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-rw-r--r--lib/backup-files.c622
1 files changed, 0 insertions, 622 deletions
diff --git a/lib/backup-files.c b/lib/backup-files.c
deleted file mode 100644
index e2c1ea1..0000000
--- a/lib/backup-files.c
+++ /dev/null
@@ -1,622 +0,0 @@
-/*
- File: backup-files.c
-
- Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
- Andreas Gruenbacher <agruen@suse.de>, SuSE Labs
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-*/
-
-/*
- * Create backup files of a list of files similar to GNU patch. A path
- * name prefix and suffix for the backup file can be specified with the
- * -B and -z options.
- */
-
-#define _GNU_SOURCE 1
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <utime.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <dirent.h>
-
-#if !defined(HAVE_MKSTEMP) && defined(HAVE_MKTEMP)
-# define mkstemp(x) creat(mktemp(x), 0600)
-#endif
-
-#ifndef PATH_MAX
-# define PATH_MAX 4096
-#endif
-
-#ifdef __MINGW32__
-#define mkdir(x,y) mkdir(x)
-/* Symlinks are not supported */
-#define lstat stat
-static int link(const char *oldpath, const char *newpath)
-{
- errno = ENOSYS;
- return -1;
-}
-#endif
-
-const char *progname;
-
-enum { what_noop, what_backup, what_restore, what_remove };
-
-const char *opt_prefix="", *opt_suffix="", *opt_file;
-int opt_silent, opt_what=what_noop;
-int opt_nolinks, opt_touch;
-int opt_keep_backup;
-
-#define LINE_LENGTH 1024
-
-
-static void
-usage(void)
-{
- printf("Usage: %s [-B prefix] [-z suffix] [-f {file|-}] [-sktL] [-b|-r|-x] {file|-} ...\n"
- "\n"
- "\tCreate hard linked backup copies of a list of files\n"
- "\tread from standard input.\n"
- "\n"
- "\t-b\tCreate backup\n"
- "\t-r\tRestore the backup\n"
- "\t-x\tRemove backup files and empty parent directories\n"
- "\t-k\tWhen doing a restore, keep the backup files\n"
- "\t-B\tPath name prefix for backup files\n"
- "\t-z\tPath name suffix for backup files\n"
- "\t-s\tSilent operation; only print error messages\n"
- "\t-f\tRead the filenames to process from file (- = standard input)\n"
- "\t-t\tTouch original files after restore (update their mtimes)\n\n"
- "\t-L\tEnsure that when finished, the source file has a link count of 1\n\n",
- progname);
-}
-
-static void *
-malloc_nofail(size_t size)
-{
- void *p = malloc(size);
- if (!p) {
- perror(progname);
- exit(1);
- }
- return p;
-}
-
-static void
-create_parents(const char *filename)
-{
- struct stat st;
- int rv = -1;
- char *fn = malloc_nofail(strlen(filename) + 1), *f;
-
- strcpy(fn, filename);
-
- f = strrchr(fn, '/');
- if (f == NULL)
- goto out;
- *f = '\0';
- if (stat(fn, &st) == 0)
- goto out;
- *f = '/';
-
- f = strchr(fn, '/');
- while (f != NULL) {
- *f = '\0';
- if (!rv || (rv = stat(fn, &st)) != 0) {
- mkdir(fn, 0777);
- }
- *f = '/';
- f = strchr(f+1, '/');
- }
-out:
- free(fn);
-}
-
-static void
-remove_parents(const char *filename)
-{
- char *fn = malloc_nofail(strlen(filename) + 1), *f;
-
- strcpy(fn, filename);
-
- f = strrchr(fn, '/');
- if (f == NULL)
- goto out;
- do {
- *f = '\0';
- if (rmdir(fn) == -1)
- goto out;
- } while ((f = strrchr(fn, '/')) != NULL);
- rmdir(fn);
-out:
- free(fn);
-}
-
-static int
-copy_fd(int from_fd, int to_fd)
-{
- char buffer[16384];
- char *wbuf;
- ssize_t len, l;
-
- for ( ;; ) {
- len = read(from_fd, buffer, sizeof(buffer));
- if (len == 0)
- return 0;
- if (len < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- return 1;
- }
- for (wbuf = buffer; len != 0; ) {
- l = write(to_fd, wbuf, len);
- if (l < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- return 1;
- }
- wbuf += l;
- len -= l;
- }
- }
-}
-
-static int
-copy_file(const char *from, const struct stat *st, const char *to)
-{
- int from_fd, to_fd, error = 1;
-
- if ((from_fd = open(from, O_RDONLY)) == -1) {
- perror(from);
- return 1;
- }
- unlink(to); /* make sure we don't inherit this file's mode. */
- if ((to_fd = creat(to, st->st_mode)) < 0) {
- perror(to);
- close(from_fd);
- return 1;
- }
-#if defined(HAVE_FCHMOD)
- (void) fchmod(to_fd, st->st_mode);
-#elif defined(HAVE_CHMOD)
- (void) chmod(to, st->st_mode);
-#endif
- if (copy_fd(from_fd, to_fd)) {
- fprintf(stderr, "%s -> %s: %s\n", from, to, strerror(errno));
- unlink(to);
- goto out;
- }
-
- error = 0;
-out:
- close(from_fd);
- close(to_fd);
-
- return error;
-}
-
-static int
-link_or_copy_file(const char *from, const struct stat *st, const char *to)
-{
- if (link(from, to) == 0)
- return 0;
- if (errno != EXDEV && errno != EPERM &&
- errno != EMLINK && errno != ENOSYS) {
- fprintf(stderr, "Could not link file `%s' to `%s': %s\n",
- from, to, strerror(errno));
- return 1;
- }
- return copy_file(from, st, to);
-}
-
-static int
-ensure_nolinks(const char *filename)
-{
- struct stat st;
-
- if (stat(filename, &st) != 0) {
- perror(filename);
- return 1;
- }
- if (st.st_nlink > 1) {
- char *tmpname = malloc(1 + strlen(filename) + 7 + 1), *c;
- int from_fd = -1, to_fd = -1;
- int error = 1;
-
- if (!tmpname)
- goto fail;
- from_fd = open(filename, O_RDONLY);
- if (from_fd == -1)
- goto fail;
-
- /* Temp file name is "path/to/.file.XXXXXX" */
- strcpy(tmpname, filename);
- strcat(tmpname, ".XXXXXX");
- c = strrchr(tmpname, '/');
- if (c == NULL)
- c = tmpname;
- else
- c++;
- memmove(c + 1, c, strlen(c) + 1);
- *c = '.';
-
- to_fd = mkstemp(tmpname);
- if (to_fd == -1)
- goto fail;
- if (copy_fd(from_fd, to_fd))
- goto fail;
-#if defined(HAVE_FCHMOD)
- (void) fchmod(to_fd, st.st_mode);
-#elif defined(HAVE_CHMOD)
- (void) chmod(tmpname, st.st_mode);
-#endif
- close(from_fd);
- from_fd = -1;
- close(to_fd);
- to_fd = -1;
- if (rename(tmpname, filename))
- goto fail;
-
- error = 0;
- fail:
- if (error)
- perror(filename);
- if (from_fd != -1)
- close(from_fd);
- if (to_fd != -1)
- close(to_fd);
- free(tmpname);
- return error;
- } else
- return 0;
-}
-
-static int
-process_file(const char *file)
-{
- char *backup = malloc_nofail(
- strlen(opt_prefix) + strlen(file) + strlen(opt_suffix) + 1);
-
- sprintf(backup, "%s%s%s", opt_prefix, file, opt_suffix);
-
- if (opt_what == what_backup) {
- struct stat st;
- int missing_file = (stat(file, &st) == -1 && errno == ENOENT);
-
- unlink(backup);
- create_parents(backup);
- if (missing_file) {
- int fd;
-
- if (!opt_silent)
- printf("New file %s\n", file);
- /* Old versions of GNU patch create new files with mode==0.
- (This has been changed/fixed in patch version 2.6.) */
- if ((fd = creat(backup, 0666)) == -1) {
- perror(backup);
- goto fail;
- }
- close(fd);
- } else {
- if (!opt_silent)
- printf("Copying %s\n", file);
- if (opt_nolinks && st.st_nlink == 1) {
- if (copy_file(file, &st, backup))
- goto fail;
- } else {
- if (link_or_copy_file(file, &st, backup))
- goto fail;
- if (opt_nolinks && ensure_nolinks(file))
- goto fail;
- }
- if (opt_touch)
- (void) utime(backup, NULL);
- else {
- struct utimbuf ut;
- ut.actime = ut.modtime = st.st_mtime;
- (void) utime(backup, &ut);
- }
- }
- } else if (opt_what == what_restore) {
- struct stat st;
-
- create_parents(file);
- if (stat(backup, &st) != 0) {
- perror(backup);
- goto fail;
- }
- if (st.st_size == 0) {
- if (unlink(file) == 0 || errno == ENOENT) {
- if (!opt_silent)
- printf("Removing %s\n", file);
- } else {
- perror(file);
- goto fail;
- }
- if (!opt_keep_backup) {
- unlink(backup);
- remove_parents(backup);
- }
- } else {
- if (!opt_silent)
- printf("Restoring %s\n", file);
- unlink(file);
- if (opt_nolinks && st.st_nlink != 1) {
- if (copy_file(backup, &st, file))
- goto fail;
- } else {
- if (link_or_copy_file(backup, &st, file))
- goto fail;
- if (opt_nolinks && ensure_nolinks(file))
- goto fail;
- }
- if (!opt_keep_backup) {
- unlink(backup);
- remove_parents(backup);
- }
- if (opt_touch)
- (void) utime(file, NULL);
- else {
- struct utimbuf ut;
- ut.actime = ut.modtime = st.st_mtime;
- (void) utime(file, &ut);
- }
- }
- } else if (opt_what == what_remove) {
- unlink(backup);
- remove_parents(backup);
- } else if (opt_what == what_noop) {
- struct stat st;
- int missing_file = (stat(file, &st) == -1 && errno == ENOENT);
-
- if (!missing_file && opt_nolinks) {
- if (ensure_nolinks(file))
- goto fail;
- }
- } else
- goto fail;
-
- free(backup);
- return 0;
-
-fail:
- free(backup);
- return 1;
-}
-
-static int
-foreachdir_rec(const char *path, struct stat *st,
- int (*walk)(const char *, const struct stat *))
-{
- DIR *dir;
- struct dirent *dp;
- int failed = 0;
-
- struct path {
- char *name;
- struct path *next;
- };
- struct path *paths = NULL, *last_path = NULL;
-
- if (access(path, R_OK|X_OK) || !(dir = opendir(path)))
- return walk(path, NULL);
- while ((dp = readdir(dir))) {
- struct path *p;
- size_t size;
-
- if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
- continue;
-
- p = malloc_nofail(sizeof(*p));
- if (!last_path)
- paths = p;
- else
- last_path->next = p;
- p->next = NULL;
- last_path = p;
-
- size = strlen(path) + 1 + strlen(dp->d_name) + 1;
- p->name = malloc_nofail(size);
- sprintf(p->name, "%s/%s", path, dp->d_name);
- }
- if (closedir(dir) != 0)
- failed = -1;
-
- while (paths != NULL) {
- struct path *next;
-
- if (lstat(paths->name, st))
- continue; /* file has disappeared meanwhile */
- if (S_ISDIR(st->st_mode)) {
- failed = foreachdir_rec(paths->name, st, walk);
- if (failed)
- goto out;
- } else {
- failed = walk(paths->name, st);
- if (failed)
- goto out;
- }
- next = paths->next;
- free(paths->name);
- free(paths);
- paths = next;
- }
-
-out:
- return failed;
-}
-
-static int
-foreachdir(const char *path,
- int (*walk)(const char *, const struct stat *))
-{
- struct stat st;
-
- if (lstat(path, &st))
- return walk(path, NULL);
- return foreachdir_rec(path, &st, walk);
-}
-
-static int
-walk(const char *path, const struct stat *st)
-{
- size_t prefix_len=strlen(opt_prefix), suffix_len=strlen(opt_suffix);
- size_t len = strlen(path);
- char *p;
- int ret;
-
- if (!st) {
- perror(path);
- return 1;
- }
- if (!S_ISREG(st->st_mode))
- return 0;
- if (strncmp(opt_prefix, path, prefix_len))
- return 0; /* prefix does not match */
- if (len < suffix_len || strcmp(opt_suffix, path + len - suffix_len))
- return 0; /* suffix does not match */
-
- p = malloc_nofail(len - prefix_len - suffix_len + 1);
- memcpy(p, path + prefix_len, len - prefix_len - suffix_len);
- p[len - prefix_len - suffix_len] = '\0';
- ret = process_file(p);
- free(p);
- return ret;
-}
-
-int
-main(int argc, char *argv[])
-{
- int opt, status = 0;
-
- progname = argv[0];
-
- while ((opt = getopt(argc, argv, "brkxB:z:f:shLt")) != -1) {
- switch(opt) {
- case 'b':
- opt_what = what_backup;
- break;
-
- case 'r':
- opt_what = what_restore;
- break;
-
- case 'k':
- opt_keep_backup = 1;
- break;
-
- case 'x':
- opt_what = what_remove;
- break;
-
- case 'B':
- opt_prefix = optarg;
- break;
-
- case 'f':
- opt_file = optarg;
- break;
-
- case 'z':
- opt_suffix = optarg;
- break;
-
- case 's':
- opt_silent = 1;
- break;
-
- case 'L':
- opt_nolinks = 1;
- break;
-
- case 't':
- opt_touch = 1;
- break;
-
- case 'h':
- default:
- usage();
- return 0;
- }
- }
-
- if ((*opt_prefix == '\0' && *opt_suffix == '\0') ||
- (opt_file == NULL && optind == argc)) {
- usage();
- return 1;
- }
-
- if (opt_file != NULL) {
- FILE *file;
- char line[LINE_LENGTH];
-
- if (!strcmp(opt_file, "-")) {
- file = stdin;
- } else {
- if ((file = fopen(opt_file, "r")) == NULL) {
- perror(opt_file);
- return 1;
- }
- }
-
- while (fgets(line, sizeof(line), file)) {
- char *l = strchr(line, '\0');
-
- if (l > line && *(l-1) == '\n')
- *(l-1) = '\0';
- if (*line == '\0')
- continue;
-
- if ((status = process_file(line)) != 0)
- return status;
- }
-
- if (file != stdin) {
- fclose(file);
- }
- }
- for (; optind < argc; optind++) {
- if (strcmp(argv[optind], "-") == 0) {
- struct stat st;
- char *dir = strdup(opt_prefix), *d = strrchr(dir, '/');
- if (d)
- *d = '\0';
- else
- d = ".";
- if (stat(dir, &st) == 0) {
- status = foreachdir(dir, walk);
- if (status == -1)
- perror(dir);
- }
- free(dir);
- } else
- status = process_file(argv[optind]);
- if (status)
- return status;
- }
-
- return status;
-}
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