Commit | Line | Data |
---|---|---|
addf0c4a | 1 | /* |
0f78b815 WD |
2 | * Backup handling code. |
3 | * | |
4 | * Copyright (C) 1999 Andrew Tridgell | |
d3d07a5e | 5 | * Copyright (C) 2003-2008 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 3 of the License, or | |
10 | * (at your option) any later version. | |
0f78b815 WD |
11 | * |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
e7c67065 | 17 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 18 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 19 | */ |
3d19b4c8 AT |
20 | |
21 | #include "rsync.h" | |
09ca0d15 | 22 | #include "ifuncs.h" |
3d19b4c8 | 23 | |
378a074c | 24 | extern int am_root; |
1c3344a1 | 25 | extern int preserve_acls; |
16edf865 | 26 | extern int preserve_xattrs; |
378a074c | 27 | extern int preserve_devices; |
b5c6a6ae | 28 | extern int preserve_specials; |
378a074c | 29 | extern int preserve_links; |
377dbd20 | 30 | extern int safe_symlinks; |
6b2a3d5d | 31 | extern int backup_dir_len; |
82ad07c4 WD |
32 | extern unsigned int backup_dir_remainder; |
33 | extern char backup_dir_buf[MAXPATHLEN]; | |
34 | extern char *backup_suffix; | |
35 | extern char *backup_dir; | |
378a074c | 36 | |
c94e4afb | 37 | /* make a complete pathname for backup file */ |
45d8bfe0 | 38 | char *get_backup_name(const char *fname) |
c94e4afb | 39 | { |
c94e4afb WD |
40 | if (backup_dir) { |
41 | if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder, | |
42 | fname, backup_suffix, NULL) < backup_dir_remainder) | |
43 | return backup_dir_buf; | |
44 | } else { | |
fb22c277 WD |
45 | if (stringjoin(backup_dir_buf, MAXPATHLEN, |
46 | fname, backup_suffix, NULL) < MAXPATHLEN) | |
47 | return backup_dir_buf; | |
c94e4afb WD |
48 | } |
49 | ||
50 | rprintf(FERROR, "backup filename too long\n"); | |
51 | return NULL; | |
52 | } | |
53 | ||
66203a98 | 54 | /* simple backup creates a backup with a suffix in the same directory */ |
45d8bfe0 | 55 | static int make_simple_backup(const char *fname) |
3d19b4c8 | 56 | { |
ba679d51 | 57 | int rename_errno; |
45d8bfe0 | 58 | const char *fnamebak = get_backup_name(fname); |
5d2a7071 | 59 | |
c94e4afb | 60 | if (!fnamebak) |
3d19b4c8 | 61 | return 0; |
3d19b4c8 | 62 | |
ba679d51 WD |
63 | while (1) { |
64 | if (do_rename(fname, fnamebak) == 0) { | |
951e826b | 65 | if (INFO_GTE(BACKUP, 1)) { |
ba679d51 | 66 | rprintf(FINFO, "backed up %s to %s\n", |
45c49b52 | 67 | fname, fnamebak); |
ba679d51 WD |
68 | } |
69 | break; | |
3d19b4c8 | 70 | } |
ba679d51 WD |
71 | /* cygwin (at least version b19) reports EINVAL */ |
72 | if (errno == ENOENT || errno == EINVAL) | |
73 | break; | |
74 | ||
75 | rename_errno = errno; | |
76 | if (errno == EISDIR && do_rmdir(fnamebak) == 0) | |
77 | continue; | |
78 | if (errno == ENOTDIR && do_unlink(fnamebak) == 0) | |
79 | continue; | |
80 | ||
81 | rsyserr(FERROR, rename_errno, "rename %s to backup %s", | |
45c49b52 | 82 | fname, fnamebak); |
ba679d51 WD |
83 | errno = rename_errno; |
84 | return 0; | |
3d19b4c8 | 85 | } |
ba679d51 | 86 | |
3d19b4c8 AT |
87 | return 1; |
88 | } | |
66203a98 AT |
89 | |
90 | ||
378a074c AT |
91 | /**************************************************************************** |
92 | Create a directory given an absolute path, perms based upon another directory | |
93 | path | |
94 | ****************************************************************************/ | |
e1ac7791 | 95 | int make_bak_dir(const char *fullpath) |
378a074c | 96 | { |
e1ac7791 | 97 | char fbuf[MAXPATHLEN], *rel, *end, *p; |
1c3344a1 | 98 | struct file_struct *file; |
e1ac7791 | 99 | int len = backup_dir_len; |
13710874 | 100 | stat_x sx; |
de0e2250 | 101 | |
e1ac7791 | 102 | while (*fullpath == '.' && fullpath[1] == '/') { |
de0e2250 | 103 | fullpath += 2; |
e1ac7791 WD |
104 | len -= 2; |
105 | } | |
106 | ||
107 | if (strlcpy(fbuf, fullpath, sizeof fbuf) >= sizeof fbuf) | |
108 | return -1; | |
109 | ||
110 | rel = fbuf + len; | |
111 | end = p = rel + strlen(rel); | |
de0e2250 WD |
112 | |
113 | /* Try to find an existing dir, starting from the deepest dir. */ | |
114 | while (1) { | |
e1ac7791 WD |
115 | if (--p == fbuf) |
116 | return -1; | |
de0e2250 WD |
117 | if (*p == '/') { |
118 | *p = '\0'; | |
e1ac7791 | 119 | if (mkdir_defmode(fbuf) == 0) |
de0e2250 WD |
120 | break; |
121 | if (errno != ENOENT) { | |
d62bcc17 WD |
122 | rsyserr(FERROR, errno, |
123 | "make_bak_dir mkdir %s failed", | |
e1ac7791 WD |
124 | full_fname(fbuf)); |
125 | return -1; | |
de0e2250 WD |
126 | } |
127 | } | |
47d6a60c | 128 | } |
de0e2250 WD |
129 | |
130 | /* Make all the dirs that we didn't find on the way here. */ | |
131 | while (1) { | |
132 | if (p >= rel) { | |
133 | /* Try to transfer the directory settings of the | |
134 | * actual dir that the files are coming from. */ | |
09ca0d15 | 135 | init_stat_x(&sx); |
9439c0cb | 136 | if (x_stat(rel, &sx.st, NULL) < 0) { |
d62bcc17 WD |
137 | rsyserr(FERROR, errno, |
138 | "make_bak_dir stat %s failed", | |
139 | full_fname(rel)); | |
de0e2250 | 140 | } else { |
1c3344a1 WD |
141 | if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS))) |
142 | continue; | |
143 | #ifdef SUPPORT_ACLS | |
144 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
145 | get_acl(rel, &sx); | |
146 | cache_acl(file, &sx); | |
147 | free_acl(&sx); | |
148 | } | |
1e999f9f | 149 | #endif |
16edf865 WD |
150 | #ifdef SUPPORT_XATTRS |
151 | if (preserve_xattrs) { | |
152 | get_xattr(rel, &sx); | |
153 | cache_xattr(file, &sx); | |
154 | free_xattr(&sx); | |
155 | } | |
156 | #endif | |
e1ac7791 | 157 | set_file_attrs(fbuf, file, NULL, NULL, 0); |
b13505da | 158 | unmake_file(file); |
47d6a60c S |
159 | } |
160 | } | |
de0e2250 WD |
161 | *p = '/'; |
162 | p += strlen(p); | |
163 | if (p == end) | |
164 | break; | |
e1ac7791 | 165 | if (mkdir_defmode(fbuf) < 0) { |
d62bcc17 | 166 | rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed", |
e1ac7791 WD |
167 | full_fname(fbuf)); |
168 | return -1; | |
de0e2250 | 169 | } |
47d6a60c | 170 | } |
de0e2250 | 171 | |
e1ac7791 | 172 | return 0; |
378a074c AT |
173 | } |
174 | ||
66203a98 | 175 | /* robustly move a file, creating new directory structures if necessary */ |
45d8bfe0 | 176 | static int robust_move(const char *src, char *dst) |
66203a98 | 177 | { |
f1ca7c44 WD |
178 | if (robust_rename(src, dst, NULL, 0755) < 0) { |
179 | int save_errno = errno ? errno : EINVAL; /* 0 paranoia */ | |
180 | if (errno == ENOENT && make_bak_dir(dst) == 0) { | |
181 | if (robust_rename(src, dst, NULL, 0755) < 0) | |
182 | save_errno = errno ? errno : save_errno; | |
183 | else | |
184 | save_errno = 0; | |
185 | } | |
186 | if (save_errno) { | |
187 | errno = save_errno; | |
188 | return -1; | |
189 | } | |
190 | } | |
62c9e6b3 | 191 | return 0; |
de0e2250 | 192 | } |
66203a98 AT |
193 | |
194 | ||
de0e2250 WD |
195 | /* If we have a --backup-dir, then we get here from make_backup(). |
196 | * We will move the file to be deleted into a parallel directory tree. */ | |
45d8bfe0 | 197 | static int keep_backup(const char *fname) |
66203a98 | 198 | { |
13710874 | 199 | stat_x sx; |
66203a98 | 200 | struct file_struct *file; |
c94e4afb | 201 | char *buf; |
e9489cd6 | 202 | int save_preserve_xattrs = preserve_xattrs; |
47d6a60c | 203 | int kept = 0; |
378a074c AT |
204 | int ret_code; |
205 | ||
09ca0d15 WD |
206 | init_stat_x(&sx); |
207 | /* Return success if no file to keep. */ | |
9439c0cb | 208 | if (x_lstat(fname, &sx.st, NULL) < 0) |
9fd62d15 | 209 | return 1; |
66203a98 | 210 | |
3de73827 | 211 | if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) |
c94e4afb | 212 | return 1; /* the file could have disappeared */ |
66203a98 | 213 | |
82ad07c4 WD |
214 | if (!(buf = get_backup_name(fname))) { |
215 | unmake_file(file); | |
47d6a60c | 216 | return 0; |
82ad07c4 | 217 | } |
378a074c | 218 | |
1c3344a1 WD |
219 | #ifdef SUPPORT_ACLS |
220 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
221 | get_acl(fname, &sx); | |
222 | cache_acl(file, &sx); | |
223 | free_acl(&sx); | |
224 | } | |
225 | #endif | |
16edf865 WD |
226 | #ifdef SUPPORT_XATTRS |
227 | if (preserve_xattrs) { | |
228 | get_xattr(fname, &sx); | |
229 | cache_xattr(file, &sx); | |
230 | free_xattr(&sx); | |
231 | } | |
232 | #endif | |
1c3344a1 | 233 | |
378a074c | 234 | /* Check to see if this is a device file, or link */ |
b5c6a6ae WD |
235 | if ((am_root && preserve_devices && IS_DEVICE(file->mode)) |
236 | || (preserve_specials && IS_SPECIAL(file->mode))) { | |
88e05f84 | 237 | int save_errno; |
93e28fbd | 238 | do_unlink(buf); |
a64f19e2 | 239 | if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) { |
88e05f84 | 240 | save_errno = errno ? errno : EINVAL; /* 0 paranoia */ |
f1ca7c44 | 241 | if (errno == ENOENT && make_bak_dir(buf) == 0) { |
a64f19e2 | 242 | if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) |
f1ca7c44 WD |
243 | save_errno = errno ? errno : save_errno; |
244 | else | |
245 | save_errno = 0; | |
246 | } | |
247 | if (save_errno) { | |
248 | rsyserr(FERROR, save_errno, "mknod %s failed", | |
249 | full_fname(buf)); | |
250 | } | |
88e05f84 WD |
251 | } else |
252 | save_errno = 0; | |
951e826b | 253 | if (DEBUG_GTE(BACKUP, 1) && save_errno == 0) { |
93e28fbd | 254 | rprintf(FINFO, "make_backup: DEVICE %s successful.\n", |
45c49b52 | 255 | fname); |
47d6a60c S |
256 | } |
257 | kept = 1; | |
258 | do_unlink(fname); | |
259 | } | |
378a074c | 260 | |
addf0c4a | 261 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 262 | /* make an empty directory */ |
f1ca7c44 WD |
263 | if (do_mkdir(buf, file->mode) < 0) { |
264 | int save_errno = errno ? errno : EINVAL; /* 0 paranoia */ | |
265 | if (errno == ENOENT && make_bak_dir(buf) == 0) { | |
266 | if (do_mkdir(buf, file->mode) < 0) | |
267 | save_errno = errno ? errno : save_errno; | |
268 | else | |
269 | save_errno = 0; | |
270 | } | |
271 | if (save_errno) { | |
272 | rsyserr(FINFO, save_errno, "mkdir %s failed", | |
273 | full_fname(buf)); | |
274 | } | |
377dbd20 | 275 | } |
47d6a60c | 276 | |
377dbd20 | 277 | ret_code = do_rmdir(fname); |
951e826b | 278 | if (DEBUG_GTE(BACKUP, 1)) { |
ea42541f WD |
279 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
280 | full_fname(fname), ret_code); | |
47d6a60c S |
281 | } |
282 | kept = 1; | |
283 | } | |
378a074c | 284 | |
4f5b0756 | 285 | #ifdef SUPPORT_LINKS |
addf0c4a | 286 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
82ad07c4 WD |
287 | const char *sl = F_SYMLINK(file); |
288 | if (safe_symlinks && unsafe_symlink(sl, buf)) { | |
951e826b | 289 | if (INFO_GTE(SYMSAFE, 1)) { |
47d6a60c | 290 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", |
82ad07c4 | 291 | full_fname(buf), sl); |
47d6a60c S |
292 | } |
293 | kept = 1; | |
93e28fbd WD |
294 | } else { |
295 | do_unlink(buf); | |
f1ca7c44 WD |
296 | if (do_symlink(sl, buf) < 0) { |
297 | int save_errno = errno ? errno : EINVAL; /* 0 paranoia */ | |
298 | if (errno == ENOENT && make_bak_dir(buf) == 0) { | |
299 | if (do_symlink(sl, buf) < 0) | |
300 | save_errno = errno ? errno : save_errno; | |
301 | else | |
302 | save_errno = 0; | |
303 | } | |
304 | if (save_errno) { | |
305 | rsyserr(FERROR, save_errno, "link %s -> \"%s\"", | |
306 | full_fname(buf), sl); | |
307 | } | |
93e28fbd WD |
308 | } |
309 | do_unlink(fname); | |
310 | kept = 1; | |
47d6a60c | 311 | } |
47d6a60c | 312 | } |
378a074c | 313 | #endif |
378a074c | 314 | |
addf0c4a | 315 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 316 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
45c49b52 | 317 | fname); |
82ad07c4 | 318 | unmake_file(file); |
f8c8ef9e | 319 | return 1; |
47d6a60c | 320 | } |
66203a98 | 321 | |
66203a98 | 322 | /* move to keep tree if a file */ |
addf0c4a | 323 | if (!kept) { |
c94e4afb | 324 | if (robust_move(fname, buf) != 0) { |
d62bcc17 | 325 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
45c49b52 | 326 | full_fname(fname), buf); |
1c3344a1 | 327 | } else if (sx.st.st_nlink > 1) { |
394bcdb5 | 328 | /* If someone has hard-linked the file into the backup |
3cb22c20 | 329 | * dir, rename() might return success but do nothing! */ |
394bcdb5 | 330 | robust_unlink(fname); /* Just in case... */ |
47d6a60c S |
331 | } |
332 | } | |
e9489cd6 | 333 | preserve_xattrs = 0; |
16edf865 | 334 | set_file_attrs(buf, file, NULL, fname, 0); |
e9489cd6 | 335 | preserve_xattrs = save_preserve_xattrs; |
82ad07c4 | 336 | unmake_file(file); |
378a074c | 337 | |
951e826b | 338 | if (INFO_GTE(BACKUP, 1)) { |
4875d6b6 | 339 | rprintf(FINFO, "backed up %s to %s\n", |
45c49b52 | 340 | fname, buf); |
4875d6b6 | 341 | } |
66203a98 | 342 | return 1; |
de0e2250 | 343 | } |
66203a98 AT |
344 | |
345 | ||
346 | /* main backup switch routine */ | |
45d8bfe0 | 347 | int make_backup(const char *fname) |
66203a98 AT |
348 | { |
349 | if (backup_dir) | |
addf0c4a WD |
350 | return keep_backup(fname); |
351 | return make_simple_backup(fname); | |
66203a98 | 352 | } |