X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=infra%2Fdgit-repos-server;h=5599061de2a68cb8e997c66f2d81e48c489688a9;hp=6d7fb6316ca4e3f4fe464e679a77ff03970aa389;hb=5408b0c227d942af55442389894a9ed7338a55ce;hpb=850c5e51043c2eb3a9804877314edefb6156e816

diff --git a/infra/dgit-repos-server b/infra/dgit-repos-server
index 6d7fb631..5599061d 100755
--- a/infra/dgit-repos-server
+++ b/infra/dgit-repos-server
@@ -87,7 +87,7 @@ use POSIX;
 use Fcntl qw(:flock);
 use File::Path qw(rmtree);
 
-use Debian::Dgit;
+use Debian::Dgit qw(:DEFAULT :policyflags);
 
 open DEBUG, ">/dev/null" or die $!;
 
@@ -200,16 +200,46 @@ sub policyhook {
     return $r >> 8;
 }
 
+sub mkemptyrepo ($$) {
+    my ($dir,$sharedperm) = @_;
+    runcmd qw(git init --bare --quiet), "--shared=$sharedperm", $dir;
+}
+
+sub mkrepo_fromtemplate ($) {
+    my ($dir) = @_;
+    my $template = "$dgitrepos/_template";
+    debug "copy tempalate $template -> $dir";
+    my $r = system qw(cp -a --), $template, $dir;
+    !$r or die "create new repo $dir failed: $r $!";
+}
+
+sub movetogarbage () {
+    my $garbagerepo = "$dgitrepos/_tmp/${package}_garbage";
+    acquiretree($garbagerepo,1);
+    rmtree $garbagerepo;
+    rename $realdestrepo, $garbagerepo
+	or $! == ENOENT
+	or die "rename repo $realdestrepo to $garbagerepo: $!";
+}
+
+sub onwardpush () {
+    my @cmd = (qw(git send-pack), $destrepo);
+    push @cmd, qw(--force) if $policy & NOFFCHECK;
+    push @cmd, "$commit:refs/dgit/$suite",
+	       "$tagval:refs/tags/$tagname");
+    debugcmd @cmd;
+    $!=0;
+    my $r = system @cmd;
+    !$r or die "onward push to $destrepo failed: $r $!";
+}
+
 #----- git-receive-pack -----
 
 sub fixmissing__git_receive_pack () {
     mkrepotmp();
     $destrepo = "$dgitrepos/_tmp/${package}_prospective";
     acquiretree($destrepo, 1);
-    my $template = "$dgitrepos/_template";
-    debug "fixmissing copy tempalate $template -> $destrepo";
-    my $r = system qw(cp -a --), $template, $destrepo;
-    !$r or die "create new repo failed failed: $r $!";
+    mkrepo_fromtemplate($destrepo);
 }
 
 sub makeworkingclone () {
@@ -217,6 +247,7 @@ sub makeworkingclone () {
     $workrepo = "$dgitrepos/_tmp/${package}_incoming$$";
     acquiretree($workrepo, 1);
     runcmd qw(git clone -l -q --mirror), $destrepo, $workrepo;
+    rmtree "${workrepo}_fresh";
 }
 
 sub setupstunthook () {
@@ -234,6 +265,15 @@ END
     debug " stunt hook set up $prerecv";
 }
 
+sub dealwithfreshrepo () {
+    my $freshrepo = "${workrepo}_fresh";
+    if (!stat $freshrepo) {
+	$!==ENOENT or die "$freshrepo $!";
+	return;
+    }
+    $destrepo = $freshrepo;
+}
+
 sub maybeinstallprospective () {
     return if $destrepo eq $realdestrepo;
 
@@ -273,6 +313,8 @@ sub maybeinstallprospective () {
     die Dumper(\%got)." -- missing refs in new repo"
 	if grep { !$_ } values %got;
 
+    movetogarbage; # in case of FRESHREPO
+
     debug "install $destrepo => $realdestrepo";
     rename $destrepo, $realdestrepo or die $!;
     remove "$destrepo.lock" or die $!;
@@ -282,6 +324,7 @@ sub main__git_receive_pack () {
     makeworkingclone();
     setupstunthook();
     runcmd qw(git receive-pack), $workrepo;
+    dealwithfreshrepo();
     maybeinstallprospective();
 }
 
@@ -504,30 +547,37 @@ sub checks () {
     debug "translated version $v";
     $tagname eq "debian/$v" or die;
 
-    my ($policy) = policyhook(2,'push',$package,
-			      $version,$suite,$tagname,
-			      join(",",@delberatelies));
+    $policy = policyhook(NOFFCHECK|FRESHREPO, 'push',$package,
+			 $version,$suite,$tagname,
+			 join(",",@delberatelies));
 
     checksuite();
 
     # check that our ref is being fast-forwarded
     debug "oldcommit $oldcommit";
-    if (!($policy & 2) && $oldcommit =~ m/[^0]/) {
+    if (!($policy & NOFFCHECK) && $oldcommit =~ m/[^0]/) {
 	$?=0; $!=0; my $mb = `git merge-base $commit $oldcommit`;
 	chomp $mb;
 	$mb eq $oldcommit or reject "not fast forward on dgit branch";
     }
-}
 
-sub onwardpush () {
-    my @cmd = (qw(git send-pack), $destrepo,
-	       "$commit:refs/dgit/$suite",
-	       "$tagval:refs/tags/$tagname");
-    debugcmd @cmd;
-    $!=0;
-    my $r = system @cmd;
-    !$r or die "onward push failed: $r $!";
-}	
+    if ($policy & FRESHREPO) {
+	# This is troublesome.  We have been asked by the policy hook
+	# to receive the push into a fresh repo.  But of course we
+	# have actually already mostly received the push into the working
+	# repo.  (This is unavoidable because the instruction to use a new
+	# repo comes ultimately from the signed tag for the dgit push,
+	# which has to have been received into some repo.)
+	#
+	# So what we do is generate a fresh working repo right now and
+	# push the head and tag into it.  The presence of this fresh
+	# working repo is detected by the parent, which responds by
+	# making a fresh master repo from the template.
+
+	$destrepo = "${workrepo}_fresh"; # workrepo lock covers
+	mkrepo_fromtemplate $destrepo;
+    }
+}
 
 sub stunthook () {
     debug "stunthook";
@@ -549,8 +599,7 @@ sub fixmissing__git_upload_pack () {
     return if stat $destrepo;
     die $! unless $!==ENOENT;
     rmtree "$destrepo.new";
-    umask 022;
-    runcmd qw(git init --bare --quiet), "$destrepo.new";
+    mkemptyrepo "$destrepo.new", "0644";
     rename "$destrepo.new", $destrepo or die $!;
     unlink "$destrepo.lock" or die $!;
     close $lfh;
@@ -631,14 +680,9 @@ sub parseargsdispatch () {
 
     reject "unknown method" unless $mainfunc;
 
-    my ($policy, $pollock) = policyhook(4, 'check-package',$package);
-    if ($policy & 4) {
-	my $garbagerepo = "$dgitrepos/_tmp/${package}_garbage";
-	acquiretree($garbagerepo,1);
-	rmtree $garbagerepo;
-	rename $realdestrepo, $garbagerepo
-	    or $! == ENOENT
-	    or die "rename repo $destrepo to $garbagerepo: $!";
+    my ($policy, $pollock) = policyhook(FRESHREPO,'check-package',$package);
+    if ($policy & FRESHREPO) {
+	movetogarbage;
     }
     close $pollock or die $!;