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# Copyright (C) all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# common git alternates + all.git||ALL.git management code
package PublicInbox::MultiGit;
use strict;
use v5.10.1;
use PublicInbox::Spawn qw(run_die);
use PublicInbox::Import;
use File::Temp 0.19;
use List::Util qw(max);
sub new {
my ($cls, $topdir, $all, $epfx) = @_;
bless {
topdir => $topdir, # inboxdir || extindex.*.topdir
all => $all, # all.git or ALL.git
epfx => $epfx, # "git" (inbox) or "local" (lei/store)
}, $cls;
}
sub read_alternates {
my ($self, $moderef, $prune) = @_;
my $objpfx = "$self->{topdir}/$self->{all}/objects/";
my $f = "${objpfx}info/alternates";
my %alt; # line => score
my %seen; # $st_dev\0$st_ino => count
my $other = 0;
if (open(my $fh, '<', $f)) {
my $is_edir = defined($self->{epfx}) ?
qr!\A\Q../../$self->{epfx}\E/([0-9]+)\.git/objects\z! :
undef;
$$moderef = (stat($fh))[2] & 07777;
for my $rel (split(/^/m, do { local $/; <$fh> })) {
chomp(my $dir = $rel);
my $score;
if (defined($is_edir) && $dir =~ $is_edir) {
$score = $1 + 0;
substr($dir, 0, 0) = $objpfx;
} else { # absolute paths, if any (extindex)
$score = --$other;
}
if (my @st = stat($dir)) {
next if $seen{"$st[0]\0$st[1]"}++;
$alt{$rel} = $score;
} else {
warn "W: stat($dir) failed: $! ($f)";
if ($prune) {
++$$prune;
} else {
$alt{$rel} = $score;
}
}
}
} elsif (!$!{ENOENT}) {
die "E: open($f): $!";
}
(\%alt, \%seen);
}
sub epoch_dir { "$_[0]->{topdir}/$_[0]->{epfx}" }
sub write_alternates {
my ($self, $mode, $alt, @new) = @_;
my $all_dir = "$self->{topdir}/$self->{all}";
PublicInbox::Import::init_bare($all_dir);
my $out = join('', sort { $alt->{$b} <=> $alt->{$a} } keys %$alt);
my $info_dir = "$all_dir/objects/info";
my $fh = File::Temp->new(TEMPLATE => 'alt-XXXX', DIR => $info_dir);
my $f = $fh->filename;
print $fh $out, @new or die "print($f): $!";
chmod($mode, $fh) or die "fchmod($f): $!";
close $fh or die "close($f): $!";
my $fn = "$info_dir/alternates";
rename($f, $fn) or die "rename($f, $fn): $!";
$fh->unlink_on_destroy(0);
}
# returns true if new epochs exist
sub merge_epochs {
my ($self, $alt, $seen) = @_;
my $epoch_dir = epoch_dir($self);
if (opendir my $dh, $epoch_dir) {
my $has_new;
for my $bn (grep(/\A[0-9]+\.git\z/, readdir($dh))) {
my $rel = "../../$self->{epfx}/$bn/objects\n";
next if exists($alt->{$rel});
if (my @st = stat("$epoch_dir/$bn/objects")) {
next if $seen->{"$st[0]\0$st[1]"}++;
$alt->{$rel} = substr($bn, 0, -4) + 0;
$has_new = 1;
} else {
warn "E: stat($epoch_dir/$bn/objects): $!";
}
}
$has_new;
} else {
$!{ENOENT} ? undef : die "opendir($epoch_dir): $!";
}
}
sub fill_alternates {
my ($self) = @_;
my ($alt, $seen) = read_alternates($self, \(my $mode = 0644));
merge_epochs($self, $alt, $seen) and
write_alternates($self, $mode, $alt);
}
sub epoch_cfg_set {
my ($self, $epoch_nr) = @_;
run_die([qw(git config -f), epoch_dir($self)."/$epoch_nr.git/config",
'include.path', "../../$self->{all}/config" ]);
}
sub add_epoch {
my ($self, $epoch_nr) = @_;
my $git_dir = epoch_dir($self)."/$epoch_nr.git";
my $f = "$git_dir/config";
my $existing = -f $f;
PublicInbox::Import::init_bare($git_dir);
epoch_cfg_set($self, $epoch_nr) unless $existing;
fill_alternates($self);
$git_dir;
}
sub git_epochs {
my ($self) = @_;
if (opendir(my $dh, epoch_dir($self))) {
my @epochs = map {
substr($_, 0, -4) + 0; # drop ".git" suffix
} grep(/\A[0-9]+\.git\z/, readdir($dh));
wantarray ? sort { $b <=> $a } @epochs : (max(@epochs) // 0);
} elsif ($!{ENOENT}) {
wantarray ? () : 0;
} else {
die(epoch_dir($self).": $!");
}
}
1;
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