[gtk+] icontheme: allow directories with mtime 0

[Daniel Drake <dsd src gnome org>]

commit aba2de34436035513b11faa2da4c7c56cc38ede9
Author: Daniel Drake <drake endlessm com>
Date:   Mon Feb 23 14:49:08 2015 -0600

    icontheme: allow directories with mtime 0
    
    In order to provide a constant mtime between OS build and deploy time,
    while also maintaining a hardlink content-addressed model independent of
    timestamps, ostree sets all mtimes to 0.
    
    The icon cache code currently ignores directories with mtime 0, assuming
    they don't exist.
    
    Track directory existence in a more precise way.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745052

 gtk/gtkicontheme.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index 7e2f8ed..f47a956 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -315,8 +315,9 @@ typedef struct
 typedef struct 
 {
   gchar *dir;
-  time_t mtime; /* 0 == not existing or not a dir */
+  time_t mtime;
   GtkIconCache *cache;
+  gboolean exists;
 } IconThemeDirMtime;
 
 static void         gtk_icon_theme_finalize   (GObject          *object);
@@ -1133,10 +1134,13 @@ insert_theme (GtkIconTheme *icon_theme,
       dir_mtime = g_slice_new (IconThemeDirMtime);
       dir_mtime->cache = NULL;
       dir_mtime->dir = path;
-      if (g_stat (path, &stat_buf) == 0 && S_ISDIR (stat_buf.st_mode))
+      if (g_stat (path, &stat_buf) == 0 && S_ISDIR (stat_buf.st_mode)) {
         dir_mtime->mtime = stat_buf.st_mtime;
-      else
+        dir_mtime->exists = TRUE;
+      } else {
         dir_mtime->mtime = 0;
+        dir_mtime->exists = FALSE;
+      }
 
       priv->dir_mtimes = g_list_prepend (priv->dir_mtimes, dir_mtime);
     }
@@ -1370,11 +1374,13 @@ load_themes (GtkIconTheme *icon_theme)
       
       dir_mtime->dir = g_strdup (dir);
       dir_mtime->mtime = 0;
+      dir_mtime->exists = FALSE;
       dir_mtime->cache = NULL;
 
       if (g_stat (dir, &stat_buf) != 0 || !S_ISDIR (stat_buf.st_mode))
         continue;
       dir_mtime->mtime = stat_buf.st_mtime;
+      dir_mtime->exists = TRUE;
 
       dir_mtime->cache = _gtk_icon_cache_new_for_path (dir);
       if (dir_mtime->cache != NULL)
@@ -2714,12 +2720,12 @@ rescan_themes (GtkIconTheme *icon_theme)
       stat_res = g_stat (dir_mtime->dir, &stat_buf);
 
       /* dir mtime didn't change */
-      if (stat_res == 0 &&
+      if (stat_res == 0 && dir_mtime->exists &&
           S_ISDIR (stat_buf.st_mode) &&
           dir_mtime->mtime == stat_buf.st_mtime)
         continue;
       /* didn't exist before, and still doesn't */
-      if (dir_mtime->mtime == 0 &&
+      if (!dir_mtime->exists &&
           (stat_res != 0 || !S_ISDIR (stat_buf.st_mode)))
         continue;
 
@@ -3314,7 +3320,7 @@ theme_subdir_load (GtkIconTheme *icon_theme,
     {
       dir_mtime = (IconThemeDirMtime *)d->data;
 
-      if (dir_mtime->mtime == 0)
+      if (!dir_mtime->exists)
         continue; /* directory doesn't exist */
 
       full_dir = g_build_filename (dir_mtime->dir, subdir, NULL);