tree-wide: Use GLib autocleanups for libarchive

Define typedefs for read/write archives, and use the GLib
autocleanups for them.   Prep for updating libglnx to drop its
custom autocleanup macros.

Closes: #1042
Approved by: jlebon

src/libostree/ostree-libarchive-private.h

@@ -22,6 +22,8 @@
 
 #pragma once
 
+#include "config.h"
+
 #include <gio/gio.h>
 #include "libglnx.h"
 #ifdef HAVE_LIBARCHIVE
@@ -32,14 +34,10 @@
 G_BEGIN_DECLS
 
 #ifdef HAVE_LIBARCHIVE
-GLNX_DEFINE_CLEANUP_FUNCTION (void *, flatpak_local_free_write_archive, archive_write_free)
-#define ot_cleanup_write_archive __attribute__((cleanup (flatpak_local_free_write_archive)))
-
-GLNX_DEFINE_CLEANUP_FUNCTION (void *, flatpak_local_free_read_archive, archive_read_free)
-#define ot_cleanup_read_archive __attribute__((cleanup (flatpak_local_free_read_archive)))
-#else
-#define ot_cleanup_write_archive
-#define ot_cleanup_read_archive
+typedef struct archive OtAutoArchiveWrite;
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(OtAutoArchiveWrite, archive_write_free)
+typedef struct archive OtAutoArchiveRead;
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(OtAutoArchiveRead, archive_read_free)
 #endif
 
 G_END_DECLS

src/libostree/ostree-repo-libarchive.c

@@ -900,7 +900,7 @@ ostree_repo_write_archive_to_mtree (OstreeRepo                *self,
 {
 #ifdef HAVE_LIBARCHIVE
   gboolean ret = FALSE;
-  ot_cleanup_read_archive struct archive *a = archive_read_new ();
+  g_autoptr(OtAutoArchiveRead) a = archive_read_new ();
   OstreeRepoImportArchiveOptions opts = { 0, };
 
 #ifdef HAVE_ARCHIVE_READ_SUPPORT_FILTER_ALL

src/ostree/ot-builtin-export.c

@@ -68,7 +68,7 @@ ostree_builtin_export (int argc, char **argv, GCancellable *cancellable, GError
   g_autoptr(GFile) subtree = NULL;
   g_autofree char *commit = NULL;
   g_autoptr(GVariant) commit_data = NULL;
-  ot_cleanup_write_archive struct archive *a = NULL;
+  g_autoptr(OtAutoArchiveWrite) a = NULL;
   OstreeRepoExportArchiveOptions opts = { 0, };
 
   context = g_option_context_new ("COMMIT - Stream COMMIT to stdout in tar format");