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; |
3d19b4c8 | 28 | |
378a074c AT |
29 | extern int am_root; |
30 | extern int preserve_devices; | |
31 | extern int preserve_links; | |
32 | extern int preserve_hard_links; | |
5d2a7071 | 33 | extern int orig_umask; |
378a074c | 34 | |
66203a98 AT |
35 | /* simple backup creates a backup with a suffix in the same directory */ |
36 | static int make_simple_backup(char *fname) | |
3d19b4c8 AT |
37 | { |
38 | char fnamebak[MAXPATHLEN]; | |
5d2a7071 WD |
39 | |
40 | if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL) | |
41 | >= sizeof fnamebak) { | |
47d6a60c | 42 | rprintf(FERROR, "backup filename too long\n"); |
3d19b4c8 AT |
43 | return 0; |
44 | } | |
45 | ||
47d6a60c | 46 | if (do_rename(fname, fnamebak) != 0) { |
3d19b4c8 AT |
47 | /* cygwin (at least version b19) reports EINVAL */ |
48 | if (errno != ENOENT && errno != EINVAL) { | |
a039749b | 49 | rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak); |
3d19b4c8 AT |
50 | return 0; |
51 | } | |
52 | } else if (verbose > 1) { | |
47d6a60c | 53 | rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak); |
3d19b4c8 AT |
54 | } |
55 | return 1; | |
56 | } | |
66203a98 AT |
57 | |
58 | ||
59 | /* recursively make a directory path */ | |
60 | static int make_dir(char *name, int mask) | |
61 | { | |
62 | char newdir [MAXPATHLEN]; | |
63 | char *p, *d; | |
64 | ||
65 | /* copy pathname over, look for last '/' */ | |
66 | for (p = d = newdir; *name; *d++ = *name++) | |
67 | if (*name == '/') | |
68 | p = d; | |
69 | if (p == newdir) | |
70 | return 0; | |
71 | *p = 0; | |
72 | ||
73 | /* make the new directory, if that fails then make its parent */ | |
addf0c4a WD |
74 | while (do_mkdir(newdir, mask) != 0) { |
75 | if (errno != ENOENT || !make_dir(newdir, mask)) | |
66203a98 | 76 | return 0; |
addf0c4a | 77 | } |
66203a98 AT |
78 | |
79 | return 1; | |
80 | } /* make_dir */ | |
81 | ||
82 | ||
378a074c AT |
83 | /**************************************************************************** |
84 | Create a directory given an absolute path, perms based upon another directory | |
85 | path | |
86 | ****************************************************************************/ | |
47d6a60c | 87 | static int make_bak_dir(char *fname, char *bak_path) |
378a074c | 88 | { |
47d6a60c S |
89 | STRUCT_STAT st; |
90 | STRUCT_STAT *st2; | |
91 | char fullpath[MAXPATHLEN]; | |
47d6a60c S |
92 | char *p; |
93 | char *q; | |
94 | ||
95 | while(strncmp(bak_path, "./", 2) == 0) bak_path += 2; | |
96 | ||
5d2a7071 WD |
97 | if (pathjoin(fullpath, sizeof fullpath, bak_path, fname) |
98 | >= sizeof fullpath) { | |
99 | rprintf(FERROR, "backup dirname too long\n"); | |
100 | return 0; | |
47d6a60c S |
101 | } |
102 | p = fullpath; | |
5d2a7071 WD |
103 | q = fullpath + strlen(bak_path); |
104 | if (*q == '/') | |
105 | q++; /* Point past the middle '/' added by pathjoin(). */ | |
47d6a60c S |
106 | |
107 | /* Make the directories */ | |
addf0c4a | 108 | while ((p = strchr(p, '/')) != NULL) { |
47d6a60c | 109 | *p = 0; |
addf0c4a | 110 | if (do_lstat(fullpath, &st) != 0) { |
47d6a60c | 111 | do_mkdir(fullpath, 0777 & ~orig_umask); |
addf0c4a WD |
112 | if (p > q) { |
113 | if (do_lstat(q, &st) != 0) { | |
ea42541f WD |
114 | rprintf(FERROR, "make_bak_dir stat %s failed: %s\n", |
115 | full_fname(fullpath), strerror(errno)); | |
47d6a60c S |
116 | } else { |
117 | st2 = &st; | |
118 | set_modtime(fullpath, st2->st_mtime); | |
addf0c4a | 119 | if (do_lchown(fullpath, st2->st_uid, st2->st_gid) != 0) { |
ea42541f WD |
120 | rprintf(FERROR, "make_bak_dir chown %s failed: %s\n", |
121 | full_fname(fullpath), strerror(errno)); | |
47d6a60c | 122 | } |
addf0c4a | 123 | if (do_chmod(fullpath, st2->st_mode) != 0) { |
ea42541f WD |
124 | rprintf(FERROR, "make_bak_dir failed to set permissions on %s: %s\n", |
125 | full_fname(fullpath), strerror(errno)); | |
47d6a60c S |
126 | } |
127 | } | |
128 | } | |
129 | } | |
5d2a7071 | 130 | *p++ = '/'; |
47d6a60c S |
131 | } |
132 | return 0; | |
378a074c AT |
133 | } |
134 | ||
66203a98 AT |
135 | /* robustly move a file, creating new directory structures if necessary */ |
136 | static int robust_move(char *src, char *dst) | |
137 | { | |
138 | int keep_trying = 4; | |
139 | int keep_path_extfs = 0; | |
140 | int failed; | |
141 | ||
142 | while (keep_trying) { | |
49d6fdc0 AT |
143 | if (keep_path_extfs) { |
144 | failed = copy_file(src, dst, 0755); | |
addf0c4a | 145 | if (!failed) |
49d6fdc0 | 146 | do_unlink(src); |
addf0c4a WD |
147 | } else |
148 | failed = robust_rename(src, dst); | |
66203a98 AT |
149 | |
150 | if (failed) { | |
addf0c4a WD |
151 | if (verbose > 2) { |
152 | rprintf(FERROR, "robust_move failed: %s(%d)\n", | |
153 | strerror(errno), errno); | |
154 | } | |
66203a98 | 155 | switch (errno) { |
addf0c4a WD |
156 | case EXDEV: /* external filesystem */ |
157 | keep_path_extfs = 1; | |
158 | keep_trying--; | |
159 | break; | |
160 | case ENOENT: /* no directory to write to */ | |
161 | make_dir(dst, 0700); | |
162 | keep_trying--; | |
163 | break; | |
164 | default: | |
165 | keep_trying = 0; | |
166 | break; | |
167 | } | |
66203a98 AT |
168 | } else |
169 | keep_trying = 0; | |
170 | } /* while */ | |
addf0c4a | 171 | return !failed; |
66203a98 AT |
172 | } /* robust_move */ |
173 | ||
174 | ||
175 | /* if we have a backup_dir, then we get here from make_backup(). | |
176 | We will move the file to be deleted into a parallel directory tree */ | |
177 | static int keep_backup(char *fname) | |
178 | { | |
179 | static int initialised; | |
5d2a7071 | 180 | char keep_name[MAXPATHLEN]; |
66203a98 AT |
181 | STRUCT_STAT st; |
182 | struct file_struct *file; | |
47d6a60c | 183 | int kept = 0; |
378a074c AT |
184 | int ret_code; |
185 | ||
66203a98 | 186 | if (!initialised) { |
daa8ce83 WD |
187 | if (backup_dir_len && backup_dir[backup_dir_len - 1] == '/') |
188 | backup_dir[--backup_dir_len] = '\0'; | |
66203a98 | 189 | if (verbose > 0) |
addf0c4a | 190 | rprintf(FINFO, "backup_dir is %s\n", backup_dir); |
66203a98 AT |
191 | initialised = 1; |
192 | } | |
193 | ||
194 | /* return if no file to keep */ | |
195 | #if SUPPORT_LINKS | |
addf0c4a | 196 | if (do_lstat(fname, &st)) return 1; |
66203a98 | 197 | #else |
addf0c4a | 198 | if (do_stat(fname, &st)) return 1; |
66203a98 AT |
199 | #endif |
200 | ||
af1d91c5 | 201 | file = make_file(fname, NULL, NO_EXCLUDES); |
f2cbf44b AT |
202 | |
203 | /* the file could have disappeared */ | |
204 | if (!file) return 1; | |
66203a98 | 205 | |
47d6a60c | 206 | /* make a complete pathname for backup file */ |
5d2a7071 WD |
207 | if (stringjoin(keep_name, sizeof keep_name, |
208 | backup_dir, "/", fname, backup_suffix, NULL) | |
209 | >= sizeof keep_name) { | |
addf0c4a | 210 | rprintf(FERROR, "keep_backup filename too long\n"); |
47d6a60c S |
211 | return 0; |
212 | } | |
378a074c | 213 | |
378a074c AT |
214 | #ifdef HAVE_MKNOD |
215 | /* Check to see if this is a device file, or link */ | |
addf0c4a WD |
216 | if (IS_DEVICE(file->mode)) { |
217 | if (am_root && preserve_devices) { | |
47d6a60c | 218 | make_bak_dir(fname, backup_dir); |
728d0922 | 219 | if (do_mknod(keep_name, file->mode, file->u.rdev) != 0) { |
ea42541f WD |
220 | rprintf(FERROR, "mknod %s failed: %s\n", |
221 | full_fname(keep_name), strerror(errno)); | |
addf0c4a WD |
222 | } else if (verbose > 2) { |
223 | rprintf(FINFO, | |
224 | "make_backup: DEVICE %s successful.\n", | |
225 | fname); | |
47d6a60c S |
226 | } |
227 | } | |
228 | kept = 1; | |
229 | do_unlink(fname); | |
230 | } | |
378a074c AT |
231 | #endif |
232 | ||
addf0c4a | 233 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 234 | /* make an empty directory */ |
47d6a60c S |
235 | make_bak_dir(fname, backup_dir); |
236 | do_mkdir(keep_name, file->mode); | |
237 | ret_code = do_rmdir(fname); | |
238 | ||
addf0c4a | 239 | if (verbose > 2) { |
ea42541f WD |
240 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
241 | full_fname(fname), ret_code); | |
47d6a60c S |
242 | } |
243 | kept = 1; | |
244 | } | |
378a074c AT |
245 | |
246 | #if SUPPORT_LINKS | |
addf0c4a | 247 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
47d6a60c | 248 | extern int safe_symlinks; |
728d0922 | 249 | if (safe_symlinks && unsafe_symlink(file->u.link, keep_name)) { |
47d6a60c S |
250 | if (verbose) { |
251 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", | |
728d0922 | 252 | full_fname(keep_name), file->u.link); |
47d6a60c S |
253 | } |
254 | kept = 1; | |
255 | } | |
256 | make_bak_dir(fname, backup_dir); | |
728d0922 | 257 | if (do_symlink(file->u.link, keep_name) != 0) { |
47d6a60c | 258 | rprintf(FERROR, "link %s -> %s : %s\n", |
728d0922 | 259 | full_fname(keep_name), file->u.link, strerror(errno)); |
47d6a60c S |
260 | } |
261 | do_unlink(fname); | |
262 | kept = 1; | |
263 | } | |
378a074c | 264 | #endif |
aa23c220 WD |
265 | if (!kept && preserve_hard_links && file->link_u.links |
266 | && file->F_HEAD != file) { | |
addf0c4a | 267 | if (verbose > 1) |
47d6a60c S |
268 | rprintf(FINFO, "%s is a hard link\n", f_name(file)); |
269 | } | |
378a074c | 270 | |
addf0c4a | 271 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 272 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
addf0c4a | 273 | fname); |
47d6a60c | 274 | } |
66203a98 | 275 | |
66203a98 | 276 | /* move to keep tree if a file */ |
addf0c4a WD |
277 | if (!kept) { |
278 | if (!robust_move(fname, keep_name)) { | |
ea42541f WD |
279 | rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n", |
280 | full_fname(fname), keep_name, strerror(errno)); | |
47d6a60c S |
281 | } |
282 | } | |
addf0c4a WD |
283 | set_perms(keep_name, file, NULL, 0); |
284 | free_file(file); | |
285 | free(file); | |
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 | } |