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/*
Copyright (C) Andrew Tridgell 1999
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* backup handling code */
#include "rsync.h"
extern int verbose;
extern int suffix_specified;
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;
/* 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");
return 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) {
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);
}
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 : %s\n",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 : %s\n",fullpath,strerror(errno));
};
if(do_chmod(fullpath,st2->st_mode)!=0) {
rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",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, 0755);
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[strlen(backup_dir) - 1] == '/')
backup_dir[strlen(backup_dir) - 1] = 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 (strlen(backup_dir) + strlen(fname) +
(suffix_specified ? strlen(backup_suffix) : 0) > (MAXPATHLEN - 1)) {
rprintf (FERROR, "keep_backup filename too long\n");
return 0;
}
if (suffix_specified) {
snprintf(keep_name, sizeof (keep_name), "%s/%s%s", backup_dir, fname, backup_suffix);
} else {
snprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname);
}
#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 : %s\n",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",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",
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",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",
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));
}
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