1: /*
2: * Deletion routines used in rsync.
3: *
4: * Copyright (C) 1996-2000 Andrew Tridgell
5: * Copyright (C) 1996 Paul Mackerras
6: * Copyright (C) 2002 Martin Pool <mbp@samba.org>
7: * Copyright (C) 2003-2013 Wayne Davison
8: *
9: * This program is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 3 of the License, or
12: * (at your option) any later version.
13: *
14: * This program is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: * GNU General Public License for more details.
18: *
19: * You should have received a copy of the GNU General Public License along
20: * with this program; if not, visit the http://fsf.org website.
21: */
22:
23: #include "rsync.h"
24:
25: extern int am_root;
26: extern int make_backups;
27: extern int max_delete;
28: extern char *backup_dir;
29: extern char *backup_suffix;
30: extern int backup_suffix_len;
31: extern struct stats stats;
32:
33: int ignore_perishable = 0;
34: int non_perishable_cnt = 0;
35: int skipped_deletes = 0;
36:
37: static inline int is_backup_file(char *fn)
38: {
39: int k = strlen(fn) - backup_suffix_len;
40: return k > 0 && strcmp(fn+k, backup_suffix) == 0;
41: }
42:
43: /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
44: * its contents, otherwise just checks for content. Returns DR_SUCCESS or
45: * DR_NOT_EMPTY. Note that fname must point to a MAXPATHLEN buffer! (The
46: * buffer is used for recursion, but returned unchanged.)
47: */
48: static enum delret delete_dir_contents(char *fname, uint16 flags)
49: {
50: struct file_list *dirlist;
51: enum delret ret;
52: unsigned remainder;
53: void *save_filters;
54: int j, dlen;
55: char *p;
56:
57: if (DEBUG_GTE(DEL, 3)) {
58: rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
59: fname, flags);
60: }
61:
62: dlen = strlen(fname);
63: save_filters = push_local_filters(fname, dlen);
64:
65: non_perishable_cnt = 0;
66: dirlist = get_dirlist(fname, dlen, 0);
67: ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
68:
69: if (!dirlist->used)
70: goto done;
71:
72: if (!(flags & DEL_RECURSE)) {
73: ret = DR_NOT_EMPTY;
74: goto done;
75: }
76:
77: p = fname + dlen;
78: if (dlen != 1 || *fname != '/')
79: *p++ = '/';
80: remainder = MAXPATHLEN - (p - fname);
81:
82: /* We do our own recursion, so make delete_item() non-recursive. */
83: flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
84: | DEL_DIR_IS_EMPTY;
85:
86: for (j = dirlist->used; j--; ) {
87: struct file_struct *fp = dirlist->files[j];
88:
89: if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
90: if (DEBUG_GTE(DEL, 1)) {
91: rprintf(FINFO,
92: "mount point, %s, pins parent directory\n",
93: f_name(fp, NULL));
94: }
95: ret = DR_NOT_EMPTY;
96: continue;
97: }
98:
99: strlcpy(p, fp->basename, remainder);
100: if (!(fp->mode & S_IWUSR) && !am_root && fp->flags & FLAG_OWNED_BY_US)
101: do_chmod(fname, fp->mode | S_IWUSR);
102: /* Save stack by recursing to ourself directly. */
103: if (S_ISDIR(fp->mode)) {
104: if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
105: ret = DR_NOT_EMPTY;
106: }
107: if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
108: ret = DR_NOT_EMPTY;
109: }
110:
111: fname[dlen] = '\0';
112:
113: done:
114: flist_free(dirlist);
115: pop_local_filters(save_filters);
116:
117: if (ret == DR_NOT_EMPTY) {
118: rprintf(FINFO, "cannot delete non-empty directory: %s\n",
119: fname);
120: }
121: return ret;
122: }
123:
124: /* Delete a file or directory. If DEL_RECURSE is set in the flags, this will
125: * delete recursively.
126: *
127: * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
128: * a directory! (The buffer is used for recursion, but returned unchanged.)
129: */
130: enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
131: {
132: enum delret ret;
133: char *what;
134: int ok;
135:
136: if (DEBUG_GTE(DEL, 2)) {
137: rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
138: fbuf, (int)mode, (int)flags);
139: }
140:
141: if (flags & DEL_NO_UID_WRITE)
142: do_chmod(fbuf, mode | S_IWUSR);
143:
144: if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
145: /* This only happens on the first call to delete_item() since
146: * delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
147: ignore_perishable = 1;
148: /* If DEL_RECURSE is not set, this just reports emptiness. */
149: ret = delete_dir_contents(fbuf, flags);
150: ignore_perishable = 0;
151: if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
152: goto check_ret;
153: /* OK: try to delete the directory. */
154: }
155:
156: if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && stats.deleted_files >= max_delete) {
157: skipped_deletes++;
158: return DR_AT_LIMIT;
159: }
160:
161: if (S_ISDIR(mode)) {
162: what = "rmdir";
163: ok = do_rmdir(fbuf) == 0;
164: } else {
165: if (make_backups > 0 && !(flags & DEL_FOR_BACKUP) && (backup_dir || !is_backup_file(fbuf))) {
166: what = "make_backup";
167: ok = make_backup(fbuf, True);
168: if (ok == 2) {
169: what = "unlink";
170: ok = robust_unlink(fbuf) == 0;
171: }
172: } else {
173: what = "unlink";
174: ok = robust_unlink(fbuf) == 0;
175: }
176: }
177:
178: if (ok) {
179: if (!(flags & DEL_MAKE_ROOM)) {
180: log_delete(fbuf, mode);
181: stats.deleted_files++;
182: if (S_ISREG(mode)) {
183: /* Nothing more to count */
184: } else if (S_ISDIR(mode))
185: stats.deleted_dirs++;
186: #ifdef SUPPORT_LINKS
187: else if (S_ISLNK(mode))
188: stats.deleted_symlinks++;
189: #endif
190: else if (IS_DEVICE(mode))
191: stats.deleted_symlinks++;
192: else
193: stats.deleted_specials++;
194: }
195: ret = DR_SUCCESS;
196: } else {
197: if (S_ISDIR(mode) && errno == ENOTEMPTY) {
198: rprintf(FINFO, "cannot delete non-empty directory: %s\n",
199: fbuf);
200: ret = DR_NOT_EMPTY;
201: } else if (errno != ENOENT) {
202: rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
203: what, fbuf);
204: ret = DR_FAILURE;
205: } else
206: ret = DR_SUCCESS;
207: }
208:
209: check_ret:
210: if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
211: const char *desc;
212: switch (flags & DEL_MAKE_ROOM) {
213: case DEL_FOR_FILE: desc = "regular file"; break;
214: case DEL_FOR_DIR: desc = "directory"; break;
215: case DEL_FOR_SYMLINK: desc = "symlink"; break;
216: case DEL_FOR_DEVICE: desc = "device file"; break;
217: case DEL_FOR_SPECIAL: desc = "special file"; break;
218: default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
219: }
220: rprintf(FERROR_XFER, "could not make way for %s %s: %s\n",
221: flags & DEL_FOR_BACKUP ? "backup" : "new",
222: desc, fbuf);
223: }
224: return ret;
225: }
226:
227: uint16 get_del_for_flag(uint16 mode)
228: {
229: if (S_ISREG(mode))
230: return DEL_FOR_FILE;
231: if (S_ISDIR(mode))
232: return DEL_FOR_DIR;
233: if (S_ISLNK(mode))
234: return DEL_FOR_SYMLINK;
235: if (IS_DEVICE(mode))
236: return DEL_FOR_DEVICE;
237: if (IS_SPECIAL(mode))
238: return DEL_FOR_SPECIAL;
239: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
240: }
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