lib/dpkg/dbdir.c

   1 /*
   2  * libdpkg - Debian packaging suite library routines
   3  * dbdir.c - on-disk database directory functions
   4  *
   5  * Copyright © 2011 Guillem Jover <guillem@debian.org>
   6  *
   7  * This is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <compat.h>
  23
  24 #include <sys/types.h>
  25
  26 #include <stdlib.h>
  27
  28 #include <dpkg/dpkg.h>
  29 #include <dpkg/dpkg-db.h>
  30 #include <dpkg/fsys.h>
  31
  32 static const char *db_dir = ADMINDIR;
  33
  34 /**
  35  * Set current on-disk database directory.
  36  *
  37  * The directory is initially set to ADMINDIR, this function can be used to
  38  * set the directory to a new value, or to set it to a default value if dir
  39  * is NULL. For the latter the order is, value from environment variable
  40  * DPKG_ADMINDIR, and then the built-in default ADMINDIR,
  41  *
  42  * @param dir The new database directory, or NULL to set to default.
  43  *
  44  * @return The new database directory.
  45  */
  46 const char *
  47 dpkg_db_set_dir(const char *dir)
  48 {
  49         if (dir == NULL) {
  50                 const char *env;
  51
  52                 env = getenv("DPKG_ADMINDIR");
  53                 if (env)
  54                         db_dir = env;
  55                 else
  56                         db_dir = dpkg_fsys_get_path(ADMINDIR);
  57         } else {
  58                 db_dir = dir;
  59         }
  60
  61         return db_dir;
  62 }
  63
  64 /**
  65  * Get current on-disk database directory.
  66  *
  67  * @return The current database directory.
  68  */
  69 const char *
  70 dpkg_db_get_dir(void)
  71 {
  72         return db_dir;
  73 }
  74
  75 /**
  76  * Get a pathname to the current on-disk database directory.
  77  *
  78  * This function returns an allocated string, which should be freed with
  79  * free(2).
  80  *
  81  * @param pathpart The pathpart to append to the new pathname.
  82  *
  83  * @return The newly allocated pathname.
  84  */
  85 char *
  86 dpkg_db_get_path(const char *pathpart)
  87 {
  88         return str_fmt("%s/%s", db_dir, pathpart);
  89 }