1 /* Cumulus: Smart Filesystem Backup to Dumb Servers
3 * Copyright (C) 2006-2008 The Regents of the University of California
4 * Written by Michael Vrable <mvrable@cs.ucsd.edu>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 /* Main entry point for LBS. Contains logic for traversing the filesystem and
22 * constructing a backup. */
35 #include <sys/sysmacros.h>
36 #include <sys/types.h>
62 /* Version information. This will be filled in by the Makefile. */
63 #ifndef CUMULUS_VERSION
64 #define CUMULUS_VERSION Unknown
66 #define CUMULUS_STRINGIFY(s) CUMULUS_STRINGIFY2(s)
67 #define CUMULUS_STRINGIFY2(s) #s
68 static const char cumulus_version[] = CUMULUS_STRINGIFY(CUMULUS_VERSION);
70 static RemoteStore *remote = NULL;
71 static TarSegmentStore *tss = NULL;
72 static MetadataWriter *metawriter = NULL;
74 /* Buffer for holding a single block of data read from a file. */
75 static const size_t LBS_BLOCK_SIZE = 1024 * 1024;
76 static char *block_buf;
78 /* Local database, which tracks objects written in this and previous
79 * invocations to help in creating incremental snapshots. */
82 /* Keep track of all segments which are needed to reconstruct the snapshot. */
83 std::set<string> segment_list;
85 /* Snapshot intent: 1=daily, 7=weekly, etc. This is not used directly, but is
86 * stored in the local database and can help guide segment cleaning and
87 * snapshot expiration policies. */
88 double snapshot_intent = 1.0;
90 /* Selection of files to include/exclude in the snapshot. */
91 std::list<string> includes; // Paths in which files should be saved
92 std::list<string> excludes; // Paths which will not be saved
93 std::list<string> excluded_names; // Directories which will not be saved
94 std::list<string> searches; // Directories we don't want to save, but
95 // do want to descend searching for data
98 bool relative_paths = true;
100 bool flag_rebuild_statcache = false;
102 /* Whether verbose output is enabled. */
103 bool verbose = false;
105 /* Ensure that the given segment is listed as a dependency of the current
107 void add_segment(const string& segment)
109 segment_list.insert(segment);
112 /* Read data from a file descriptor and return the amount of data read. A
113 * short read (less than the requested size) will only occur if end-of-file is
115 ssize_t file_read(int fd, char *buf, size_t maxlen)
117 size_t bytes_read = 0;
120 ssize_t res = read(fd, buf, maxlen);
124 fprintf(stderr, "error reading file: %m\n");
126 } else if (res == 0) {
138 /* Read the contents of a file (specified by an open file descriptor) and copy
139 * the data to the store. Returns the size of the file (number of bytes
140 * dumped), or -1 on error. */
141 int64_t dumpfile(int fd, dictionary &file_info, const string &path,
142 struct stat& stat_buf)
145 list<string> object_list;
146 const char *status = NULL; /* Status indicator printed out */
148 /* Look up this file in the old stat cache, if we can. If the stat
149 * information indicates that the file has not changed, do not bother
150 * re-reading the entire contents. Even if the information has been
151 * changed, we can use the list of old blocks in the search for a sub-block
152 * incremental representation. */
154 list<ObjectReference> old_blocks;
156 bool found = metawriter->find(path);
158 old_blocks = metawriter->get_blocks();
161 && !flag_rebuild_statcache
162 && metawriter->is_unchanged(&stat_buf)) {
165 /* If any of the blocks in the object have been expired, then we should
166 * fall back to fully reading in the file. */
167 for (list<ObjectReference>::const_iterator i = old_blocks.begin();
168 i != old_blocks.end(); ++i) {
169 const ObjectReference &ref = *i;
170 if (!db->IsAvailable(ref)) {
177 /* If everything looks okay, use the cached information */
179 file_info["checksum"] = metawriter->get_checksum();
180 for (list<ObjectReference>::const_iterator i = old_blocks.begin();
181 i != old_blocks.end(); ++i) {
182 const ObjectReference &ref = *i;
183 object_list.push_back(ref.to_string());
185 add_segment(ref.get_segment());
188 size = stat_buf.st_size;
192 /* If the file is new or changed, we must read in the contents a block at a
197 subfile.load_old_blocks(old_blocks);
200 ssize_t bytes = file_read(fd, block_buf, LBS_BLOCK_SIZE);
204 fprintf(stderr, "Backup contents for %s may be incorrect\n",
209 hash.process(block_buf, bytes);
211 // Sparse file processing: if we read a block of all zeroes, encode
213 bool all_zero = true;
214 for (int i = 0; i < bytes; i++) {
215 if (block_buf[i] != 0) {
221 // Either find a copy of this block in an already-existing segment,
222 // or index it so it can be re-used in the future
223 double block_age = 0.0;
226 SHA1Checksum block_hash;
227 block_hash.process(block_buf, bytes);
228 string block_csum = block_hash.checksum_str();
231 ref = ObjectReference(ObjectReference::REF_ZERO);
232 ref.set_range(0, bytes);
234 ref = db->FindObject(block_csum, bytes);
237 list<ObjectReference> refs;
239 // Store a copy of the object if one does not yet exist
241 LbsObject *o = new LbsObject;
244 /* We might still have seen this checksum before, if the object
245 * was stored at some time in the past, but we have decided to
246 * clean the segment the object was originally stored in
247 * (FindObject will not return such objects). When rewriting
248 * the object contents, put it in a separate group, so that old
249 * objects get grouped together. The hope is that these old
250 * objects will continue to be used in the future, and we
251 * obtain segments which will continue to be well-utilized.
252 * Additionally, keep track of the age of the data by looking
253 * up the age of the block which was expired and using that
254 * instead of the current time. */
255 if (db->IsOldObject(block_csum, bytes,
256 &block_age, &object_group)) {
257 if (object_group == 0) {
258 o->set_group("data");
261 sprintf(group, "compacted-%d", object_group);
267 o->set_group("data");
271 subfile.analyze_new_block(block_buf, bytes);
272 refs = subfile.create_incremental(tss, o, block_age);
274 if (flag_rebuild_statcache && ref.is_normal()) {
275 subfile.analyze_new_block(block_buf, bytes);
276 subfile.store_analyzed_signatures(ref);
281 while (!refs.empty()) {
282 ref = refs.front(); refs.pop_front();
283 object_list.push_back(ref.to_string());
285 add_segment(ref.get_segment());
294 file_info["checksum"] = hash.checksum_str();
297 // Sanity check: if we are rebuilding the statcache, but the file looks
298 // like it hasn't changed, then the newly-computed checksum should match
299 // the checksum in the statcache. If not, we have possible disk corruption
300 // and report a warning.
301 if (flag_rebuild_statcache) {
303 && metawriter->is_unchanged(&stat_buf)
304 && file_info["checksum"] != metawriter->get_checksum()) {
306 "Warning: Checksum for %s does not match expected value\n"
310 metawriter->get_checksum().c_str(),
311 file_info["checksum"].c_str());
315 if (verbose && status != NULL)
316 printf(" [%s]\n", status);
318 string blocklist = "";
319 for (list<string>::iterator i = object_list.begin();
320 i != object_list.end(); ++i) {
321 if (i != object_list.begin())
325 file_info["data"] = blocklist;
330 /* Dump a specified filesystem object (file, directory, etc.) based on its
331 * inode information. If the object is a regular file, an open filehandle is
333 void dump_inode(const string& path, // Path within snapshot
334 const string& fullpath, // Path to object in filesystem
335 struct stat& stat_buf, // Results of stat() call
336 int fd) // Open filehandle if regular file
339 dictionary file_info;
344 printf("%s\n", path.c_str());
345 metawriter->find(path);
347 file_info["name"] = uri_encode(path);
348 file_info["mode"] = encode_int(stat_buf.st_mode & 07777, 8);
349 file_info["ctime"] = encode_int(stat_buf.st_ctime);
350 file_info["mtime"] = encode_int(stat_buf.st_mtime);
351 file_info["user"] = encode_int(stat_buf.st_uid);
352 file_info["group"] = encode_int(stat_buf.st_gid);
354 time_t now = time(NULL);
355 if (now - stat_buf.st_ctime < 30 || now - stat_buf.st_mtime < 30)
356 if ((stat_buf.st_mode & S_IFMT) != S_IFDIR)
357 file_info["volatile"] = "1";
359 struct passwd *pwd = getpwuid(stat_buf.st_uid);
360 if (pwd != NULL && pwd->pw_name != NULL) {
361 file_info["user"] += " (" + uri_encode(pwd->pw_name) + ")";
364 struct group *grp = getgrgid(stat_buf.st_gid);
365 if (grp != NULL && grp->gr_name != NULL) {
366 file_info["group"] += " (" + uri_encode(grp->gr_name) + ")";
369 if (stat_buf.st_nlink > 1 && (stat_buf.st_mode & S_IFMT) != S_IFDIR) {
370 file_info["links"] = encode_int(stat_buf.st_nlink);
373 file_info["inode"] = encode_int(major(stat_buf.st_dev))
374 + "/" + encode_int(minor(stat_buf.st_dev))
375 + "/" + encode_int(stat_buf.st_ino);
379 switch (stat_buf.st_mode & S_IFMT) {
388 inode_type = ((stat_buf.st_mode & S_IFMT) == S_IFBLK) ? 'b' : 'c';
389 file_info["device"] = encode_int(major(stat_buf.st_rdev))
390 + "/" + encode_int(minor(stat_buf.st_rdev));
395 /* Use the reported file size to allocate a buffer large enough to read
396 * the symlink. Allocate slightly more space, so that we ask for more
397 * bytes than we expect and so check for truncation. */
398 buf = new char[stat_buf.st_size + 2];
399 len = readlink(fullpath.c_str(), buf, stat_buf.st_size + 1);
401 fprintf(stderr, "error reading symlink: %m\n");
402 } else if (len <= stat_buf.st_size) {
404 file_info["target"] = uri_encode(buf);
405 } else if (len > stat_buf.st_size) {
406 fprintf(stderr, "error reading symlink: name truncated\n");
414 file_size = dumpfile(fd, file_info, path, stat_buf);
415 file_info["size"] = encode_int(file_size);
418 return; // error occurred; do not dump file
420 if (file_size != stat_buf.st_size) {
421 fprintf(stderr, "Warning: Size of %s changed during reading\n",
423 file_info["volatile"] = "1";
432 fprintf(stderr, "Unknown inode type: mode=%x\n", stat_buf.st_mode);
436 file_info["type"] = string(1, inode_type);
438 metawriter->add(file_info);
441 void scanfile(const string& path, bool include)
445 struct stat stat_buf;
452 true_path = "/" + path;
454 // Set to true if we should scan through the contents of this directory,
455 // but not actually back files up
456 bool scan_only = false;
458 // Check this file against the include/exclude list to see if it should be
460 for (list<string>::iterator i = includes.begin();
461 i != includes.end(); ++i) {
467 for (list<string>::iterator i = excludes.begin();
468 i != excludes.end(); ++i) {
474 if (excluded_names.size() > 0) {
475 std::string name = path;
476 std::string::size_type last_slash = name.rfind('/');
477 if (last_slash != std::string::npos) {
478 name.replace(0, last_slash + 1, "");
481 for (list<string>::iterator i = excluded_names.begin();
482 i != excluded_names.end(); ++i) {
489 for (list<string>::iterator i = searches.begin();
490 i != searches.end(); ++i) {
496 if (!include && !scan_only)
499 if (lstat(true_path.c_str(), &stat_buf) < 0) {
500 fprintf(stderr, "lstat(%s): %m\n", path.c_str());
504 if ((stat_buf.st_mode & S_IFMT) == S_IFREG) {
505 /* Be paranoid when opening the file. We have no guarantee that the
506 * file was not replaced between the stat() call above and the open()
507 * call below, so we might not even be opening a regular file. We
508 * supply flags to open to to guard against various conditions before
509 * we can perform an lstat to check that the file is still a regular
511 * - O_NOFOLLOW: in the event the file was replaced by a symlink
512 * - O_NONBLOCK: prevents open() from blocking if the file was
514 * We also add in O_NOATIME, since this may reduce disk writes (for
515 * inode updates). However, O_NOATIME may result in EPERM, so if the
516 * initial open fails, try again without O_NOATIME. */
517 fd = open(true_path.c_str(), O_RDONLY|O_NOATIME|O_NOFOLLOW|O_NONBLOCK);
519 fd = open(true_path.c_str(), O_RDONLY|O_NOFOLLOW|O_NONBLOCK);
522 fprintf(stderr, "Unable to open file %s: %m\n", path.c_str());
526 /* Drop the use of the O_NONBLOCK flag; we only wanted that for file
528 flags = fcntl(fd, F_GETFL);
529 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
531 /* Perform the stat call again, and check that we still have a regular
533 if (fstat(fd, &stat_buf) < 0) {
534 fprintf(stderr, "fstat: %m\n");
539 if ((stat_buf.st_mode & S_IFMT) != S_IFREG) {
540 fprintf(stderr, "file is no longer a regular file!\n");
546 dump_inode(path, true_path, stat_buf, fd);
551 // If we hit a directory, now that we've written the directory itself,
552 // recursively scan the directory.
553 if ((stat_buf.st_mode & S_IFMT) == S_IFDIR) {
554 DIR *dir = opendir(true_path.c_str());
557 fprintf(stderr, "Error: %m\n");
562 vector<string> contents;
563 while ((ent = readdir(dir)) != NULL) {
564 string filename(ent->d_name);
565 if (filename == "." || filename == "..")
567 contents.push_back(filename);
572 sort(contents.begin(), contents.end());
574 for (vector<string>::iterator i = contents.begin();
575 i != contents.end(); ++i) {
576 const string& filename = *i;
578 scanfile(filename, include);
580 scanfile(path + "/" + filename, include);
585 /* Include the specified file path in the backups. Append the path to the
586 * includes list, and to ensure that we actually see the path when scanning the
587 * directory tree, add all the parent directories to the search list, which
588 * means we will scan through the directory listing even if the files
589 * themselves are excluded from being backed up. */
590 void add_include(const char *path)
592 /* Was an absolute path specified? If so, we'll need to start scanning
593 * from the root directory. Make sure that the user was consistent in
594 * providing either all relative paths or all absolute paths. */
595 if (path[0] == '/') {
596 if (includes.size() > 0 && relative_paths == true) {
598 "Error: Cannot mix relative and absolute paths!\n");
602 relative_paths = false;
604 // Skip over leading '/'
606 } else if (relative_paths == false && path[0] != '/') {
607 fprintf(stderr, "Error: Cannot mix relative and absolute paths!\n");
611 includes.push_back(path);
613 /* Split the specified path into directory components, and ensure that we
614 * descend into all the directories along the path. */
615 const char *slash = path;
620 while ((slash = strchr(slash + 1, '/')) != NULL) {
621 string component(path, slash - path);
622 searches.push_back(component);
626 void usage(const char *program)
631 "Usage: %s [OPTION]... --dest=DEST PATHS...\n"
632 "Produce backup snapshot of files in SOURCE and store to DEST.\n"
635 " --dest=PATH path where backup is to be written\n"
636 " --upload-script=COMMAND\n"
637 " program to invoke for each backup file generated\n"
638 " --exclude=PATH exclude files in PATH from snapshot\n"
639 " --exclude-name=NAME exclude files called NAME from snapshot\n"
640 " --localdb=PATH local backup metadata is stored in PATH\n"
641 " --tmpdir=PATH path for temporarily storing backup files\n"
642 " (defaults to TMPDIR environment variable or /tmp)\n"
643 " --filter=COMMAND program through which to filter segment data\n"
644 " (defaults to \"bzip2 -c\")\n"
645 " --filter-extension=EXT\n"
646 " string to append to segment files\n"
647 " (defaults to \".bz2\")\n"
648 " --signature-filter=COMMAND\n"
649 " program though which to filter descriptor\n"
650 " --scheme=NAME optional name for this snapshot\n"
651 " --intent=FLOAT intended backup type: 1=daily, 7=weekly, ...\n"
652 " (defaults to \"1\")\n"
653 " --full-metadata do not re-use metadata from previous backups\n"
654 " --rebuild-statcache re-read all file data to verify statcache\n"
655 " -v --verbose list files as they are backed up\n"
657 "Exactly one of --dest or --upload-script must be specified.\n",
658 cumulus_version, program
662 int main(int argc, char *argv[])
664 string backup_dest = "", backup_script = "";
665 string localdb_dir = "";
666 string backup_scheme = "";
667 string signature_filter = "";
669 string tmp_dir = "/tmp";
670 if (getenv("TMPDIR") != NULL)
671 tmp_dir = getenv("TMPDIR");
674 static struct option long_options[] = {
675 {"localdb", 1, 0, 0}, // 0
676 {"exclude", 1, 0, 0}, // 1
677 {"filter", 1, 0, 0}, // 2
678 {"filter-extension", 1, 0, 0}, // 3
679 {"dest", 1, 0, 0}, // 4
680 {"scheme", 1, 0, 0}, // 5
681 {"signature-filter", 1, 0, 0}, // 6
682 {"intent", 1, 0, 0}, // 7
683 {"full-metadata", 0, 0, 0}, // 8
684 {"tmpdir", 1, 0, 0}, // 9
685 {"upload-script", 1, 0, 0}, // 10
686 {"rebuild-statcache", 0, 0, 0}, // 11
687 {"exclude-name", 1, 0, 0}, // 12
688 // Aliases for short options
689 {"verbose", 0, 0, 'v'},
694 int c = getopt_long(argc, argv, "v", long_options, &long_index);
700 switch (long_index) {
702 localdb_dir = optarg;
705 if (optarg[0] != '/')
706 excludes.push_back(optarg);
708 excludes.push_back(optarg + 1);
711 filter_program = optarg;
713 case 3: // --filter-extension
714 filter_extension = optarg;
717 backup_dest = optarg;
720 backup_scheme = optarg;
722 case 6: // --signature-filter
723 signature_filter = optarg;
726 snapshot_intent = atof(optarg);
727 if (snapshot_intent <= 0)
730 case 8: // --full-metadata
731 flag_full_metadata = true;
736 case 10: // --upload-script
737 backup_script = optarg;
739 case 11: // --rebuild-statcache
740 flag_rebuild_statcache = true;
742 case 12: // --exclude-name
743 excluded_names.push_back(optarg);
746 fprintf(stderr, "Unhandled long option!\n");
761 if (optind == argc) {
766 searches.push_back(".");
767 for (int i = optind; i < argc; i++)
768 add_include(argv[i]);
770 if (backup_dest == "" && backup_script == "") {
772 "Error: Backup destination must be specified using --dest= or --upload-script=\n");
777 if (backup_dest != "" && backup_script != "") {
779 "Error: Cannot specify both --dest= and --upload-script=\n");
784 // Default for --localdb is the same as --dest
785 if (localdb_dir == "") {
786 localdb_dir = backup_dest;
788 if (localdb_dir == "") {
790 "Error: Must specify local database path with --localdb=\n");
795 block_buf = new char[LBS_BLOCK_SIZE];
797 /* Initialize the remote storage layer. If using an upload script, create
798 * a temporary directory for staging files. Otherwise, write backups
799 * directly to the destination directory. */
800 if (backup_script != "") {
801 tmp_dir = tmp_dir + "/lbs." + generate_uuid();
802 if (mkdir(tmp_dir.c_str(), 0700) < 0) {
803 fprintf(stderr, "Cannot create temporary directory %s: %m\n",
807 remote = new RemoteStore(tmp_dir, backup_script=backup_script);
809 remote = new RemoteStore(backup_dest);
812 /* Store the time when the backup started, so it can be included in the
818 localtime_r(&now, &time_buf);
819 strftime(desc_buf, sizeof(desc_buf), "%Y%m%dT%H%M%S", &time_buf);
821 /* Open the local database which tracks all objects that are stored
822 * remotely, for efficient incrementals. Provide it with the name of this
824 string database_path = localdb_dir + "/localdb.sqlite";
826 db->Open(database_path.c_str(), desc_buf, backup_scheme.c_str(),
829 tss = new TarSegmentStore(remote, db);
831 /* Initialize the stat cache, for skipping over unchanged files. */
832 metawriter = new MetadataWriter(tss, localdb_dir.c_str(), desc_buf,
833 backup_scheme.c_str());
835 scanfile(".", false);
837 ObjectReference root_ref = metawriter->close();
838 add_segment(root_ref.get_segment());
839 string backup_root = root_ref.to_string();
847 /* Write out a checksums file which lists the checksums for all the
848 * segments included in this snapshot. The format is designed so that it
849 * may be easily verified using the sha1sums command. */
850 const char csum_type[] = "sha1";
851 string checksum_filename = "snapshot-";
852 if (backup_scheme.size() > 0)
853 checksum_filename += backup_scheme + "-";
854 checksum_filename = checksum_filename + desc_buf + "." + csum_type + "sums";
855 RemoteFile *checksum_file = remote->alloc_file(checksum_filename,
857 FILE *checksums = fdopen(checksum_file->get_fd(), "w");
859 for (std::set<string>::iterator i = segment_list.begin();
860 i != segment_list.end(); ++i) {
861 string seg_path, seg_csum;
862 if (db->GetSegmentChecksum(*i, &seg_path, &seg_csum)) {
863 const char *raw_checksum = NULL;
864 if (strncmp(seg_csum.c_str(), csum_type,
865 strlen(csum_type)) == 0) {
866 raw_checksum = seg_csum.c_str() + strlen(csum_type);
867 if (*raw_checksum == '=')
873 if (raw_checksum != NULL)
874 fprintf(checksums, "%s *%s\n",
875 raw_checksum, seg_path.c_str());
880 SHA1Checksum checksum_csum;
882 checksum_filename = checksum_file->get_local_path();
883 if (checksum_csum.process_file(checksum_filename.c_str())) {
884 csum = checksum_csum.checksum_str();
887 checksum_file->send();
891 /* All other files should be flushed to remote storage before writing the
892 * backup descriptor below, so that it is not possible to have a backup
893 * descriptor written out depending on non-existent (not yet written)
897 /* Write a backup descriptor file, which says which segments are needed and
898 * where to start to restore this snapshot. The filename is based on the
899 * current time. If a signature filter program was specified, filter the
900 * data through that to give a chance to sign the descriptor contents. */
901 string desc_filename = "snapshot-";
902 if (backup_scheme.size() > 0)
903 desc_filename += backup_scheme + "-";
904 desc_filename = desc_filename + desc_buf + ".lbs";
906 RemoteFile *descriptor_file = remote->alloc_file(desc_filename,
908 int descriptor_fd = descriptor_file->get_fd();
909 if (descriptor_fd < 0) {
910 fprintf(stderr, "Unable to open descriptor output file: %m\n");
913 pid_t signature_pid = 0;
914 if (signature_filter.size() > 0) {
915 int new_fd = spawn_filter(descriptor_fd, signature_filter.c_str(),
917 close(descriptor_fd);
918 descriptor_fd = new_fd;
920 FILE *descriptor = fdopen(descriptor_fd, "w");
922 fprintf(descriptor, "Format: LBS Snapshot v0.8\n");
923 fprintf(descriptor, "Producer: Cumulus %s\n", cumulus_version);
924 strftime(desc_buf, sizeof(desc_buf), "%Y-%m-%d %H:%M:%S %z", &time_buf);
925 fprintf(descriptor, "Date: %s\n", desc_buf);
926 if (backup_scheme.size() > 0)
927 fprintf(descriptor, "Scheme: %s\n", backup_scheme.c_str());
928 fprintf(descriptor, "Backup-Intent: %g\n", snapshot_intent);
929 fprintf(descriptor, "Root: %s\n", backup_root.c_str());
931 if (csum.size() > 0) {
932 fprintf(descriptor, "Checksums: %s\n", csum.c_str());
935 fprintf(descriptor, "Segments:\n");
936 for (std::set<string>::iterator i = segment_list.begin();
937 i != segment_list.end(); ++i) {
938 fprintf(descriptor, " %s\n", i->c_str());
945 waitpid(signature_pid, &status, 0);
947 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
948 fatal("Signature filter process error");
952 descriptor_file->send();
957 if (backup_script != "") {
958 if (rmdir(tmp_dir.c_str()) < 0) {
960 "Warning: Cannot delete temporary directory %s: %m\n",