[ostree] core: Add a few more GIO utility functions

[Colin Walters <walters src gnome org>]

commit b221b0fdd6fc993d9f2377d8d2f5db6efc5412ab
Author: Colin Walters <walters verbum org>
Date:   Sat Mar 31 10:32:02 2012 -0400

    core: Add a few more GIO utility functions

 src/libotutil/ot-gio-utils.c |   85 ++++++++++++++++++++++++++++++++++++++++++
 src/libotutil/ot-gio-utils.h |   11 +++++
 2 files changed, 96 insertions(+), 0 deletions(-)
---
diff --git a/src/libotutil/ot-gio-utils.c b/src/libotutil/ot-gio-utils.c
index 1c8c5dc..15dddc7 100644
--- a/src/libotutil/ot-gio-utils.c
+++ b/src/libotutil/ot-gio-utils.c
@@ -77,6 +77,91 @@ ot_gfile_ensure_directory (GFile     *dir,
   return ret;
 }
 
+GFile *
+ot_gfile_get_child_strconcat (GFile *parent,
+                              const char *first,
+                              ...) 
+{
+  va_list args;
+  GFile *ret;
+  GString *buf;
+  const char *arg;
+
+  g_return_val_if_fail (first != NULL, NULL);
+
+  va_start (args, first);
+  
+  buf = g_string_new (first);
+  
+  while ((arg = va_arg (args, const char *)) != NULL)
+    g_string_append (buf, arg);
+
+  ret = g_file_get_child (parent, buf->str);
+  
+  g_string_free (buf, TRUE);
+
+  return ret;
+}
+
+/**
+ * ot_gfile_unlink:
+ * @path: Path to file
+ * @cancellable: a #GCancellable
+ * @error: a #GError
+ *
+ * Like g_file_delete(), except this function does not follow Unix
+ * symbolic links, and will delete a symbolic link even if it's
+ * pointing to a nonexistent file.  In other words, this function
+ * merely wraps the raw Unix function unlink().
+ *
+ * Returns: %TRUE on success, %FALSE on error
+ */
+gboolean
+ot_gfile_unlink (GFile          *path,
+                 GCancellable   *cancellable,
+                 GError        **error)
+{
+  if (g_cancellable_set_error_if_cancelled (cancellable, error))
+    return FALSE;
+
+  if (unlink (ot_gfile_get_path_cached (path)) < 0)
+    {
+      ot_util_set_error_from_errno (error, errno);
+      return FALSE;
+    }
+  return TRUE;
+}
+
+/**
+ * ot_gfile_rename:
+ * @from: Current path
+ * @to: New path
+ * @cancellable: a #GCancellable
+ * @error: a #GError
+ *
+ * This function wraps the raw Unix function rename().
+ *
+ * Returns: %TRUE on success, %FALSE on error
+ */
+gboolean
+ot_gfile_rename (GFile          *from,
+                 GFile          *to,
+                 GCancellable   *cancellable,
+                 GError        **error)
+{
+  if (g_cancellable_set_error_if_cancelled (cancellable, error))
+    return FALSE;
+
+  if (rename (ot_gfile_get_path_cached (from),
+              ot_gfile_get_path_cached (to)) < 0)
+    {
+      ot_util_set_error_from_errno (error, errno);
+      return FALSE;
+    }
+  return TRUE;
+
+}
+
 gboolean
 ot_gfile_load_contents_utf8 (GFile         *file,
                              char         **contents_out,
diff --git a/src/libotutil/ot-gio-utils.h b/src/libotutil/ot-gio-utils.h
index 46c8e3c..5fda5da 100644
--- a/src/libotutil/ot-gio-utils.h
+++ b/src/libotutil/ot-gio-utils.h
@@ -36,6 +36,8 @@ G_BEGIN_DECLS
 
 GFileType ot_gfile_type_for_mode (guint32 mode);
 
+GFile *ot_gfile_get_child_strconcat (GFile *parent, const char *first, ...) G_GNUC_NULL_TERMINATED;
+
 GFile *ot_gfile_new_for_path (const char *path);
 
 const char *ot_gfile_get_path_cached (GFile *file);
@@ -44,6 +46,15 @@ const char *ot_gfile_get_basename_cached (GFile *file);
 
 gboolean ot_gfile_ensure_directory (GFile *dir, gboolean with_parents, GError **error);
 
+gboolean ot_gfile_rename (GFile          *src,
+                          GFile          *dest,
+                          GCancellable   *cancellable,
+                          GError        **error);
+
+gboolean ot_gfile_unlink (GFile          *path,
+                          GCancellable   *cancellable,
+                          GError        **error);
+
 gboolean ot_gfile_load_contents_utf8 (GFile         *file,
                                       char         **contents_out,
                                       char         **etag_out,