X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=git-debrebase;h=d80c8d35bb1875e509f658077eb3a1ed7cb7c69a;hp=42e8f7e3eec152892c35cd87666147749eea03ee;hb=8f28dfa084b6d63e385d7fe538214eee2f90ea9e;hpb=38d76341f1c203ec2365a0d5c81b750362531a99

diff --git a/git-debrebase b/git-debrebase
index 42e8f7e3..d80c8d35 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -50,11 +50,9 @@ usages:
 See git-debrebase(1), git-debrebase(5), dgit-maint-debrebase(7) (in dgit).
 END
 
-our ($opt_force, $opt_careful, $opt_noop_ok, @opt_anchors);
+our ($opt_force, $opt_noop_ok, $opt_merges, @opt_anchors);
 our ($opt_defaultcmd_interactive);
 
-$opt_careful = 0;
-
 our $us = qw(git-debrebase);
 
 our $wrecknoteprefix = 'refs/debrebase/wreckage';
@@ -198,6 +196,8 @@ sub get_tree ($;$$) {
 	return () if $type eq 'missing';
     }
 
+    confess "get_tree needs object not $x ?" unless $x =~ m{^[0-9a-f]+\:};
+
     our (@get_tree_memo, %get_tree_memo);
     my $memo = $get_tree_memo{$x};
     return @$memo if $memo;
@@ -428,6 +428,17 @@ sub any_snags () {
     return $snags_forced || $snags_tripped;
 }
 
+sub ffq_prev_branchinfo () {
+    my $current = git_get_symref();
+    return gdr_ffq_prev_branchinfo($current);
+}
+
+sub record_gdrlast ($$;$) {
+    my ($gdrlast, $newvalue, $oldvalue) = @_;
+    $oldvalue ||= $git_null_obj;
+    push @deferred_updates, "update $gdrlast $newvalue $oldvalue";
+}
+
 sub gbp_pq_export ($$$) {
     my ($bname, $base, $tip) = @_;
     # must be run in a workarea.  $bname and patch-queue/$bname
@@ -446,11 +457,7 @@ sub gbp_pq_export ($$$) {
 }
 
 
-# xxx allow merge resolution separately from laundering, before git merge
-#
-# xxx general gdr docs highlight forbidden things
-# xxx general gdr docs list allowable things ?
-# xxx general gdr docs explicitly forbid some rebase
+# MERGE-TODO allow merge resolution separately from laundering, before git merge
 
 # later/rework?
 #  use git-format-patch?
@@ -687,6 +694,8 @@ sub merge_series_patchqueue_convert ($$$) {
 	runcmd @git, qw(checkout -q -b mergec), $merged_pq;
 
 	merge_attempt_cmd($wrecknotes, qw(gbp pq import));
+	# MERGE-TODO consider git-format-patch etc. instead,
+	# since gbp pq doesn't always round-trip :-/
 
 	# OK now we are on patch-queue/merge, and we need to rebase
 	# onto the intended parent and drop the patches from each one
@@ -982,7 +991,6 @@ sub classify ($) {
 
     if (@p == 2 and
 	$r->{Msg} =~ m{^\[git-debrebase merged-breakwater.*\]$}m) {
-	# xxx ^ metadata tag needs adding to (5)
 	return $classify->("MergedBreakwaters");
     }
     if ($r->{Msg} =~ m{^\[(git-debrebase|dgit)[: ].*\]$}m) {
@@ -992,7 +1000,7 @@ sub classify ($) {
 	return $unknown->("octopus merge");
     }
 
-    if (!$ENV{GIT_DEBREBASE_EXPERIMENTAL_MERGE}) {
+    if (!$opt_merges) {
 	return $unknown->("general two-parent merge");
     }
 
@@ -1313,7 +1321,7 @@ sub walk ($;$$$) {
 	    # which was reachable via ffq-prev is no longer findable.
 	    # This is suboptimal, but if it all works we'll have done
 	    # the right thing.
-	    # xxx we should warn the user in the docs about this
+	    # MERGE-TODO we should warn the user in the docs about this
 
 	    my $ok=1;
 	    my $best_anchor;
@@ -1605,7 +1613,7 @@ sub walk ($;$$$) {
 		    printdebug "WALK REWRITING NOW cl=$cl procd=$procd\n";
 		}
 	    }
-	    if ($rewriting || $opt_careful) {
+	    if ($rewriting) {
 		read_tree_upstream $want_upstream, 0, $want_debian;
 
 		my $newtree = cmdoutput @git, qw(write-tree);
@@ -1738,11 +1746,6 @@ sub cmd_analyse () {
     STDOUT->error and die $!;
 }
 
-sub ffq_prev_branchinfo () {
-    my $current = git_get_symref();
-    return gdr_ffq_prev_branchinfo($current);
-}
-
 sub ffq_check ($;$$) {
     # calls $ff and/or $notff zero or more times
     # then returns either (status,message) where status is
@@ -1884,8 +1887,7 @@ sub stitch ($$$$$) {
 	    # ffq-prev is ahead of us, and the only tree changes it has
 	    # are possibly addition of things in debian/patches/.
 	    # Just wind forwards rather than making a pointless pseudomerge.
-	    push @deferred_updates,
-		"update $gdrlast $ffq_prev_commitish $git_null_obj";
+	    record_gdrlast $gdrlast, $ffq_prev_commitish;
 	    update_head_checkout $old_head, $ffq_prev_commitish,
 		"stitch (fast forward)";
 	    return;
@@ -1898,7 +1900,7 @@ sub stitch ($$$$$) {
 	'Declare fast forward / record previous work',
         "[git-debrebase pseudomerge: $prose]",
     ];
-    push @deferred_updates, "update $gdrlast $new_head $git_null_obj";
+    record_gdrlast $gdrlast, $new_head;
     update_head $old_head, $new_head, "stitch: $prose";
 }
 
@@ -2408,6 +2410,25 @@ sub check_series_has_all_patches ($) {
     }
 }
 
+sub begin_convert_from () {
+    my $head = get_head();
+    my ($ffqs, $ffqm, $symref, $ffq_prev, $gdrlast) = ffq_prev_branchinfo();
+
+    fail "ffq-prev exists, this is already managed by git-debrebase!"
+	if $ffq_prev && git_get_ref $ffq_prev;
+    snag 'already-converted',
+	"ahead of debrebase-last, this is already managed by git-debrebase!"
+	if $gdrlast && git_get_ref $gdrlast && is_fast_fwd $gdrlast, $head;
+    return ($head, undef);
+}
+
+sub complete_convert_from ($$$$) {
+    my ($old_head, $new_head, $gi, $mrest) = @_;
+    ffq_check $new_head;
+    snags_maybe_bail();
+    update_head_checkout $old_head, $new_head, $mrest;
+}
+
 sub cmd_convert_from_gbp () {
     badusage "want only 1 optional argument, the upstream git commitish"
 	unless @ARGV<=1;
@@ -2422,7 +2443,7 @@ sub cmd_convert_from_gbp () {
     my $upstream =
 	resolve_upstream_version($upstream_spec, $upstream_version);
 
-    my $old_head = get_head();
+    my ($old_head, $gdrlastinfo) = begin_convert_from();
 
     my $upsdiff = get_differs $upstream, $old_head;
     if ($upsdiff & D_UPS) {
@@ -2536,9 +2557,7 @@ END
 	}
     };
 
-    ffq_check $work;
-    snags_maybe_bail();
-    update_head_checkout $old_head, $work, 'convert-from-gbp';
+    complete_convert_from $old_head, $work, $gdrlastinfo, 'convert-from-gbp';
     print <<END or die $!;
 git-debrebase: converted from patched-unapplied (gbp) branch format, OK
 END
@@ -2598,7 +2617,7 @@ sub cmd_convert_from_dgit_view () {
 			 };
     }
 
-    my $head = get_head();
+    my ($head, $gdrlastinfo) = begin_convert_from();
 
     if (!$always) {
 	my $troubles = 0;
@@ -2754,15 +2773,13 @@ END
 
     printf STDERR "Yes, will base new branch on %s\n", $result->{Source};
 
-    ffq_check $result->{Result};
-    snags_maybe_bail();
-    update_head_checkout $head, $result->{Result},
+    complete_convert_from $head, $result->{Result}, $gdrlastinfo,
 	'convert-from-dgit-view';
 }
 
 sub cmd_record_resolved_merge () {
     badusage "record-resolved-merge takes no further arguments" if @ARGV;
-    # xxx needs documentation
+    # MERGE-TODO needs documentation
     my $new = get_head();
     my $method;
 
@@ -2857,6 +2874,7 @@ getoptions_main
 	   'anchor=s' => \@opt_anchors,
 	   '--dgit=s' => \($dgit[0]),
 	   'force!',
+	   'experimental-merge-resolution!', \$opt_merges,
 	   '-i:s' => sub {
 	       my ($opt,$val) = @_;
 	       badusage "git-debrebase: no cuddling to -i for git-rebase"