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/*
* Copyright © 2019 Red Hat, Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include "flatpak-utils-base-private.h"
#include <stdlib.h>
#include <string.h>
#include <gio/gio.h>
#include "libglnx/libglnx.h"
char *
flatpak_get_timezone (void)
{
g_autofree gchar *symlink = NULL;
gchar *etc_timezone = NULL;
const gchar *tzdir;
tzdir = getenv ("TZDIR");
if (tzdir == NULL)
tzdir = "/usr/share/zoneinfo";
symlink = flatpak_resolve_link ("/etc/localtime", NULL);
if (symlink != NULL)
{
/* Resolve relative path */
g_autofree gchar *canonical = flatpak_canonicalize_filename (symlink);
char *canonical_suffix;
/* Strip the prefix and slashes if possible. */
if (g_str_has_prefix (canonical, tzdir))
{
canonical_suffix = canonical + strlen (tzdir);
while (*canonical_suffix == '/')
canonical_suffix++;
return g_strdup (canonical_suffix);
}
}
if (g_file_get_contents ("/etc/timezeone", &etc_timezone,
NULL, NULL))
{
g_strchomp (etc_timezone);
return etc_timezone;
}
/* Final fall-back is UTC */
return g_strdup ("UTC");
}
char *
flatpak_readlink (const char *path,
GError **error)
{
return glnx_readlinkat_malloc (-1, path, NULL, error);
}
char *
flatpak_resolve_link (const char *path,
GError **error)
{
g_autofree char *link = flatpak_readlink (path, error);
g_autofree char *dirname = NULL;
if (link == NULL)
return NULL;
if (g_path_is_absolute (link))
return g_steal_pointer (&link);
dirname = g_path_get_dirname (path);
return g_build_filename (dirname, link, NULL);
}
char *
flatpak_canonicalize_filename (const char *path)
{
g_autoptr(GFile) file = g_file_new_for_path (path);
return g_file_get_path (file);
}
/* There is a dead-lock in glib versions before 2.60 when it closes
* the fds. See: https://gitlab.gnome.org/GNOME/glib/merge_requests/490
* This was hitting the test-suite a lot, so we work around it by using
* the G_SPAWN_LEAVE_DESCRIPTORS_OPEN/G_SUBPROCESS_FLAGS_INHERIT_FDS flag
* and setting CLOEXEC ourselves.
*/
void
flatpak_close_fds_workaround (int start_fd)
{
int max_open_fds = sysconf (_SC_OPEN_MAX);
int fd;
for (fd = start_fd; fd < max_open_fds; fd++)
fcntl (fd, F_SETFD, FD_CLOEXEC);
}
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