chiark - git - mdw - dpkg/blob - src/infodb-access.c

   1 /*
   2  * dpkg - main program for package management
   3  * infodb.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/debug.h>
  36
  37 #include "filesdb.h"
  38 #include "infodb.h"
  39
  40 bool
  41 pkg_infodb_has_file(struct pkginfo *pkg, struct pkgbin *pkgbin,
  42                     const char *name)
  43 {
  44         const char *filename;
  45         struct stat stab;
  46
  47         filename = pkg_infodb_get_file(pkg, pkgbin, name);
  48         if (lstat(filename, &stab) == 0)
  49                 return true;
  50         else if (errno == ENOENT)
  51                 return false;
  52         else
  53                 ohshite(_("unable to check existence of '%.250s'"), filename);
  54 }
  55
  56 void
  57 pkg_infodb_foreach(struct pkginfo *pkg, struct pkgbin *pkgbin,
  58                    pkg_infodb_file_func *func)
  59 {
  60         DIR *db_dir;
  61         struct dirent *db_de;
  62         struct varbuf_state db_path_state;
  63         struct varbuf db_path = VARBUF_INIT;
  64         const char *pkgname;
  65         enum pkg_infodb_format db_format;
  66
  67         /* Make sure to always read and verify the format version. */
  68         db_format = pkg_infodb_get_format();
  69
  70         if (pkgbin->multiarch == PKG_MULTIARCH_SAME &&
  71             db_format == PKG_INFODB_FORMAT_MULTIARCH)
  72                 pkgname = pkgbin_name(pkg, pkgbin, pnaw_always);
  73         else
  74                 pkgname = pkgbin_name(pkg, pkgbin, pnaw_never);
  75
  76         varbuf_add_str(&db_path, pkg_infodb_get_dir());
  77         varbuf_add_char(&db_path, '/');
  78         varbuf_end_str(&db_path);
  79         varbuf_snapshot(&db_path, &db_path_state);
  80
  81         db_dir = opendir(db_path.buf);
  82         if (!db_dir)
  83                 ohshite(_("cannot read info directory"));
  84
  85         push_cleanup(cu_closedir, ~0, NULL, 0, 1, (void *)db_dir);
  86         while ((db_de = readdir(db_dir)) != NULL) {
  87                 const char *filename, *filetype, *dot;
  88
  89                 debug(dbg_veryverbose, "infodb foreach info file '%s'",
  90                       db_de->d_name);
  91
  92                 /* Ignore dotfiles, including ‘.’ and ‘..’. */
  93                 if (db_de->d_name[0] == '.')
  94                         continue;
  95
  96                 /* Ignore anything odd. */
  97                 dot = strrchr(db_de->d_name, '.');
  98                 if (dot == NULL)
  99                         continue;
 100
 101                 /* Ignore files from other packages. */
 102                 if (strlen(pkgname) != (size_t)(dot - db_de->d_name) ||
 103                     strncmp(db_de->d_name, pkgname, dot - db_de->d_name))
 104                         continue;
 105
 106                 debug(dbg_stupidlyverbose, "infodb foreach file this pkg");
 107
 108                 /* Skip past the full stop. */
 109                 filetype = dot + 1;
 110
 111                 varbuf_rollback(&db_path, &db_path_state);
 112                 varbuf_add_str(&db_path, db_de->d_name);
 113                 varbuf_end_str(&db_path);
 114                 filename = db_path.buf;
 115
 116                 func(filename, filetype);
 117         }
 118         pop_cleanup(ehflag_normaltidy); /* closedir */
 119
 120         varbuf_destroy(&db_path);
 121 }