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https://github.com/flatpak/flatpak.git
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65f5c98e11
Fixes #4268 Make sure that session-helper always tracks the destinations of symlinks. This fixes a race condition on systems where '/etc/resolv.conf' is a symlink.
138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
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* Copyright © 2019 Red Hat, Inc
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include "flatpak-utils-base-private.h"
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#include <stdlib.h>
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#include <string.h>
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#include <gio/gio.h>
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#include "libglnx.h"
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const char *
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flatpak_get_tzdir (void)
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{
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const gchar *tzdir;
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tzdir = getenv ("TZDIR");
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if (tzdir)
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return tzdir;
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return "/usr/share/zoneinfo";
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}
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char *
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flatpak_get_timezone (void)
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{
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g_autofree gchar *symlink = NULL;
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gchar *etc_timezone = NULL;
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symlink = flatpak_resolve_link ("/etc/localtime", NULL);
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if (symlink != NULL)
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{
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/* Resolve relative path */
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g_autofree gchar *canonical = flatpak_canonicalize_filename (symlink);
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char *canonical_suffix;
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const gchar *tzdir = flatpak_get_tzdir ();
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/* Strip the prefix and slashes if possible. */
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if (g_str_has_prefix (canonical, tzdir))
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{
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canonical_suffix = canonical + strlen (tzdir);
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while (*canonical_suffix == '/')
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canonical_suffix++;
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return g_strdup (canonical_suffix);
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}
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}
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if (g_file_get_contents ("/etc/timezone", &etc_timezone,
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NULL, NULL))
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{
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g_strchomp (etc_timezone);
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return etc_timezone;
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}
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/* Final fall-back is UTC */
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return g_strdup ("UTC");
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}
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char *
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flatpak_readlink (const char *path,
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GError **error)
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{
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return glnx_readlinkat_malloc (-1, path, NULL, error);
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}
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char *
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flatpak_resolve_link (const char *path,
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GError **error)
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{
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g_autofree char *link = flatpak_readlink (path, error);
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g_autofree char *dirname = NULL;
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if (link == NULL)
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return NULL;
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if (g_path_is_absolute (link))
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return g_steal_pointer (&link);
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dirname = g_path_get_dirname (path);
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return g_build_filename (dirname, link, NULL);
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}
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char *
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flatpak_realpath (const char *path,
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GError **error)
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{
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struct stat stbuf;
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if (!glnx_fstatat (AT_FDCWD, path, &stbuf, AT_SYMLINK_NOFOLLOW, error))
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return NULL;
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if (S_ISLNK (stbuf.st_mode))
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{
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g_autofree char *resolved = NULL;
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resolved = flatpak_resolve_link (path, error);
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if (!resolved)
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return NULL;
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return flatpak_canonicalize_filename (resolved);
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}
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return flatpak_canonicalize_filename (path);
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}
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/*
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* Syntactically canonicalize a filename, similar to
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* g_canonicalize_filename() in newer GLib.
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*
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* This function does not do I/O.
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*/
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char *
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flatpak_canonicalize_filename (const char *path)
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{
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g_autoptr(GFile) file = g_file_new_for_path (path);
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return g_file_get_path (file);
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}
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