X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=dgit;h=65bc10f01f5c369d29b7d7a069999a8cac2fd78b;hb=0e6fdb25bacae95c16679692426b5ce7c2b150d9;hp=c6a3596605fd9657c17f877ad8f7e733e902f8db;hpb=d3009c4371f9209cd6745caa5e422355ac6692a7;p=dgit.git

diff --git a/dgit b/dgit
index c6a35966..65bc10f0 100755
--- a/dgit
+++ b/dgit
@@ -111,6 +111,8 @@ sub lref () { return "refs/heads/".lbranch(); }
 sub lrref () { return "refs/remotes/$remotename/".server_branch($csuite); }
 sub rrref () { return server_ref($csuite); }
 
+sub lrfetchrefs () { return "refs/dgit-fetch/$isuite"; }
+
 sub stripepoch ($) {
     my ($vsn) = @_;
     $vsn =~ s/^\d+\://;
@@ -162,6 +164,12 @@ sub deliberately ($) {
     return !!grep { $_ eq "--deliberately-$enquiry" } @deliberatelies;
 }
 
+sub deliberately_not_fast_forward () {
+    foreach (qw(not-fast-forward fresh-repo)) {
+	return 1 if deliberately($_) || deliberately("TEST-dgit-only-$_");
+    }
+}
+
 #---------- remote protocol support, common ----------
 
 # remote push initiator/responder protocol:
@@ -667,23 +675,6 @@ sub parsechangelog {
     return $c;
 }
 
-sub git_get_ref ($) {
-    my ($refname) = @_;
-    my $got = cmdoutput_errok @git, qw(show-ref --), $refname;
-    if (!defined $got) {
-	$?==256 or fail "git show-ref failed (status $?)";
-	printdebug "ref $refname= [show-ref exited 1]\n";
-	return '';
-    }
-    if ($got =~ m/^(\w+) \Q$refname\E$/m) {
-	printdebug "ref $refname=$1\n";
-	return $1;
-    } else {
-	printdebug "ref $refname= [no match]\n";
-	return '';
-    }
-}
-
 sub must_getcwd () {
     my $d = getcwd();
     defined $d or fail "getcwd failed: $!";
@@ -1271,20 +1262,13 @@ sub ensure_we_have_orig () {
     }
 }
 
-sub is_fast_fwd ($$) {
-    my ($ancestor,$child) = @_;
-    my @cmd = (@git, qw(merge-base), $ancestor, $child);
-    my $mb = cmdoutput_errok @cmd;
-    if (defined $mb) {
-	return git_rev_parse($mb) eq git_rev_parse($ancestor);
-    } else {
-	$?==256 or failedcmd @cmd;
-	return 0;
-    }
-}
-
 sub git_fetch_us () {
     runcmd_ordryrun_local @git, qw(fetch),access_giturl(),fetchspec();
+    if (deliberately_not_fast_forward) {
+	runcmd_ordryrun_local @git, qw(fetch -p), access_giturl(),
+	    map { "+refs/$_/*:".lrfetchrefs."/$_/*" }
+	    qw(tags heads);
+    }
 }
 
 sub fetch_from_archive () {
@@ -1677,11 +1661,12 @@ sub dopush ($) {
     responder_send_command("param head $head");
     responder_send_command("param csuite $csuite");
 
-    if ($forceflag && defined $lastpush_hash) {
-	git_for_each_tag_referring($lastpush_hash, sub {
-	    my ($objid,$fullrefname,$tagname) = @_;
-	    responder_send_command("supersedes $fullrefname=$objid");
-	    $supersedes{$fullrefname} = $objid;
+    if ($forceflag) {
+	git_for_each_ref(lrfetchrefs, sub {
+	    my ($objid,$objtype,$lrfetchrefname,$reftail) = @_;
+	    my $rrefname= substr($lrfetchrefname, length(lrfetchrefs) + 1);
+	    responder_send_command("supersedes $rrefname=$objid");
+	    $supersedes{$rrefname} = $objid;
 	});
     }
 
@@ -1845,8 +1830,7 @@ sub cmd_push {
     if (fetch_from_archive()) {
 	if (is_fast_fwd(lrref(), 'HEAD')) {
 	    # ok
-	} elsif (deliberately('not-fast-forward') ||
-		 deliberately('TEST-not-fast-forward-dgit-only')) {
+	} elsif (deliberately_not_fast_forward) {
 	    $forceflag = '+';
 	} else {
 	    fail "dgit push: HEAD is not a descendant".