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; | |
de0e2250 WD |
26 | extern unsigned int backup_dir_remainder; |
27 | extern char backup_dir_buf[MAXPATHLEN]; | |
3d19b4c8 | 28 | extern char *backup_suffix; |
66203a98 | 29 | extern char *backup_dir; |
3d19b4c8 | 30 | |
378a074c AT |
31 | extern int am_root; |
32 | extern int preserve_devices; | |
33 | extern int preserve_links; | |
34 | extern int preserve_hard_links; | |
5d2a7071 | 35 | extern int orig_umask; |
377dbd20 | 36 | extern int safe_symlinks; |
378a074c | 37 | |
c94e4afb WD |
38 | /* make a complete pathname for backup file */ |
39 | char *get_backup_name(char *fname) | |
40 | { | |
c94e4afb WD |
41 | if (backup_dir) { |
42 | if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder, | |
43 | fname, backup_suffix, NULL) < backup_dir_remainder) | |
44 | return backup_dir_buf; | |
45 | } else { | |
fb22c277 WD |
46 | if (stringjoin(backup_dir_buf, MAXPATHLEN, |
47 | fname, backup_suffix, NULL) < MAXPATHLEN) | |
48 | return backup_dir_buf; | |
c94e4afb WD |
49 | } |
50 | ||
51 | rprintf(FERROR, "backup filename too long\n"); | |
52 | return NULL; | |
53 | } | |
54 | ||
66203a98 AT |
55 | /* simple backup creates a backup with a suffix in the same directory */ |
56 | static int make_simple_backup(char *fname) | |
3d19b4c8 | 57 | { |
c94e4afb | 58 | char *fnamebak = get_backup_name(fname); |
5d2a7071 | 59 | |
c94e4afb | 60 | if (!fnamebak) |
3d19b4c8 | 61 | return 0; |
3d19b4c8 | 62 | |
47d6a60c | 63 | if (do_rename(fname, fnamebak) != 0) { |
3d19b4c8 AT |
64 | /* cygwin (at least version b19) reports EINVAL */ |
65 | if (errno != ENOENT && errno != EINVAL) { | |
d62bcc17 WD |
66 | rsyserr(FERROR, errno, |
67 | "rename %s to backup %s", fname, fnamebak); | |
3d19b4c8 AT |
68 | return 0; |
69 | } | |
70 | } else if (verbose > 1) { | |
47d6a60c | 71 | rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak); |
3d19b4c8 AT |
72 | } |
73 | return 1; | |
74 | } | |
66203a98 AT |
75 | |
76 | ||
378a074c AT |
77 | /**************************************************************************** |
78 | Create a directory given an absolute path, perms based upon another directory | |
79 | path | |
80 | ****************************************************************************/ | |
de0e2250 | 81 | static int make_bak_dir(char *fullpath) |
378a074c | 82 | { |
47d6a60c | 83 | STRUCT_STAT st; |
de0e2250 WD |
84 | char *rel = fullpath + backup_dir_len; |
85 | char *end = rel + strlen(rel); | |
86 | char *p = end; | |
87 | ||
88 | while (strncmp(fullpath, "./", 2) == 0) | |
89 | fullpath += 2; | |
90 | ||
91 | /* Try to find an existing dir, starting from the deepest dir. */ | |
92 | while (1) { | |
93 | if (--p == fullpath) { | |
94 | p += strlen(p); | |
95 | goto failure; | |
96 | } | |
97 | if (*p == '/') { | |
98 | *p = '\0'; | |
99 | if (do_mkdir(fullpath, 0777 & ~orig_umask) == 0) | |
100 | break; | |
101 | if (errno != ENOENT) { | |
d62bcc17 WD |
102 | rsyserr(FERROR, errno, |
103 | "make_bak_dir mkdir %s failed", | |
104 | full_fname(fullpath)); | |
de0e2250 WD |
105 | goto failure; |
106 | } | |
107 | } | |
47d6a60c | 108 | } |
de0e2250 WD |
109 | |
110 | /* Make all the dirs that we didn't find on the way here. */ | |
111 | while (1) { | |
112 | if (p >= rel) { | |
113 | /* Try to transfer the directory settings of the | |
114 | * actual dir that the files are coming from. */ | |
9fd62d15 | 115 | if (do_stat(rel, &st) < 0) { |
d62bcc17 WD |
116 | rsyserr(FERROR, errno, |
117 | "make_bak_dir stat %s failed", | |
118 | full_fname(rel)); | |
de0e2250 | 119 | } else { |
de0e2250 WD |
120 | do_lchown(fullpath, st.st_uid, st.st_gid); |
121 | do_chmod(fullpath, st.st_mode); | |
47d6a60c S |
122 | } |
123 | } | |
de0e2250 WD |
124 | *p = '/'; |
125 | p += strlen(p); | |
126 | if (p == end) | |
127 | break; | |
128 | if (do_mkdir(fullpath, 0777 & ~orig_umask) < 0) { | |
d62bcc17 WD |
129 | rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed", |
130 | full_fname(fullpath)); | |
de0e2250 WD |
131 | goto failure; |
132 | } | |
47d6a60c S |
133 | } |
134 | return 0; | |
de0e2250 WD |
135 | |
136 | failure: | |
137 | while (p != end) { | |
138 | *p = '/'; | |
139 | p += strlen(p); | |
140 | } | |
141 | return -1; | |
378a074c AT |
142 | } |
143 | ||
66203a98 AT |
144 | /* robustly move a file, creating new directory structures if necessary */ |
145 | static int robust_move(char *src, char *dst) | |
146 | { | |
3d061653 WD |
147 | if (robust_rename(src, dst, 0755) < 0 && (errno != ENOENT |
148 | || make_bak_dir(dst) < 0 || robust_rename(src, dst, 0755) < 0)) | |
62c9e6b3 WD |
149 | return -1; |
150 | return 0; | |
de0e2250 | 151 | } |
66203a98 AT |
152 | |
153 | ||
de0e2250 WD |
154 | /* If we have a --backup-dir, then we get here from make_backup(). |
155 | * We will move the file to be deleted into a parallel directory tree. */ | |
66203a98 AT |
156 | static int keep_backup(char *fname) |
157 | { | |
66203a98 AT |
158 | STRUCT_STAT st; |
159 | struct file_struct *file; | |
c94e4afb | 160 | char *buf; |
47d6a60c | 161 | int kept = 0; |
378a074c AT |
162 | int ret_code; |
163 | ||
66203a98 AT |
164 | /* return if no file to keep */ |
165 | #if SUPPORT_LINKS | |
9fd62d15 | 166 | ret_code = do_lstat(fname, &st); |
66203a98 | 167 | #else |
9fd62d15 | 168 | ret_code = do_stat(fname, &st); |
66203a98 | 169 | #endif |
9fd62d15 WD |
170 | if (ret_code < 0) |
171 | return 1; | |
66203a98 | 172 | |
c94e4afb WD |
173 | if (!(file = make_file(fname, NULL, NO_EXCLUDES))) |
174 | return 1; /* the file could have disappeared */ | |
66203a98 | 175 | |
c94e4afb | 176 | if (!(buf = get_backup_name(fname))) |
47d6a60c | 177 | return 0; |
378a074c | 178 | |
378a074c AT |
179 | #ifdef HAVE_MKNOD |
180 | /* Check to see if this is a device file, or link */ | |
addf0c4a WD |
181 | if (IS_DEVICE(file->mode)) { |
182 | if (am_root && preserve_devices) { | |
c94e4afb WD |
183 | if (do_mknod(buf, file->mode, file->u.rdev) < 0 |
184 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
185 | || do_mknod(buf, file->mode, file->u.rdev) < 0)) { | |
d62bcc17 | 186 | rsyserr(FERROR, errno, "mknod %s failed", |
c94e4afb | 187 | full_fname(buf)); |
addf0c4a WD |
188 | } else if (verbose > 2) { |
189 | rprintf(FINFO, | |
190 | "make_backup: DEVICE %s successful.\n", | |
191 | fname); | |
47d6a60c S |
192 | } |
193 | } | |
194 | kept = 1; | |
195 | do_unlink(fname); | |
196 | } | |
378a074c AT |
197 | #endif |
198 | ||
addf0c4a | 199 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 200 | /* make an empty directory */ |
c94e4afb WD |
201 | if (do_mkdir(buf, file->mode) < 0 |
202 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
203 | || do_mkdir(buf, file->mode) < 0)) { | |
d62bcc17 | 204 | rsyserr(FINFO, errno, "mkdir %s failed", |
c94e4afb | 205 | full_fname(buf)); |
377dbd20 | 206 | } |
47d6a60c | 207 | |
377dbd20 | 208 | ret_code = do_rmdir(fname); |
addf0c4a | 209 | if (verbose > 2) { |
ea42541f WD |
210 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
211 | full_fname(fname), ret_code); | |
47d6a60c S |
212 | } |
213 | kept = 1; | |
214 | } | |
378a074c AT |
215 | |
216 | #if SUPPORT_LINKS | |
addf0c4a | 217 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
c94e4afb | 218 | if (safe_symlinks && unsafe_symlink(file->u.link, buf)) { |
47d6a60c S |
219 | if (verbose) { |
220 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", | |
c94e4afb | 221 | full_fname(buf), file->u.link); |
47d6a60c S |
222 | } |
223 | kept = 1; | |
224 | } | |
c94e4afb WD |
225 | if (do_symlink(file->u.link, buf) < 0 |
226 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
227 | || do_symlink(file->u.link, buf) < 0)) { | |
d62bcc17 | 228 | rsyserr(FERROR, errno, "link %s -> \"%s\"", |
c94e4afb | 229 | full_fname(buf), file->u.link); |
47d6a60c S |
230 | } |
231 | do_unlink(fname); | |
232 | kept = 1; | |
233 | } | |
378a074c | 234 | #endif |
378a074c | 235 | |
addf0c4a | 236 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 237 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
addf0c4a | 238 | fname); |
f8c8ef9e | 239 | return 1; |
47d6a60c | 240 | } |
66203a98 | 241 | |
66203a98 | 242 | /* move to keep tree if a file */ |
addf0c4a | 243 | if (!kept) { |
c94e4afb | 244 | if (robust_move(fname, buf) != 0) { |
d62bcc17 | 245 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
c94e4afb | 246 | full_fname(fname), buf); |
394bcdb5 WD |
247 | } else if (st.st_nlink > 1) { |
248 | /* If someone has hard-linked the file into the backup | |
3cb22c20 | 249 | * dir, rename() might return success but do nothing! */ |
394bcdb5 | 250 | robust_unlink(fname); /* Just in case... */ |
47d6a60c S |
251 | } |
252 | } | |
c94e4afb | 253 | set_perms(buf, file, NULL, 0); |
9935066b | 254 | free(file); |
378a074c | 255 | |
66203a98 | 256 | if (verbose > 1) |
29fe3961 | 257 | rprintf(FINFO, "backed up %s to %s\n", fname, buf); |
66203a98 | 258 | return 1; |
de0e2250 | 259 | } |
66203a98 AT |
260 | |
261 | ||
262 | /* main backup switch routine */ | |
263 | int make_backup(char *fname) | |
264 | { | |
265 | if (backup_dir) | |
addf0c4a WD |
266 | return keep_backup(fname); |
267 | return make_simple_backup(fname); | |
66203a98 | 268 | } |