lei_mirror: reduce noise on interrupted clones

We don't need git-config or other commands failing loudly.
`git clone' and subcommands it spawns may still spew, but it's no
worse than interrupting `git clone' itself, now.

We accomplish this by localizing $LIVE (formerly %LIVE) and
detecting when its auto-vivification into a hashref goes
out-of-scope during the `DESTRUCT' ${^GLOBAL_PHASE}.

We can't use ${^GLOBAL_PHASE}, yet, either, since it appeared in
Perl 5.14 and we're still migrating slowly to Perl 5.12 before
going to 5.14.

diff --git a/lib/PublicInbox/LeiMirror.pm b/lib/PublicInbox/LeiMirror.pm
index b6e12b95bdb8ea6a5118574473eda3ff4513838f..f81f609469bcf788b474248ce70b9936d3055fca 100644 (file)
--- a/lib/PublicInbox/LeiMirror.pm
+++ b/lib/PublicInbox/LeiMirror.pm
@@ -20,7 +20,7 @@ use PublicInbox::Inbox;
 use PublicInbox::LeiCurl;
 use PublicInbox::OnDestroy;
 
-our %LIVE; # pid => callback
+our $LIVE; # pid => callback
 
 sub _wq_done_wait { # dwaitpid callback (via wq_eof)
        my ($arg, $pid) = @_;
@@ -68,7 +68,7 @@ sub try_scrape {
                        $n => [ URI->new($_), '' ]
                } @v2_urls; # uniq
                clone_v2($self, \%v2_epochs);
-               reap_live() while keys(%LIVE);
+               reap_live() while keys(%$LIVE);
                return;
        }
 
@@ -126,11 +126,11 @@ sub _get_txt_start { # non-fatal
        my $cmd = $self->{curl}->for_uri($lei, $uri, qw(--compressed -R -o),
                                        $ft->filename);
        my $jobs = $lei->{opt}->{jobs} // 1;
-       reap_live() while keys(%LIVE) >= $jobs;
+       reap_live() while keys(%$LIVE) >= $jobs;
        $lei->qerr("# @$cmd");
        return if $self->{dry_run};
        $self->{"-get_txt.$endpoint"} = [ $ft, $cmd, $uri ];
-       $LIVE{spawn($cmd, undef, $opt)} =
+       $LIVE->{spawn($cmd, undef, $opt)} =
                        [ \&_get_txt_done, $self, $endpoint, $fini ];
 }
 
@@ -237,10 +237,10 @@ sub run_reap {
 sub start_clone {
        my ($self, $cmd, $opt, $fini) = @_;
        my $jobs = $self->{lei}->{opt}->{jobs} // 1;
-       reap_live() while keys(%LIVE) >= $jobs;
+       reap_live() while keys(%$LIVE) >= $jobs;
        $self->{lei}->qerr("# @$cmd");
        return if $self->{dry_run};
-       $LIVE{spawn($cmd, undef, $opt)} = [ \&reap_clone, $self, $cmd, $fini ];
+       $LIVE->{spawn($cmd, undef, $opt)} = [ \&reap_clone, $self, $cmd, $fini ]
 }
 
 sub clone_v1 {
@@ -264,7 +264,7 @@ sub clone_v1 {
        defined($d) ? ($self->{'txt.description'} = $d) :
                _get_txt_start($self, 'description', $fini);
 
-       reap_live() until ($nohang || !keys(%LIVE)); # for non-manifest clone
+       reap_live() until ($nohang || !keys(%$LIVE)); # for non-manifest clone
 }
 
 sub parse_epochs ($$) {
@@ -345,14 +345,14 @@ sub reap_clone { # async, called via SIGCHLD
        my $cerr = $?;
        $? = 0; # don't let it influence normal exit
        if ($cerr) {
-               kill('TERM', keys %LIVE);
+               kill('TERM', keys %$LIVE);
                $self->{lei}->child_error($cerr, "@$cmd failed");
        }
 }
 
 sub v1_done { # called via OnDestroy
        my ($self) = @_;
-       return if $self->{dry_run};
+       return if $self->{dry_run} || !$LIVE;
        _write_inbox_config($self);
        my $dst = $self->{cur_dst} // $self->{dst};
        if (defined(my $o = $self->{-ent} ? $self->{-ent}->{owner} : undef)) {
@@ -375,7 +375,7 @@ sub v1_done { # called via OnDestroy
 
 sub v2_done { # called via OnDestroy
        my ($self) = @_;
-       return if $self->{dry_run};
+       return if $self->{dry_run} || !$LIVE;
        _write_inbox_config($self);
        require PublicInbox::MultiGit;
        my $dst = $self->{cur_dst} // $self->{dst};
@@ -398,7 +398,7 @@ sub v2_done { # called via OnDestroy
 
 sub reap_live {
        my $pid = waitpid(-1, 0) // die "waitpid(-1): $!";
-       if (my $x = delete $LIVE{$pid}) {
+       if (my $x = delete $LIVE->{$pid}) {
                my $cb = shift @$x;
                $cb->(@$x);
        } else {
@@ -564,7 +564,7 @@ sub try_manifest {
        my $cmd = $curl->for_uri($lei, $uri, '-R', '-o', $fn);
        my %opt = map { $_ => $lei->{$_} } (0..2);
        my $cerr = run_reap($lei, $cmd, \%opt);
-       local %LIVE;
+       local $LIVE;
        if ($cerr) {
                return try_scrape($self) if ($cerr >> 8) == 22; # 404 missing
                return $lei->child_error($cerr, "@$cmd failed");
@@ -627,7 +627,7 @@ EOM
                }
                clone_all($self, $todo, $m);
        }
-       reap_live() while keys(%LIVE);
+       reap_live() while keys(%$LIVE);
        return if $self->{lei}->{child_error} || $self->{dry_run};
 
        if (delete $self->{-culled_manifest}) { # set by clone_v2/-I/--exclude
@@ -656,7 +656,7 @@ sub do_mirror { # via wq_io_do
        eval {
                my $iv = $lei->{opt}->{'inbox-version'};
                if (defined $iv) {
-                       local %LIVE;
+                       local $LIVE;
                        return clone_v1($self) if $iv == 1;
                        return try_scrape($self) if $iv == 2;
                        die "bad --inbox-version=$iv\n";