badcommit-fixup: wip dummy commits

[dgit.git] / badcommit-fixup

diff --git a/badcommit-fixup b/badcommit-fixup
index 2c28e51096812dce38231da8a5c23c367574a499..42dd67b005fef11e8cb0335ba5c5c056362bebad 100755 (executable)
--- a/badcommit-fixup
+++ b/badcommit-fixup
@@ -10,10 +10,19 @@ use POSIX;
 use IPC::Open2;
 use Data::Dumper;
 
-die unless "@ARGV" eq "--test" or "@ARGV" eq "--real";
+my $real;
 
-my ($modeopt) = @ARGV;
-my $real = ($modeopt eq '--real');
+foreach my $a (@ARGV) {
+    if ($a eq '--test') {
+       $real = 0;
+    } elsif ($a eq '--real') {
+       $real = 1;
+    } else {
+       die "$a ?";
+    }
+}
+
+die unless defined $real;
 
 my $gcfpid = open2 \*GCFO, \*GCFI, 'git cat-file --batch' or die $!;
 
@@ -21,6 +30,14 @@ our %count;
 
 no warnings qw(recursion);
 
+sub runcmd {
+    system @_ and die "$! $?";
+}
+
+$!=0; $?=0;
+my $bare = `git rev-parse --is-bare-repository`;
+die "$? $!" if $?;
+
 sub getobj ($$) {
     my ($obj, $type) = @_;
     print GCFI $obj, "\n" or die $!;
@@ -85,6 +102,69 @@ sub rewrite_commit ($) {
     return $newobj;
 }
 
+sub rewrite_commit_adddummy ($$$) {
+    my ($ref, $veryold, $old) = @_;
+
+    die "$bare ?" unless $bare eq 'true';
+
+    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);
+    rmdir ".git/objects";
+    symlink "../objects", ".git/objects" or die $!;
+    runcmd qw(git checkout -q), $old;
+
+    open C, "debian/changelog" or die $!;
+    undef $/;
+    my $clog = <C>;
+    C->error and die $!;
+    close C or die $!;
+    defined $clog or die $!;
+
+    $!=0; $?=0;
+    my $v = `dpkg-parsechangelog`;
+    die "$ref $veryold $old $? $!" if $?;
+    $v =~ m/^Source: (\S+)$/m or die "$ref $veryold $old ?";
+    my $pkg = $1;
+    $v =~ m/^Version: (\S+)$/m or die "$ref $veryold $old ?";
+    my $vsn = $1;
+    $vsn .= "+~dgitfix";
+
+    open C, ">", "debian/changelog" or die $!;
+    print C <<END;
+$pkg ($vsn) UNRELEASED; urgency=low
+
+ * Additional commit, with slightly incremented version number,
+   to override bad commits generated by dgit due to #849041.
+ * No changes to the package.
+ * Not uploaded anywhere.
+
+ -- Ian Jackson <ijackson\@chiark.greenend.org.uk>  Thu, 05 Jan 2017 17:58:21 +0000
+
+END
+    print C $clog or die $!;
+    close C or die $!;
+
+    runcmd qw(git commit -q), 
+       '--author=Ian Jackson <ijackson@chiark.greenend.org.uk>',
+       qw(-m), 'Dummy changelog entry to work around #849041 fallout',
+       qw(debian/changelog);
+
+    $!=0; $?=0;
+    my $new = `git rev-parse HEAD`;
+    die "$? $!" if $?;
+
+    chdir '..' or die $!;
+    runcmd qw(rm -rf), $td;
+
+    $count{dummyadded}++;
+
+    return $new;
+}
+
 sub rewrite_tag ($) {
     my ($obj) = @_;
     $_ = getobj $obj, 'tag';
@@ -105,7 +185,7 @@ sub rewrite_tag ($) {
 }
 
 $!=0; $?=0;
-my $refs=`git-for-each-ref`;
+my $refs=`git for-each-ref`;
 die "$? $!" if $?;
 
 chomp $refs;
@@ -119,6 +199,9 @@ foreach my $rline (split /\n/, $refs) {
     my $rewrite;
     if ($type eq 'commit') {
        $rewrite = rewrite_commit($obj);
+       if ($refname =~ m{^refs/dgit/^[/]+$}) {
+           $rewrite = rewrite_commit_adddummy $refname, $obj, $rewrite;
+       }
     } elsif ($type eq 'tag') {
        $rewrite = rewrite_tag($obj);
     } else {
@@ -129,11 +212,15 @@ foreach my $rline (split /\n/, $refs) {
     push @updates, [ $refname, $obj, $rewrite ];
 }
 
+our $worktree;
+
+print Dumper(\@updates);
+
 open U, "|git update-ref -m 'dgit bad commit fixup' --stdin" or die $!;
 
-if ($real) {
+if ($real && $bare eq 'false') {
     print "detaching your HEAD\n" or die $!;
-    system 'git checkout --detach' and die "$! $?";
+    runcmd 'git checkout --detach';
 }
 
 for my $up (@updates) {