dgit-badcommit-fixup: Debugging (commented out)

[dgit.git] / dgit-badcommit-fixup

diff --git a/dgit-badcommit-fixup b/dgit-badcommit-fixup
index ec6f57c78395f6f9c5a4debf767fa5bc6911da19..98720e57d6eb2f67bfdf6b644b17a80b456c41e5 100755 (executable)
--- a/dgit-badcommit-fixup
+++ b/dgit-badcommit-fixup
@@ -97,13 +97,21 @@ sub rewrite_commit ($) {
     if ($newdata eq $olddata) {
        $newobj = $obj;
        $count{unchanged}++;
+#print STDERR "UNCHANGED $obj\n";
     } else {
        $newobj = hashobj $newdata, 'commit';
+#print STDERR "REWRITTEN $obj $newobj\n";
     }
     $$m= $newobj;
     return $newobj;
 }
 
+our @updates;
+
+sub filter_updates () {
+    @updates = grep { $_->[1] ne $_->[2] } @updates;
+}
+
 sub rewrite_tag ($) {
     my ($obj) = @_;
     $_ = getobj $obj, 'tag';
@@ -123,18 +131,83 @@ sub rewrite_tag ($) {
     return hashobj $_, 'tag';
 }
 
+sub edit_rewrite_map ($) {
+    my ($old) = @_;
+
+    filter_updates();
+    return $old unless @updates;
+
+    my $td = 'dgit-broken-fixup.tmp';
+    runcmd qw(rm -rf), $td;
+    mkdir $td, 0700 or die "$td $!";
+    chdir $td or die $!;
+    runcmd qw(git init -q);
+    runcmd qw(git config gc.auto 0);
+    runcmd qw(rm -rf .git/objects);
+    symlink "../../objects", ".git/objects" or die $!;
+
+    my %map;
+
+    if ($old) {
+       runcmd qw(git checkout -q), $old;
+       open M, "map" or die $!;
+       while (<M>) {
+           m/^(\w+)(?:\s+(\w+))?$/ or die;
+           $map{$1} = $2;
+           $count{rewrite_map_previous}++;
+       }
+       M->error and die $!;
+       close M or die $!;
+    }
+
+    foreach my $up (@updates) {
+       $map{ $up->[1] } = $up->[2];
+    }
+
+    open M, ">", "map" or die $!;
+    printf M "%s%s\n",
+       $_, (defined $map{$_} ? " $map{$_}" : "")
+       or die $!
+       foreach keys %map;
+    close M or die $!;
+
+    if (!$old) {
+       runcmd qw(git add map);
+    }
+
+    runcmd qw(git commit -q), 
+       qw(-m), 'dgit-badcommit-fixup',
+       qw(map);
+
+    $!=0; $?=0;
+    my $new = `git rev-parse HEAD`;
+    die "$? $!" if $?;
+    chomp $new or die;
+
+    chdir '..' or die $!;
+    runcmd qw(rm -rf), $td;
+
+    $count{rewrite_map_updated}++;
+
+    return $new;
+}
+
 $!=0; $?=0;
 my $refs=`git for-each-ref`;
 die "$? $!" if $?;
 
 chomp $refs;
 
-our @updates;
+our $org_rewrite_map;
 
 foreach my $rline (split /\n/, $refs) {
     my ($obj, $type, $refname) = 
        $rline =~ m/^(\w+)\s+(\w+)\s+(\S.*)/
        or die "$_ ?";
+    if ($refname eq 'refs/dgit-rewrite/map') {
+       $org_rewrite_map = $obj;
+       continue;
+    }
     my $rewrite;
     if ($type eq 'commit') {
        $rewrite = rewrite_commit($obj);
@@ -147,9 +220,20 @@ foreach my $rline (split /\n/, $refs) {
     push @updates, [ $refname, $obj, $rewrite ];
 }
 
-our $worktree;
+if ($bare eq 'true') {
+    my $new_rewrite_map = edit_rewrite_map($org_rewrite_map);
+    push @updates, [ 'refs/dgit-rewrite/map',
+                    ($org_rewrite_map // '0'x40),
+                    ($new_rewrite_map // '0'x40),
+                    1 ];
+}
+
+filter_updates();
 
-@updates = grep { $_->[1] ne $_->[2] } @updates;
+if (!@updates) {
+    print Dumper(\%count), "nothing to do\n";
+    exit 0;
+}
 
 #print Dumper(\@updates);
 
@@ -161,12 +245,14 @@ if ($real && $bare eq 'false') {
 }
 
 for my $up (@updates) {
-    my ($ref, $old, $new) = @$up;
+    my ($ref, $old, $new, $nobackup) = @$up;
     my $otherref = $ref;
     $otherref =~ s{^refs/}{};
     if ($real) {
-       print U <<END or die $!;
+       print U <<END or die $! unless $nobackup;
 create refs/dgit-badcommit/$otherref $old
+END
+       print U <<END or die $!;
 update $ref $new $old
 END
     } else {