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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; | |
24 | extern char *backup_suffix; | |
66203a98 | 25 | extern char *backup_dir; |
3d19b4c8 AT |
26 | |
27 | ||
378a074c AT |
28 | extern int am_root; |
29 | extern int preserve_devices; | |
30 | extern int preserve_links; | |
31 | extern int preserve_hard_links; | |
32 | ||
66203a98 AT |
33 | /* simple backup creates a backup with a suffix in the same directory */ |
34 | static int make_simple_backup(char *fname) | |
3d19b4c8 AT |
35 | { |
36 | char fnamebak[MAXPATHLEN]; | |
37 | if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) { | |
38 | rprintf(FERROR,"backup filename too long\n"); | |
39 | return 0; | |
40 | } | |
41 | ||
8950ac03 | 42 | snprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix); |
3d19b4c8 AT |
43 | if (do_rename(fname,fnamebak) != 0) { |
44 | /* cygwin (at least version b19) reports EINVAL */ | |
45 | if (errno != ENOENT && errno != EINVAL) { | |
a039749b | 46 | rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak); |
3d19b4c8 AT |
47 | return 0; |
48 | } | |
49 | } else if (verbose > 1) { | |
50 | rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak); | |
51 | } | |
52 | return 1; | |
53 | } | |
66203a98 AT |
54 | |
55 | ||
56 | /* recursively make a directory path */ | |
57 | static int make_dir(char *name, int mask) | |
58 | { | |
59 | char newdir [MAXPATHLEN]; | |
60 | char *p, *d; | |
61 | ||
62 | /* copy pathname over, look for last '/' */ | |
63 | for (p = d = newdir; *name; *d++ = *name++) | |
64 | if (*name == '/') | |
65 | p = d; | |
66 | if (p == newdir) | |
67 | return 0; | |
68 | *p = 0; | |
69 | ||
70 | /* make the new directory, if that fails then make its parent */ | |
71 | while (do_mkdir (newdir, mask) != 0) | |
72 | if ((errno != ENOENT) || !make_dir (newdir, mask)) | |
73 | return 0; | |
74 | ||
75 | return 1; | |
76 | } /* make_dir */ | |
77 | ||
78 | ||
378a074c AT |
79 | /**************************************************************************** |
80 | Create a directory given an absolute path, perms based upon another directory | |
81 | path | |
82 | ****************************************************************************/ | |
83 | static int make_bak_dir(char *fname,char *bak_path) | |
84 | { | |
85 | STRUCT_STAT st; | |
86 | STRUCT_STAT *st2; | |
87 | char fullpath[MAXPATHLEN]; | |
88 | extern int orig_umask; | |
89 | char *p; | |
90 | char *q; | |
91 | ||
92 | while(strncmp(bak_path,"./",2)==0) bak_path += 2; | |
93 | ||
94 | if(bak_path[strlen(bak_path)-1]!='/') { | |
8950ac03 | 95 | snprintf(fullpath,sizeof(fullpath),"%s/",bak_path); |
378a074c | 96 | } else { |
8950ac03 | 97 | snprintf(fullpath,sizeof(fullpath),"%s",bak_path); |
378a074c AT |
98 | } |
99 | p=fullpath; | |
100 | q=&fullpath[strlen(fullpath)]; /* End of bak_path string */ | |
101 | strcat(fullpath,fname); | |
102 | ||
103 | /* Make the directories */ | |
104 | while ((p=strchr(p,'/'))) { | |
105 | *p = 0; | |
106 | if(do_lstat(fullpath,&st)!=0) { | |
107 | do_mkdir(fullpath,0777 & ~orig_umask); | |
108 | if(p>q) { | |
109 | if(do_lstat(q,&st)!=0) { | |
110 | rprintf(FERROR,"make_bak_dir stat %s : %s\n",fullpath,strerror(errno)); | |
111 | } else { | |
112 | st2=&st; | |
113 | set_modtime(fullpath,st2->st_mtime); | |
114 | if(do_lchown(fullpath,st2->st_uid,st2->st_gid)!=0) { | |
115 | rprintf(FERROR,"make_bak_dir chown %s : %s\n",fullpath,strerror(errno)); | |
116 | }; | |
117 | if(do_chmod(fullpath,st2->st_mode)!=0) { | |
118 | rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",fullpath,strerror(errno)); | |
119 | }; | |
120 | }; | |
121 | } | |
122 | }; | |
123 | *p = '/'; | |
124 | p++; | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
66203a98 AT |
129 | /* robustly move a file, creating new directory structures if necessary */ |
130 | static int robust_move(char *src, char *dst) | |
131 | { | |
132 | int keep_trying = 4; | |
133 | int keep_path_extfs = 0; | |
134 | int failed; | |
135 | ||
136 | while (keep_trying) { | |
49d6fdc0 AT |
137 | if (keep_path_extfs) { |
138 | failed = copy_file(src, dst, 0755); | |
139 | if (!failed) { | |
140 | do_unlink(src); | |
141 | } | |
142 | } else { | |
66203a98 | 143 | failed = robust_rename (src, dst); |
49d6fdc0 | 144 | } |
66203a98 AT |
145 | |
146 | if (failed) { | |
147 | if (verbose > 2) | |
148 | rprintf (FERROR, "robust_move failed: %s(%d)\n", | |
149 | strerror (errno), errno); | |
150 | switch (errno) { | |
151 | /* external filesystem */ | |
152 | case EXDEV: | |
153 | keep_path_extfs = 1; | |
154 | keep_trying--; | |
155 | break; | |
156 | /* no directory to write to */ | |
157 | case ENOENT: | |
158 | make_dir (dst, 0755); | |
159 | keep_trying--; | |
160 | break; | |
161 | default: | |
162 | keep_trying = 0; | |
163 | } /* switch */ | |
164 | } else | |
165 | keep_trying = 0; | |
166 | } /* while */ | |
167 | return (!failed); | |
168 | } /* robust_move */ | |
169 | ||
170 | ||
171 | /* if we have a backup_dir, then we get here from make_backup(). | |
172 | We will move the file to be deleted into a parallel directory tree */ | |
173 | static int keep_backup(char *fname) | |
174 | { | |
378a074c | 175 | |
66203a98 AT |
176 | static int initialised; |
177 | ||
178 | char keep_name [MAXPATHLEN]; | |
179 | STRUCT_STAT st; | |
180 | struct file_struct *file; | |
181 | ||
378a074c AT |
182 | int kept=0; |
183 | int ret_code; | |
184 | ||
66203a98 AT |
185 | if (!initialised) { |
186 | if (backup_dir[strlen(backup_dir) - 1] == '/') | |
187 | backup_dir[strlen(backup_dir) - 1] = 0; | |
188 | if (verbose > 0) | |
189 | rprintf (FINFO, "backup_dir is %s\n", backup_dir); | |
190 | initialised = 1; | |
191 | } | |
192 | ||
193 | /* return if no file to keep */ | |
194 | #if SUPPORT_LINKS | |
195 | if (do_lstat (fname, &st)) return 1; | |
196 | #else | |
197 | if (do_stat (fname, &st)) return 1; | |
198 | #endif | |
199 | ||
f2cbf44b AT |
200 | file = make_file(-1, fname, NULL, 1); |
201 | ||
202 | /* the file could have disappeared */ | |
203 | if (!file) return 1; | |
66203a98 | 204 | |
378a074c AT |
205 | /* make a complete pathname for backup file */ |
206 | if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) { | |
207 | rprintf (FERROR, "keep_backup filename too long\n"); | |
208 | return 0; | |
209 | } | |
210 | ||
8950ac03 | 211 | snprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname); |
378a074c AT |
212 | |
213 | ||
214 | #ifdef HAVE_MKNOD | |
215 | /* Check to see if this is a device file, or link */ | |
216 | if(IS_DEVICE(file->mode)) { | |
217 | if(am_root && preserve_devices) { | |
218 | make_bak_dir(fname,backup_dir); | |
219 | if(do_mknod(keep_name,file->mode,file->rdev)!=0) { | |
220 | rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno)); | |
221 | } else { | |
222 | if(verbose>2) | |
223 | rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname); | |
224 | }; | |
225 | }; | |
226 | kept=1; | |
227 | do_unlink(fname); | |
228 | }; | |
229 | #endif | |
230 | ||
231 | if(!kept && S_ISDIR(file->mode)) { | |
232 | /* make an empty directory */ | |
233 | make_bak_dir(fname,backup_dir); | |
234 | do_mkdir(keep_name,file->mode); | |
235 | ret_code=do_rmdir(fname); | |
236 | if(verbose>2) | |
237 | rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code); | |
238 | kept=1; | |
239 | }; | |
240 | ||
241 | #if SUPPORT_LINKS | |
242 | if(!kept && preserve_links && S_ISLNK(file->mode)) { | |
243 | extern int safe_symlinks; | |
244 | if (safe_symlinks && unsafe_symlink(file->link, keep_name)) { | |
245 | if (verbose) { | |
246 | rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n", | |
247 | keep_name,file->link); | |
248 | } | |
249 | kept=1; | |
250 | } | |
251 | make_bak_dir(fname,backup_dir); | |
252 | if(do_symlink(file->link,keep_name) != 0) { | |
253 | rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno)); | |
254 | }; | |
255 | do_unlink(fname); | |
256 | kept=1; | |
257 | }; | |
258 | #endif | |
259 | if(!kept && preserve_hard_links && check_hard_link(file)) { | |
260 | if(verbose > 1) rprintf(FINFO,"%s is a hard link\n",f_name(file)); | |
261 | }; | |
262 | ||
263 | if(!kept && !S_ISREG(file->mode)) { | |
264 | rprintf(FINFO,"make_bak: skipping non-regular file %s\n",fname); | |
265 | } | |
66203a98 | 266 | |
66203a98 | 267 | /* move to keep tree if a file */ |
378a074c | 268 | if(!kept) { |
66203a98 AT |
269 | if (!robust_move (fname, keep_name)) |
270 | rprintf(FERROR, "keep_backup failed %s -> %s : %s\n", | |
271 | fname, keep_name, strerror(errno)); | |
378a074c | 272 | }; |
66203a98 AT |
273 | set_perms (keep_name, file, NULL, 0); |
274 | free_file (file); | |
275 | free (file); | |
378a074c | 276 | |
66203a98 AT |
277 | if (verbose > 1) |
278 | rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name); | |
279 | return 1; | |
280 | } /* keep_backup */ | |
281 | ||
282 | ||
283 | /* main backup switch routine */ | |
284 | int make_backup(char *fname) | |
285 | { | |
286 | if (backup_dir) | |
287 | return (keep_backup(fname)); | |
288 | else | |
289 | return (make_simple_backup(fname)); | |
290 | } | |
291 |