[PATCH 78/95] lei_mirror: --manifest= affects destination, too

[Eric Wong]

This probably makes the most sense, if a user wants to
use an alternate path to read from, it's likely they
want to write it there, too.
---
 Documentation/public-inbox-clone.pod |  4 ++++
 lib/PublicInbox/LeiMirror.pm         | 16 +++++++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/Documentation/public-inbox-clone.pod 
b/Documentation/public-inbox-clone.pod
index 9bcb9967..2a7081ac 100644
--- a/Documentation/public-inbox-clone.pod
+++ b/Documentation/public-inbox-clone.pod
@@ -99,6 +99,10 @@ is specified where C<DIR> is an empty string (C<"">), then 
C<objstore>
 When incrementally updating an existing mirror, load the given
 manifest (typically C<manifest.js.gz>) to speed up updates.
 
+By default, public-inbox writes the retrieved manifest to
+C<$DESTINATION/manifest.js.gz>, this directive also
+changes the destination to the specified C<FILE>
+
 If C<FILE> does not start with C</>, C<./>, or C<../>, it is treated
 as relative to the C<DESTINATION> directory.  If only C<--manifest=>
 is specified where C<FILE> is an empty string (C<"">), then C<manifest.js.gz>
diff --git a/lib/PublicInbox/LeiMirror.pm b/lib/PublicInbox/LeiMirror.pm
index ec2ed557..2e94a2fa 100644
--- a/lib/PublicInbox/LeiMirror.pm
+++ b/lib/PublicInbox/LeiMirror.pm
@@ -826,7 +826,7 @@ sub load_current_manifest ($) {
        if (open(my $fh, '<', $fn)) {
                decode_manifest($fh, $fn, $fn);
        } elsif ($!{ENOENT}) { # non-fatal, we can just do it slowly
-               warn "open($fn): $!\n" if -d $self->{dst};
+               warn "open($fn): $!\n" if !$self->{-initial_clone};
                undef;
        } else {
                die "open($fn): $!\n";
@@ -955,10 +955,15 @@ sub try_manifest {
        my $path = $uri->path;
        chop($path) eq '/' or die "BUG: $uri not canonicalized";
        $uri->path($path . '/manifest.js.gz');
-       my $ft = File::Temp->new(TEMPLATE => '.manifest-XXXX',
-                               UNLINK => 1, TMPDIR => 1, SUFFIX => '.tmp');
+       my $manifest = $self->{-manifest} // "$self->{dst}/manifest.js.gz";
+       my %opt = (UNLINK => 1, SUFFIX => '.tmp', TMPDIR => 1);
+       if (!$self->{dry_run} && $manifest =~ m!\A(.+?)/[^/]+\z! and -d $1) {
+               $opt{DIR} = $1; # allows fast rename(2) w/o EXDEV
+               delete $opt{TMPDIR};
+       }
+       my $ft = File::Temp->new(TEMPLATE => '.manifest-XXXX', %opt);
        my $cmd = $curl->for_uri($lei, $uri, qw(-f -R -o), $ft->filename);
-       my %opt = map { $_ => $lei->{$_} } (0..2);
+       %opt = map { $_ => $lei->{$_} } (0..2);
        my $cerr = run_reap($lei, $cmd, \%opt);
        if ($cerr) {
                return try_scrape($self) if ($cerr >> 8) == 22; # 404 missing
@@ -1030,7 +1035,7 @@ EOM
 
        # set by clone_v2_prep/-I/--exclude
        dump_manifest($m => $ft) if delete $self->{-culled_manifest};
-       ft_rename($ft, "$self->{dst}/manifest.js.gz", 0666);
+       ft_rename($ft, $manifest, 0666);
        open my $x, '>', "$self->{dst}/mirror.done"; # for _wq_done_wait
 }
 
@@ -1045,6 +1050,7 @@ sub do_mirror { # via wq_io_do or public-inbox-clone
        my $lei = $self->{lei};
        $self->{dry_run} = 1 if $lei->{opt}->{'dry-run'};
        umask($lei->{client_umask}) if defined $lei->{client_umask};
+       $self->{-initial_clone} = 1 if !-d $self->{dst};
        eval {
                my $ic = $lei->{opt}->{'inbox-config'} //= 'always';
                $ic =~ /\A(?:v1|v2|always|never)\z/s or die <<"";