X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/b7c33e3bdea743c1d9fe1fb66f2f3929ab59fd31..0f78b81511be65d8fe21af1e6ac674f9e80ac29d:/backup.c diff --git a/backup.c b/backup.c index 9c6fd894..b8223583 100644 --- a/backup.c +++ b/backup.c @@ -1,288 +1,280 @@ -/* - 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 */ +/* + * Backup handling code. + * + * Copyright (C) 1999 Andrew Tridgell + * Copyright (C) 2003, 2004, 2005, 2006 Wayne Davison + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ #include "rsync.h" extern int verbose; +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_specials; extern int preserve_links; -extern int preserve_hard_links; +extern int safe_symlinks; -/* simple backup creates a backup with a suffix in the same directory */ -static int make_simple_backup(char *fname) +/* make a complete pathname for backup file */ +char *get_backup_name(char *fname) { - char fnamebak[MAXPATHLEN]; - if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) { - rprintf(FERROR,"backup filename too long\n"); - return 0; + if (backup_dir) { + if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder, + fname, backup_suffix, NULL) < backup_dir_remainder) + return backup_dir_buf; + } else { + if (stringjoin(backup_dir_buf, MAXPATHLEN, + fname, backup_suffix, NULL) < MAXPATHLEN) + return backup_dir_buf; } - slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix); - if (do_rename(fname,fnamebak) != 0) { - /* cygwin (at least version b19) reports EINVAL */ - if (errno != ENOENT && errno != EINVAL) { - rprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno)); - return 0; - } - } else if (verbose > 1) { - rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak); - } - return 1; + rprintf(FERROR, "backup filename too long\n"); + return NULL; } - -/* recursively make a directory path */ -static int make_dir(char *name, int mask) +/* simple backup creates a backup with a suffix in the same directory */ +static int make_simple_backup(char *fname) { - char newdir [MAXPATHLEN]; - char *p, *d; - - /* copy pathname over, look for last '/' */ - for (p = d = newdir; *name; *d++ = *name++) - if (*name == '/') - p = d; - if (p == newdir) + int rename_errno; + char *fnamebak = get_backup_name(fname); + + if (!fnamebak) return 0; - *p = 0; - /* make the new directory, if that fails then make its parent */ - while (do_mkdir (newdir, mask) != 0) - if ((errno != ENOENT) || !make_dir (newdir, mask)) - return 0; + while (1) { + if (do_rename(fname, fnamebak) == 0) { + if (verbose > 1) { + rprintf(FINFO, "backed up %s to %s\n", + fname, fnamebak); + } + break; + } + /* cygwin (at least version b19) reports EINVAL */ + if (errno == ENOENT || errno == EINVAL) + break; + + rename_errno = errno; + if (errno == EISDIR && do_rmdir(fnamebak) == 0) + continue; + if (errno == ENOTDIR && do_unlink(fnamebak) == 0) + continue; + + rsyserr(FERROR, rename_errno, "rename %s to backup %s", + fname, fnamebak); + errno = rename_errno; + return 0; + } return 1; -} /* make_dir */ +} /**************************************************************************** Create a directory given an absolute path, perms based upon another directory path ****************************************************************************/ -static int make_bak_dir(char *fname,char *bak_path) +static int make_bak_dir(char *fullpath) { - STRUCT_STAT st; - STRUCT_STAT *st2; - char fullpath[MAXPATHLEN]; - extern int orig_umask; - char *p; - char *q; - - while(strncmp(bak_path,"./",2)==0) bak_path += 2; - - if(bak_path[strlen(bak_path)-1]!='/') { - slprintf(fullpath,sizeof(fullpath),"%s/",bak_path); - } else { - slprintf(fullpath,sizeof(fullpath),"%s",bak_path); - } - p=fullpath; - q=&fullpath[strlen(fullpath)]; /* End of bak_path string */ - strcat(fullpath,fname); - - /* Make the directories */ - while ((p=strchr(p,'/'))) { - *p = 0; - if(do_lstat(fullpath,&st)!=0) { - do_mkdir(fullpath,0777 & ~orig_umask); - if(p>q) { - if(do_lstat(q,&st)!=0) { - rprintf(FERROR,"make_bak_dir stat %s : %s\n",fullpath,strerror(errno)); - } else { - st2=&st; - set_modtime(fullpath,st2->st_mtime); - if(do_lchown(fullpath,st2->st_uid,st2->st_gid)!=0) { - rprintf(FERROR,"make_bak_dir chown %s : %s\n",fullpath,strerror(errno)); - }; - if(do_chmod(fullpath,st2->st_mode)!=0) { - rprintf(FERROR,"make_bak_dir failed to set permissions on %s : %s\n",fullpath,strerror(errno)); - }; - }; - } - }; - *p = '/'; - p++; - } - return 0; + 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 (mkdir_defmode(fullpath) == 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 (mkdir_defmode(fullpath) < 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) { - int keep_trying = 4; - int keep_path_extfs = 0; - int failed; - - while (keep_trying) { - if (keep_path_extfs) { - failed = copy_file(src, dst, 0755); - if (!failed) { - do_unlink(src); - } - } else { - failed = robust_rename (src, dst); - } + if (robust_rename(src, dst, NULL, 0755) < 0 + && (errno != ENOENT || make_bak_dir(dst) < 0 + || robust_rename(src, dst, NULL, 0755) < 0)) + return -1; + return 0; +} - if (failed) { - if (verbose > 2) - rprintf (FERROR, "robust_move failed: %s(%d)\n", - strerror (errno), errno); - switch (errno) { - /* external filesystem */ - case EXDEV: - keep_path_extfs = 1; - keep_trying--; - break; - /* no directory to write to */ - case ENOENT: - make_dir (dst, 0755); - keep_trying--; - break; - default: - keep_trying = 0; - } /* switch */ - } else - keep_trying = 0; - } /* while */ - return (!failed); -} /* robust_move */ - - -/* 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 */ + +/* 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) { - - static int initialised; - - char keep_name [MAXPATHLEN]; STRUCT_STAT st; struct file_struct *file; - - int kept=0; + char *buf; + int kept = 0; int ret_code; - if (!initialised) { - if (backup_dir[strlen(backup_dir) - 1] == '/') - backup_dir[strlen(backup_dir) - 1] = 0; - if (verbose > 0) - rprintf (FINFO, "backup_dir is %s\n", backup_dir); - initialised = 1; - } - /* return if no file to keep */ -#if SUPPORT_LINKS - if (do_lstat (fname, &st)) return 1; -#else - if (do_stat (fname, &st)) return 1; -#endif - - file = make_file (-1, fname, 0); + if (do_lstat(fname, &st) < 0) + return 1; - /* make a complete pathname for backup file */ - if (strlen(backup_dir) + strlen(fname) > (MAXPATHLEN - 1)) { - rprintf (FERROR, "keep_backup filename too long\n"); - return 0; - } - - slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname); + if (!(file = make_file(fname, NULL, NULL, 0, NO_FILTERS))) + return 1; /* the file could have disappeared */ + if (!(buf = get_backup_name(fname))) + 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) { - make_bak_dir(fname,backup_dir); - if(do_mknod(keep_name,file->mode,file->rdev)!=0) { - rprintf(FERROR,"mknod %s : %s\n",keep_name,strerror(errno)); - } else { - if(verbose>2) - rprintf(FINFO,"make_backup : DEVICE %s successful.\n",fname); - }; - }; - kept=1; - do_unlink(fname); - }; -#endif + if ((am_root && preserve_devices && IS_DEVICE(file->mode)) + || (preserve_specials && IS_SPECIAL(file->mode))) { + do_unlink(buf); + if (do_mknod(buf, file->mode, file->u.rdev) < 0 + && (errno != ENOENT || make_bak_dir(buf) < 0 + || do_mknod(buf, file->mode, file->u.rdev) < 0)) { + rsyserr(FERROR, errno, "mknod %s failed", + full_fname(buf)); + } else if (verbose > 2) { + rprintf(FINFO, "make_backup: DEVICE %s successful.\n", + fname); + } + kept = 1; + do_unlink(fname); + } - if(!kept && S_ISDIR(file->mode)) { + if (!kept && S_ISDIR(file->mode)) { /* make an empty directory */ - make_bak_dir(fname,backup_dir); - do_mkdir(keep_name,file->mode); - ret_code=do_rmdir(fname); - if(verbose>2) - rprintf(FINFO,"make_backup : RMDIR %s returns %i\n",fname,ret_code); - kept=1; - }; - -#if SUPPORT_LINKS - if(!kept && preserve_links && S_ISLNK(file->mode)) { - extern int safe_symlinks; - if (safe_symlinks && unsafe_symlink(file->link, keep_name)) { - if (verbose) { - rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n", - keep_name,file->link); - } - kept=1; - } - make_bak_dir(fname,backup_dir); - if(do_symlink(file->link,keep_name) != 0) { - rprintf(FERROR,"link %s -> %s : %s\n",keep_name,file->link,strerror(errno)); - }; - do_unlink(fname); - kept=1; - }; + if (do_mkdir(buf, file->mode) < 0 + && (errno != ENOENT || make_bak_dir(buf) < 0 + || do_mkdir(buf, file->mode) < 0)) { + rsyserr(FINFO, errno, "mkdir %s failed", + full_fname(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; + } + +#ifdef SUPPORT_LINKS + if (!kept && preserve_links && S_ISLNK(file->mode)) { + if (safe_symlinks && unsafe_symlink(file->u.link, buf)) { + if (verbose) { + rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", + full_fname(buf), file->u.link); + } + kept = 1; + } else { + do_unlink(buf); + if (do_symlink(file->u.link, buf) < 0 + && (errno != ENOENT || make_bak_dir(buf) < 0 + || do_symlink(file->u.link, buf) < 0)) { + rsyserr(FERROR, errno, "link %s -> \"%s\"", + full_fname(buf), + file->u.link); + } + do_unlink(fname); + kept = 1; + } + } #endif - if(!kept && preserve_hard_links && check_hard_link(file)) { - if(verbose > 1) rprintf(FINFO,"%s is a hard link\n",f_name(file)); - }; - if(!kept && !S_ISREG(file->mode)) { - rprintf(FINFO,"make_bak: skipping non-regular file %s\n",fname); - } + if (!kept && !S_ISREG(file->mode)) { + rprintf(FINFO, "make_bak: skipping non-regular file %s\n", + fname); + return 1; + } /* move to keep tree if a file */ - if(!kept) { - if (!robust_move (fname, keep_name)) - rprintf(FERROR, "keep_backup failed %s -> %s : %s\n", - fname, keep_name, strerror(errno)); - }; - set_perms (keep_name, file, NULL, 0); - free_file (file); - free (file); - - if (verbose > 1) - rprintf (FINFO, "keep_backup %s -> %s\n", fname, keep_name); + if (!kept) { + if (robust_move(fname, buf) != 0) { + rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", + full_fname(fname), buf); + } else if (st.st_nlink > 1) { + /* If someone has hard-linked the file into the backup + * dir, rename() might return success but do nothing! */ + robust_unlink(fname); /* Just in case... */ + } + } + set_file_attrs(buf, file, NULL, 0); + free(file); + + if (verbose > 1) { + rprintf(FINFO, "backed up %s to %s\n", + fname, buf); + } return 1; -} /* keep_backup */ +} /* main backup switch routine */ int make_backup(char *fname) { if (backup_dir) - return (keep_backup(fname)); - else - return (make_simple_backup(fname)); + return keep_backup(fname); + return make_simple_backup(fname); } -