v2writable: add NNTP article number regeneration support

Allow best-effort regeneration of NNTP article numbers from
cloned git repositories in addition to indexing Xapian Article
numbers will not remain consistent when we add purge support,
though.

1 files changed, 32 insertions, 3 deletions

diff --git a/script/public-inbox-index b/script/public-inbox-index
index cea35738..52d6ba70 100755
--- a/script/public-inbox-index
+++ b/script/public-inbox-index
@@ -23,8 +23,15 @@ if ($@) {
 }
 
 my $reindex;
-my %opts = ( '--reindex' => \$reindex );
+my $regen;
+my $jobs = undef;
+my %opts = (
+        '--reindex' => \$reindex,
+        '--regenerate' => \$regen,
+        '--jobs|j=i' => \$jobs,
+);
 GetOptions(%opts) or die "bad command-line args\n$usage";
+die "--jobs must be positive\n" if defined $jobs && $jobs <= 0;
 
 my @dirs;
 
@@ -93,8 +100,30 @@ sub index_dir {
         if (ref($repo) && ($repo->{version} || 1) == 2) {
                 eval { require PublicInbox::V2Writable };
                 die "v2 requirements not met: $@\n" if $@;
-                my $v2w = PublicInbox::V2Writable->new($repo);
-                $v2w->reindex;
+                my $v2w = eval {
+                        local $ENV{NPROC} = $jobs;
+                        PublicInbox::V2Writable->new($repo);
+                };
+                if (defined $jobs) {
+                        if ($jobs == 1) {
+                                $v2w->{parallel} = 0;
+                        } else {
+                                my $n = $v2w->{partitions};
+                                if ($jobs != $n) {
+                                        warn
+"Unable to respect --jobs=$jobs, inbox was created with $n partitions\n";
+                                }
+                        }
+                }
+                my $mm = $repo->mm;
+                my (undef, $max) = $mm->minmax if $mm;
+                if (defined($max) && !$reindex && !$regen) {
+                        die
+"v2 inboxes may only use --reindex and/or --regenerate once\n".
+"msgmap.sqlite3 is initialized\n";
+                }
+
+                $v2w->reindex($regen);
                 $v2w->done;
         } else {
                 my $s = PublicInbox::SearchIdx->new($repo, 1);