From 77eadb96882721c03d9b517a28a6468f2fa362a8 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 5 Feb 2017 23:04:45 +0000
Subject: [PATCH] git-debrebase: git-debrebase WIP minimal executable ?

---
 git-debrebase | 72 +++++++++++++++++++++++----------------------------
 1 file changed, 33 insertions(+), 39 deletions(-)

diff --git a/git-debrebase b/git-debrebase
index c25c18d9..b306d60d 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -25,6 +25,10 @@
 #    git-debrebase new-upstream [-f] UPSTREAM
 #    git-debrebase <git-rebase options>  # does debrebase start if necessary
 #
+#xxx
+# when starting must record original start (for ff)
+# and new rebase basis
+#
 #    git-ffrebase start [BASE] # records previous HEAD so it can be overwritten
 #                              # records base for future git-ffrebase
 #    git-ffrebase set-base BASE
@@ -197,8 +201,8 @@ sub classify ($) {
     return $unknown->("complex merge");
 }
 
-sub launder ($;$) {
-    my ($cur, $pseudos_must_overwrite, $wantdebonly) = @_;
+sub launder ($$$) {
+    my ($input, $pseudos_must_overwrite_this, $wantdebonly) = @_;
     # go through commits backwards
     # we generate two lists of commits to apply
     my (@deb_cl, @ups_cl);
@@ -214,6 +218,8 @@ sub launder ($;$) {
 	return (Msg => $ms);
     };
 
+    my $cur = $input;
+
     for (;;) {
 	$cl = classify $cur;
 	my $ty = $cl->{Type};
@@ -241,7 +247,8 @@ sub launder ($;$) {
 	    $queue->(\@ups_cl, "upstream");
 	    next;
 	} elsif ($ty eq 'Pseudomerge') {
-	    if (defined $pseudos_must_overwrite) {
+	    if (defined $pseudos_must_overwrite_this) {
+		confess 'xxx actually check this';
 	    }
 	    push @pseudomerges, $cl;
 	    $cur = $ty->{Contributor};
@@ -274,7 +281,7 @@ sub launder ($;$) {
                 $xmsg->("convert dgit import: upstream changes")
 	    };
 	    my $differs = get_differs $previous_breakwater, $cl->{Tree};
-	    $basis = launder $pseudomerges[0]{Overwritten}, 1;
+	    $basis = launder $pseudomerges[0]{Overwritten}, undef, 1;
 	    last;
 	} else {
 	    die "Reached difficult commit $cur: ".Dumper($cl);
@@ -340,47 +347,34 @@ sub launder ($;$) {
 	    $build = $newcommit;
 	}
     };
-}
 
+    runcmd @git, qw(diff-tree --quiet),
+	map { $wantdebonly ? "$_:debian" : $_ },
+	$input, $build;
 
-
-chdir $GIT_DIR
-
-			       
-if ($ARGV[0] eq 'launder') {
-    launder();
+    return $build;
 }
 
-use Data::Dumper;
-print Dumper(cfg('wombat.foo.bar'));
-
-
-	((git_cat_file "$t:debian/patches/series"
-	
-    
-    my @
-			   
-	
-
-	    return $r;
-	    $r->{Type} = '
-	    $r->{Type} = '
-	    return 
-	    # changes on debian/patches, discard it
-	    
-	    $cur = $p[0];
-	    next;
-	}
-	if ($d & DPAT) {
-	    
-
-    ($r->{Tree},) = 
-    
-		    
+sub get_head () { return git_rev_parse qw(HEAD); }
 
+sub update_head ($$) {
+    my ($old, $new, $mrest) = @_;
+    runcmd @git, qw(update-ref -m), "git-debrebase $mrest", $new, $old;
+}
 
+sub cmd_launder () {
+    my $old = get_head();
+    my $got = launder $old, 0, undef, 0;
+    update_head $old, $new, 'launder'; # no tree changes!
+}
 
+my $toplevel = runcmd @git, qw(rev-parse --show-toplevel);
+chdir $toplevel or die "chdir $toplevel: $!";
 
- when starting must record original start (for ff)
- and new rebase basis
+my $cmd = shift @ARGV;
+my $cmdfn = $cmd;
+$cmdfn =~ y/-/_/;
+$cmdfn = ${*::}{"cmd_$cmdfn"};
 
+$cmdfn or badusage "unknown git-debrebase sub-operation $cmd";
+$cmdfn->();
-- 
2.30.2