X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/3d19b4c83edab707de2ddf91b1469befc12de54e..e0ed4e4087ebeff0b0fe8f3419bcccf84fbd89a9:/backup.c

diff --git a/backup.c b/backup.c
index 54d5fae8..c45b3df3 100644
--- a/backup.c
+++ b/backup.c
@@ -21,26 +21,281 @@
 #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));
 }