inboxwritable: add assert_usable_dir sub

And use it for mda, since "0" could be a usable directory
if somebody insists on using relative paths...

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/PublicInbox/InboxWritable.pm b/lib/PublicInbox/InboxWritable.pm
index ab7b0ed5..9eab394d 100644
--- a/lib/PublicInbox/InboxWritable.pm
+++ b/lib/PublicInbox/InboxWritable.pm
@@ -30,12 +30,19 @@ sub new {
         $self;
 }
 
+sub assert_usable_dir {
+        my ($self) = @_;
+        my $dir = $self->{inboxdir};
+        return $dir if defined($dir) && $dir ne '';
+        die "no inboxdir defined for $self->{name}\n";
+}
+
 sub init_inbox {
         my ($self, $shards, $skip_epoch, $skip_artnum) = @_;
         # TODO: honor skip_artnum
         my $v = $self->{version} || 1;
         if ($v == 1) {
-                my $dir = $self->{inboxdir} or die "no inboxdir in inbox\n";
+                my $dir = assert_usable_dir($self);
                 PublicInbox::Import::init_bare($dir);
         } else {
                 my $v2w = importer($self);