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; |
378a074c | 36 | |
66203a98 AT |
37 | /* simple backup creates a backup with a suffix in the same directory */ |
38 | static int make_simple_backup(char *fname) | |
3d19b4c8 AT |
39 | { |
40 | char fnamebak[MAXPATHLEN]; | |
5d2a7071 WD |
41 | |
42 | if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL) | |
43 | >= sizeof fnamebak) { | |
47d6a60c | 44 | rprintf(FERROR, "backup filename too long\n"); |
3d19b4c8 AT |
45 | return 0; |
46 | } | |
47 | ||
47d6a60c | 48 | if (do_rename(fname, fnamebak) != 0) { |
3d19b4c8 AT |
49 | /* cygwin (at least version b19) reports EINVAL */ |
50 | if (errno != ENOENT && errno != EINVAL) { | |
a039749b | 51 | rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak); |
3d19b4c8 AT |
52 | return 0; |
53 | } | |
54 | } else if (verbose > 1) { | |
47d6a60c | 55 | rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak); |
3d19b4c8 AT |
56 | } |
57 | return 1; | |
58 | } | |
66203a98 AT |
59 | |
60 | ||
378a074c AT |
61 | /**************************************************************************** |
62 | Create a directory given an absolute path, perms based upon another directory | |
63 | path | |
64 | ****************************************************************************/ | |
de0e2250 | 65 | static int make_bak_dir(char *fullpath) |
378a074c | 66 | { |
47d6a60c | 67 | STRUCT_STAT st; |
de0e2250 WD |
68 | char *rel = fullpath + backup_dir_len; |
69 | char *end = rel + strlen(rel); | |
70 | char *p = end; | |
71 | ||
72 | while (strncmp(fullpath, "./", 2) == 0) | |
73 | fullpath += 2; | |
74 | ||
75 | /* Try to find an existing dir, starting from the deepest dir. */ | |
76 | while (1) { | |
77 | if (--p == fullpath) { | |
78 | p += strlen(p); | |
79 | goto failure; | |
80 | } | |
81 | if (*p == '/') { | |
82 | *p = '\0'; | |
83 | if (do_mkdir(fullpath, 0777 & ~orig_umask) == 0) | |
84 | break; | |
85 | if (errno != ENOENT) { | |
86 | rprintf(FERROR, | |
87 | "make_bak_dir mkdir %s failed: %s\n", | |
88 | full_fname(fullpath), strerror(errno)); | |
89 | goto failure; | |
90 | } | |
91 | } | |
47d6a60c | 92 | } |
de0e2250 WD |
93 | |
94 | /* Make all the dirs that we didn't find on the way here. */ | |
95 | while (1) { | |
96 | if (p >= rel) { | |
97 | /* Try to transfer the directory settings of the | |
98 | * actual dir that the files are coming from. */ | |
99 | if (do_lstat(rel, &st) != 0) { | |
100 | rprintf(FERROR, | |
101 | "make_bak_dir stat %s failed: %s\n", | |
102 | full_fname(rel), strerror(errno)); | |
103 | } else { | |
104 | set_modtime(fullpath, st.st_mtime); | |
105 | do_lchown(fullpath, st.st_uid, st.st_gid); | |
106 | do_chmod(fullpath, st.st_mode); | |
47d6a60c S |
107 | } |
108 | } | |
de0e2250 WD |
109 | *p = '/'; |
110 | p += strlen(p); | |
111 | if (p == end) | |
112 | break; | |
113 | if (do_mkdir(fullpath, 0777 & ~orig_umask) < 0) { | |
114 | rprintf(FERROR, | |
115 | "make_bak_dir mkdir %s failed: %s\n", | |
116 | full_fname(fullpath), strerror(errno)); | |
117 | goto failure; | |
118 | } | |
47d6a60c S |
119 | } |
120 | return 0; | |
de0e2250 WD |
121 | |
122 | failure: | |
123 | while (p != end) { | |
124 | *p = '/'; | |
125 | p += strlen(p); | |
126 | } | |
127 | return -1; | |
378a074c AT |
128 | } |
129 | ||
66203a98 AT |
130 | /* robustly move a file, creating new directory structures if necessary */ |
131 | static int robust_move(char *src, char *dst) | |
132 | { | |
9d78ed31 WD |
133 | if (robust_rename(src, dst, 0755) != 0 && (errno != ENOENT |
134 | || make_bak_dir(dst) < 0 || robust_rename(src, dst, 0755) != 0)) | |
62c9e6b3 WD |
135 | return -1; |
136 | return 0; | |
de0e2250 | 137 | } |
66203a98 AT |
138 | |
139 | ||
de0e2250 WD |
140 | /* If we have a --backup-dir, then we get here from make_backup(). |
141 | * We will move the file to be deleted into a parallel directory tree. */ | |
66203a98 AT |
142 | static int keep_backup(char *fname) |
143 | { | |
66203a98 AT |
144 | STRUCT_STAT st; |
145 | struct file_struct *file; | |
47d6a60c | 146 | int kept = 0; |
378a074c AT |
147 | int ret_code; |
148 | ||
66203a98 AT |
149 | /* return if no file to keep */ |
150 | #if SUPPORT_LINKS | |
addf0c4a | 151 | if (do_lstat(fname, &st)) return 1; |
66203a98 | 152 | #else |
addf0c4a | 153 | if (do_stat(fname, &st)) return 1; |
66203a98 AT |
154 | #endif |
155 | ||
9935066b | 156 | file = make_file(fname, NULL, NO_EXCLUDES); |
f2cbf44b AT |
157 | |
158 | /* the file could have disappeared */ | |
159 | if (!file) return 1; | |
66203a98 | 160 | |
47d6a60c | 161 | /* make a complete pathname for backup file */ |
de0e2250 WD |
162 | if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder, |
163 | fname, backup_suffix, NULL) >= backup_dir_remainder) { | |
addf0c4a | 164 | rprintf(FERROR, "keep_backup filename too long\n"); |
47d6a60c S |
165 | return 0; |
166 | } | |
378a074c | 167 | |
378a074c AT |
168 | #ifdef HAVE_MKNOD |
169 | /* Check to see if this is a device file, or link */ | |
addf0c4a WD |
170 | if (IS_DEVICE(file->mode)) { |
171 | if (am_root && preserve_devices) { | |
de0e2250 WD |
172 | make_bak_dir(backup_dir_buf); |
173 | if (do_mknod(backup_dir_buf, file->mode, file->u.rdev) != 0) { | |
ea42541f | 174 | rprintf(FERROR, "mknod %s failed: %s\n", |
de0e2250 | 175 | full_fname(backup_dir_buf), strerror(errno)); |
addf0c4a WD |
176 | } else if (verbose > 2) { |
177 | rprintf(FINFO, | |
178 | "make_backup: DEVICE %s successful.\n", | |
179 | fname); | |
47d6a60c S |
180 | } |
181 | } | |
182 | kept = 1; | |
183 | do_unlink(fname); | |
184 | } | |
378a074c AT |
185 | #endif |
186 | ||
addf0c4a | 187 | if (!kept && S_ISDIR(file->mode)) { |
378a074c | 188 | /* make an empty directory */ |
de0e2250 WD |
189 | make_bak_dir(backup_dir_buf); |
190 | do_mkdir(backup_dir_buf, file->mode); | |
47d6a60c S |
191 | ret_code = do_rmdir(fname); |
192 | ||
addf0c4a | 193 | if (verbose > 2) { |
ea42541f WD |
194 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
195 | full_fname(fname), ret_code); | |
47d6a60c S |
196 | } |
197 | kept = 1; | |
198 | } | |
378a074c AT |
199 | |
200 | #if SUPPORT_LINKS | |
addf0c4a | 201 | if (!kept && preserve_links && S_ISLNK(file->mode)) { |
47d6a60c | 202 | extern int safe_symlinks; |
de0e2250 | 203 | if (safe_symlinks && unsafe_symlink(file->u.link, backup_dir_buf)) { |
47d6a60c S |
204 | if (verbose) { |
205 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", | |
de0e2250 | 206 | full_fname(backup_dir_buf), file->u.link); |
47d6a60c S |
207 | } |
208 | kept = 1; | |
209 | } | |
de0e2250 WD |
210 | make_bak_dir(backup_dir_buf); |
211 | if (do_symlink(file->u.link, backup_dir_buf) != 0) { | |
47d6a60c | 212 | rprintf(FERROR, "link %s -> %s : %s\n", |
de0e2250 | 213 | full_fname(backup_dir_buf), file->u.link, strerror(errno)); |
47d6a60c S |
214 | } |
215 | do_unlink(fname); | |
216 | kept = 1; | |
217 | } | |
378a074c | 218 | #endif |
378a074c | 219 | |
addf0c4a | 220 | if (!kept && !S_ISREG(file->mode)) { |
47d6a60c | 221 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
addf0c4a | 222 | fname); |
47d6a60c | 223 | } |
66203a98 | 224 | |
66203a98 | 225 | /* move to keep tree if a file */ |
addf0c4a | 226 | if (!kept) { |
9d78ed31 | 227 | if (robust_move(fname, backup_dir_buf) != 0) { |
ea42541f | 228 | rprintf(FERROR, "keep_backup failed: %s -> \"%s\": %s\n", |
de0e2250 | 229 | full_fname(fname), backup_dir_buf, strerror(errno)); |
47d6a60c S |
230 | } |
231 | } | |
de0e2250 | 232 | set_perms(backup_dir_buf, file, NULL, 0); |
9935066b | 233 | free(file); |
378a074c | 234 | |
66203a98 | 235 | if (verbose > 1) |
de0e2250 | 236 | rprintf(FINFO, "keep_backup %s -> %s\n", fname, backup_dir_buf); |
66203a98 | 237 | return 1; |
de0e2250 | 238 | } |
66203a98 AT |
239 | |
240 | ||
241 | /* main backup switch routine */ | |
242 | int make_backup(char *fname) | |
243 | { | |
244 | if (backup_dir) | |
addf0c4a WD |
245 | return keep_backup(fname); |
246 | return make_simple_backup(fname); | |
66203a98 | 247 | } |