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/*
* libdpkg - Debian packaging suite library routines
* fsys-dir.c - filesystem root directory functions
*
* Copyright © 2011, 2018 Guillem Jover <guillem@debian.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <stdlib.h>
#include <dpkg/dpkg.h>
#include <dpkg/string.h>
#include <dpkg/path.h>
#include <dpkg/fsys.h>
static char *fsys_dir;
/**
* Allocate the default on-disk filesystem root directory.
*
* The directory defaults to the value from environment variable
* DPKG_ROOT, and if not set the built-in default "".
*
* @return The filesystem root directory.
*/
static char *
dpkg_fsys_new_dir(void)
{
const char *env;
char *dir;
env = getenv("DPKG_ROOT");
if (env == NULL) {
dir = m_strdup("");
} else {
dir = m_strdup(env);
path_trim_slash_slashdot(dir);
}
return dir;
}
/**
* Set current on-disk filesystem root directory.
*
* This function can be used to set the directory to a new value, or to
* reset it to a default value if dir is NULL.
*
* @param dir The new filesystem root directory, or NULL to set to default.
*
* @return The new filesystem root directory.
*/
const char *
dpkg_fsys_set_dir(const char *dir)
{
char *dir_new;
if (dir == NULL) {
dir_new = dpkg_fsys_new_dir();
} else {
dir_new = m_strdup(dir);
path_trim_slash_slashdot(dir_new);
}
free(fsys_dir);
fsys_dir = dir_new;
return fsys_dir;
}
/**
* Get current on-disk filesystem root directory.
*
* This function will take care of initializing the directory if it has not
* been initialized before.
*
* @return The current filesystem root directory.
*/
const char *
dpkg_fsys_get_dir(void)
{
if (fsys_dir == NULL)
fsys_dir = dpkg_fsys_new_dir();
return fsys_dir;
}
/**
* Get a pathname to the current on-disk filesystem root directory.
*
* This function returns an allocated string, which should be freed with
* free(2).
*
* @param pathpart The pathpart to append to the new pathname.
*
* @return The newly allocated pathname.
*/
char *
dpkg_fsys_get_path(const char *pathpart)
{
pathpart = path_skip_slash_dotslash(pathpart);
return str_fmt("%s/%s", dpkg_fsys_get_dir(), pathpart);
}
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