Commit | Line | Data |
---|---|---|
addf0c4a | 1 | /* |
3d19b4c8 | 2 | Copyright (C) Andrew Tridgell 1999 |
addf0c4a | 3 | |
3d19b4c8 AT |
4 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 2 of the License, or | |
7 | (at your option) any later version. | |
addf0c4a | 8 | |
3d19b4c8 AT |
9 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
addf0c4a | 13 | |
3d19b4c8 AT |
14 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
17 | */ | |
18 | ||
19 | /* backup handling code */ | |
20 | ||
21 | #include "rsync.h" | |
22 | ||
23 | extern int verbose; | |
daa8ce83 WD |
24 | extern int backup_suffix_len; |
25 | extern int backup_dir_len; | |
3d19b4c8 | 26 | extern char *backup_suffix; |
66203a98 | 27 | extern char *backup_dir; |
91a1e147 | 28 | extern struct file_struct **hlink_list; |
3d19b4c8 | 29 | |
378a074c AT |
30 | extern int am_root; |
31 | extern int preserve_devices; | |
32 | extern int preserve_links; | |
33 | extern int preserve_hard_links; | |
5d2a7071 | 34 | extern int orig_umask; |
378a074c | 35 | |
66203a98 AT |
36 | /* simple backup creates a backup with a suffix in the same directory */ |
37 | static int make_simple_backup(char *fname) | |
3d19b4c8 AT |
38 | { |
39 | char fnamebak[MAXPATHLEN]; | |
5d2a7071 WD |
40 | |
41 | if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL) | |
42 | >= sizeof fnamebak) { | |
47d6a60c | 43 | rprintf(FERROR, "backup filename too long\n"); |
3d19b4c8 AT |
44 | return 0; |
45 | } | |
46 | ||
47d6a60c | 47 | if (do_rename(fname, fnamebak) != 0) { |
3d19b4c8 AT |
48 | /* cygwin (at least version b19) reports EINVAL */ |
49 | if (errno != ENOENT && errno != EINVAL) { | |
a039749b | 50 | rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak); |
3d19b4c8 AT |
51 | return 0; |
52 | } | |
53 | } else if (verbose > 1) { | |
47d6a60c | 54 | rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak); |
3d19b4c8 AT |
55 | } |
56 | return 1; | |
57 | } | |
66203a98 AT |
58 | |
59 | ||
60 | /* recursively make a directory path */ | |
61 | static int make_dir(char *name, int mask) | |
62 | { | |
63 | char newdir [MAXPATHLEN]; | |
64 | char *p, *d; | |
65 | ||
66 | /* copy pathname over, look for last '/' */ | |
67 | for (p = d = newdir; *name; *d++ = *name++) | |
68 | if (*name == '/') | |
69 | p = d; | |
70 | if (p == newdir) | |
71 | return 0; | |
72 | *p = 0; | |
73 | ||
74 | /* make the new directory, if that fails then make its parent */ | |
addf0c4a WD |
75 | while (do_mkdir(newdir, mask) != 0) { |
76 | if (errno != ENOENT || !make_dir(newdir, mask)) | |
66203a98 | 77 | return 0; |
addf0c4a | 78 | } |
66203a98 AT |
79 | |
80 | return 1; | |
81 | } /* make_dir */ | |
82 | ||
83 | ||
378a074c AT |
84 | /**************************************************************************** |
85 | Create a directory given an absolute path, perms based upon another directory | |
86 | path | |
87 | ****************************************************************************/ | |
47d6a60c | 88 | static int make_bak_dir(char *fname, char *bak_path) |
378a074c | 89 | { |
47d6a60c S |
90 | STRUCT_STAT st; |
91 | STRUCT_STAT *st2; | |
92 | char fullpath[MAXPATHLEN]; | |
47d6a60c S |
93 | char *p; |
94 | char *q; | |
95 | ||
96 | while(strncmp(bak_path, "./", 2) == 0) bak_path += 2; | |
97 | ||
5d2a7071 WD |
98 | if (pathjoin(fullpath, sizeof fullpath, bak_path, fname) |
99 | >= sizeof fullpath) { | |
100 | rprintf(FERROR, "backup dirname too long\n"); | |
101 | return 0; | |
47d6a60c S |
102 | } |
103 | p = fullpath; | |
5d2a7071 WD |
104 | q = fullpath + strlen(bak_path); |
105 | if (*q == '/') | |
106 | q++; /* Point past the middle '/' added by pathjoin(). */ | |
47d6a60c S |
107 | |
108 | /* Make the directories */ | |
addf0c4a | 109 | while ((p = strchr(p, '/')) != NULL) { |
47d6a60c | 110 | *p = 0; |
addf0c4a | 111 | if (do_lstat(fullpath, &st) != 0) { |
47d6a60c | 112 | do_mkdir(fullpath, 0777 & ~orig_umask); |
addf0c4a WD |
113 | if (p > q) { |
114 | if (do_lstat(q, &st) != 0) { | |
ea42541f WD |
115 | rprintf(FERROR, "make_bak_dir stat %s failed: %s\n", |
116 | full_fname(fullpath), strerror(errno)); | |
47d6a60c S |
117 | } else { |
118 | st2 = &st; | |
119 | set_modtime(fullpath, st2->st_mtime); | |
addf0c4a | 120 | if (do_lchown(fullpath, st2->st_uid, st2->st_gid) != 0) { |
ea42541f WD |
121 | rprintf(FERROR, "make_bak_dir chown %s failed: %s\n", |
122 | full_fname(fullpath), strerror(errno)); | |
47d6a60c | 123 | } |
addf0c4a | 124 | if (do_chmod(fullpath, st2->st_mode) != 0) { |
ea42541f WD |
125 | rprintf(FERROR, "make_bak_dir failed to set permissions on %s: %s\n", |
126 | full_fname(fullpath), strerror(errno)); | |
47d6a60c S |
127 | } |
128 | } | |
129 | } | |
130 | } | |
5d2a7071 | 131 | *p++ = '/'; |
47d6a60c S |
132 | } |
133 | return 0; | |
378a074c AT |
134 | } |
135 | ||
66203a98 AT |
136 | /* robustly move a file, creating new directory structures if necessary */ |
137 | static int robust_move(char *src, char *dst) | |
138 | { | |
139 | int keep_trying = 4; | |
140 | int keep_path_extfs = 0; | |
141 | int failed; | |
142 | ||
143 | while (keep_trying) { | |
49d6fdc0 AT |
144 | if (keep_path_extfs) { |
145 | failed = copy_file(src, dst, 0755); | |
addf0c4a | 146 | if (!failed) |
49d6fdc0 | 147 | do_unlink(src); |
addf0c4a WD |
148 | } else |
149 | failed = robust_rename(src, dst); | |
66203a98 AT |
150 | |
151 | if (failed) { | |
addf0c4a WD |
152 | if (verbose > 2) { |
153 | rprintf(FERROR, "robust_move failed: %s(%d)\n", | |
154 | strerror(errno), errno); | |
155 | } | |
66203a98 | 156 | switch (errno) { |
addf0c4a WD |
157 | case EXDEV: /* external filesystem */ |
158 | keep_path_extfs = 1; | |
159 | keep_trying--; | |
160 | break; | |
161 | case ENOENT: /* no directory to write to */ | |
162 | make_dir(dst, 0700); | |
163 | keep_trying--; | |
164 | break; | |
165 | default: | |
166 | keep_trying = 0; | |
167 | break; | |
168 | } | |
66203a98 AT |
169 | } else |
170 | keep_trying = 0; | |
171 | } /* while */ | |
addf0c4a | 172 | return !failed; |
66203a98 AT |
173 | } /* robust_move */ |
174 | ||
175 | ||
176 | /* if we have a backup_dir, then we get here from make_backup(). | |
177 | We will move the file to be deleted into a parallel directory tree */ | |
178 | static int keep_backup(char *fname) | |
179 | { | |
180 | static int initialised; | |
5d2a7071 | 181 | char keep_name[MAXPATHLEN]; |
66203a98 AT |
182 | STRUCT_STAT st; |
183 | struct file_struct *file; | |
47d6a60c | 184 | int kept = 0; |
378a074c AT |
185 | int ret_code; |
186 | ||
66203a98 | 187 | if (!initialised) { |
daa8ce83 WD |
188 | if (backup_dir_len && backup_dir[backup_dir_len - 1] == '/') |
189 | backup_dir[--backup_dir_len] = '\0'; | |
66203a98 | 190 | if (verbose > 0) |
addf0c4a | 191 | rprintf(FINFO, "backup_dir is %s\n", backup_dir); |
66203a98 AT |
192 | initialised = 1; |
193 | } | |
194 | ||
195 | /* return if no file to keep */ | |
196 | #if SUPPORT_LINKS | |
addf0c4a | 197 | if (do_lstat(fname, &st)) return 1; |
66203a98 | 198 | #else |
addf0c4a | 199 | if (do_stat(fname, &st)) return 1; |
66203a98 AT |
200 | #endif |
201 | ||
f3af206d | 202 | file = make_file(fname, NO_EXCLUDES); |
f2cbf44b AT |
203 | |
204 | /* the file could have disappeared */ | |
205 | if (!file) return 1; | |
66203a98 | 206 | |
47d6a60c | 207 | /* make a complete pathname for backup file */ |
5d2a7071 WD |
208 | if (stringjoin(keep_name, sizeof keep_name, |
209 | backup_dir, "/", fname, backup_suffix, NULL) | |
210 | >= sizeof keep_name) { | |
addf0c4a | 211 | rprintf(FERROR, "keep_backup filename too long\n"); |
47d6a60c S |
212 | return 0; |
213 | } | |
378a074c | 214 | |
378a074c AT |
215 | #ifdef HAVE_MKNOD |
216 | /* Check to see if this is a device file, or link */ | |
addf0c4a WD |
217 | if (IS_DEVICE(file->mode)) { |
218 | if (am_root && preserve_devices) { | |
47d6a60c | 219 | make_bak_dir(fname, backup_dir); |
728d0922 | 220 | if (do_mknod(keep_name, file->mode, file->u.rdev) != 0) { |
ea42541f WD |
221 | rprintf(FERROR, "mknod %s failed: %s\n", |
222 | full_fname(keep_name), strerror(errno)); | |
addf0c4a WD |
223 | } else if (verbose > 2) { |
224 | rprintf(FINFO, | |
225 | "make_backup: DEVICE %s successful.\n", | |
226 | fname); | |
47d6a60c S |
227 | } |
228 | } | |
229 | kept = 1; | |
230 | do_unlink(fname); | |
231 | } | |
378a074c AT |
232 | #endif |
233 | ||
addf0c4a | 234 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 235 | /* make an empty directory */ |
47d6a60c S |
236 | make_bak_dir(fname, backup_dir); |
237 | do_mkdir(keep_name, file->mode); | |
238 | ret_code = do_rmdir(fname); | |
239 | ||
addf0c4a | 240 | if (verbose > 2) { |
ea42541f WD |
241 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
242 | full_fname(fname), ret_code); | |
47d6a60c S |
243 | } |
244 | kept = 1; | |
245 | } | |
378a074c AT |
246 | |
247 | #if SUPPORT_LINKS | |
addf0c4a | 248 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
47d6a60c | 249 | extern int safe_symlinks; |
728d0922 | 250 | if (safe_symlinks && unsafe_symlink(file->u.link, keep_name)) { |
47d6a60c S |
251 | if (verbose) { |
252 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", | |
728d0922 | 253 | full_fname(keep_name), file->u.link); |
47d6a60c S |
254 | } |
255 | kept = 1; | |
256 | } | |
257 | make_bak_dir(fname, backup_dir); | |
728d0922 | 258 | if (do_symlink(file->u.link, keep_name) != 0) { |
47d6a60c | 259 | rprintf(FERROR, "link %s -> %s : %s\n", |
728d0922 | 260 | full_fname(keep_name), file->u.link, strerror(errno)); |
47d6a60c S |
261 | } |
262 | do_unlink(fname); | |
263 | kept = 1; | |
264 | } | |
378a074c | 265 | #endif |
aa23c220 | 266 | if (!kept && preserve_hard_links && file->link_u.links |
91a1e147 | 267 | && hlink_list[file->F_HLINDEX] != file) { |
addf0c4a | 268 | if (verbose > 1) |
47d6a60c S |
269 | rprintf(FINFO, "%s is a hard link\n", f_name(file)); |
270 | } | |
378a074c | 271 | |
addf0c4a | 272 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 273 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
addf0c4a | 274 | fname); |
47d6a60c | 275 | } |
66203a98 | 276 | |
66203a98 | 277 | /* move to keep tree if a file */ |
addf0c4a WD |
278 | if (!kept) { |
279 | if (!robust_move(fname, keep_name)) { | |
ea42541f WD |
280 | rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n", |
281 | full_fname(fname), keep_name, strerror(errno)); | |
47d6a60c S |
282 | } |
283 | } | |
addf0c4a | 284 | set_perms(keep_name, file, NULL, 0); |
f3af206d | 285 | free_file(file, FREE_STRUCT); |
378a074c | 286 | |
66203a98 | 287 | if (verbose > 1) |
addf0c4a | 288 | rprintf(FINFO, "keep_backup %s -> %s\n", fname, keep_name); |
66203a98 AT |
289 | return 1; |
290 | } /* keep_backup */ | |
291 | ||
292 | ||
293 | /* main backup switch routine */ | |
294 | int make_backup(char *fname) | |
295 | { | |
296 | if (backup_dir) | |
addf0c4a WD |
297 | return keep_backup(fname); |
298 | return make_simple_backup(fname); | |
66203a98 | 299 | } |