gpg: Auto-migrate existing secring.gpg.

* g10/migrate.c: New.
* g10/import.c (import_old_secring): New.
(import_one): Add arg silent.
(transfer_secret_keys): Add arg batch.
(import_secret_one): Add args batch and for_migration.
* g10/gpg.c (main): Call migration function.

1 files changed, 94 insertions, 0 deletions

diff --git a/g10/migrate.c b/g10/migrate.c
new file mode 100644
index 000000000..9a21cfe8e
--- /dev/null
+++ b/g10/migrate.c
@@ -0,0 +1,94 @@
+/* migrate.c - Migrate from earlier GnupG versions.
+ * Copyright (C) 2014 Werner Koch
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "gpg.h"
+#include "options.h"
+#include "keydb.h"
+#include "util.h"
+#include "main.h"
+
+
+#ifdef HAVE_DOSISH_SYSTEM
+# define V21_MIGRATION_FNAME "gpg-v21-migrated"
+#else
+# define V21_MIGRATION_FNAME ".gpg-v21-migrated"
+#endif
+
+
+/* Check whether a default secring.gpg from GnuPG < 2.1 exists and
+   import it if not yet done.  */
+void
+migrate_secring (ctrl_t ctrl)
+{
+  dotlock_t lockhd = NULL;
+  char *secring = NULL;
+  char *flagfile = NULL;
+
+  secring = make_filename (opt.homedir, "secring" EXTSEP_S "gpg", NULL);
+  if (access (secring, F_OK))
+    goto leave; /* Does not exist or is not readable.  */
+  flagfile = make_filename (opt.homedir, V21_MIGRATION_FNAME, NULL);
+  if (!access (flagfile, F_OK))
+    goto leave; /* Does exist - fine.  */
+
+  log_info ("starting migration from earlier GnuPG versions\n");
+
+  lockhd = dotlock_create (flagfile, 0);
+  if (!lockhd)
+    {
+      log_error ("can't allocate lock for '%s': %s\n",
+                 flagfile, gpg_strerror (gpg_error_from_syserror ()));
+      goto leave;
+    }
+  if (dotlock_take (lockhd, -1))
+    {
+      log_error ("can't lock '%s': %s\n",
+                 flagfile, gpg_strerror (gpg_error_from_syserror ()));
+      dotlock_destroy (lockhd);
+      lockhd = NULL;
+      goto leave;
+    }
+
+  log_info ("porting secret keys from '%s' to gpg-agent\n", secring);
+  if (!import_old_secring (ctrl, secring))
+    {
+      FILE *fp = fopen (flagfile, "w");
+      if (!fp || fclose (fp))
+        log_error ("error creating flag file '%s': %s\n",
+                   flagfile, gpg_strerror (gpg_error_from_syserror ()));
+      else
+        log_info ("migration succeeded\n");
+    }
+
+ leave:
+  if (lockhd)
+    {
+      dotlock_release (lockhd);
+      dotlock_destroy (lockhd);
+    }
+  xfree (flagfile);
+  xfree (secring);
+}