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 | 66 | rsyserr(FERROR, errno, |
4875d6b6 WD |
67 | "rename %s to backup %s", |
68 | safe_fname(fname), safe_fname(fnamebak)); | |
3d19b4c8 AT |
69 | return 0; |
70 | } | |
71 | } else if (verbose > 1) { | |
4875d6b6 WD |
72 | rprintf(FINFO, "backed up %s to %s\n", |
73 | safe_fname(fname), safe_fname(fnamebak)); | |
3d19b4c8 AT |
74 | } |
75 | return 1; | |
76 | } | |
66203a98 AT |
77 | |
78 | ||
378a074c AT |
79 | /**************************************************************************** |
80 | Create a directory given an absolute path, perms based upon another directory | |
81 | path | |
82 | ****************************************************************************/ | |
de0e2250 | 83 | static int make_bak_dir(char *fullpath) |
378a074c | 84 | { |
47d6a60c | 85 | STRUCT_STAT st; |
de0e2250 WD |
86 | char *rel = fullpath + backup_dir_len; |
87 | char *end = rel + strlen(rel); | |
88 | char *p = end; | |
89 | ||
90 | while (strncmp(fullpath, "./", 2) == 0) | |
91 | fullpath += 2; | |
92 | ||
93 | /* Try to find an existing dir, starting from the deepest dir. */ | |
94 | while (1) { | |
95 | if (--p == fullpath) { | |
96 | p += strlen(p); | |
97 | goto failure; | |
98 | } | |
99 | if (*p == '/') { | |
100 | *p = '\0'; | |
101 | if (do_mkdir(fullpath, 0777 & ~orig_umask) == 0) | |
102 | break; | |
103 | if (errno != ENOENT) { | |
d62bcc17 WD |
104 | rsyserr(FERROR, errno, |
105 | "make_bak_dir mkdir %s failed", | |
106 | full_fname(fullpath)); | |
de0e2250 WD |
107 | goto failure; |
108 | } | |
109 | } | |
47d6a60c | 110 | } |
de0e2250 WD |
111 | |
112 | /* Make all the dirs that we didn't find on the way here. */ | |
113 | while (1) { | |
114 | if (p >= rel) { | |
115 | /* Try to transfer the directory settings of the | |
116 | * actual dir that the files are coming from. */ | |
9fd62d15 | 117 | if (do_stat(rel, &st) < 0) { |
d62bcc17 WD |
118 | rsyserr(FERROR, errno, |
119 | "make_bak_dir stat %s failed", | |
120 | full_fname(rel)); | |
de0e2250 | 121 | } else { |
de0e2250 WD |
122 | do_lchown(fullpath, st.st_uid, st.st_gid); |
123 | do_chmod(fullpath, st.st_mode); | |
47d6a60c S |
124 | } |
125 | } | |
de0e2250 WD |
126 | *p = '/'; |
127 | p += strlen(p); | |
128 | if (p == end) | |
129 | break; | |
130 | if (do_mkdir(fullpath, 0777 & ~orig_umask) < 0) { | |
d62bcc17 WD |
131 | rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed", |
132 | full_fname(fullpath)); | |
de0e2250 WD |
133 | goto failure; |
134 | } | |
47d6a60c S |
135 | } |
136 | return 0; | |
de0e2250 WD |
137 | |
138 | failure: | |
139 | while (p != end) { | |
140 | *p = '/'; | |
141 | p += strlen(p); | |
142 | } | |
143 | return -1; | |
378a074c AT |
144 | } |
145 | ||
66203a98 AT |
146 | /* robustly move a file, creating new directory structures if necessary */ |
147 | static int robust_move(char *src, char *dst) | |
148 | { | |
3d061653 WD |
149 | if (robust_rename(src, dst, 0755) < 0 && (errno != ENOENT |
150 | || make_bak_dir(dst) < 0 || robust_rename(src, dst, 0755) < 0)) | |
62c9e6b3 WD |
151 | return -1; |
152 | return 0; | |
de0e2250 | 153 | } |
66203a98 AT |
154 | |
155 | ||
de0e2250 WD |
156 | /* If we have a --backup-dir, then we get here from make_backup(). |
157 | * We will move the file to be deleted into a parallel directory tree. */ | |
66203a98 AT |
158 | static int keep_backup(char *fname) |
159 | { | |
66203a98 AT |
160 | STRUCT_STAT st; |
161 | struct file_struct *file; | |
c94e4afb | 162 | char *buf; |
47d6a60c | 163 | int kept = 0; |
378a074c AT |
164 | int ret_code; |
165 | ||
66203a98 | 166 | /* return if no file to keep */ |
018b2832 | 167 | if (do_lstat(fname, &st) < 0) |
9fd62d15 | 168 | return 1; |
66203a98 | 169 | |
7842418b | 170 | if (!(file = make_file(fname, NULL, NO_FILTERS))) |
c94e4afb | 171 | return 1; /* the file could have disappeared */ |
66203a98 | 172 | |
c94e4afb | 173 | if (!(buf = get_backup_name(fname))) |
47d6a60c | 174 | return 0; |
378a074c | 175 | |
378a074c | 176 | /* Check to see if this is a device file, or link */ |
addf0c4a WD |
177 | if (IS_DEVICE(file->mode)) { |
178 | if (am_root && preserve_devices) { | |
c94e4afb WD |
179 | if (do_mknod(buf, file->mode, file->u.rdev) < 0 |
180 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
181 | || do_mknod(buf, file->mode, file->u.rdev) < 0)) { | |
d62bcc17 | 182 | rsyserr(FERROR, errno, "mknod %s failed", |
c94e4afb | 183 | full_fname(buf)); |
addf0c4a WD |
184 | } else if (verbose > 2) { |
185 | rprintf(FINFO, | |
186 | "make_backup: DEVICE %s successful.\n", | |
4875d6b6 | 187 | safe_fname(fname)); |
47d6a60c S |
188 | } |
189 | } | |
190 | kept = 1; | |
191 | do_unlink(fname); | |
192 | } | |
378a074c | 193 | |
addf0c4a | 194 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 195 | /* make an empty directory */ |
c94e4afb WD |
196 | if (do_mkdir(buf, file->mode) < 0 |
197 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
198 | || do_mkdir(buf, file->mode) < 0)) { | |
d62bcc17 | 199 | rsyserr(FINFO, errno, "mkdir %s failed", |
c94e4afb | 200 | full_fname(buf)); |
377dbd20 | 201 | } |
47d6a60c | 202 | |
377dbd20 | 203 | ret_code = do_rmdir(fname); |
addf0c4a | 204 | if (verbose > 2) { |
ea42541f WD |
205 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
206 | full_fname(fname), ret_code); | |
47d6a60c S |
207 | } |
208 | kept = 1; | |
209 | } | |
378a074c | 210 | |
4f5b0756 | 211 | #ifdef SUPPORT_LINKS |
addf0c4a | 212 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
c94e4afb | 213 | if (safe_symlinks && unsafe_symlink(file->u.link, buf)) { |
47d6a60c S |
214 | if (verbose) { |
215 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", | |
c94e4afb | 216 | full_fname(buf), file->u.link); |
47d6a60c S |
217 | } |
218 | kept = 1; | |
219 | } | |
c94e4afb WD |
220 | if (do_symlink(file->u.link, buf) < 0 |
221 | && (errno != ENOENT || make_bak_dir(buf) < 0 | |
222 | || do_symlink(file->u.link, buf) < 0)) { | |
d62bcc17 | 223 | rsyserr(FERROR, errno, "link %s -> \"%s\"", |
4875d6b6 | 224 | full_fname(buf), safe_fname(file->u.link)); |
47d6a60c S |
225 | } |
226 | do_unlink(fname); | |
227 | kept = 1; | |
228 | } | |
378a074c | 229 | #endif |
378a074c | 230 | |
addf0c4a | 231 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 232 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
4875d6b6 | 233 | safe_fname(fname)); |
f8c8ef9e | 234 | return 1; |
47d6a60c | 235 | } |
66203a98 | 236 | |
66203a98 | 237 | /* move to keep tree if a file */ |
addf0c4a | 238 | if (!kept) { |
c94e4afb | 239 | if (robust_move(fname, buf) != 0) { |
d62bcc17 | 240 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
4875d6b6 | 241 | full_fname(fname), safe_fname(buf)); |
394bcdb5 WD |
242 | } else if (st.st_nlink > 1) { |
243 | /* If someone has hard-linked the file into the backup | |
3cb22c20 | 244 | * dir, rename() might return success but do nothing! */ |
394bcdb5 | 245 | robust_unlink(fname); /* Just in case... */ |
47d6a60c S |
246 | } |
247 | } | |
c94e4afb | 248 | set_perms(buf, file, NULL, 0); |
9935066b | 249 | free(file); |
378a074c | 250 | |
4875d6b6 WD |
251 | if (verbose > 1) { |
252 | rprintf(FINFO, "backed up %s to %s\n", | |
253 | safe_fname(fname), safe_fname(buf)); | |
254 | } | |
66203a98 | 255 | return 1; |
de0e2250 | 256 | } |
66203a98 AT |
257 | |
258 | ||
259 | /* main backup switch routine */ | |
260 | int make_backup(char *fname) | |
261 | { | |
262 | if (backup_dir) | |
addf0c4a WD |
263 | return keep_backup(fname); |
264 | return make_simple_backup(fname); | |
66203a98 | 265 | } |