lei_to_mail: support for non-seekable outputs

Users may wish to pipe output to "git am", "spamc",
or similar, so we need to support those cases and
not bail out on lseek(2) or ftruncate(2) failures.

1 files changed, 28 insertions, 1 deletions

diff --git a/t/lei_to_mail.t b/t/lei_to_mail.t
index 5be4e285..f3cc71ad 100644
--- a/t/lei_to_mail.t
+++ b/t/lei_to_mail.t
@@ -6,6 +6,7 @@ use v5.10.1;
 use Test::More;
 use PublicInbox::TestCommon;
 use PublicInbox::Eml;
+use Fcntl qw(SEEK_SET);
 require_mods(qw(DBD::SQLite));
 use_ok 'PublicInbox::LeiToMail';
 my $from = "Content-Length: 10\nSubject: x\n\nFrom hell\n";
@@ -120,15 +121,41 @@ for my $zsfx (qw(gz bz2 xz)) { # XXX should we support zst, zz, lzo, lzma?
 }
 
 unlink $fn or BAIL_OUT $!;
+require PublicInbox::MboxReader;
 if ('default deduplication uses content_hash') {
         my $wcb = PublicInbox::LeiToMail->write_cb("mboxo:$fn", $lei);
         $wcb->(\(my $x = $buf), 'deadbeef', []) for (1..2);
         undef $wcb; # undef to commit changes
         my $cmp = '';
         open my $fh, '<', $fn or BAIL_OUT $!;
-        require PublicInbox::MboxReader;
         PublicInbox::MboxReader->mboxo($fh, sub { $cmp .= shift->as_string });
         is($cmp, $buf, 'only one message written');
 }
 
+{ # stdout support
+        open my $tmp, '+>', undef or BAIL_OUT $!;
+        local $lei->{1} = $tmp;
+        my $wcb = PublicInbox::LeiToMail->write_cb("mboxrd:/dev/stdout", $lei);
+        $wcb->(\(my $x = $buf), 'deadbeef', []);
+        undef $wcb; # commit
+        seek($tmp, 0, SEEK_SET) or BAIL_OUT $!;
+        my $cmp = '';
+        PublicInbox::MboxReader->mboxrd($tmp, sub { $cmp .= shift->as_string });
+        is($cmp, $buf, 'message written to stdout');
+}
+
+SKIP: { # FIFO support
+        use PublicInbox::Spawn qw(popen_rd which);
+        use POSIX qw(mkfifo);
+        my $fn = "$tmpdir/fifo";
+        mkfifo($fn, 0600) or skip("mkfifo not supported: $!", 1);
+        my $cat = popen_rd([which('cat'), $fn]);
+        my $wcb = PublicInbox::LeiToMail->write_cb("mboxo:$fn", $lei);
+        $wcb->(\(my $x = $buf), 'deadbeef', []);
+        undef $wcb; # commit
+        my $cmp = '';
+        PublicInbox::MboxReader->mboxo($cat, sub { $cmp .= shift->as_string });
+        is($cmp, $buf, 'message written to FIFO');
+}
+
 done_testing;