EINVAL) {
- rprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));
- 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];
- extern int orig_umask;
- char *p;
- char *q;
-
- while(strncmp(bak_path,"./",2)==0) bak_path += 2;
-
- if(bak_path[strlen(bak_path)-1]!='/') {
- slprintf(fullpath,sizeof(fullpath),"%s/",bak_path);
- } else {
- slprintf(fullpath,sizeof(fullpath),"%s",bak_path);
- }
- p=fullpath;
- q=&fullpath[strlen(fullpath)]; /* End of bak_path string */
- strcat(fullpath,fname);
-
- /* Make the directories */
- while ((p=strchr(p,'/'))) {
- *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 : %s\n",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 : %s\n",fullpath,strerror(errno));
- };
- if(do_chmod(fullpath,st2->st_mode)!=0) {
- rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",fullpath,strerror(errno));
- };
- };
- }
- };
- *p = '/';
- p++;
- }
- return 0;
+ STRUCT_STAT st;
+ 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;
+ }
+ }
+ }
+
+ /* 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 += 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 (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 (failed) {
- if (verbose > 2)
- rprintf (FERROR, "robust_move failed: %s(%d)\n",
- strerror (errno), errno);
- switch (errno) {
- /* external filesystem */
- case EXDEV:
- keep_path_extfs = 1;
- keep_trying--;
- break;
- /* no directory to write to */
- case ENOENT:
- make_dir (dst, 0755);
- keep_trying--;
- break;
- default:
- keep_trying = 0;
- } /* switch */
- } else
- keep_trying = 0;
- } /* while */
- return (!failed);
-} /* robust_move */
-
-
-/* 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;
-
- int kept=0;
+ char *buf;
+ int kept = 0;
int ret_code;
- if (!initialised) {
- if (backup_dir[strlen(backup_dir) - 1] == '/')
- backup_dir[strlen(backup_dir) - 1] = 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
+ if (do_lstat(fname, &st) < 0)
+ return 1;
- file = make_file(-1, fname, NULL, 1);
-
- /* the file could have disappeared */
- if (!file) return 1;
-
- /* make a complete pathname for backup file */
- if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) {
- rprintf (FERROR, "keep_backup filename too long\n");
- return 0;
- }
-
- slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
+ if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS)))
+ return 1; /* the file could have disappeared */
+ 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->rdev)!=0) {
- rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno));
- } else {
- if(verbose>2)
- rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname);
- };
- };
- kept=1;
- do_unlink(fname);
- };
-#endif
+ 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);
+ }
- if(!kept && S_ISDIR(file->mode)) {
+ 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(verbose>2)
- rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code);
- kept=1;
- };
-
-#if SUPPORT_LINKS
- if(!kept && preserve_links && S_ISLNK(file->mode)) {
- extern int safe_symlinks;
- if (safe_symlinks && unsafe_symlink(file->link, keep_name)) {
- if (verbose) {
- rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
- keep_name,file->link);
- }
- kept=1;
- }
- make_bak_dir(fname,backup_dir);
- if(do_symlink(file->link,keep_name) != 0) {
- rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno));
- };
- do_unlink(fname);
- kept=1;
- };
+ 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;
+ }
+
+#ifdef SUPPORT_LINKS
+ if (!kept && preserve_links && S_ISLNK(file->mode)) {
+ if (safe_symlinks && unsafe_symlink(file->u.link, buf)) {
+ if (verbose) {
+ rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
+ 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;
+ }
+ }
#endif
- if(!kept && preserve_hard_links && check_hard_link(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);
- }
+ 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",
- fname, keep_name, strerror(errno));
- };
- set_perms (keep_name, file, NULL, 0);
- free_file (file);
- free (file);
-
- if (verbose > 1)
- rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name);
+ if (!kept) {
+ 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_file_attrs(buf, file, NULL, 0);
+ free(file);
+
+ if (verbose > 1) {
+ rprintf(FINFO, "backed up %s to %s\n",
+ fname, buf);
+ }
return 1;
-} /* keep_backup */
+}
/* main backup switch routine */
int make_backup(char *fname)
{
if (backup_dir)
- return (keep_backup(fname));
- else
- return (make_simple_backup(fname));
+ return keep_backup(fname);
+ return make_simple_backup(fname);
}
-
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