#include "rsync.h"
extern int verbose;
+extern int backup_suffix_len;
+extern int backup_dir_len;
extern char *backup_suffix;
+extern char *backup_dir;
+extern int am_root;
+extern int preserve_devices;
+extern int preserve_links;
+extern int preserve_hard_links;
-int make_backup(char *fname)
+/* simple backup creates a backup with a suffix in the same directory */
+static int make_simple_backup(char *fname)
{
char fnamebak[MAXPATHLEN];
- if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
- rprintf(FERROR,"backup filename too long\n");
+ if (strlen(fname) + backup_suffix_len > MAXPATHLEN-1) {
+ rprintf(FERROR, "backup filename too long\n");
return 0;
}
- slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
- if (do_rename(fname,fnamebak) != 0) {
+ snprintf(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));
+ 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);
+ rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak);
+ }
+ return 1;
+}
+
+
+/* recursively make a directory path */
+static int make_dir(char *name, int mask)
+{
+ 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)
+ 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;
+
+ 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)
+{
+ 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] != '/') {
+ snprintf(fullpath, sizeof(fullpath), "%s/", bak_path);
+ } else {
+ snprintf(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 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));
+ }
+ }
+ }
+ }
+ *p = '/';
+ p++;
+ }
+ return 0;
+}
+
+/* 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) {
+ /* external filesystem */
+ case EXDEV:
+ keep_path_extfs = 1;
+ keep_trying--;
+ break;
+ /* no directory to write to */
+ case ENOENT:
+ make_dir(dst, 0700);
+ 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 */
+static int keep_backup(char *fname)
+{
+
+ static int initialised;
+
+ char keep_name [MAXPATHLEN];
+ STRUCT_STAT st;
+ struct file_struct *file;
+
+ 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);
+
+ /* the file could have disappeared */
+ if (!file) return 1;
+
+ /* make a complete pathname for backup file */
+ if (backup_dir_len+strlen(fname)+backup_suffix_len > MAXPATHLEN-1) {
+ rprintf (FERROR, "keep_backup filename too long\n");
+ return 0;
+ }
+
+ snprintf(keep_name, sizeof (keep_name), "%s/%s%s",
+ backup_dir, fname, backup_suffix);
+
+#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 failed: %s\n",
+ full_fname(keep_name), strerror(errno));
+ } 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(verbose>2) {
+ rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
+ full_fname(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",
+ full_fname(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",
+ full_fname(keep_name), file->link, strerror(errno));
+ }
+ 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);
}
+
+ /* 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));
+ }
+ }
+ 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);
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));
}
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff