Commit | Line | Data |
---|---|---|
addf0c4a | 1 | /* |
0f78b815 WD |
2 | * Backup handling code. |
3 | * | |
4 | * Copyright (C) 1999 Andrew Tridgell | |
ba2133d6 | 5 | * Copyright (C) 2003-2007 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
ba2133d6 WD |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. | |
0f78b815 WD |
10 | * |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
e7c67065 WD |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
0f78b815 | 19 | */ |
3d19b4c8 AT |
20 | |
21 | #include "rsync.h" | |
22 | ||
23 | extern int verbose; | |
378a074c | 24 | extern int am_root; |
1c3344a1 | 25 | extern int preserve_acls; |
378a074c | 26 | extern int preserve_devices; |
b5c6a6ae | 27 | extern int preserve_specials; |
378a074c | 28 | extern int preserve_links; |
377dbd20 | 29 | extern int safe_symlinks; |
6b2a3d5d | 30 | extern int backup_dir_len; |
82ad07c4 WD |
31 | extern unsigned int backup_dir_remainder; |
32 | extern char backup_dir_buf[MAXPATHLEN]; | |
33 | extern char *backup_suffix; | |
34 | extern char *backup_dir; | |
378a074c | 35 | |
c94e4afb | 36 | /* make a complete pathname for backup file */ |
45d8bfe0 | 37 | char *get_backup_name(const char *fname) |
c94e4afb | 38 | { |
c94e4afb WD |
39 | if (backup_dir) { |
40 | if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder, | |
41 | fname, backup_suffix, NULL) < backup_dir_remainder) | |
42 | return backup_dir_buf; | |
43 | } else { | |
fb22c277 WD |
44 | if (stringjoin(backup_dir_buf, MAXPATHLEN, |
45 | fname, backup_suffix, NULL) < MAXPATHLEN) | |
46 | return backup_dir_buf; | |
c94e4afb WD |
47 | } |
48 | ||
49 | rprintf(FERROR, "backup filename too long\n"); | |
50 | return NULL; | |
51 | } | |
52 | ||
66203a98 | 53 | /* simple backup creates a backup with a suffix in the same directory */ |
45d8bfe0 | 54 | static int make_simple_backup(const char *fname) |
3d19b4c8 | 55 | { |
ba679d51 | 56 | int rename_errno; |
45d8bfe0 | 57 | const char *fnamebak = get_backup_name(fname); |
5d2a7071 | 58 | |
c94e4afb | 59 | if (!fnamebak) |
3d19b4c8 | 60 | return 0; |
3d19b4c8 | 61 | |
ba679d51 WD |
62 | while (1) { |
63 | if (do_rename(fname, fnamebak) == 0) { | |
64 | if (verbose > 1) { | |
65 | rprintf(FINFO, "backed up %s to %s\n", | |
45c49b52 | 66 | fname, fnamebak); |
ba679d51 WD |
67 | } |
68 | break; | |
3d19b4c8 | 69 | } |
ba679d51 WD |
70 | /* cygwin (at least version b19) reports EINVAL */ |
71 | if (errno == ENOENT || errno == EINVAL) | |
72 | break; | |
73 | ||
74 | rename_errno = errno; | |
75 | if (errno == EISDIR && do_rmdir(fnamebak) == 0) | |
76 | continue; | |
77 | if (errno == ENOTDIR && do_unlink(fnamebak) == 0) | |
78 | continue; | |
79 | ||
80 | rsyserr(FERROR, rename_errno, "rename %s to backup %s", | |
45c49b52 | 81 | fname, fnamebak); |
ba679d51 WD |
82 | errno = rename_errno; |
83 | return 0; | |
3d19b4c8 | 84 | } |
ba679d51 | 85 | |
3d19b4c8 AT |
86 | return 1; |
87 | } | |
66203a98 AT |
88 | |
89 | ||
378a074c AT |
90 | /**************************************************************************** |
91 | Create a directory given an absolute path, perms based upon another directory | |
92 | path | |
93 | ****************************************************************************/ | |
de0e2250 | 94 | static int make_bak_dir(char *fullpath) |
378a074c | 95 | { |
1c3344a1 WD |
96 | statx sx; |
97 | struct file_struct *file; | |
de0e2250 WD |
98 | char *rel = fullpath + backup_dir_len; |
99 | char *end = rel + strlen(rel); | |
100 | char *p = end; | |
101 | ||
102 | while (strncmp(fullpath, "./", 2) == 0) | |
103 | fullpath += 2; | |
104 | ||
105 | /* Try to find an existing dir, starting from the deepest dir. */ | |
106 | while (1) { | |
107 | if (--p == fullpath) { | |
108 | p += strlen(p); | |
109 | goto failure; | |
110 | } | |
111 | if (*p == '/') { | |
112 | *p = '\0'; | |
a56cdef9 | 113 | if (mkdir_defmode(fullpath) == 0) |
de0e2250 WD |
114 | break; |
115 | if (errno != ENOENT) { | |
d62bcc17 WD |
116 | rsyserr(FERROR, errno, |
117 | "make_bak_dir mkdir %s failed", | |
118 | full_fname(fullpath)); | |
de0e2250 WD |
119 | goto failure; |
120 | } | |
121 | } | |
47d6a60c | 122 | } |
de0e2250 WD |
123 | |
124 | /* Make all the dirs that we didn't find on the way here. */ | |
125 | while (1) { | |
126 | if (p >= rel) { | |
127 | /* Try to transfer the directory settings of the | |
128 | * actual dir that the files are coming from. */ | |
1c3344a1 | 129 | if (do_stat(rel, &sx.st) < 0) { |
d62bcc17 WD |
130 | rsyserr(FERROR, errno, |
131 | "make_bak_dir stat %s failed", | |
132 | full_fname(rel)); | |
de0e2250 | 133 | } else { |
1c3344a1 WD |
134 | #ifdef SUPPORT_ACLS |
135 | sx.acc_acl = sx.def_acl = NULL; | |
136 | #endif | |
137 | if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS))) | |
138 | continue; | |
139 | #ifdef SUPPORT_ACLS | |
140 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
141 | get_acl(rel, &sx); | |
142 | cache_acl(file, &sx); | |
143 | free_acl(&sx); | |
144 | } | |
1e999f9f | 145 | #endif |
1c3344a1 WD |
146 | set_file_attrs(fullpath, file, NULL, 0); |
147 | free(file); | |
47d6a60c S |
148 | } |
149 | } | |
de0e2250 WD |
150 | *p = '/'; |
151 | p += strlen(p); | |
152 | if (p == end) | |
153 | break; | |
a56cdef9 | 154 | if (mkdir_defmode(fullpath) < 0) { |
d62bcc17 WD |
155 | rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed", |
156 | full_fname(fullpath)); | |
de0e2250 WD |
157 | goto failure; |
158 | } | |
47d6a60c S |
159 | } |
160 | return 0; | |
de0e2250 | 161 | |
b2e6caa0 | 162 | failure: |
de0e2250 WD |
163 | while (p != end) { |
164 | *p = '/'; | |
165 | p += strlen(p); | |
166 | } | |
167 | return -1; | |
378a074c AT |
168 | } |
169 | ||
66203a98 | 170 | /* robustly move a file, creating new directory structures if necessary */ |
45d8bfe0 | 171 | static int robust_move(const char *src, char *dst) |
66203a98 | 172 | { |
21955d9c WD |
173 | if (robust_rename(src, dst, NULL, 0755) < 0 |
174 | && (errno != ENOENT || make_bak_dir(dst) < 0 | |
175 | || robust_rename(src, dst, NULL, 0755) < 0)) | |
62c9e6b3 WD |
176 | return -1; |
177 | return 0; | |
de0e2250 | 178 | } |
66203a98 AT |
179 | |
180 | ||
de0e2250 WD |
181 | /* If we have a --backup-dir, then we get here from make_backup(). |
182 | * We will move the file to be deleted into a parallel directory tree. */ | |
45d8bfe0 | 183 | static int keep_backup(const char *fname) |
66203a98 | 184 | { |
1c3344a1 | 185 | statx sx; |
66203a98 | 186 | struct file_struct *file; |
c94e4afb | 187 | char *buf; |
47d6a60c | 188 | int kept = 0; |
378a074c AT |
189 | int ret_code; |
190 | ||
66203a98 | 191 | /* return if no file to keep */ |
1c3344a1 | 192 | if (do_lstat(fname, &sx.st) < 0) |
9fd62d15 | 193 | return 1; |
1c3344a1 WD |
194 | #ifdef SUPPORT_ACLS |
195 | sx.acc_acl = sx.def_acl = NULL; | |
196 | #endif | |
66203a98 | 197 | |
3de73827 | 198 | if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) |
c94e4afb | 199 | return 1; /* the file could have disappeared */ |
66203a98 | 200 | |
82ad07c4 WD |
201 | if (!(buf = get_backup_name(fname))) { |
202 | unmake_file(file); | |
47d6a60c | 203 | return 0; |
82ad07c4 | 204 | } |
378a074c | 205 | |
1c3344a1 WD |
206 | #ifdef SUPPORT_ACLS |
207 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
208 | get_acl(fname, &sx); | |
209 | cache_acl(file, &sx); | |
210 | free_acl(&sx); | |
211 | } | |
212 | #endif | |
213 | ||
378a074c | 214 | /* Check to see if this is a device file, or link */ |
b5c6a6ae WD |
215 | if ((am_root && preserve_devices && IS_DEVICE(file->mode)) |
216 | || (preserve_specials && IS_SPECIAL(file->mode))) { | |
e238c997 WD |
217 | uint32 *devp = F_RDEV_P(file); |
218 | dev_t rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp)); | |
93e28fbd | 219 | do_unlink(buf); |
82ad07c4 | 220 | if (do_mknod(buf, file->mode, rdev) < 0 |
93e28fbd | 221 | && (errno != ENOENT || make_bak_dir(buf) < 0 |
82ad07c4 | 222 | || do_mknod(buf, file->mode, rdev) < 0)) { |
93e28fbd WD |
223 | rsyserr(FERROR, errno, "mknod %s failed", |
224 | full_fname(buf)); | |
225 | } else if (verbose > 2) { | |
226 | rprintf(FINFO, "make_backup: DEVICE %s successful.\n", | |
45c49b52 | 227 | fname); |
47d6a60c S |
228 | } |
229 | kept = 1; | |
230 | do_unlink(fname); | |
231 | } | |
378a074c | 232 | |
addf0c4a | 233 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 234 | /* make an empty directory */ |
c94e4afb WD |
235 | if (do_mkdir(buf, file->mode) < 0 |
236 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
237 | || do_mkdir(buf, file->mode) < 0)) { | |
d62bcc17 | 238 | rsyserr(FINFO, errno, "mkdir %s failed", |
c94e4afb | 239 | full_fname(buf)); |
377dbd20 | 240 | } |
47d6a60c | 241 | |
377dbd20 | 242 | ret_code = do_rmdir(fname); |
addf0c4a | 243 | if (verbose > 2) { |
ea42541f WD |
244 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
245 | full_fname(fname), ret_code); | |
47d6a60c S |
246 | } |
247 | kept = 1; | |
248 | } | |
378a074c | 249 | |
4f5b0756 | 250 | #ifdef SUPPORT_LINKS |
addf0c4a | 251 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
82ad07c4 WD |
252 | const char *sl = F_SYMLINK(file); |
253 | if (safe_symlinks && unsafe_symlink(sl, buf)) { | |
47d6a60c S |
254 | if (verbose) { |
255 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", | |
82ad07c4 | 256 | full_fname(buf), sl); |
47d6a60c S |
257 | } |
258 | kept = 1; | |
93e28fbd WD |
259 | } else { |
260 | do_unlink(buf); | |
82ad07c4 | 261 | if (do_symlink(sl, buf) < 0 |
93e28fbd | 262 | && (errno != ENOENT || make_bak_dir(buf) < 0 |
82ad07c4 | 263 | || do_symlink(sl, buf) < 0)) { |
93e28fbd | 264 | rsyserr(FERROR, errno, "link %s -> \"%s\"", |
82ad07c4 | 265 | full_fname(buf), sl); |
93e28fbd WD |
266 | } |
267 | do_unlink(fname); | |
268 | kept = 1; | |
47d6a60c | 269 | } |
47d6a60c | 270 | } |
378a074c | 271 | #endif |
378a074c | 272 | |
addf0c4a | 273 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 274 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
45c49b52 | 275 | fname); |
82ad07c4 | 276 | unmake_file(file); |
f8c8ef9e | 277 | return 1; |
47d6a60c | 278 | } |
66203a98 | 279 | |
66203a98 | 280 | /* move to keep tree if a file */ |
addf0c4a | 281 | if (!kept) { |
c94e4afb | 282 | if (robust_move(fname, buf) != 0) { |
d62bcc17 | 283 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
45c49b52 | 284 | full_fname(fname), buf); |
1c3344a1 | 285 | } else if (sx.st.st_nlink > 1) { |
394bcdb5 | 286 | /* If someone has hard-linked the file into the backup |
3cb22c20 | 287 | * dir, rename() might return success but do nothing! */ |
394bcdb5 | 288 | robust_unlink(fname); /* Just in case... */ |
47d6a60c S |
289 | } |
290 | } | |
c3ef136d | 291 | set_file_attrs(buf, file, NULL, 0); |
82ad07c4 | 292 | unmake_file(file); |
378a074c | 293 | |
4875d6b6 WD |
294 | if (verbose > 1) { |
295 | rprintf(FINFO, "backed up %s to %s\n", | |
45c49b52 | 296 | fname, buf); |
4875d6b6 | 297 | } |
66203a98 | 298 | return 1; |
de0e2250 | 299 | } |
66203a98 AT |
300 | |
301 | ||
302 | /* main backup switch routine */ | |
45d8bfe0 | 303 | int make_backup(const char *fname) |
66203a98 AT |
304 | { |
305 | if (backup_dir) | |
addf0c4a WD |
306 | return keep_backup(fname); |
307 | return make_simple_backup(fname); | |
66203a98 | 308 | } |