core: Support for committing from any libarchive-supported format

We really want the ability to take a .tar.gz and directly import
it into a repository, without creating a temporary filesystem tree.

First, doing it this way is significantly faster.  Also, this allows
us to handle importing tar files with e.g. uid 0 files into packed
repositories as non-root, which is very useful for tests and builds.

src/libostree/ostree-libarchive-input-stream.h

@@ -0,0 +1,68 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2011 Colin Walters <walters@verbum.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Alexander Larsson <alexl@redhat.com>
+ */
+
+#ifndef __OSTREE_LIBARCHIVE_INPUT_STREAM_H__
+#define __OSTREE_LIBARCHIVE_INPUT_STREAM_H__
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define OSTREE_TYPE_LIBARCHIVE_INPUT_STREAM         (ostree_libarchive_input_stream_get_type ())
+#define OSTREE_LIBARCHIVE_INPUT_STREAM(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), OSTREE_TYPE_LIBARCHIVE_INPUT_STREAM, OstreeLibarchiveInputStream))
+#define OSTREE_LIBARCHIVE_INPUT_STREAM_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), OSTREE_TYPE_LIBARCHIVE_INPUT_STREAM, OstreeLibarchiveInputStreamClass))
+#define OSTREE_IS_LIBARCHIVE_INPUT_STREAM(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSTREE_TYPE_LIBARCHIVE_INPUT_STREAM))
+#define OSTREE_IS_LIBARCHIVE_INPUT_STREAM_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), OSTREE_TYPE_LIBARCHIVE_INPUT_STREAM))
+#define OSTREE_LIBARCHIVE_INPUT_STREAM_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), OSTREE_TYPE_LIBARCHIVE_INPUT_STREAM, OstreeLibarchiveInputStreamClass))
+
+typedef struct _OstreeLibarchiveInputStream         OstreeLibarchiveInputStream;
+typedef struct _OstreeLibarchiveInputStreamClass    OstreeLibarchiveInputStreamClass;
+typedef struct _OstreeLibarchiveInputStreamPrivate  OstreeLibarchiveInputStreamPrivate;
+
+struct _OstreeLibarchiveInputStream
+{
+  GInputStream parent_instance;
+
+  /*< private >*/
+  OstreeLibarchiveInputStreamPrivate *priv;
+};
+
+struct _OstreeLibarchiveInputStreamClass
+{
+  GInputStreamClass parent_class;
+
+  /*< private >*/
+  /* Padding for future expansion */
+  void (*_g_reserved1) (void);
+  void (*_g_reserved2) (void);
+  void (*_g_reserved3) (void);
+  void (*_g_reserved4) (void);
+  void (*_g_reserved5) (void);
+};
+
+GType          ostree_libarchive_input_stream_get_type     (void) G_GNUC_CONST;
+
+GInputStream * ostree_libarchive_input_stream_new          (struct archive  *a);
+
+G_END_DECLS
+
+#endif /* __OSTREE_LIBARCHIVE_INPUT_STREAM_H__ */