[eog] Add eog_util_file_is_persistent()

[Claudio Saavedra <csaavedra src gnome org>]

commit 05a00504e896e00592f8f49525141474ae1755c5
Author: Claudio Saavedra <csaavedra igalia com>
Date:   Thu Sep 9 01:36:29 2010 +0300

    Add eog_util_file_is_persistent()
    
    This method checks whether a file is native and in a non-unmountable
    location.

 doc/reference/eog-sections.txt |    1 +
 src/eog-util.c                 |   28 ++++++++++++++++++++++++++++
 src/eog-util.h                 |    3 +++
 3 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/doc/reference/eog-sections.txt b/doc/reference/eog-sections.txt
index 3b495df..ce16d85 100644
--- a/doc/reference/eog-sections.txt
+++ b/doc/reference/eog-sections.txt
@@ -752,5 +752,6 @@ eog_util_string_array_to_list
 eog_util_string_array_make_absolute
 eog_util_launch_desktop_file
 eog_util_dot_dir
+eog_util_file_is_persistent
 </SECTION>
 
diff --git a/src/eog-util.c b/src/eog-util.c
index a16e3a2..642aabf 100644
--- a/src/eog-util.c
+++ b/src/eog-util.c
@@ -318,3 +318,31 @@ eog_util_filename_get_extension (const char * filename)
 
 	return g_strdup (begin);
 }
+
+
+/**
+ * eog_util_file_is_persistent:
+ * @file: a #GFile
+ *
+ * Checks whether @file is a non-removable local mount.
+ *
+ * Returns: %TRUE if @file is in a non-removable mount,
+ * %FALSE otherwise or when it is remote.
+ **/
+gboolean
+eog_util_file_is_persistent (GFile *file)
+{
+	GMount *mount;
+
+	if (!g_file_is_native (file))
+		return FALSE;
+
+	mount = g_file_find_enclosing_mount (file, NULL, NULL);
+	if (mount) {
+		if (g_mount_can_unmount (mount)) {
+			return FALSE;
+		}
+	}
+
+	return TRUE;
+}
diff --git a/src/eog-util.h b/src/eog-util.h
index 31f95ac..ba414c7 100644
--- a/src/eog-util.h
+++ b/src/eog-util.h
@@ -64,6 +64,9 @@ const    gchar *eog_util_dot_dir             (void);
 G_GNUC_INTERNAL
 char *  eog_util_filename_get_extension      (const char * filename_with_extension);
 
+G_GNUC_INTERNAL
+gboolean eog_util_file_is_persistent (GFile *file);
+
 G_END_DECLS
 
 #endif /* __EOG_UTIL_H__ */