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/* plugin-flatpak-aux.c
*
* Copyright 2021-2025 Christian Hergert <chergert@redhat.com>
*
* This library 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 General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include "foundry-util-private.h"
#include "plugin-flatpak-aux.h"
#define SYSTEM_FONTS_DIR "/usr/share/fonts"
#define SYSTEM_LOCAL_FONTS_DIR "/usr/local/share/fonts"
/* dirs are reversed from flatpak because we will always have
* /var/cache/fontconfig inside of flatpak. We really need another
* way of checking this, but this is good enough for now.
*/
#define SYSTEM_FONT_CACHE_DIRS "/var/cache/fontconfig:/usr/lib/fontconfig/cache"
/* The goal of this file is to help us setup things that might be
* needed for applications to look/work right even though they are
* not installed. For example, we need to setup font remaps for
* applications since "flatpak build" will not do that for us.
*/
static GFile *local;
static GFile *mapped;
static GPtrArray *maps;
static gboolean initialized;
static gboolean
query_exists_on_host (const char *path)
{
g_autofree char *alternate = NULL;
if (!_foundry_in_container ())
return g_file_test (path, G_FILE_TEST_EXISTS);
alternate = g_build_filename ("/var/run/host", path, NULL);
return g_file_test (alternate, G_FILE_TEST_EXISTS);
}
void
plugin_flatpak_aux_init (void)
{
g_autoptr(GString) xml_snippet = g_string_new ("");
g_auto(GStrv) system_cache_dirs = NULL;
g_autofree char *user1 = NULL;
g_autofree char *user2 = NULL;
g_autofree char *user_cache = NULL;
g_autofree char *cache_dir = NULL;
g_autofree char *data_dir = NULL;
guint i;
if (initialized)
return;
initialized = TRUE;
/* It would be nice if we had a way to get XDG dirs from the host
* system when we need to break out of flatpak to run flatpak bits
* through the system.
*/
if (_foundry_in_container ())
{
cache_dir = g_build_filename (g_get_home_dir (), ".cache", NULL);
data_dir = g_build_filename (g_get_home_dir (), ".local", "share", NULL);
}
else
{
cache_dir = g_strdup (g_get_user_cache_dir ());
data_dir = g_strdup (g_get_user_data_dir ());
}
local = g_file_new_for_path ("/run/host/font-dirs.xml");
mapped = g_file_new_build_filename (cache_dir, "font-dirs.xml", NULL);
maps = g_ptr_array_new ();
g_string_append (xml_snippet,
"<?xml version=\"1.0\"?>\n"
"<!DOCTYPE fontconfig SYSTEM \"urn:fontconfig:fonts.dtd\">\n"
"<fontconfig>\n");
if (query_exists_on_host (SYSTEM_FONTS_DIR))
{
/* TODO: How can we *force* this read-only? */
g_ptr_array_add (maps, g_strdup ("--bind-mount=/run/host/fonts=" SYSTEM_FONTS_DIR));
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/fonts</remap-dir>\n",
SYSTEM_FONTS_DIR);
}
if (query_exists_on_host (SYSTEM_LOCAL_FONTS_DIR))
{
/* TODO: How can we *force* this read-only? */
g_ptr_array_add (maps, g_strdup ("--bind-mount=/run/host/local-fonts=/usr/local/share/fonts"));
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/local-fonts</remap-dir>\n",
"/usr/local/share/fonts");
}
system_cache_dirs = g_strsplit (SYSTEM_FONT_CACHE_DIRS, ":", 0);
for (i = 0; system_cache_dirs[i] != NULL; i++)
{
if (query_exists_on_host (system_cache_dirs[i]))
{
/* TODO: How can we *force* this read-only? */
g_ptr_array_add (maps,
g_strdup_printf ("--bind-mount=/run/host/fonts-cache=%s",
system_cache_dirs[i]));
break;
}
}
user1 = g_build_filename (data_dir, "fonts", NULL);
user2 = g_build_filename (g_get_home_dir (), ".fonts", NULL);
user_cache = g_build_filename (cache_dir, "fontconfig", NULL);
if (query_exists_on_host (user1))
{
g_ptr_array_add (maps, g_strdup_printf ("--filesystem=%s:ro", user1));
g_ptr_array_add (maps, g_strdup_printf ("--bind-mount=/run/host/user-fonts=%s", user1));
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/user-fonts</remap-dir>\n",
user1);
}
else if (query_exists_on_host (user2))
{
g_ptr_array_add (maps, g_strdup_printf ("--filesystem=%s:ro", user2));
g_ptr_array_add (maps, g_strdup_printf ("--bind-mount=/run/host/user-fonts=%s", user2));
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/user-fonts</remap-dir>\n",
user2);
}
if (query_exists_on_host (user_cache))
{
g_ptr_array_add (maps, g_strdup_printf ("--filesystem=%s:ro", user_cache));
g_ptr_array_add (maps, g_strdup_printf ("--bind-mount=/run/host/user-fonts-cache=%s", user_cache));
}
g_string_append (xml_snippet, "</fontconfig>\n");
g_file_replace_contents (mapped, xml_snippet->str, xml_snippet->len,
NULL, FALSE, G_FILE_CREATE_REPLACE_DESTINATION,
NULL, NULL, NULL);
g_ptr_array_add (maps,
g_strdup_printf ("--bind-mount=/run/host/font-dirs.xml=%s",
g_file_peek_path (mapped)));
}
void
plugin_flatpak_aux_append_to_launcher (FoundryProcessLauncher *launcher)
{
gboolean in_container;
g_return_if_fail (FOUNDRY_IS_PROCESS_LAUNCHER (launcher));
g_return_if_fail (initialized);
for (guint i = 0; i < maps->len; i++)
{
const char *element = g_ptr_array_index (maps, i);
foundry_process_launcher_append_argv (launcher, element);
}
in_container = _foundry_in_container ();
if ((in_container && g_file_test ("/var/run/host/usr/share/icons", G_FILE_TEST_EXISTS)) ||
(!in_container && g_file_test ("/usr/share/icons", G_FILE_TEST_EXISTS)))
foundry_process_launcher_append_argv (launcher, "--bind-mount=/run/host/share/icons=/usr/share/icons");
}
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