| /* |
| 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 suffix_specified; |
| 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; |
| |
| /* simple backup creates a backup with a suffix in the same directory */ |
| static int make_simple_backup(char *fname) |
| { |
| char fnamebak[MAXPATHLEN]; |
| if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) { |
| rprintf(FERROR,"backup filename too long\n"); |
| return 0; |
| } |
| |
| snprintf(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) { |
| 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; |
| } |
| |
| |
| /* recursively make a directory path */ |
| static int make_dir(char *name, int mask) |
| { |
| 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) |
| 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; |
| |
| 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) |
| { |
| 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]!='/') { |
| snprintf(fullpath,sizeof(fullpath),"%s/",bak_path); |
| } else { |
| snprintf(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; |
| } |
| |
| /* 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 (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 */ |
| static int keep_backup(char *fname) |
| { |
| |
| static int initialised; |
| |
| char keep_name [MAXPATHLEN]; |
| STRUCT_STAT st; |
| struct file_struct *file; |
| |
| 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(fname, NULL, NO_EXCLUDES); |
| |
| /* the file could have disappeared */ |
| if (!file) return 1; |
| |
| /* make a complete pathname for backup file */ |
| if (strlen(backup_dir) + strlen(fname) + |
| (suffix_specified ? strlen(backup_suffix) : 0) > (MAXPATHLEN - 1)) { |
| rprintf (FERROR, "keep_backup filename too long\n"); |
| return 0; |
| } |
| |
| if (suffix_specified) { |
| snprintf(keep_name, sizeof (keep_name), "%s/%s%s", backup_dir, fname, backup_suffix); |
| } else { |
| snprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname); |
| } |
| |
| |
| #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(!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; |
| }; |
| #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); |
| } |
| |
| /* 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); |
| 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)); |
| } |