lib/dpkg/db-fsys-divert.c

   1 /*
   2  * libdpkg - Debian packaging suite library routines
   3  * db-fsys-divert.c - management of filesystem diverted files database
   4  *
   5  * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
   6  * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@debian.org>
   7  *
   8  * This is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <config.h>
  23 #include <compat.h>
  24
  25 #include <sys/types.h>
  26
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <pwd.h>
  30 #include <grp.h>
  31 #include <fcntl.h>
  32 #include <unistd.h>
  33 #include <stdlib.h>
  34
  35 #include <dpkg/i18n.h>
  36 #include <dpkg/dpkg.h>
  37 #include <dpkg/dpkg-db.h>
  38 #include <dpkg/debug.h>
  39 #include <dpkg/db-fsys.h>
  40
  41 static struct fsys_diversion *diversions = NULL;
  42
  43 void
  44 ensure_diversions(void)
  45 {
  46         static struct dpkg_db db = {
  47                 .name = DIVERSIONSFILE,
  48         };
  49         enum dpkg_db_error rc;
  50         char linebuf[MAXDIVERTFILENAME];
  51         struct fsys_diversion *ov, *oicontest, *oialtname;
  52
  53         rc = dpkg_db_reopen(&db);
  54         if (rc == DPKG_DB_SAME)
  55                 return;
  56
  57         for (ov = diversions; ov; ov = ov->next) {
  58                 ov->useinstead->divert->camefrom->divert = NULL;
  59                 ov->useinstead->divert = NULL;
  60         }
  61         diversions = NULL;
  62
  63         if (rc == DPKG_DB_NONE)
  64                 return;
  65
  66         onerr_abort++;
  67
  68         while (fgets_checked(linebuf, sizeof(linebuf), db.file, db.pathname) >= 0) {
  69                 oicontest = nfmalloc(sizeof(*oicontest));
  70                 oialtname = nfmalloc(sizeof(*oialtname));
  71
  72                 oialtname->camefrom = fsys_hash_find_node(linebuf, FHFF_NONE);
  73                 oialtname->useinstead = NULL;
  74
  75                 fgets_must(linebuf, sizeof(linebuf), db.file, db.pathname);
  76                 oicontest->useinstead = fsys_hash_find_node(linebuf, FHFF_NONE);
  77                 oicontest->camefrom = NULL;
  78
  79                 fgets_must(linebuf, sizeof(linebuf), db.file, db.pathname);
  80                 oicontest->pkgset = strcmp(linebuf, ":") ?
  81                                     pkg_hash_find_set(linebuf) : NULL;
  82                 oialtname->pkgset = oicontest->pkgset;
  83
  84                 if (oialtname->camefrom->divert ||
  85                     oicontest->useinstead->divert)
  86                         ohshit(_("conflicting diversions involving '%.250s' or '%.250s'"),
  87                                oialtname->camefrom->name, oicontest->useinstead->name);
  88
  89                 oialtname->camefrom->divert = oicontest;
  90                 oicontest->useinstead->divert = oialtname;
  91
  92                 oicontest->next = diversions;
  93                 diversions = oicontest;
  94         }
  95
  96         onerr_abort--;
  97 }