lei: force --jobs=1,1 for SQLite < 3.8.3

SQLite prior to 3.8.3 did not reset its PRNG for generating
unique temporary file names, so it would barf on t/lei-up.t
occasionally due to O_EXCL -> EEXIST conflicts.

This fixes occasional test failures under CentOS 7.x which ships
SQLite 3.7.17.

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/PublicInbox/OverIdx.pm b/lib/PublicInbox/OverIdx.pm
index e7c96e14..a49ca6db 100644
--- a/lib/PublicInbox/OverIdx.pm
+++ b/lib/PublicInbox/OverIdx.pm
@@ -670,4 +670,16 @@ sub vivify_xvmd {
         $smsg->{-vivify_xvmd} = \@vivify_xvmd;
 }
 
+sub fork_ok {
+        return 1 if $DBD::SQLite::sqlite_version >= 3008003;
+        my ($opt) = @_;
+        my @j = split(/,/, $opt->{jobs} // '');
+        state $warned;
+        grep { $_ > 1 } @j and $warned //= warn('DBD::SQLite version is ',
+                 $DBD::SQLite::sqlite_version,
+                ", need >= 3008003 (3.8.3) for --jobs > 1\n");
+        $opt->{jobs} = '1,1';
+        undef;
+}
+
 1;