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) 2003-2020 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 int detect_renamed;
29: extern char *backup_dir;
30: extern char *backup_suffix;
31: extern int backup_suffix_len;
32: extern char *backup_dir_dels;
33: extern char *backup_suffix_dels;
34: extern int backup_suffix_dels_len;
35: extern struct stats stats;
36:
37: int ignore_perishable = 0;
38: int non_perishable_cnt = 0;
39: int skipped_deletes = 0;
40:
41: /* Function now compares both backup_suffix and backup_suffix_dels. */
42: static inline int is_backup_file(char *fn)
43: {
44: int k = strlen(fn) - backup_suffix_len;
45: if (k > 0 && strcmp(fn+k, backup_suffix) == 0)
46: return 1;
47: k += backup_suffix_len - backup_suffix_dels_len;
48: return k > 0 && strcmp(fn+k, backup_suffix_dels) == 0;
49: }
50:
51: /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
52: * its contents, otherwise just checks for content. Returns DR_SUCCESS or
53: * DR_NOT_EMPTY. Note that fname must point to a MAXPATHLEN buffer! (The
54: * buffer is used for recursion, but returned unchanged.)
55: *
56: * Note: --detect-rename may use this routine with DEL_NO_DELETIONS set!
57: */
58: static enum delret delete_dir_contents(char *fname, uint16 flags)
59: {
60: struct file_list *dirlist;
61: enum delret ret;
62: unsigned remainder;
63: void *save_filters;
64: int j, dlen;
65: char *p;
66:
67: if (DEBUG_GTE(DEL, 3)) {
68: rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
69: fname, flags);
70: }
71:
72: dlen = strlen(fname);
73: save_filters = push_local_filters(fname, dlen);
74:
75: non_perishable_cnt = 0;
76: file_extra_cnt += SUM_EXTRA_CNT;
77: dirlist = get_dirlist(fname, dlen, 0);
78: file_extra_cnt -= SUM_EXTRA_CNT;
79: ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
80:
81: if (!dirlist->used)
82: goto done;
83:
84: if (!(flags & DEL_RECURSE)) {
85: ret = DR_NOT_EMPTY;
86: goto done;
87: }
88:
89: p = fname + dlen;
90: if (dlen != 1 || *fname != '/')
91: *p++ = '/';
92: remainder = MAXPATHLEN - (p - fname);
93:
94: /* We do our own recursion, so make delete_item() non-recursive. */
95: flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
96: | DEL_DIR_IS_EMPTY;
97:
98: for (j = dirlist->used; j--; ) {
99: struct file_struct *fp = dirlist->files[j];
100:
101: if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
102: if (DEBUG_GTE(DEL, 1)) {
103: rprintf(FINFO,
104: "mount point, %s, pins parent directory\n",
105: f_name(fp, NULL));
106: }
107: ret = DR_NOT_EMPTY;
108: continue;
109: }
110:
111: strlcpy(p, fp->basename, remainder);
112: #ifdef SUPPORT_FORCE_CHANGE
113: if (force_change)
114: make_mutable(fname, fp->mode, F_FFLAGS(fp), force_change);
115: #endif
116: if (!(fp->mode & S_IWUSR) && !am_root && fp->flags & FLAG_OWNED_BY_US)
117: do_chmod(fname, fp->mode | S_IWUSR, NO_FFLAGS);
118: /* Save stack by recursing to ourself directly. */
119: if (S_ISDIR(fp->mode)) {
120: if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
121: ret = DR_NOT_EMPTY;
122: } else if (detect_renamed && S_ISREG(fp->mode))
123: look_for_rename(fp, fname);
124: if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
125: ret = DR_NOT_EMPTY;
126: }
127:
128: fname[dlen] = '\0';
129:
130: done:
131: flist_free(dirlist);
132: pop_local_filters(save_filters);
133:
134: if (ret == DR_NOT_EMPTY) {
135: rprintf(FINFO, "cannot delete non-empty directory: %s\n",
136: fname);
137: }
138: return ret;
139: }
140:
141: /* Delete a file or directory. If DEL_RECURSE is set in the flags, this will
142: * delete recursively.
143: *
144: * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
145: * a directory! (The buffer is used for recursion, but returned unchanged.)
146: *
147: * Also note: --detect-rename may use this routine with DEL_NO_DELETIONS set!
148: */
149: enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
150: {
151: enum delret ret;
152: char *what;
153: int ok;
154:
155: if (DEBUG_GTE(DEL, 2)) {
156: rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
157: fbuf, (int)mode, (int)flags);
158: }
159:
160: if (flags & DEL_NO_UID_WRITE)
161: do_chmod(fbuf, mode | S_IWUSR, NO_FFLAGS);
162:
163: if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
164: /* This only happens on the first call to delete_item() since
165: * delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
166: #ifdef SUPPORT_FORCE_CHANGE
167: if (force_change) {
168: STRUCT_STAT st;
169: if (x_lstat(fbuf, &st, NULL) == 0)
170: make_mutable(fbuf, st.st_mode, st.st_flags, force_change);
171: }
172: #endif
173: ignore_perishable = 1;
174: /* If DEL_RECURSE is not set, this just reports emptiness. */
175: ret = delete_dir_contents(fbuf, flags);
176: ignore_perishable = 0;
177: if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
178: goto check_ret;
179: /* OK: try to delete the directory. */
180: }
181:
182: if (flags & DEL_NO_DELETIONS)
183: return DR_SUCCESS;
184:
185: if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && stats.deleted_files >= max_delete) {
186: skipped_deletes++;
187: return DR_AT_LIMIT;
188: }
189:
190: if (S_ISDIR(mode)) {
191: what = "rmdir";
192: ok = do_rmdir(fbuf) == 0;
193: } else {
194: if (make_backups > 0 && !(flags & DEL_FOR_BACKUP) && (backup_dir_dels || !is_backup_file(fbuf))) {
195: what = "make_backup";
196: ok = safe_delete(fbuf);
197: if (ok == 2) {
198: what = "unlink";
199: ok = robust_unlink(fbuf) == 0;
200: }
201: } else {
202: what = "unlink";
203: ok = robust_unlink(fbuf) == 0;
204: }
205: }
206:
207: if (ok) {
208: if (!(flags & DEL_MAKE_ROOM)) {
209: log_delete(fbuf, mode);
210: stats.deleted_files++;
211: if (S_ISREG(mode)) {
212: /* Nothing more to count */
213: } else if (S_ISDIR(mode))
214: stats.deleted_dirs++;
215: #ifdef SUPPORT_LINKS
216: else if (S_ISLNK(mode))
217: stats.deleted_symlinks++;
218: #endif
219: else if (IS_DEVICE(mode))
220: stats.deleted_symlinks++;
221: else
222: stats.deleted_specials++;
223: }
224: ret = DR_SUCCESS;
225: } else {
226: if (S_ISDIR(mode) && errno == ENOTEMPTY) {
227: rprintf(FINFO, "cannot delete non-empty directory: %s\n",
228: fbuf);
229: ret = DR_NOT_EMPTY;
230: } else if (errno != ENOENT) {
231: rsyserr(FERROR_XFER, errno, "delete_file: %s(%s) failed",
232: what, fbuf);
233: ret = DR_FAILURE;
234: } else
235: ret = DR_SUCCESS;
236: }
237:
238: check_ret:
239: if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
240: const char *desc;
241: switch (flags & DEL_MAKE_ROOM) {
242: case DEL_FOR_FILE: desc = "regular file"; break;
243: case DEL_FOR_DIR: desc = "directory"; break;
244: case DEL_FOR_SYMLINK: desc = "symlink"; break;
245: case DEL_FOR_DEVICE: desc = "device file"; break;
246: case DEL_FOR_SPECIAL: desc = "special file"; break;
247: default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
248: }
249: rprintf(FERROR_XFER, "could not make way for %s %s: %s\n",
250: flags & DEL_FOR_BACKUP ? "backup" : "new",
251: desc, fbuf);
252: }
253: return ret;
254: }
255:
256: uint16 get_del_for_flag(uint16 mode)
257: {
258: if (S_ISREG(mode))
259: return DEL_FOR_FILE;
260: if (S_ISDIR(mode))
261: return DEL_FOR_DIR;
262: if (S_ISLNK(mode))
263: return DEL_FOR_SYMLINK;
264: if (IS_DEVICE(mode))
265: return DEL_FOR_DEVICE;
266: if (IS_SPECIAL(mode))
267: return DEL_FOR_SPECIAL;
268: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
269: }
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