| 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; |
| 25 | extern char *backup_dir; |
| 26 | |
| 27 | |
| 28 | extern int am_root; |
| 29 | extern int preserve_devices; |
| 30 | extern int preserve_links; |
| 31 | extern int preserve_hard_links; |
| 32 | |
| 33 | /* simple backup creates a backup with a suffix in the same directory */ |
| 34 | static int make_simple_backup(char *fname) |
| 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 | |
| 42 | slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix); |
| 43 | if (do_rename(fname,fnamebak) != 0) { |
| 44 | /* cygwin (at least version b19) reports EINVAL */ |
| 45 | if (errno != ENOENT && errno != EINVAL) { |
| 46 | rsyserr(FERROR, errno, "rename %s to backup %s", fname, fnamebak); |
| 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 | } |
| 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 | |
| 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]!='/') { |
| 95 | slprintf(fullpath,sizeof(fullpath),"%s/",bak_path); |
| 96 | } else { |
| 97 | slprintf(fullpath,sizeof(fullpath),"%s",bak_path); |
| 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 | |
| 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) { |
| 137 | if (keep_path_extfs) { |
| 138 | failed = copy_file(src, dst, 0755); |
| 139 | if (!failed) { |
| 140 | do_unlink(src); |
| 141 | } |
| 142 | } else { |
| 143 | failed = robust_rename (src, dst); |
| 144 | } |
| 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 | { |
| 175 | |
| 176 | static int initialised; |
| 177 | |
| 178 | char keep_name [MAXPATHLEN]; |
| 179 | STRUCT_STAT st; |
| 180 | struct file_struct *file; |
| 181 | |
| 182 | int kept=0; |
| 183 | int ret_code; |
| 184 | |
| 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 | |
| 200 | file = make_file(-1, fname, NULL, 1); |
| 201 | |
| 202 | /* the file could have disappeared */ |
| 203 | if (!file) return 1; |
| 204 | |
| 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 | |
| 211 | slprintf(keep_name, sizeof (keep_name), "%s/%s", backup_dir, fname); |
| 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 | } |
| 266 | |
| 267 | /* move to keep tree if a file */ |
| 268 | if(!kept) { |
| 269 | if (!robust_move (fname, keep_name)) |
| 270 | rprintf(FERROR, "keep_backup failed %s -> %s : %s\n", |
| 271 | fname, keep_name, strerror(errno)); |
| 272 | }; |
| 273 | set_perms (keep_name, file, NULL, 0); |
| 274 | free_file (file); |
| 275 | free (file); |
| 276 | |
| 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 | |