Add ability to set custom fusermount path

This is only exposed in Meson as Autotools isn't recommended.

This also removes the 'fuse' option as it seems redundant.

configure.ac

@@ -230,6 +230,8 @@ GLIB_TESTS
 FLATPAK_BUILDER_VERSION=flatpak_builder_version
 AC_SUBST(FLATPAK_BUILDER_VERSION)
 
+AC_DEFINE([FUSERMOUNT], ["fusermount"], [Path to fusermount binary])
+
 AC_CONFIG_FILES([
 Makefile
 data/Makefile

meson.build

@@ -2,7 +2,7 @@ project(
   'flatpak-builder',
   'c',
   license: 'LGPL-2.1-or-later',
-  meson_version: '>= 0.56.2',
+  meson_version: '>= 0.62.0',
   version: '1.4.4',
   default_options: 'c_std=gnu99',
 )
@@ -44,6 +44,13 @@ debugedit = find_program('debugedit', version: '>= 5.0')
 appstreamcli = find_program('appstreamcli', version: '>= 0.15.0')
 appstreamcli_compose = run_command(appstreamcli, ['compose', '--help'], check: true)
 
+fusermount = get_option('system_fusermount')
+if fusermount == ''
+  fusermount_program = find_program(['fusermount3', 'fusermount'], required: true)
+else
+  fusermount_program = find_program(fusermount, required: true)
+endif
+
 subdir('src')
 subdir('doc')
 if get_option('tests')

meson_options.txt

@@ -23,9 +23,8 @@ option(
   description: 'Whether to build and run unit tests'
 )
 option(
-  'fuse',
-  type: 'combo',
-  choices: ['2', '3', 'compatible'],
-  value: 'compatible',
-  description: 'Target a specific version of FUSE for best performance or support multiple versions'
-)
+  'system_fusermount',
+  type: 'string',
+  description: 'system fusermount executable, or empty string to try multiple names (fusermount3, fusermount) automatically',
+  value: '',
+)

src/builder-context.c

@@ -839,8 +839,7 @@ static char *rofiles_unmount_path = NULL;
 static void
 rofiles_umount_handler (int signum)
 {
-  char *argv[] = { "fusermount", "-uz", NULL,
-                     NULL };
+  char *argv[] = { FUSERMOUNT, "-uz", NULL, NULL };
 
   argv[2] = rofiles_unmount_path;
   g_debug ("Unmounting read-only fs: %s %s %s", argv[0], argv[1], argv[2]);
@@ -979,8 +978,7 @@ gboolean
 builder_context_disable_rofiles (BuilderContext *self,
                                  GError        **error)
 {
-  char *argv[] = { "fusermount", "-u", NULL,
-                     NULL };
+  char *argv[] = { FUSERMOUNT, "-u", NULL, NULL };
 
   if (!self->use_rofiles)
     return TRUE;

src/meson.build

@@ -39,7 +39,8 @@ config_data.set('GLIB_VERSION_MIN_REQUIRED', 'GLIB_VERSION_2_66')
 # We support targeting specific fuse versions to optimize performance.
 # Currently only fuse2 has optimizations but this allows for future fuse3
 # optimizations.
-config_data.set('ASSUME_FUSE_2', get_option('fuse') == '2')
+config_data.set('ASSUME_FUSE_2', fusermount_program.version().version_compare('< 3.0.0'))
+config_data.set_quoted('FUSERMOUNT', fusermount_program.full_path())
 
 config_h = configure_file(
   configuration: config_data,

tests/libtest.sh

@@ -30,6 +30,10 @@ else
   test_builddir=$(dirname $0)
 fi
 
+if [ -z "${FUSERMOUNT}" ]; then
+  FUSERMOUNT=fusermount
+fi
+
 assert_not_reached () {
     echo $@ 1>&2; exit 1
 }
@@ -296,7 +300,7 @@ run_sh () {
 # fuse support is needed (and the kernel module needs to be loaded) for several
 # flatpak-builder tests
 skip_without_fuse () {
-    if [ ! -w /dev/fuse ] || ! command -v fusermount >/dev/null; then
+    if [ ! -w /dev/fuse ] || ! command -v "$FUSERMOUNT" >/dev/null; then
         echo "1..0 # SKIP this test requires fuse support"
         exit 0
     fi

tests/meson.build

@@ -6,6 +6,7 @@ test_env.set('FLATPAK_TESTS_DEBUG', '1')
 test_env.set('G_TEST_SRCDIR', meson.current_source_dir())
 test_env.set('G_TEST_BUILDDIR', meson.current_build_dir())
 test_env.prepend('PATH', meson.current_build_dir() / '..' / 'src', separator: ':')
+test_env.set('FUSERMOUNT', fusermount_program.full_path())
 
 test_names = [
   'test-builder',