lib/dpkg/db-ctrl-access.c

   1 /*
   2  * libdpkg - Debian packaging suite library routines
   3  * db-ctrl-access.c - package control information database
   4  *
   5  * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
   6  * Copyright © 2011-2014 Guillem Jover <guillem@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 #include <sys/stat.h>
  27
  28 #include <errno.h>
  29 #include <dirent.h>
  30 #include <unistd.h>
  31
  32 #include <dpkg/i18n.h>
  33 #include <dpkg/dpkg.h>
  34 #include <dpkg/dpkg-db.h>
  35 #include <dpkg/fsys.h>
  36 #include <dpkg/db-ctrl.h>
  37 #include <dpkg/debug.h>
  38
  39 bool
  40 pkg_infodb_has_file(struct pkginfo *pkg, struct pkgbin *pkgbin,
  41                     const char *name)
  42 {
  43         const char *filename;
  44         struct stat stab;
  45
  46         filename = pkg_infodb_get_file(pkg, pkgbin, name);
  47         if (lstat(filename, &stab) == 0)
  48                 return true;
  49         else if (errno == ENOENT)
  50                 return false;
  51         else
  52                 ohshite(_("unable to check existence of '%.250s'"), filename);
  53 }
  54
  55 void
  56 pkg_infodb_foreach(struct pkginfo *pkg, struct pkgbin *pkgbin,
  57                    pkg_infodb_file_func *func)
  58 {
  59         DIR *db_dir;
  60         struct dirent *db_de;
  61         struct varbuf_state db_path_state;
  62         struct varbuf db_path = VARBUF_INIT;
  63         const char *pkgname;
  64         enum pkg_infodb_format db_format;
  65
  66         /* Make sure to always read and verify the format version. */
  67         db_format = pkg_infodb_get_format();
  68
  69         if (pkgbin->multiarch == PKG_MULTIARCH_SAME &&
  70             db_format == PKG_INFODB_FORMAT_MULTIARCH)
  71                 pkgname = pkgbin_name(pkg, pkgbin, pnaw_always);
  72         else
  73                 pkgname = pkgbin_name(pkg, pkgbin, pnaw_never);
  74
  75         varbuf_add_str(&db_path, pkg_infodb_get_dir());
  76         varbuf_add_char(&db_path, '/');
  77         varbuf_end_str(&db_path);
  78         varbuf_snapshot(&db_path, &db_path_state);
  79
  80         db_dir = opendir(db_path.buf);
  81         if (!db_dir)
  82                 ohshite(_("cannot read info directory"));
  83
  84         push_cleanup(cu_closedir, ~0, 1, (void *)db_dir);
  85         while ((db_de = readdir(db_dir)) != NULL) {
  86                 const char *filename, *filetype, *dot;
  87
  88                 debug(dbg_veryverbose, "infodb foreach info file '%s'",
  89                       db_de->d_name);
  90
  91                 /* Ignore dotfiles, including ‘.’ and ‘..’. */
  92                 if (db_de->d_name[0] == '.')
  93                         continue;
  94
  95                 /* Ignore anything odd. */
  96                 dot = strrchr(db_de->d_name, '.');
  97                 if (dot == NULL)
  98                         continue;
  99
 100                 /* Ignore files from other packages. */
 101                 if (strlen(pkgname) != (size_t)(dot - db_de->d_name) ||
 102                     strncmp(db_de->d_name, pkgname, dot - db_de->d_name))
 103                         continue;
 104
 105                 debug(dbg_stupidlyverbose, "infodb foreach file this pkg");
 106
 107                 /* Skip past the full stop. */
 108                 filetype = dot + 1;
 109
 110                 varbuf_rollback(&db_path, &db_path_state);
 111                 varbuf_add_str(&db_path, db_de->d_name);
 112                 varbuf_end_str(&db_path);
 113                 filename = db_path.buf;
 114
 115                 func(filename, filetype);
 116         }
 117         pop_cleanup(ehflag_normaltidy); /* closedir */
 118
 119         varbuf_destroy(&db_path);
 120 }