Commit | Line | Data |
---|---|---|
addf0c4a | 1 | /* |
0f78b815 WD |
2 | * Backup handling code. |
3 | * | |
4 | * Copyright (C) 1999 Andrew Tridgell | |
b3bf9b9d | 5 | * Copyright (C) 2003-2009 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 | |
3696674b WD |
37 | /* Create a backup path from the given fname, putting the result into |
38 | * backup_dir_buf. Any new directories (compared to the prior backup | |
39 | * path) are ensured to exist as directories, replacing anything else | |
40 | * that may be in the way (e.g. a symlink). */ | |
41 | static BOOL copy_valid_path(const char *fname) | |
378a074c | 42 | { |
3696674b WD |
43 | const char *f; |
44 | int flags; | |
45 | BOOL ret = True; | |
13710874 | 46 | stat_x sx; |
3696674b | 47 | char *b, *rel = backup_dir_buf + backup_dir_len, *name = rel; |
de0e2250 | 48 | |
3696674b WD |
49 | for (f = fname, b = rel; *f && *f == *b; f++, b++) { |
50 | if (*b == '/') | |
51 | name = b + 1; | |
e1ac7791 WD |
52 | } |
53 | ||
3696674b WD |
54 | if (stringjoin(rel, backup_dir_remainder, fname, backup_suffix, NULL) >= backup_dir_remainder) { |
55 | rprintf(FERROR, "backup filename too long\n"); | |
56 | *name = '\0'; | |
57 | return False; | |
58 | } | |
e1ac7791 | 59 | |
3696674b WD |
60 | for ( ; ; name = b + 1) { |
61 | if ((b = strchr(name, '/')) == NULL) | |
62 | return True; | |
63 | *b = '\0'; | |
de0e2250 | 64 | |
3696674b WD |
65 | if (do_lstat(backup_dir_buf, &sx.st) < 0) { |
66 | if (errno == ENOENT) | |
de0e2250 | 67 | break; |
3696674b WD |
68 | rsyserr(FERROR, errno, "backup lstat %s failed", backup_dir_buf); |
69 | *name = '\0'; | |
70 | return False; | |
71 | } | |
72 | if (!S_ISDIR(sx.st.st_mode)) { | |
73 | flags = get_del_for_flag(sx.st.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE; | |
74 | if (delete_item(backup_dir_buf, sx.st.st_mode, flags) == 0) | |
75 | break; | |
76 | *name = '\0'; | |
77 | return False; | |
de0e2250 | 78 | } |
3696674b WD |
79 | |
80 | *b = '/'; | |
47d6a60c | 81 | } |
de0e2250 | 82 | |
3696674b WD |
83 | init_stat_x(&sx); |
84 | ||
85 | for ( ; b; name = b + 1, b = strchr(name, '/')) { | |
86 | *b = '\0'; | |
87 | ||
88 | if (mkdir_defmode(backup_dir_buf) < 0) { | |
89 | rsyserr(FERROR, errno, "backup mkdir %s failed", backup_dir_buf); | |
90 | *name = '\0'; | |
91 | ret = False; | |
92 | break; | |
93 | } | |
94 | ||
95 | /* Try to transfer the directory settings of the actual dir | |
96 | * that the files are coming from. */ | |
97 | if (x_stat(rel, &sx.st, NULL) < 0) | |
98 | rsyserr(FERROR, errno, "backup stat %s failed", full_fname(rel)); | |
99 | else { | |
100 | struct file_struct *file; | |
101 | if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS))) | |
102 | continue; | |
1c3344a1 | 103 | #ifdef SUPPORT_ACLS |
3696674b WD |
104 | if (preserve_acls && !S_ISLNK(file->mode)) { |
105 | get_acl(rel, &sx); | |
106 | cache_tmp_acl(file, &sx); | |
107 | free_acl(&sx); | |
108 | } | |
1e999f9f | 109 | #endif |
16edf865 | 110 | #ifdef SUPPORT_XATTRS |
3696674b WD |
111 | if (preserve_xattrs) { |
112 | get_xattr(rel, &sx); | |
113 | cache_tmp_xattr(file, &sx); | |
114 | free_xattr(&sx); | |
115 | } | |
16edf865 | 116 | #endif |
3696674b WD |
117 | set_file_attrs(backup_dir_buf, file, NULL, NULL, 0); |
118 | unmake_file(file); | |
119 | } | |
120 | ||
121 | *b = '/'; | |
122 | } | |
123 | ||
cb197514 | 124 | #ifdef SUPPORT_ACLS |
3696674b | 125 | uncache_tmp_acls(); |
cb197514 WD |
126 | #endif |
127 | #ifdef SUPPORT_XATTRS | |
3696674b | 128 | uncache_tmp_xattrs(); |
cb197514 | 129 | #endif |
3696674b WD |
130 | |
131 | return ret; | |
132 | } | |
133 | ||
134 | /* Make a complete pathname for backup file and verify any new path elements. */ | |
135 | char *get_backup_name(const char *fname) | |
136 | { | |
137 | if (backup_dir) { | |
138 | /* copy fname into backup_dir_buf while validating the dirs. */ | |
139 | if (copy_valid_path(fname)) | |
140 | return backup_dir_buf; | |
141 | return NULL; | |
142 | } else { | |
143 | if (stringjoin(backup_dir_buf, MAXPATHLEN, | |
144 | fname, backup_suffix, NULL) < MAXPATHLEN) | |
145 | return backup_dir_buf; | |
47d6a60c | 146 | } |
de0e2250 | 147 | |
3696674b WD |
148 | rprintf(FERROR, "backup filename too long\n"); |
149 | return NULL; | |
378a074c AT |
150 | } |
151 | ||
21cddef2 WD |
152 | /* Has same return codes as make_backup(). */ |
153 | static inline int link_or_rename(const char *from, const char *to, | |
154 | BOOL prefer_rename, STRUCT_STAT *stp) | |
66203a98 | 155 | { |
d735fe20 WD |
156 | #ifdef SUPPORT_HARD_LINKS |
157 | if (!prefer_rename) { | |
21cddef2 | 158 | #ifndef CAN_HARDLINK_SYMLINK |
d735fe20 WD |
159 | if (S_ISLNK(stp->st_mode)) |
160 | return 0; /* Use copy code. */ | |
21cddef2 | 161 | #endif |
21cddef2 | 162 | #ifndef CAN_HARDLINK_SPECIAL |
d735fe20 WD |
163 | if (IS_SPECIAL(stp->st_mode) || IS_DEVICE(stp->st_mode)) |
164 | return 0; /* Use copy code. */ | |
21cddef2 | 165 | #endif |
3696674b WD |
166 | if (do_link(from, to) == 0) { |
167 | if (DEBUG_GTE(BACKUP, 1)) | |
168 | rprintf(FINFO, "make_backup: HLINK %s successful.\n", from); | |
5e2d51ee | 169 | return 2; |
3696674b | 170 | } |
5e2d51ee WD |
171 | /* We prefer to rename a regular file rather than copy it. */ |
172 | if (!S_ISREG(stp->st_mode) || errno == EEXIST || errno == EISDIR) | |
d735fe20 | 173 | return 0; |
21cddef2 WD |
174 | } |
175 | #endif | |
21cddef2 WD |
176 | if (do_rename(from, to) == 0) { |
177 | if (stp->st_nlink > 1 && !S_ISDIR(stp->st_mode)) { | |
178 | /* If someone has hard-linked the file into the backup | |
179 | * dir, rename() might return success but do nothing! */ | |
5e2d51ee | 180 | robust_unlink(from); /* Just in case... */ |
f1ca7c44 | 181 | } |
3696674b WD |
182 | if (DEBUG_GTE(BACKUP, 1)) |
183 | rprintf(FINFO, "make_backup: RENAME %s successful.\n", from); | |
21cddef2 | 184 | return 1; |
f1ca7c44 | 185 | } |
62c9e6b3 | 186 | return 0; |
de0e2250 | 187 | } |
66203a98 | 188 | |
21cddef2 WD |
189 | /* Hard-link, rename, or copy an item to the backup name. Returns 2 if item |
190 | * was duplicated into backup area, 1 if item was moved, or 0 for failure.*/ | |
191 | int make_backup(const char *fname, BOOL prefer_rename) | |
66203a98 | 192 | { |
13710874 | 193 | stat_x sx; |
66203a98 | 194 | struct file_struct *file; |
21cddef2 WD |
195 | int save_preserve_xattrs; |
196 | char *buf = get_backup_name(fname); | |
197 | int ret = 0; | |
198 | ||
199 | if (!buf) | |
200 | return 0; | |
378a074c | 201 | |
09ca0d15 WD |
202 | init_stat_x(&sx); |
203 | /* Return success if no file to keep. */ | |
9439c0cb | 204 | if (x_lstat(fname, &sx.st, NULL) < 0) |
9fd62d15 | 205 | return 1; |
66203a98 | 206 | |
21cddef2 WD |
207 | /* Try a hard-link or a rename first. Using rename is not atomic, but |
208 | * is more efficient than forcing a copy for larger files when no hard- | |
209 | * linking is possible. */ | |
210 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
211 | goto success; | |
d735fe20 | 212 | if (errno == EEXIST || errno == EISDIR) { |
21cddef2 WD |
213 | STRUCT_STAT bakst; |
214 | if (do_lstat(buf, &bakst) == 0) { | |
215 | int flags = get_del_for_flag(bakst.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE; | |
216 | if (delete_item(buf, bakst.st_mode, flags) != 0) | |
217 | return 0; | |
218 | } | |
219 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
220 | goto success; | |
82ad07c4 | 221 | } |
378a074c | 222 | |
21cddef2 WD |
223 | /* Fall back to making a copy. */ |
224 | if (!(file = make_file(fname, NULL, &sx.st, 0, NO_FILTERS))) | |
225 | return 1; /* the file could have disappeared */ | |
226 | ||
1c3344a1 WD |
227 | #ifdef SUPPORT_ACLS |
228 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
229 | get_acl(fname, &sx); | |
cb197514 | 230 | cache_tmp_acl(file, &sx); |
1c3344a1 WD |
231 | free_acl(&sx); |
232 | } | |
233 | #endif | |
16edf865 WD |
234 | #ifdef SUPPORT_XATTRS |
235 | if (preserve_xattrs) { | |
236 | get_xattr(fname, &sx); | |
cb197514 | 237 | cache_tmp_xattr(file, &sx); |
16edf865 WD |
238 | free_xattr(&sx); |
239 | } | |
240 | #endif | |
1c3344a1 | 241 | |
378a074c | 242 | /* Check to see if this is a device file, or link */ |
b5c6a6ae WD |
243 | if ((am_root && preserve_devices && IS_DEVICE(file->mode)) |
244 | || (preserve_specials && IS_SPECIAL(file->mode))) { | |
3696674b WD |
245 | if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) |
246 | rsyserr(FERROR, errno, "mknod %s failed", full_fname(buf)); | |
247 | else if (DEBUG_GTE(BACKUP, 1)) | |
248 | rprintf(FINFO, "make_backup: DEVICE %s successful.\n", fname); | |
21cddef2 | 249 | ret = 2; |
47d6a60c | 250 | } |
378a074c | 251 | |
4f5b0756 | 252 | #ifdef SUPPORT_LINKS |
21cddef2 | 253 | if (!ret && preserve_links && S_ISLNK(file->mode)) { |
82ad07c4 | 254 | const char *sl = F_SYMLINK(file); |
e6f3a33c | 255 | if (safe_symlinks && unsafe_symlink(sl, fname)) { |
951e826b | 256 | if (INFO_GTE(SYMSAFE, 1)) { |
47d6a60c | 257 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", |
82ad07c4 | 258 | full_fname(buf), sl); |
47d6a60c | 259 | } |
21cddef2 | 260 | ret = 2; |
93e28fbd | 261 | } else { |
3696674b WD |
262 | if (do_symlink(sl, buf) < 0) |
263 | rsyserr(FERROR, errno, "link %s -> \"%s\"", full_fname(buf), sl); | |
264 | else if (DEBUG_GTE(BACKUP, 1)) | |
265 | rprintf(FINFO, "make_backup: SYMLINK %s successful.\n", fname); | |
21cddef2 | 266 | ret = 2; |
47d6a60c | 267 | } |
47d6a60c | 268 | } |
378a074c | 269 | #endif |
378a074c | 270 | |
21cddef2 | 271 | if (!ret && !S_ISREG(file->mode)) { |
3696674b | 272 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", fname); |
82ad07c4 | 273 | unmake_file(file); |
cb197514 WD |
274 | #ifdef SUPPORT_ACLS |
275 | uncache_tmp_acls(); | |
276 | #endif | |
277 | #ifdef SUPPORT_XATTRS | |
278 | uncache_tmp_xattrs(); | |
279 | #endif | |
21cddef2 | 280 | return 2; |
47d6a60c | 281 | } |
66203a98 | 282 | |
21cddef2 WD |
283 | /* Copy to backup tree if a file. */ |
284 | if (!ret) { | |
3696674b | 285 | if (copy_file(fname, buf, -1, file->mode) < 0) { |
d62bcc17 | 286 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
45c49b52 | 287 | full_fname(fname), buf); |
21cddef2 | 288 | unmake_file(file); |
cb197514 WD |
289 | #ifdef SUPPORT_ACLS |
290 | uncache_tmp_acls(); | |
291 | #endif | |
292 | #ifdef SUPPORT_XATTRS | |
293 | uncache_tmp_xattrs(); | |
294 | #endif | |
21cddef2 | 295 | return 0; |
47d6a60c | 296 | } |
3696674b WD |
297 | if (DEBUG_GTE(BACKUP, 1)) |
298 | rprintf(FINFO, "make_backup: COPY %s successful.\n", fname); | |
21cddef2 | 299 | ret = 2; |
47d6a60c | 300 | } |
21cddef2 WD |
301 | |
302 | save_preserve_xattrs = preserve_xattrs; | |
e9489cd6 | 303 | preserve_xattrs = 0; |
16edf865 | 304 | set_file_attrs(buf, file, NULL, fname, 0); |
e9489cd6 | 305 | preserve_xattrs = save_preserve_xattrs; |
21cddef2 | 306 | |
82ad07c4 | 307 | unmake_file(file); |
cb197514 WD |
308 | #ifdef SUPPORT_ACLS |
309 | uncache_tmp_acls(); | |
310 | #endif | |
311 | #ifdef SUPPORT_XATTRS | |
312 | uncache_tmp_xattrs(); | |
313 | #endif | |
378a074c | 314 | |
21cddef2 | 315 | success: |
3696674b WD |
316 | if (INFO_GTE(BACKUP, 1)) |
317 | rprintf(FINFO, "backed up %s to %s\n", fname, buf); | |
21cddef2 | 318 | return ret; |
66203a98 | 319 | } |