diff options
Diffstat (limited to 'lib/PublicInbox/RepoSnapshot.pm')
-rw-r--r-- | lib/PublicInbox/RepoSnapshot.pm | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/lib/PublicInbox/RepoSnapshot.pm b/lib/PublicInbox/RepoSnapshot.pm new file mode 100644 index 00000000..460340e6 --- /dev/null +++ b/lib/PublicInbox/RepoSnapshot.pm @@ -0,0 +1,95 @@ +# Copyright (C) all contributors <meta@public-inbox.org> +# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt> + +# cgit-compatible /snapshot/ endpoint for WWW coderepos +package PublicInbox::RepoSnapshot; +use v5.12; +use PublicInbox::Git; +use PublicInbox::Qspawn; +use PublicInbox::GitAsyncCat; +use PublicInbox::WwwStatic qw(r); + +# Not using standard mime types since the compressed tarballs are +# special or do not match my /etc/mime.types. Choose what gitweb +# and cgit agree on for compatibility. +our %FMT_TYPES = ( + 'tar' => 'application/x-tar', + 'tar.gz' => 'application/x-gzip', + 'tar.bz2' => 'application/x-bzip2', + 'tar.xz' => 'application/x-xz', + 'zip' => 'application/x-zip', +); + +our %FMT_CFG = ( + 'tar.xz' => 'xz -c', + 'tar.bz2' => 'bzip2 -c', + # not supporting lz nor zstd for now to avoid format proliferation + # and increased cache overhead required to handle extra formats. +); + +my $SUFFIX = join('|', map { quotemeta } keys %FMT_TYPES); + +# TODO deal with tagged blobs + +sub archive_hdr { # parse_hdr for Qspawn + my ($r, $bref, $ctx) = @_; + $r or return [500, [qw(Content-Type text/plain Content-Length 0)], []]; + my $fn = "$ctx->{snap_pfx}.$ctx->{snap_fmt}"; + my $type = $FMT_TYPES{$ctx->{snap_fmt}} // + die "BUG: bad fmt: $ctx->{snap_fmt}"; + [ 200, [ 'Content-Type', "$type; charset=UTF-8", + 'Content-Disposition', qq(inline; filename="$fn"), + 'ETag', qq("$ctx->{etag}") ] ]; +} + +sub archive_cb { + my ($ctx) = @_; + my @cfg; + if (my $cmd = $FMT_CFG{$ctx->{snap_fmt}}) { + @cfg = ('-c', "tar.$ctx->{snap_fmt}.command=$cmd"); + } + my $qsp = PublicInbox::Qspawn->new(['git', @cfg, + "--git-dir=$ctx->{git}->{git_dir}", 'archive', + "--prefix=$ctx->{snap_pfx}/", + "--format=$ctx->{snap_fmt}", $ctx->{treeish}]); + $qsp->psgi_return($ctx->{env}, undef, \&archive_hdr, $ctx); +} + +sub ver_check { # git->check_async callback + my ($oid, $type, $size, $ctx) = @_; + if ($type eq 'missing') { # try 'v' and 'V' prefixes + my $pfx = shift @{$ctx->{try_pfx}} or return + delete($ctx->{env}->{'qspawn.wcb'})->(r(404)); + my $v = $ctx->{treeish} = $pfx.$ctx->{snap_ver}; + return $ctx->{env}->{'pi-httpd.async'} ? + async_check($ctx, $v, \&ver_check, $ctx) : + $ctx->{git}->check_async($v, \&ver_check, $ctx); + } + $ctx->{etag} = $oid; + archive_cb($ctx); +} + +sub srv { + my ($ctx, $fn) = @_; + return if $fn =~ /["\s]/s; + $fn =~ s/\.($SUFFIX)\z//o or return; + $ctx->{snap_fmt} = $1; + my $pfx = $ctx->{git}->local_nick // return; + $pfx =~ s/(?:\.git)?\z/-/; + substr($fn, 0, length($pfx)) eq $pfx or return; + $ctx->{snap_pfx} = $fn; + my $v = $ctx->{snap_ver} = substr($fn, length($pfx), length($fn)); + $ctx->{treeish} = $v; # try without [vV] prefix, first + @{$ctx->{try_pfx}} = qw(v V); # cf. cgit:ui-snapshot.c + sub { + $ctx->{env}->{'qspawn.wcb'} = $_[0]; + if ($ctx->{env}->{'pi-httpd.async'}) { + async_check($ctx, $v, \&ver_check, $ctx); + } else { + $ctx->{git}->check_async($v, \&ver_check, $ctx); + $ctx->{git}->check_async_wait; + } + } +} + +1; |