a039749b4c
to do this. This is not used in every case yet -- I've just changed a few cases that were causing trouble. Please convert others as you see them.
292 lines
8.5 KiB
C
292 lines
8.5 KiB
C
/*
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Copyright (C) Andrew Tridgell 1999
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* backup handling code */
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#include "rsync.h"
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extern int verbose;
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extern char *backup_suffix;
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extern char *backup_dir;
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extern int am_root;
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extern int preserve_devices;
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extern int preserve_links;
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extern int preserve_hard_links;
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/* simple backup creates a backup with a suffix in the same directory */
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static int make_simple_backup(char *fname)
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{
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char fnamebak[MAXPATHLEN];
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if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
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rprintf(FERROR,"backup filename too long\n");
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return 0;
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}
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slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
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if (do_rename(fname,fnamebak) != 0) {
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/* cygwin (at least version b19) reports EINVAL */
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if (errno != ENOENT && errno != EINVAL) {
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rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak);
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return 0;
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}
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} else if (verbose > 1) {
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rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
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}
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return 1;
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}
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/* recursively make a directory path */
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static int make_dir(char *name, int mask)
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{
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char newdir [MAXPATHLEN];
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char *p, *d;
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/* copy pathname over, look for last '/' */
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for (p = d = newdir; *name; *d++ = *name++)
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if (*name == '/')
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p = d;
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if (p == newdir)
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return 0;
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*p = 0;
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/* make the new directory, if that fails then make its parent */
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while (do_mkdir (newdir, mask) != 0)
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if ((errno != ENOENT) || !make_dir (newdir, mask))
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return 0;
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return 1;
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} /* make_dir */
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/****************************************************************************
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Create a directory given an absolute path, perms based upon another directory
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path
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****************************************************************************/
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static int make_bak_dir(char *fname,char *bak_path)
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{
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STRUCT_STAT st;
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STRUCT_STAT *st2;
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char fullpath[MAXPATHLEN];
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extern int orig_umask;
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char *p;
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char *q;
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while(strncmp(bak_path,"./",2)==0) bak_path += 2;
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if(bak_path[strlen(bak_path)-1]!='/') {
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slprintf(fullpath,sizeof(fullpath),"%s/",bak_path);
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} else {
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slprintf(fullpath,sizeof(fullpath),"%s",bak_path);
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}
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p=fullpath;
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q=&fullpath[strlen(fullpath)]; /* End of bak_path string */
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strcat(fullpath,fname);
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/* Make the directories */
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while ((p=strchr(p,'/'))) {
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*p = 0;
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if(do_lstat(fullpath,&st)!=0) {
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do_mkdir(fullpath,0777 & ~orig_umask);
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if(p>q) {
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if(do_lstat(q,&st)!=0) {
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rprintf(FERROR,"make_bak_dir stat %s : %s\n",fullpath,strerror(errno));
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} else {
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st2=&st;
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set_modtime(fullpath,st2->st_mtime);
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if(do_lchown(fullpath,st2->st_uid,st2->st_gid)!=0) {
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rprintf(FERROR,"make_bak_dir chown %s : %s\n",fullpath,strerror(errno));
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};
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if(do_chmod(fullpath,st2->st_mode)!=0) {
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rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",fullpath,strerror(errno));
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};
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};
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}
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};
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*p = '/';
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p++;
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}
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return 0;
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}
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/* robustly move a file, creating new directory structures if necessary */
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static int robust_move(char *src, char *dst)
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{
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int keep_trying = 4;
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int keep_path_extfs = 0;
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int failed;
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while (keep_trying) {
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if (keep_path_extfs) {
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failed = copy_file(src, dst, 0755);
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if (!failed) {
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do_unlink(src);
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}
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} else {
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failed = robust_rename (src, dst);
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}
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if (failed) {
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if (verbose > 2)
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rprintf (FERROR, "robust_move failed: %s(%d)\n",
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strerror (errno), errno);
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switch (errno) {
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/* external filesystem */
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case EXDEV:
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keep_path_extfs = 1;
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keep_trying--;
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break;
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/* no directory to write to */
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case ENOENT:
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make_dir (dst, 0755);
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keep_trying--;
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break;
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default:
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keep_trying = 0;
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} /* switch */
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} else
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keep_trying = 0;
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} /* while */
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return (!failed);
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} /* robust_move */
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/* if we have a backup_dir, then we get here from make_backup().
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We will move the file to be deleted into a parallel directory tree */
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static int keep_backup(char *fname)
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{
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static int initialised;
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char keep_name [MAXPATHLEN];
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STRUCT_STAT st;
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struct file_struct *file;
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int kept=0;
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int ret_code;
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if (!initialised) {
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if (backup_dir[strlen(backup_dir) - 1] == '/')
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backup_dir[strlen(backup_dir) - 1] = 0;
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if (verbose > 0)
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rprintf (FINFO, "backup_dir is %s\n", backup_dir);
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initialised = 1;
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}
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/* return if no file to keep */
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#if SUPPORT_LINKS
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if (do_lstat (fname, &st)) return 1;
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#else
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if (do_stat (fname, &st)) return 1;
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#endif
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file = make_file(-1, fname, NULL, 1);
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/* the file could have disappeared */
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if (!file) return 1;
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/* make a complete pathname for backup file */
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if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) {
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rprintf (FERROR, "keep_backup filename too long\n");
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return 0;
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}
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slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
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#ifdef HAVE_MKNOD
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/* Check to see if this is a device file, or link */
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if(IS_DEVICE(file->mode)) {
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if(am_root && preserve_devices) {
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make_bak_dir(fname,backup_dir);
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if(do_mknod(keep_name,file->mode,file->rdev)!=0) {
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rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno));
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} else {
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if(verbose>2)
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rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname);
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};
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};
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kept=1;
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do_unlink(fname);
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};
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#endif
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if(!kept && S_ISDIR(file->mode)) {
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/* make an empty directory */
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make_bak_dir(fname,backup_dir);
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do_mkdir(keep_name,file->mode);
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ret_code=do_rmdir(fname);
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if(verbose>2)
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rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code);
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kept=1;
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};
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#if SUPPORT_LINKS
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if(!kept && preserve_links && S_ISLNK(file->mode)) {
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extern int safe_symlinks;
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if (safe_symlinks && unsafe_symlink(file->link, keep_name)) {
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if (verbose) {
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rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
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keep_name,file->link);
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}
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kept=1;
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}
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make_bak_dir(fname,backup_dir);
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if(do_symlink(file->link,keep_name) != 0) {
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rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno));
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};
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do_unlink(fname);
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kept=1;
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};
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#endif
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if(!kept && preserve_hard_links && check_hard_link(file)) {
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if(verbose > 1) rprintf(FINFO,"%s is a hard link\n",f_name(file));
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};
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if(!kept && !S_ISREG(file->mode)) {
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rprintf(FINFO,"make_bak: skipping non-regular file %s\n",fname);
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}
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/* move to keep tree if a file */
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if(!kept) {
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if (!robust_move (fname, keep_name))
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rprintf(FERROR, "keep_backup failed %s -> %s : %s\n",
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fname, keep_name, strerror(errno));
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};
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set_perms (keep_name, file, NULL, 0);
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free_file (file);
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free (file);
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if (verbose > 1)
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rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name);
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return 1;
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} /* keep_backup */
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/* main backup switch routine */
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int make_backup(char *fname)
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{
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if (backup_dir)
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return (keep_backup(fname));
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else
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return (make_simple_backup(fname));
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}
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