Annotation of embedaddon/rsync/backup.c, revision 1.1.1.2
1.1 misho 1: /*
2: * Backup handling code.
3: *
4: * Copyright (C) 1999 Andrew Tridgell
1.1.1.2 ! misho 5: * Copyright (C) 2003-2013 Wayne Davison
1.1 misho 6: *
7: * This program is free software; you can redistribute it and/or modify
8: * it under the terms of the GNU General Public License as published by
9: * the Free Software Foundation; either version 3 of the License, or
10: * (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License along
18: * with this program; if not, visit the http://fsf.org website.
19: */
20:
21: #include "rsync.h"
1.1.1.2 ! misho 22: #include "ifuncs.h"
1.1 misho 23:
24: extern int am_root;
25: extern int preserve_acls;
26: extern int preserve_xattrs;
27: extern int preserve_devices;
28: extern int preserve_specials;
29: extern int preserve_links;
30: extern int safe_symlinks;
31: extern int backup_dir_len;
32: extern unsigned int backup_dir_remainder;
33: extern char backup_dir_buf[MAXPATHLEN];
34: extern char *backup_suffix;
35: extern char *backup_dir;
36:
1.1.1.2 ! misho 37: /* Returns -1 on error, 0 on missing dir, and 1 on present dir. */
! 38: static int validate_backup_dir(void)
1.1 misho 39: {
1.1.1.2 ! misho 40: STRUCT_STAT st;
1.1 misho 41:
1.1.1.2 ! misho 42: if (do_lstat(backup_dir_buf, &st) < 0) {
! 43: if (errno == ENOENT)
! 44: return 0;
! 45: rsyserr(FERROR, errno, "backup lstat %s failed", backup_dir_buf);
! 46: return -1;
! 47: }
! 48: if (!S_ISDIR(st.st_mode)) {
! 49: int flags = get_del_for_flag(st.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE;
! 50: if (delete_item(backup_dir_buf, st.st_mode, flags) == 0)
! 51: return 0;
! 52: return -1;
1.1 misho 53: }
54: return 1;
55: }
56:
1.1.1.2 ! misho 57: /* Create a backup path from the given fname, putting the result into
! 58: * backup_dir_buf. Any new directories (compared to the prior backup
! 59: * path) are ensured to exist as directories, replacing anything else
! 60: * that may be in the way (e.g. a symlink). */
! 61: static BOOL copy_valid_path(const char *fname)
1.1 misho 62: {
1.1.1.2 ! misho 63: const char *f;
! 64: int val;
! 65: BOOL ret = True;
1.1 misho 66: stat_x sx;
1.1.1.2 ! misho 67: char *b, *rel = backup_dir_buf + backup_dir_len, *name = rel;
1.1 misho 68:
1.1.1.2 ! misho 69: for (f = fname, b = rel; *f && *f == *b; f++, b++) {
! 70: if (*b == '/')
! 71: name = b + 1;
1.1 misho 72: }
73:
1.1.1.2 ! misho 74: if (stringjoin(rel, backup_dir_remainder, fname, backup_suffix, NULL) >= backup_dir_remainder) {
! 75: rprintf(FERROR, "backup filename too long\n");
! 76: *name = '\0';
! 77: return False;
! 78: }
1.1 misho 79:
1.1.1.2 ! misho 80: for ( ; ; name = b + 1) {
! 81: if ((b = strchr(name, '/')) == NULL)
! 82: return True;
! 83: *b = '\0';
1.1 misho 84:
1.1.1.2 ! misho 85: val = validate_backup_dir();
! 86: if (val == 0)
! 87: break;
! 88: if (val < 0) {
! 89: *name = '\0';
! 90: return False;
1.1 misho 91: }
1.1.1.2 ! misho 92:
! 93: *b = '/';
1.1 misho 94: }
95:
1.1.1.2 ! misho 96: init_stat_x(&sx);
! 97:
! 98: for ( ; b; name = b + 1, b = strchr(name, '/')) {
! 99: *b = '\0';
! 100:
! 101: while (do_mkdir(backup_dir_buf, ACCESSPERMS) < 0) {
! 102: if (errno == EEXIST) {
! 103: val = validate_backup_dir();
! 104: if (val > 0)
! 105: break;
! 106: if (val == 0)
1.1 misho 107: continue;
1.1.1.2 ! misho 108: } else
! 109: rsyserr(FERROR, errno, "backup mkdir %s failed", backup_dir_buf);
! 110: *name = '\0';
! 111: ret = False;
! 112: goto cleanup;
! 113: }
! 114:
! 115: /* Try to transfer the directory settings of the actual dir
! 116: * that the files are coming from. */
! 117: if (x_stat(rel, &sx.st, NULL) < 0)
! 118: rsyserr(FERROR, errno, "backup stat %s failed", full_fname(rel));
! 119: else {
! 120: struct file_struct *file;
! 121: if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS)))
! 122: continue;
1.1 misho 123: #ifdef SUPPORT_ACLS
1.1.1.2 ! misho 124: if (preserve_acls && !S_ISLNK(file->mode)) {
! 125: get_acl(rel, &sx);
! 126: cache_tmp_acl(file, &sx);
! 127: free_acl(&sx);
! 128: }
1.1 misho 129: #endif
130: #ifdef SUPPORT_XATTRS
1.1.1.2 ! misho 131: if (preserve_xattrs) {
! 132: get_xattr(rel, &sx);
! 133: cache_tmp_xattr(file, &sx);
! 134: free_xattr(&sx);
! 135: }
1.1 misho 136: #endif
1.1.1.2 ! misho 137: set_file_attrs(backup_dir_buf, file, NULL, NULL, 0);
! 138: unmake_file(file);
! 139: }
! 140:
! 141: *b = '/';
! 142: }
! 143:
! 144: cleanup:
! 145:
1.1 misho 146: #ifdef SUPPORT_ACLS
1.1.1.2 ! misho 147: uncache_tmp_acls();
1.1 misho 148: #endif
149: #ifdef SUPPORT_XATTRS
1.1.1.2 ! misho 150: uncache_tmp_xattrs();
1.1 misho 151: #endif
1.1.1.2 ! misho 152:
! 153: return ret;
! 154: }
! 155:
! 156: /* Make a complete pathname for backup file and verify any new path elements. */
! 157: char *get_backup_name(const char *fname)
! 158: {
! 159: if (backup_dir) {
! 160: /* copy fname into backup_dir_buf while validating the dirs. */
! 161: if (copy_valid_path(fname))
! 162: return backup_dir_buf;
! 163: /* copy_valid_path() has printed an error message. */
! 164: return NULL;
1.1 misho 165: }
166:
1.1.1.2 ! misho 167: if (stringjoin(backup_dir_buf, MAXPATHLEN, fname, backup_suffix, NULL) < MAXPATHLEN)
! 168: return backup_dir_buf;
! 169:
! 170: rprintf(FERROR, "backup filename too long\n");
! 171: return NULL;
1.1 misho 172: }
173:
1.1.1.2 ! misho 174: /* Has same return codes as make_backup(). */
! 175: static inline int link_or_rename(const char *from, const char *to,
! 176: BOOL prefer_rename, STRUCT_STAT *stp)
1.1 misho 177: {
1.1.1.2 ! misho 178: #ifdef SUPPORT_HARD_LINKS
! 179: if (!prefer_rename) {
! 180: #ifndef CAN_HARDLINK_SYMLINK
! 181: if (S_ISLNK(stp->st_mode))
! 182: return 0; /* Use copy code. */
! 183: #endif
! 184: #ifndef CAN_HARDLINK_SPECIAL
! 185: if (IS_SPECIAL(stp->st_mode) || IS_DEVICE(stp->st_mode))
! 186: return 0; /* Use copy code. */
! 187: #endif
! 188: if (do_link(from, to) == 0) {
! 189: if (DEBUG_GTE(BACKUP, 1))
! 190: rprintf(FINFO, "make_backup: HLINK %s successful.\n", from);
! 191: return 2;
! 192: }
! 193: /* We prefer to rename a regular file rather than copy it. */
! 194: if (!S_ISREG(stp->st_mode) || errno == EEXIST || errno == EISDIR)
! 195: return 0;
! 196: }
! 197: #endif
! 198: if (do_rename(from, to) == 0) {
! 199: if (stp->st_nlink > 1 && !S_ISDIR(stp->st_mode)) {
! 200: /* If someone has hard-linked the file into the backup
! 201: * dir, rename() might return success but do nothing! */
! 202: robust_unlink(from); /* Just in case... */
1.1 misho 203: }
1.1.1.2 ! misho 204: if (DEBUG_GTE(BACKUP, 1))
! 205: rprintf(FINFO, "make_backup: RENAME %s successful.\n", from);
! 206: return 1;
1.1 misho 207: }
208: return 0;
209: }
210:
1.1.1.2 ! misho 211: /* Hard-link, rename, or copy an item to the backup name. Returns 2 if item
! 212: * was duplicated into backup area, 1 if item was moved, or 0 for failure.*/
! 213: int make_backup(const char *fname, BOOL prefer_rename)
1.1 misho 214: {
215: stat_x sx;
216: struct file_struct *file;
1.1.1.2 ! misho 217: int save_preserve_xattrs;
! 218: char *buf = get_backup_name(fname);
! 219: int ret = 0;
1.1 misho 220:
1.1.1.2 ! misho 221: if (!buf)
! 222: return 0;
! 223:
! 224: init_stat_x(&sx);
! 225: /* Return success if no file to keep. */
1.1 misho 226: if (x_lstat(fname, &sx.st, NULL) < 0)
227: return 1;
228:
1.1.1.2 ! misho 229: /* Try a hard-link or a rename first. Using rename is not atomic, but
! 230: * is more efficient than forcing a copy for larger files when no hard-
! 231: * linking is possible. */
! 232: if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
! 233: goto success;
! 234: if (errno == EEXIST || errno == EISDIR) {
! 235: STRUCT_STAT bakst;
! 236: if (do_lstat(buf, &bakst) == 0) {
! 237: int flags = get_del_for_flag(bakst.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE;
! 238: if (delete_item(buf, bakst.st_mode, flags) != 0)
! 239: return 0;
! 240: }
! 241: if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0)
! 242: goto success;
1.1 misho 243: }
244:
1.1.1.2 ! misho 245: /* Fall back to making a copy. */
! 246: if (!(file = make_file(fname, NULL, &sx.st, 0, NO_FILTERS)))
! 247: return 1; /* the file could have disappeared */
! 248:
1.1 misho 249: #ifdef SUPPORT_ACLS
250: if (preserve_acls && !S_ISLNK(file->mode)) {
251: get_acl(fname, &sx);
252: cache_tmp_acl(file, &sx);
253: free_acl(&sx);
254: }
255: #endif
256: #ifdef SUPPORT_XATTRS
257: if (preserve_xattrs) {
258: get_xattr(fname, &sx);
259: cache_tmp_xattr(file, &sx);
260: free_xattr(&sx);
261: }
262: #endif
263:
264: /* Check to see if this is a device file, or link */
265: if ((am_root && preserve_devices && IS_DEVICE(file->mode))
266: || (preserve_specials && IS_SPECIAL(file->mode))) {
1.1.1.2 ! misho 267: if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0)
! 268: rsyserr(FERROR, errno, "mknod %s failed", full_fname(buf));
! 269: else if (DEBUG_GTE(BACKUP, 1))
! 270: rprintf(FINFO, "make_backup: DEVICE %s successful.\n", fname);
! 271: ret = 2;
1.1 misho 272: }
273:
274: #ifdef SUPPORT_LINKS
1.1.1.2 ! misho 275: if (!ret && preserve_links && S_ISLNK(file->mode)) {
1.1 misho 276: const char *sl = F_SYMLINK(file);
277: if (safe_symlinks && unsafe_symlink(sl, fname)) {
1.1.1.2 ! misho 278: if (INFO_GTE(SYMSAFE, 1)) {
1.1 misho 279: rprintf(FINFO, "not backing up unsafe symlink \"%s\" -> \"%s\"\n",
280: fname, sl);
281: }
1.1.1.2 ! misho 282: ret = 2;
1.1 misho 283: } else {
1.1.1.2 ! misho 284: if (do_symlink(sl, buf) < 0)
! 285: rsyserr(FERROR, errno, "link %s -> \"%s\"", full_fname(buf), sl);
! 286: else if (DEBUG_GTE(BACKUP, 1))
! 287: rprintf(FINFO, "make_backup: SYMLINK %s successful.\n", fname);
! 288: ret = 2;
1.1 misho 289: }
290: }
291: #endif
292:
1.1.1.2 ! misho 293: if (!ret && !S_ISREG(file->mode)) {
! 294: rprintf(FINFO, "make_bak: skipping non-regular file %s\n", fname);
1.1 misho 295: unmake_file(file);
296: #ifdef SUPPORT_ACLS
297: uncache_tmp_acls();
298: #endif
299: #ifdef SUPPORT_XATTRS
300: uncache_tmp_xattrs();
301: #endif
1.1.1.2 ! misho 302: return 2;
1.1 misho 303: }
304:
1.1.1.2 ! misho 305: /* Copy to backup tree if a file. */
! 306: if (!ret) {
! 307: if (copy_file(fname, buf, -1, file->mode) < 0) {
1.1 misho 308: rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"",
309: full_fname(fname), buf);
1.1.1.2 ! misho 310: unmake_file(file);
! 311: #ifdef SUPPORT_ACLS
! 312: uncache_tmp_acls();
! 313: #endif
! 314: #ifdef SUPPORT_XATTRS
! 315: uncache_tmp_xattrs();
! 316: #endif
! 317: return 0;
1.1 misho 318: }
1.1.1.2 ! misho 319: if (DEBUG_GTE(BACKUP, 1))
! 320: rprintf(FINFO, "make_backup: COPY %s successful.\n", fname);
! 321: ret = 2;
1.1 misho 322: }
1.1.1.2 ! misho 323:
! 324: save_preserve_xattrs = preserve_xattrs;
1.1 misho 325: preserve_xattrs = 0;
326: set_file_attrs(buf, file, NULL, fname, 0);
327: preserve_xattrs = save_preserve_xattrs;
1.1.1.2 ! misho 328:
1.1 misho 329: unmake_file(file);
330: #ifdef SUPPORT_ACLS
331: uncache_tmp_acls();
332: #endif
333: #ifdef SUPPORT_XATTRS
334: uncache_tmp_xattrs();
335: #endif
336:
1.1.1.2 ! misho 337: success:
! 338: if (INFO_GTE(BACKUP, 1))
! 339: rprintf(FINFO, "backed up %s to %s\n", fname, buf);
! 340: return ret;
1.1 misho 341: }
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