1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*
Copyright (C) Andrew Tridgell 1999
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* backup handling code */
#include "rsync.h"
extern int verbose;
extern int backup_suffix_len;
extern int backup_dir_len;
extern unsigned int backup_dir_remainder;
extern char backup_dir_buf[MAXPATHLEN];
extern char *backup_suffix;
extern char *backup_dir;
extern int am_root;
extern int preserve_devices;
extern int preserve_links;
extern int preserve_hard_links;
extern int orig_umask;
extern int safe_symlinks;
/* simple backup creates a backup with a suffix in the same directory */
static int make_simple_backup(char *fname)
{
char fnamebak[MAXPATHLEN];
if (stringjoin(fnamebak, sizeof fnamebak, fname, backup_suffix, NULL)
>= sizeof fnamebak) {
rprintf(FERROR, "backup filename too long\n");
return 0;
}
if (do_rename(fname, fnamebak) != 0) {
/* cygwin (at least version b19) reports EINVAL */
if (errno != ENOENT && errno != EINVAL) {
rsyserr(FERROR, errno,
"rename %s to backup %s", fname, fnamebak);
return 0;
}
} else if (verbose > 1) {
rprintf(FINFO, "backed up %s to %s\n", fname, fnamebak);
}
return 1;
}
/****************************************************************************
Create a directory given an absolute path, perms based upon another directory
path
****************************************************************************/
static int make_bak_dir(char *fullpath)
{
STRUCT_STAT st;
char *rel = fullpath + backup_dir_len;
char *end = rel + strlen(rel);
char *p = end;
while (strncmp(fullpath, "./", 2) == 0)
fullpath += 2;
/* Try to find an existing dir, starting from the deepest dir. */
while (1) {
if (--p == fullpath) {
p += strlen(p);
goto failure;
}
if (*p == '/') {
*p = '\0';
if (do_mkdir(fullpath, 0777 & ~orig_umask) == 0)
break;
if (errno != ENOENT) {
rsyserr(FERROR, errno,
"make_bak_dir mkdir %s failed",
full_fname(fullpath));
goto failure;
}
}
}
/* Make all the dirs that we didn't find on the way here. */
while (1) {
if (p >= rel) {
/* Try to transfer the directory settings of the
* actual dir that the files are coming from. */
if (do_stat(rel, &st) < 0) {
rsyserr(FERROR, errno,
"make_bak_dir stat %s failed",
full_fname(rel));
} else {
do_lchown(fullpath, st.st_uid, st.st_gid);
do_chmod(fullpath, st.st_mode);
}
}
*p = '/';
p += strlen(p);
if (p == end)
break;
if (do_mkdir(fullpath, 0777 & ~orig_umask) < 0) {
rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed",
full_fname(fullpath));
goto failure;
}
}
return 0;
failure:
while (p != end) {
*p = '/';
p += strlen(p);
}
return -1;
}
/* robustly move a file, creating new directory structures if necessary */
static int robust_move(char *src, char *dst)
{
if (robust_rename(src, dst, 0755) < 0 && (errno != ENOENT
|| make_bak_dir(dst) < 0 || robust_rename(src, dst, 0755) < 0))
return -1;
return 0;
}
/* If we have a --backup-dir, then we get here from make_backup().
* We will move the file to be deleted into a parallel directory tree. */
static int keep_backup(char *fname)
{
STRUCT_STAT st;
struct file_struct *file;
int kept = 0;
int ret_code;
/* return if no file to keep */
#if SUPPORT_LINKS
ret_code = do_lstat(fname, &st);
#else
ret_code = do_stat(fname, &st);
#endif
if (ret_code < 0)
return 1;
file = make_file(fname, NULL, NO_EXCLUDES);
/* the file could have disappeared */
if (!file) return 1;
/* make a complete pathname for backup file */
if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder,
fname, backup_suffix, NULL) >= backup_dir_remainder) {
rprintf(FERROR, "keep_backup filename too long\n");
return 0;
}
#ifdef HAVE_MKNOD
/* Check to see if this is a device file, or link */
if (IS_DEVICE(file->mode)) {
if (am_root && preserve_devices) {
if (do_mknod(backup_dir_buf, file->mode, file->u.rdev) < 0
&& (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
|| do_mknod(backup_dir_buf, file->mode, file->u.rdev) < 0)) {
rsyserr(FERROR, errno, "mknod %s failed",
full_fname(backup_dir_buf));
} else if (verbose > 2) {
rprintf(FINFO,
"make_backup: DEVICE %s successful.\n",
fname);
}
}
kept = 1;
do_unlink(fname);
}
#endif
if (!kept && S_ISDIR(file->mode)) {
/* make an empty directory */
if (do_mkdir(backup_dir_buf, file->mode) < 0
&& (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
|| do_mkdir(backup_dir_buf, file->mode) < 0)) {
rsyserr(FINFO, errno, "mkdir %s failed",
full_fname(backup_dir_buf));
}
ret_code = do_rmdir(fname);
if (verbose > 2) {
rprintf(FINFO, "make_backup: RMDIR %s returns %i\n",
full_fname(fname), ret_code);
}
kept = 1;
}
#if SUPPORT_LINKS
if (!kept && preserve_links && S_ISLNK(file->mode)) {
if (safe_symlinks && unsafe_symlink(file->u.link, backup_dir_buf)) {
if (verbose) {
rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n",
full_fname(backup_dir_buf), file->u.link);
}
kept = 1;
}
if (do_symlink(file->u.link, backup_dir_buf) < 0
&& (errno != ENOENT || make_bak_dir(backup_dir_buf) < 0
|| do_symlink(file->u.link, backup_dir_buf) < 0)) {
rsyserr(FERROR, errno, "link %s -> \"%s\"",
full_fname(backup_dir_buf), file->u.link);
}
do_unlink(fname);
kept = 1;
}
#endif
if (!kept && !S_ISREG(file->mode)) {
rprintf(FINFO, "make_bak: skipping non-regular file %s\n",
fname);
}
/* move to keep tree if a file */
if (!kept) {
if (robust_move(fname, backup_dir_buf) != 0) {
rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
full_fname(fname), backup_dir_buf);
}
}
set_perms(backup_dir_buf, file, NULL, 0);
free(file);
if (verbose > 1)
rprintf(FINFO, "keep_backup %s -> %s\n", fname, backup_dir_buf);
return 1;
}
/* main backup switch routine */
int make_backup(char *fname)
{
if (backup_dir)
return keep_backup(fname);
return make_simple_backup(fname);
}
|
