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/*
* Deletion routines used in rsync.
*
* Copyright (C) 1996-2000 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2020 Wayne Davison
*
* 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 3 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, visit the http://fsf.org website.
*/
#include "rsync.h"
extern int am_root;
extern int make_backups;
extern int max_delete;
extern char *backup_dir;
extern char *backup_suffix;
extern int backup_suffix_len;
extern struct stats stats;
int ignore_perishable = 0;
int non_perishable_cnt = 0;
int skipped_deletes = 0;
static inline int is_backup_file(char *fn)
{
int k = strlen(fn) - backup_suffix_len;
return k > 0 && strcmp(fn+k, backup_suffix) == 0;
}
/* The directory is about to be deleted: if DEL_RECURSE is given, delete all
* its contents, otherwise just checks for content. Returns DR_SUCCESS or
* DR_NOT_EMPTY. Note that fname must point to a MAXPATHLEN buffer! (The
* buffer is used for recursion, but returned unchanged.)
*/
static enum delret delete_dir_contents(char *fname, uint16 flags)
{
struct file_list *dirlist;
enum delret ret;
unsigned remainder;
void *save_filters;
int j, dlen;
char *p;
if (DEBUG_GTE(DEL, 3)) {
rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
fname, flags);
}
dlen = strlen(fname);
save_filters = push_local_filters(fname, dlen);
non_perishable_cnt = 0;
dirlist = get_dirlist(fname, dlen, 0);
ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
if (!dirlist->used)
goto done;
if (!(flags & DEL_RECURSE)) {
ret = DR_NOT_EMPTY;
goto done;
}
p = fname + dlen;
if (dlen != 1 || *fname != '/')
*p++ = '/';
remainder = MAXPATHLEN - (p - fname);
/* We do our own recursion, so make delete_item() non-recursive. */
flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
| DEL_DIR_IS_EMPTY;
for (j = dirlist->used; j--; ) {
struct file_struct *fp = dirlist->files[j];
if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
if (DEBUG_GTE(DEL, 1)) {
rprintf(FINFO,
"mount point, %s, pins parent directory\n",
f_name(fp, NULL));
}
ret = DR_NOT_EMPTY;
continue;
}
strlcpy(p, fp->basename, remainder);
if (!(fp->mode & S_IWUSR) && !am_root && fp->flags & FLAG_OWNED_BY_US)
do_chmod(fname, fp->mode | S_IWUSR);
/* Save stack by recursing to ourself directly. */
if (S_ISDIR(fp->mode)) {
if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
ret = DR_NOT_EMPTY;
}
if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
ret = DR_NOT_EMPTY;
}
fname[dlen] = '\0';
done:
flist_free(dirlist);
pop_local_filters(save_filters);
if (ret == DR_NOT_EMPTY) {
rprintf(FINFO, "cannot delete non-empty directory: %s\n",
fname);
}
return ret;
}
/* Delete a file or directory. If DEL_RECURSE is set in the flags, this will
* delete recursively.
*
* Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
* a directory! (The buffer is used for recursion, but returned unchanged.)
*/
enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
{
enum delret ret;
char *what;
int ok;
if (DEBUG_GTE(DEL, 2)) {
rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
fbuf, (int)mode, (int)flags);
}
if (flags & DEL_NO_UID_WRITE)
do_chmod(fbuf, mode | S_IWUSR);
if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
/* This only happens on the first call to delete_item() since
* delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
ignore_perishable = 1;
/* If DEL_RECURSE is not set, this just reports emptiness. */
ret = delete_dir_contents(fbuf, flags);
ignore_perishable = 0;
if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
goto check_ret;
/* OK: try to delete the directory. */
}
if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && stats.deleted_files >= max_delete) {
skipped_deletes++;
return DR_AT_LIMIT;
}
if (S_ISDIR(mode)) {
what = "rmdir";
ok = do_rmdir(fbuf) == 0;
} else {
if (make_backups > 0 && !(flags & DEL_FOR_BACKUP) && (backup_dir || !is_backup_file(fbuf))) {
what = "make_backup";
ok = make_backup(fbuf, True);
if (ok == 2) {
what = "unlink";
ok = robust_unlink(fbuf) == 0;
}
} else {
what = "unlink";
ok = robust_unlink(fbuf) == 0;
}
}
if (ok) {
if (!(flags & DEL_MAKE_ROOM)) {
log_delete(fbuf, mode);
stats.deleted_files++;
if (S_ISREG(mode)) {
/* Nothing more to count */
} else if (S_ISDIR(mode))
stats.deleted_dirs++;
#ifdef SUPPORT_LINKS
else if (S_ISLNK(mode))
stats.deleted_symlinks++;
#endif
else if (IS_DEVICE(mode))
stats.deleted_symlinks++;
else
stats.deleted_specials++;
}
ret = DR_SUCCESS;
} else {
if (S_ISDIR(mode) && errno == ENOTEMPTY) {
rprintf(FINFO, "cannot delete non-empty directory: %s\n",
fbuf);
ret = DR_NOT_EMPTY;
} else if (errno != ENOENT) {
rsyserr(FERROR_XFER, errno, "delete_file: %s(%s) failed",
what, fbuf);
ret = DR_FAILURE;
} else
ret = DR_SUCCESS;
}
check_ret:
if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
const char *desc;
switch (flags & DEL_MAKE_ROOM) {
case DEL_FOR_FILE: desc = "regular file"; break;
case DEL_FOR_DIR: desc = "directory"; break;
case DEL_FOR_SYMLINK: desc = "symlink"; break;
case DEL_FOR_DEVICE: desc = "device file"; break;
case DEL_FOR_SPECIAL: desc = "special file"; break;
default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
}
rprintf(FERROR_XFER, "could not make way for %s %s: %s\n",
flags & DEL_FOR_BACKUP ? "backup" : "new",
desc, fbuf);
}
return ret;
}
uint16 get_del_for_flag(uint16 mode)
{
if (S_ISREG(mode))
return DEL_FOR_FILE;
if (S_ISDIR(mode))
return DEL_FOR_DIR;
if (S_ISLNK(mode))
return DEL_FOR_SYMLINK;
if (IS_DEVICE(mode))
return DEL_FOR_DEVICE;
if (IS_SPECIAL(mode))
return DEL_FOR_SPECIAL;
exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
}
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