Support mounting in /media for FHS compatibility

Add --enable-fhs-media configure option to mount in /media instead of
/run/media, for FHS compliance and backwards compatibility.

Usually /media is not a tmpfs, so make the "mounted-fs" state file persistant
in this case.

https://bugs.freedesktop.org/show_bug.cgi?id=51709
http://bugs.debian.org/680403
https://launchpad.net/bugs/1020759

configure.ac

@@ -115,6 +115,18 @@ AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)
 
 GOBJECT_INTROSPECTION_CHECK([0.6.2])
 
+# Behavior
+#
+
+AC_ARG_ENABLE(fhs-media,
+              [AS_HELP_STRING([--enable-fhs-media],
+                              [Mount devices in /media instead of /run/media [default=no]])],
+              fhs_media=yes,
+              fhs_media=no)
+if test "x$fhs_media" = "xyes"; then
+  AC_DEFINE([HAVE_FHS_MEDIA], 1, [Define to 1 to use /media for mounting])
+fi
+
 # Libraries
 #
 
@@ -229,6 +241,7 @@ echo "
         udevdir:                    ${udevdir}
         systemdsystemunitdir:       ${systemdsystemunitdir}
         using libsystemd-login:     ${have_libsystemd_login}
+        use /media for mounting:    ${fhs_media}
 
         compiler:                   ${CC}
         cflags:                     ${CFLAGS}

src/udiskslinuxfilesystem.c

@@ -79,6 +79,12 @@ static void filesystem_iface_init (UDisksFilesystemIface *iface);
 G_DEFINE_TYPE_WITH_CODE (UDisksLinuxFilesystem, udisks_linux_filesystem, UDISKS_TYPE_FILESYSTEM_SKELETON,
                          G_IMPLEMENT_INTERFACE (UDISKS_TYPE_FILESYSTEM, filesystem_iface_init));
 
+#ifdef HAVE_FHS_MEDIA
+#  define MOUNT_BASE "/media"
+#else
+#  define MOUNT_BASE "/run/media"
+#endif
+
 /* ---------------------------------------------------------------------------------------------------- */
 
 static void
@@ -892,23 +898,23 @@ calculate_mount_point (UDisksDaemon              *daemon,
     }
 
   /* If we know the user-name and it doesn't have any '/' character in
-   * it, mount in /run/media/$USER
+   * it, mount in MOUNT_BASE/$USER
    */
   if (!fs_shared && (user_name != NULL && strstr (user_name, "/") == NULL))
     {
-      mount_dir = g_strdup_printf ("/run/media/%s", user_name);
+      mount_dir = g_strdup_printf (MOUNT_BASE "/%s", user_name);
       if (!g_file_test (mount_dir, G_FILE_TEST_EXISTS))
         {
-          /* First ensure that /run/media exists */
-          if (g_mkdir ("/run/media", 0755) != 0 && errno != EEXIST)
+          /* First ensure that MOUNT_BASE exists */
+          if (g_mkdir (MOUNT_BASE, 0755) != 0 && errno != EEXIST)
             {
               g_set_error (error,
                            UDISKS_ERROR,
                            UDISKS_ERROR_FAILED,
-                           "Error creating directory /run/media: %m");
+                           "Error creating directory " MOUNT_BASE ": %m");
               goto out;
             }
-          /* Then create the per-user /run/media/$USER */
+          /* Then create the per-user MOUNT_BASE/$USER */
           if (g_mkdir (mount_dir, 0700) != 0 && errno != EEXIST)
             {
               g_set_error (error,

src/udisksstate.c

@@ -2235,7 +2235,14 @@ udisks_state_get (UDisksState           *state,
    * - could also mmap the file
    */
 
-  path = g_strdup_printf ("/run/udisks2/%s", key);
+#ifdef HAVE_FHS_MEDIA
+  /* /media usually isn't on a tmpfs, so we need to make this persistant */
+  if (strcmp (key, "mounted-fs") == 0)
+    path = g_strdup_printf (PACKAGE_LOCALSTATE_DIR "/lib/udisks2/%s", key);
+  else
+#endif
+    path = g_strdup_printf ("/run/udisks2/%s", key);
+
 
   /* see if it's already in the cache */
   ret = g_hash_table_lookup (state->cache, path);
@@ -2301,7 +2308,13 @@ udisks_state_set (UDisksState          *state,
   data = g_malloc (size);
   g_variant_store (normalized, data);
 
-  path = g_strdup_printf ("/run/udisks2/%s", key);
+#ifdef HAVE_FHS_MEDIA
+  /* /media usually isn't on a tmpfs, so we need to make this persistant */
+  if (strcmp (key, "mounted-fs") == 0)
+    path = g_strdup_printf (PACKAGE_LOCALSTATE_DIR "/lib/udisks2/%s", key);
+  else
+#endif
+    path = g_strdup_printf ("/run/udisks2/%s", key);
 
   g_hash_table_insert (state->cache, g_strdup (path), g_variant_ref (value));