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3d19b4c8 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1999 | |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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; | |
759ac870 | 24 | extern int suffix_specified; |
3d19b4c8 | 25 | extern char *backup_suffix; |
66203a98 | 26 | extern char *backup_dir; |
3d19b4c8 AT |
27 | |
28 | ||
378a074c AT |
29 | extern int am_root; |
30 | extern int preserve_devices; | |
31 | extern int preserve_links; | |
32 | extern int preserve_hard_links; | |
33 | ||
66203a98 AT |
34 | /* simple backup creates a backup with a suffix in the same directory */ |
35 | static int make_simple_backup(char *fname) | |
3d19b4c8 AT |
36 | { |
37 | char fnamebak[MAXPATHLEN]; | |
38 | if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) { | |
39 | rprintf(FERROR,"backup filename too long\n"); | |
40 | return 0; | |
41 | } | |
42 | ||
8950ac03 | 43 | snprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix); |
3d19b4c8 AT |
44 | if (do_rename(fname,fnamebak) != 0) { |
45 | /* cygwin (at least version b19) reports EINVAL */ | |
46 | if (errno != ENOENT && errno != EINVAL) { | |
a039749b | 47 | rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak); |
3d19b4c8 AT |
48 | return 0; |
49 | } | |
50 | } else if (verbose > 1) { | |
51 | rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak); | |
52 | } | |
53 | return 1; | |
54 | } | |
66203a98 AT |
55 | |
56 | ||
57 | /* recursively make a directory path */ | |
58 | static int make_dir(char *name, int mask) | |
59 | { | |
60 | char newdir [MAXPATHLEN]; | |
61 | char *p, *d; | |
62 | ||
63 | /* copy pathname over, look for last '/' */ | |
64 | for (p = d = newdir; *name; *d++ = *name++) | |
65 | if (*name == '/') | |
66 | p = d; | |
67 | if (p == newdir) | |
68 | return 0; | |
69 | *p = 0; | |
70 | ||
71 | /* make the new directory, if that fails then make its parent */ | |
72 | while (do_mkdir (newdir, mask) != 0) | |
73 | if ((errno != ENOENT) || !make_dir (newdir, mask)) | |
74 | return 0; | |
75 | ||
76 | return 1; | |
77 | } /* make_dir */ | |
78 | ||
79 | ||
378a074c AT |
80 | /**************************************************************************** |
81 | Create a directory given an absolute path, perms based upon another directory | |
82 | path | |
83 | ****************************************************************************/ | |
84 | static int make_bak_dir(char *fname,char *bak_path) | |
85 | { | |
86 | STRUCT_STAT st; | |
87 | STRUCT_STAT *st2; | |
88 | char fullpath[MAXPATHLEN]; | |
89 | extern int orig_umask; | |
90 | char *p; | |
91 | char *q; | |
92 | ||
93 | while(strncmp(bak_path,"./",2)==0) bak_path += 2; | |
94 | ||
95 | if(bak_path[strlen(bak_path)-1]!='/') { | |
8950ac03 | 96 | snprintf(fullpath,sizeof(fullpath),"%s/",bak_path); |
378a074c | 97 | } else { |
8950ac03 | 98 | snprintf(fullpath,sizeof(fullpath),"%s",bak_path); |
378a074c AT |
99 | } |
100 | p=fullpath; | |
101 | q=&fullpath[strlen(fullpath)]; /* End of bak_path string */ | |
102 | strcat(fullpath,fname); | |
103 | ||
104 | /* Make the directories */ | |
105 | while ((p=strchr(p,'/'))) { | |
106 | *p = 0; | |
107 | if(do_lstat(fullpath,&st)!=0) { | |
108 | do_mkdir(fullpath,0777 & ~orig_umask); | |
109 | if(p>q) { | |
110 | if(do_lstat(q,&st)!=0) { | |
111 | rprintf(FERROR,"make_bak_dir stat %s : %s\n",fullpath,strerror(errno)); | |
112 | } else { | |
113 | st2=&st; | |
114 | set_modtime(fullpath,st2->st_mtime); | |
115 | if(do_lchown(fullpath,st2->st_uid,st2->st_gid)!=0) { | |
116 | rprintf(FERROR,"make_bak_dir chown %s : %s\n",fullpath,strerror(errno)); | |
117 | }; | |
118 | if(do_chmod(fullpath,st2->st_mode)!=0) { | |
119 | rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",fullpath,strerror(errno)); | |
120 | }; | |
121 | }; | |
122 | } | |
123 | }; | |
124 | *p = '/'; | |
125 | p++; | |
126 | } | |
127 | return 0; | |
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 | { | |
133 | int keep_trying = 4; | |
134 | int keep_path_extfs = 0; | |
135 | int failed; | |
136 | ||
137 | while (keep_trying) { | |
49d6fdc0 AT |
138 | if (keep_path_extfs) { |
139 | failed = copy_file(src, dst, 0755); | |
140 | if (!failed) { | |
141 | do_unlink(src); | |
142 | } | |
143 | } else { | |
66203a98 | 144 | failed = robust_rename (src, dst); |
49d6fdc0 | 145 | } |
66203a98 AT |
146 | |
147 | if (failed) { | |
148 | if (verbose > 2) | |
149 | rprintf (FERROR, "robust_move failed: %s(%d)\n", | |
150 | strerror (errno), errno); | |
151 | switch (errno) { | |
152 | /* external filesystem */ | |
153 | case EXDEV: | |
154 | keep_path_extfs = 1; | |
155 | keep_trying--; | |
156 | break; | |
157 | /* no directory to write to */ | |
158 | case ENOENT: | |
159 | make_dir (dst, 0755); | |
160 | keep_trying--; | |
161 | break; | |
162 | default: | |
163 | keep_trying = 0; | |
164 | } /* switch */ | |
165 | } else | |
166 | keep_trying = 0; | |
167 | } /* while */ | |
168 | return (!failed); | |
169 | } /* robust_move */ | |
170 | ||
171 | ||
172 | /* if we have a backup_dir, then we get here from make_backup(). | |
173 | We will move the file to be deleted into a parallel directory tree */ | |
174 | static int keep_backup(char *fname) | |
175 | { | |
378a074c | 176 | |
66203a98 AT |
177 | static int initialised; |
178 | ||
179 | char keep_name [MAXPATHLEN]; | |
180 | STRUCT_STAT st; | |
181 | struct file_struct *file; | |
182 | ||
378a074c AT |
183 | int kept=0; |
184 | int ret_code; | |
185 | ||
66203a98 AT |
186 | if (!initialised) { |
187 | if (backup_dir[strlen(backup_dir) - 1] == '/') | |
188 | backup_dir[strlen(backup_dir) - 1] = 0; | |
189 | if (verbose > 0) | |
190 | rprintf (FINFO, "backup_dir is %s\n", backup_dir); | |
191 | initialised = 1; | |
192 | } | |
193 | ||
194 | /* return if no file to keep */ | |
195 | #if SUPPORT_LINKS | |
196 | if (do_lstat (fname, &st)) return 1; | |
197 | #else | |
198 | if (do_stat (fname, &st)) return 1; | |
199 | #endif | |
200 | ||
f2cbf44b AT |
201 | file = make_file(-1, fname, NULL, 1); |
202 | ||
203 | /* the file could have disappeared */ | |
204 | if (!file) return 1; | |
66203a98 | 205 | |
378a074c | 206 | /* make a complete pathname for backup file */ |
759ac870 DD |
207 | if (strlen(backup_dir) + strlen(fname) + |
208 | (suffix_specified ? strlen(backup_suffix) : 0) > (MAXPATHLEN - 1)) { | |
378a074c AT |
209 | rprintf (FERROR, "keep_backup filename too long\n"); |
210 | return 0; | |
211 | } | |
212 | ||
759ac870 DD |
213 | if (suffix_specified) { |
214 | snprintf(keep_name, sizeof (keep_name), "%s/%s%s", backup_dir, fname, backup_suffix); | |
215 | } else { | |
216 | snprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname); | |
217 | } | |
378a074c AT |
218 | |
219 | ||
220 | #ifdef HAVE_MKNOD | |
221 | /* Check to see if this is a device file, or link */ | |
222 | if(IS_DEVICE(file->mode)) { | |
223 | if(am_root && preserve_devices) { | |
224 | make_bak_dir(fname,backup_dir); | |
225 | if(do_mknod(keep_name,file->mode,file->rdev)!=0) { | |
226 | rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno)); | |
227 | } else { | |
228 | if(verbose>2) | |
229 | rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname); | |
230 | }; | |
231 | }; | |
232 | kept=1; | |
233 | do_unlink(fname); | |
234 | }; | |
235 | #endif | |
236 | ||
237 | if(!kept && S_ISDIR(file->mode)) { | |
238 | /* make an empty directory */ | |
239 | make_bak_dir(fname,backup_dir); | |
240 | do_mkdir(keep_name,file->mode); | |
241 | ret_code=do_rmdir(fname); | |
242 | if(verbose>2) | |
243 | rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code); | |
244 | kept=1; | |
245 | }; | |
246 | ||
247 | #if SUPPORT_LINKS | |
248 | if(!kept && preserve_links && S_ISLNK(file->mode)) { | |
249 | extern int safe_symlinks; | |
250 | if (safe_symlinks && unsafe_symlink(file->link, keep_name)) { | |
251 | if (verbose) { | |
252 | rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n", | |
253 | keep_name,file->link); | |
254 | } | |
255 | kept=1; | |
256 | } | |
257 | make_bak_dir(fname,backup_dir); | |
258 | if(do_symlink(file->link,keep_name) != 0) { | |
259 | rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno)); | |
260 | }; | |
261 | do_unlink(fname); | |
262 | kept=1; | |
263 | }; | |
264 | #endif | |
265 | if(!kept && preserve_hard_links && check_hard_link(file)) { | |
266 | if(verbose > 1) rprintf(FINFO,"%s is a hard link\n",f_name(file)); | |
267 | }; | |
268 | ||
269 | if(!kept && !S_ISREG(file->mode)) { | |
270 | rprintf(FINFO,"make_bak: skipping non-regular file %s\n",fname); | |
271 | } | |
66203a98 | 272 | |
66203a98 | 273 | /* move to keep tree if a file */ |
378a074c | 274 | if(!kept) { |
66203a98 AT |
275 | if (!robust_move (fname, keep_name)) |
276 | rprintf(FERROR, "keep_backup failed %s -> %s : %s\n", | |
277 | fname, keep_name, strerror(errno)); | |
378a074c | 278 | }; |
66203a98 AT |
279 | set_perms (keep_name, file, NULL, 0); |
280 | free_file (file); | |
281 | free (file); | |
378a074c | 282 | |
66203a98 AT |
283 | if (verbose > 1) |
284 | rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name); | |
285 | return 1; | |
286 | } /* keep_backup */ | |
287 | ||
288 | ||
289 | /* main backup switch routine */ | |
290 | int make_backup(char *fname) | |
291 | { | |
292 | if (backup_dir) | |
293 | return (keep_backup(fname)); | |
294 | else | |
295 | return (make_simple_backup(fname)); | |
296 | } | |
297 |