Add flatpak --supported-arches

app/flatpak-main.c

@@ -36,6 +36,7 @@
 static gboolean opt_verbose;
 static gboolean opt_version;
 static gboolean opt_default_arch;
+static gboolean opt_supported_arches;
 static gboolean opt_user;
 
 typedef struct
@@ -99,6 +100,7 @@ GOptionEntry global_entries[] = {
 static GOptionEntry empty_entries[] = {
   { "version", 0, 0, G_OPTION_ARG_NONE, &opt_version, "Print version information and exit", NULL },
   { "default-arch", 0, 0, G_OPTION_ARG_NONE, &opt_default_arch, "Print default arch and exit", NULL },
+  { "supported-arches", 0, 0, G_OPTION_ARG_NONE, &opt_supported_arches, "Print supported arches and exit", NULL },
   { NULL }
 };
 
@@ -214,6 +216,15 @@ flatpak_option_context_parse (GOptionContext     *context,
       exit (EXIT_SUCCESS);
     }
 
+  if (opt_supported_arches)
+    {
+      const char **arches = flatpak_get_arches ();
+      int i;
+      for (i = 0; arches[i] != NULL; i++)
+        g_print ("%s\n", arches[i]);
+      exit (EXIT_SUCCESS);
+    }
+
   if (!(flags & FLATPAK_BUILTIN_FLAG_NO_DIR))
     {
       dir = flatpak_dir_get (opt_user);

doc/flatpak-build.xml

@@ -86,14 +86,6 @@
                 </para></listitem>
             </varlistentry>
 
-           <varlistentry>
-                <term><option>--default-arch</option></term>
-
-                <listitem><para>
-                    Print the default arch and exit.
-                </para></listitem>
-            </varlistentry>
-
             <varlistentry>
                 <term><option>-r</option></term>
                 <term><option>--runtime</option></term>

doc/flatpak.xml

@@ -97,6 +97,23 @@
                     Print version information and exit.
                 </para></listitem>
             </varlistentry>
+
+           <varlistentry>
+                <term><option>--default-arch</option></term>
+
+                <listitem><para>
+                    Print the default arch and exit.
+                </para></listitem>
+            </varlistentry>
+
+            <varlistentry>
+                <term><option>--supported-arches</option></term>
+
+                <listitem><para>
+                    Print the supported arches in priority order and exit.
+                </para></listitem>
+            </varlistentry>
+
         </variablelist>
     </refsect1>
 

tests/test-basic.sh

@@ -36,6 +36,10 @@ assert_file_has_content help_out "^Usage:$"
 
 echo "ok help"
 
-${FLATPAK} --default-arch > /dev/null
+${FLATPAK} --default-arch > arch
+
+${FLATPAK} --supported-arches > arches
+
+assert_streq `head -1 arches` `cat arch`
 
 echo "ok default arch"