rsync.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 /* this file contains code used by more than one part of the rsync
  21    process */
  22
  23 #include "rsync.h"
  24
  25 extern int verbose;
  26 extern int dry_run;
  27 extern int preserve_times;
  28 extern int am_root;
  29 extern int preserve_uid;
  30 extern int preserve_gid;
  31 extern int preserve_perms;
  32 extern int make_backups;
  33
  34
  35 /*
  36   free a sums struct
  37   */
  38 void free_sums(struct sum_struct *s)
  39 {
  40         if (s->sums) free(s->sums);
  41         free(s);
  42 }
  43
  44
  45 /*
  46  * delete a file or directory. If force_delete is set then delete
  47  * recursively
  48  */
  49 int delete_file(char *fname)
  50 {
  51         DIR *d;
  52         struct dirent *di;
  53         char buf[MAXPATHLEN];
  54         extern int force_delete;
  55         STRUCT_STAT st;
  56         int ret;
  57         extern int recurse;
  58
  59 #if SUPPORT_LINKS
  60         ret = do_lstat(fname, &st);
  61 #else
  62         ret = do_stat(fname, &st);
  63 #endif
  64         if (ret) {
  65                 return -1;
  66         }
  67
  68         if (!S_ISDIR(st.st_mode)) {
  69                 if (robust_unlink(fname) == 0 || errno == ENOENT) return 0;
  70                 rprintf(FERROR, "delete_file: unlink %s failed: %s\n",
  71                         full_fname(fname), strerror(errno));
  72                 return -1;
  73         }
  74
  75         if (do_rmdir(fname) == 0 || errno == ENOENT) return 0;
  76         if (!force_delete || !recurse ||
  77             (errno != ENOTEMPTY && errno != EEXIST)) {
  78                 rprintf(FERROR, "delete_file: rmdir %s failed: %s\n",
  79                         full_fname(fname), strerror(errno));
  80                 return -1;
  81         }
  82
  83         /* now we do a recsursive delete on the directory ... */
  84         d = opendir(fname);
  85         if (!d) {
  86                 rprintf(FERROR, "delete_file: opendir %s failed: %s\n",
  87                         full_fname(fname), strerror(errno));
  88                 return -1;
  89         }
  90
  91         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
  92                 char *dname = d_name(di);
  93                 if (strcmp(dname,".") == 0
  94                     || strcmp(dname,"..") == 0)
  95                         continue;
  96                 snprintf(buf, sizeof(buf), "%s/%s", fname, dname);
  97                 if (verbose > 0)
  98                         rprintf(FINFO,"deleting %s\n", buf);
  99                 if (delete_file(buf) != 0) {
 100                         closedir(d);
 101                         return -1;
 102                 }
 103         }
 104         if (errno) {
 105                 rprintf(FERROR, "delete_file: readdir %s failed: %s\n",
 106                         full_fname(fname), strerror(errno));
 107                 closedir(d);
 108                 return -1;
 109         }
 110
 111         closedir(d);
 112
 113         if (do_rmdir(fname) != 0) {
 114                 rprintf(FERROR, "delete_file: rmdir %s failed: %s\n",
 115                         full_fname(fname), strerror(errno));
 116                 return -1;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int is_in_group(gid_t gid)
 123 {
 124 #ifdef GETGROUPS_T
 125         static gid_t last_in = (gid_t) -2, last_out;
 126         static int ngroups = -2;
 127         static GETGROUPS_T *gidset;
 128         int n;
 129
 130         if (gid == last_in)
 131                 return last_out;
 132         if (ngroups < -1) {
 133                 /* treat failure (-1) as if not member of any group */
 134                 ngroups = getgroups(0, 0);
 135                 if (ngroups > 0) {
 136                         gidset = new_array(GETGROUPS_T, ngroups);
 137                         ngroups = getgroups(ngroups, gidset);
 138                 }
 139         }
 140
 141         last_in = gid;
 142         last_out = 0;
 143         for (n = 0; n < ngroups; n++) {
 144                 if (gidset[n] == gid) {
 145                         last_out = 1;
 146                         break;
 147                 }
 148         }
 149         return last_out;
 150
 151 #else
 152         return 0;
 153 #endif
 154 }
 155
 156 int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
 157                 int report)
 158 {
 159         int updated = 0;
 160         STRUCT_STAT st2;
 161         int change_uid, change_gid;
 162
 163         if (dry_run) return 0;
 164
 165         if (!st) {
 166                 if (link_stat(fname,&st2) != 0) {
 167                         rprintf(FERROR, "stat %s failed: %s\n",
 168                                 full_fname(fname), strerror(errno));
 169                         return 0;
 170                 }
 171                 st = &st2;
 172         }
 173
 174         if (preserve_times && !S_ISLNK(st->st_mode) &&
 175             cmp_modtime(st->st_mtime, file->modtime) != 0) {
 176                 /* don't complain about not setting times on directories
 177                    because some filesystems can't do it */
 178                 if (set_modtime(fname,file->modtime) != 0 &&
 179                     !S_ISDIR(st->st_mode)) {
 180                         rprintf(FERROR, "failed to set times on %s: %s\n",
 181                                 full_fname(fname), strerror(errno));
 182                         return 0;
 183                 } else {
 184                         updated = 1;
 185                 }
 186         }
 187
 188         change_uid = am_root && preserve_uid && st->st_uid != file->uid;
 189         change_gid = preserve_gid && file->gid != (gid_t) -1 && \
 190                                 st->st_gid != file->gid;
 191         if (change_gid && !am_root) {
 192                 /* enforce bsd-style group semantics: non-root can only
 193                     change to groups that the user is a member of */
 194                 change_gid = is_in_group(file->gid);
 195         }
 196         if (change_uid || change_gid) {
 197                 if (do_lchown(fname,
 198                               change_uid?file->uid:st->st_uid,
 199                               change_gid?file->gid:st->st_gid) != 0) {
 200                         /* shouldn't have attempted to change uid or gid
 201                              unless have the privilege */
 202                         rprintf(FERROR, "chown %s failed: %s\n",
 203                                 full_fname(fname), strerror(errno));
 204                         return 0;
 205                 }
 206                 /* a lchown had been done - we have to re-stat if the
 207                    destination had the setuid or setgid bits set due
 208                    to the side effect of the chown call */
 209                 if (st->st_mode & (S_ISUID | S_ISGID)) {
 210                         link_stat(fname, st);
 211                 }
 212                 updated = 1;
 213         }
 214
 215 #ifdef HAVE_CHMOD
 216         if (!S_ISLNK(st->st_mode)) {
 217                 if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) {
 218                         updated = 1;
 219                         if (do_chmod(fname,(file->mode & CHMOD_BITS)) != 0) {
 220                                 rprintf(FERROR, "failed to set permissions on %s: %s\n",
 221                                         full_fname(fname), strerror(errno));
 222                                 return 0;
 223                         }
 224                 }
 225         }
 226 #endif
 227
 228         if (verbose > 1 && report) {
 229                 if (updated)
 230                         rprintf(FINFO,"%s\n",fname);
 231                 else
 232                         rprintf(FINFO,"%s is uptodate\n",fname);
 233         }
 234         return updated;
 235 }
 236
 237
 238 void sig_int(void)
 239 {
 240         exit_cleanup(RERR_SIGNAL);
 241 }
 242
 243
 244 /* finish off a file transfer, renaming the file and setting the permissions
 245    and ownership */
 246 void finish_transfer(char *fname, char *fnametmp, struct file_struct *file)
 247 {
 248         if (make_backups && !make_backup(fname))
 249                 return;
 250
 251         /* move tmp file over real file */
 252         if (robust_rename(fnametmp,fname) != 0) {
 253                 if (errno == EXDEV) {
 254                         /* rename failed on cross-filesystem link.
 255                            Copy the file instead. */
 256                         if (copy_file(fnametmp,fname, file->mode & INITACCESSPERMS)) {
 257                                 rprintf(FERROR, "copy %s -> \"%s\": %s\n",
 258                                         full_fname(fnametmp), fname,
 259                                         strerror(errno));
 260                         } else {
 261                                 set_perms(fname,file,NULL,0);
 262                         }
 263                 } else {
 264                         rprintf(FERROR,"rename %s -> \"%s\": %s\n",
 265                                 full_fname(fnametmp), fname, strerror(errno));
 266                 }
 267                 do_unlink(fnametmp);
 268         } else {
 269                 set_perms(fname,file,NULL,0);
 270         }
 271 }