[PATCH v2 06/20] insert: move file from Maildir tmp to new

[Peter Wang <novalazy@gmail.com>]

Atomically move the new message file from the Maildir 'tmp' directory
to 'new'.
---
 notmuch-insert.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/notmuch-insert.c b/notmuch-insert.c
index 88e8533..63a04dc 100644
--- a/notmuch-insert.c
+++ b/notmuch-insert.c
@@ -94,6 +94,24 @@ maildir_open_tmp_file (void *ctx, const char *dir,
     return fd;
 }
 
+/* Atomically move the new message file from the Maildir 'tmp' directory
+ * to the 'new' directory.
+ *
+ * We follow the Dovecot recommendation to simply use rename()
+ * instead of link() and unlink().  See also:
+ * http://wiki.dovecot.org/MailboxFormat/Maildir#Mail_delivery
+ */
+static notmuch_bool_t
+maildir_move_tmp_to_new (const char *tmppath, const char *newpath)
+{
+    if (rename (tmppath, newpath) != 0) {
+	fprintf (stderr, "Error: rename() failed: %s\n", strerror (errno));
+	return FALSE;
+    }
+
+    return TRUE;
+}
+
 /* Copy the contents of fdin into fdout. */
 static notmuch_bool_t
 copy_fd_data (int fdin, int fdout)
@@ -150,6 +168,9 @@ insert_message (void *ctx, notmuch_database_t *notmuch, int fdin,
     }
     ret = copy_fd_data (fdin, fdout);
     close (fdout);
+    if (ret) {
+	ret = maildir_move_tmp_to_new (tmppath, newpath);
+    }
     if (!ret) {
 	unlink (tmppath);
     }
-- 
1.7.12.1