diff options
Diffstat (limited to 'lib/PublicInbox/Git.pm')
| -rw-r--r-- | lib/PublicInbox/Git.pm | 142 |
1 files changed, 130 insertions, 12 deletions
diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm index 16117277..a756684a 100644 --- a/lib/PublicInbox/Git.pm +++ b/lib/PublicInbox/Git.pm @@ -12,17 +12,60 @@ use warnings; use POSIX qw(dup2); require IO::Handle; use PublicInbox::Spawn qw(spawn popen_rd); +use base qw(Exporter); +our @EXPORT_OK = qw(git_unquote git_quote); + +my %GIT_ESC = ( + a => "\a", + b => "\b", + f => "\f", + n => "\n", + r => "\r", + t => "\t", + v => "\013", + '"' => '"', + '\\' => '\\', +); +my %ESC_GIT = map { $GIT_ESC{$_} => $_ } keys %GIT_ESC; + + +# unquote pathnames used by git, see quote.c::unquote_c_style.c in git.git +sub git_unquote ($) { + return $_[0] unless ($_[0] =~ /\A"(.*)"\z/); + $_[0] = $1; + $_[0] =~ s/\\([\\"abfnrtv])/$GIT_ESC{$1}/g; + $_[0] =~ s/\\([0-7]{1,3})/chr(oct($1))/ge; + $_[0]; +} + +sub git_quote ($) { + if ($_[0] =~ s/([\\"\a\b\f\n\r\t\013]|[^[:print:]])/ + '\\'.($ESC_GIT{$1}||sprintf("%0o",ord($1)))/egs) { + return qq{"$_[0]"}; + } + $_[0]; +} sub new { my ($class, $git_dir) = @_; my @st; $st[7] = $st[10] = 0; - bless { git_dir => $git_dir, st => \@st }, $class + # may contain {-tmp} field for File::Temp::Dir + bless { git_dir => $git_dir, st => \@st, -git_path => {} }, $class +} + +sub git_path ($$) { + my ($self, $path) = @_; + $self->{-git_path}->{$path} ||= do { + local $/ = "\n"; + chomp(my $str = $self->qx(qw(rev-parse --git-path), $path)); + $str; + }; } sub alternates_changed { my ($self) = @_; - my $alt = "$self->{git_dir}/objects/info/alternates"; + my $alt = git_path($self, 'objects/info/alternates'); my @st = stat($alt) or return 0; my $old_st = $self->{st}; # 10 - ctime, 7 - size @@ -30,9 +73,25 @@ sub alternates_changed { $self->{st} = \@st; } +sub last_check_err { + my ($self) = @_; + my $fh = $self->{err_c} or return; + sysseek($fh, 0, 0) or fail($self, "sysseek failed: $!"); + defined(sysread($fh, my $buf, -s $fh)) or + fail($self, "sysread failed: $!"); + $buf; +} + sub _bidi_pipe { - my ($self, $batch, $in, $out, $pid) = @_; - return if $self->{$pid}; + my ($self, $batch, $in, $out, $pid, $err) = @_; + if ($self->{$pid}) { + if (defined $err) { # "err_c" + my $fh = $self->{$err}; + sysseek($fh, 0, 0) or fail($self, "sysseek failed: $!"); + truncate($fh, 0) or fail($self, "truncate failed: $!"); + } + return; + } my ($in_r, $in_w, $out_r, $out_w); pipe($in_r, $in_w) or fail($self, "pipe failed: $!"); @@ -42,8 +101,14 @@ sub _bidi_pipe { fcntl($in_w, 1031, 4096) if $batch eq '--batch-check'; } - my @cmd = ('git', "--git-dir=$self->{git_dir}", qw(cat-file), $batch); + my @cmd = (qw(git), "--git-dir=$self->{git_dir}", + qw(-c core.abbrev=40 cat-file), $batch); my $redir = { 0 => fileno($out_r), 1 => fileno($in_w) }; + if ($err) { + open(my $fh, '+>', undef) or fail($self, "open.err failed: $!"); + $self->{$err} = $fh; + $redir->{2} = fileno($fh); + } my $p = spawn(\@cmd, undef, $redir); defined $p or fail($self, "spawn failed: $!"); $self->{$pid} = $p; @@ -118,17 +183,38 @@ sub batch_prepare ($) { _bidi_pipe($_[0], qw(--batch in out pid)) } sub check { my ($self, $obj) = @_; - $self->_bidi_pipe(qw(--batch-check in_c out_c pid_c)); + _bidi_pipe($self, qw(--batch-check in_c out_c pid_c err_c)); $self->{out_c}->print($obj, "\n") or fail($self, "write error: $!"); local $/ = "\n"; chomp(my $line = $self->{in_c}->getline); my ($hex, $type, $size) = split(' ', $line); - return if $type eq 'missing'; + + # Future versions of git.git may show 'ambiguous', but for now, + # we must handle 'dangling' below (and maybe some other oddball + # stuff): + # https://public-inbox.org/git/20190118033845.s2vlrb3wd3m2jfzu@dcvr/T/ + return if $type eq 'missing' || $type eq 'ambiguous'; + + if ($hex eq 'dangling' || $hex eq 'notdir' || $hex eq 'loop') { + $size = $type + length("\n"); + my $r = read($self->{in_c}, my $buf, $size); + defined($r) or fail($self, "read failed: $!"); + return; + } + ($hex, $type, $size); } sub _destroy { - my ($self, $in, $out, $pid) = @_; + my ($self, $in, $out, $pid, $expire) = @_; + my $rfh = $self->{$in} or return; + if (defined $expire) { + # at least FreeBSD 11.2 and Linux 4.20 update mtime of the + # read end of a pipe when the pipe is written to; dunno + # about other OSes. + my $mtime = (stat($rfh))[9]; + return if $mtime > $expire; + } my $p = delete $self->{$pid} or return; foreach my $f ($in, $out) { delete $self->{$f}; @@ -158,10 +244,12 @@ sub qx { <$fh> } +# returns true if there are pending "git cat-file" processes sub cleanup { - my ($self) = @_; - _destroy($self, qw(in out pid)); - _destroy($self, qw(in_c out_c pid_c)); + my ($self, $expire) = @_; + _destroy($self, qw(in out pid), $expire); + _destroy($self, qw(in_c out_c pid_c), $expire); + !!($self->{pid} || $self->{pid_c}); } # assuming a well-maintained repo, this should be a somewhat @@ -170,7 +258,8 @@ sub cleanup { sub packed_bytes { my ($self) = @_; my $n = 0; - foreach my $p (glob("$self->{git_dir}/objects/pack/*.pack")) { + my $pack_dir = git_path($self, 'objects/pack'); + foreach my $p (glob("$pack_dir/*.pack")) { $n += -s $p; } $n @@ -178,6 +267,35 @@ sub packed_bytes { sub DESTROY { cleanup(@_) } +sub local_nick ($) { + my ($self) = @_; + my $ret = '???'; + # don't show full FS path, basename should be OK: + if ($self->{git_dir} =~ m!/([^/]+)(?:/\.git)?\z!) { + $ret = "/path/to/$1"; + } + wantarray ? ($ret) : $ret; +} + +# show the blob URL for cgit/gitweb/whatever +sub src_blob_url { + my ($self, $oid) = @_; + # blob_url_format = "https://example.com/foo.git/blob/%s" + if (my $bfu = $self->{blob_url_format}) { + return map { sprintf($_, $oid) } @$bfu if wantarray; + return sprintf($bfu->[0], $oid); + } + local_nick($self); +} + +sub pub_urls { + my ($self) = @_; + if (my $urls = $self->{cgit_url}) { + return @$urls; + } + local_nick($self); +} + 1; __END__ =pod |