git-debrebase: Break out record_gdrlast

[dgit.git] / git-debrebase

diff --git a/git-debrebase b/git-debrebase
index 66167b2bafd501671885cbb7db43984d200d6aa5..8e347f15843b71deb7ad9e0450ce37478a2c8b93 100755 (executable)
--- 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 +428,11 @@ sub any_snags () {
     return $snags_forced || $snags_tripped;
 }
 
+sub record_gdrlast ($$) {
+    my ($gdrlast, $newvalue) = @_;
+    push @deferred_updates, "update $gdrlast $newvalue $git_null_obj";
+}
+
 sub gbp_pq_export ($$$) {
     my ($bname, $base, $tip) = @_;
     # must be run in a workarea.  $bname and patch-queue/$bname
@@ -446,11 +451,7 @@ 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 +688,8 @@ 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 +985,6 @@ 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{^\[(git-debrebase|dgit)[: ].*\]$}m) {
@@ -992,7 +994,7 @@ sub classify ($) {
        return $unknown->("octopus merge");
     }
 
-    if (!$ENV{GIT_DEBREBASE_EXPERIMENTAL_MERGE}) {
+    if (!$opt_merges) {
        return $unknown->("general two-parent merge");
     }
 
@@ -1313,7 +1315,7 @@ 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 $best_anchor;
@@ -1605,7 +1607,7 @@ sub walk ($;$$$) {
                    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);
@@ -1884,8 +1886,7 @@ sub stitch ($$$$$) {
            # ffq-prev is ahead of us, and the only tree changes it has
            # are possibly addition of things in debian/patches/.
            # Just wind forwards rather than making a pointless pseudomerge.
-           push @deferred_updates,
-               "update $gdrlast $ffq_prev_commitish $git_null_obj";
+           record_gdrlast $gdrlast, $ffq_prev_commitish;
            update_head_checkout $old_head, $ffq_prev_commitish,
                "stitch (fast forward)";
            return;
@@ -1898,7 +1899,7 @@ sub stitch ($$$$$) {
        '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";
 }
 
@@ -2477,19 +2478,25 @@ END
        my $mtag = cmdoutput @git, qw(describe --always --abbrev=0 --match),
            $mtag_pat;
        die "could not find suitable maintainer view tag $mtag_pat\n"
-           unless $mtag_pat =~ m{/};
+           unless $mtag =~ m{/};
        is_fast_fwd $mtag, 'HEAD' or
            die "HEAD is not FF from maintainer tag $mtag!";
        my $dtag = "archive/$mtag";
+       git_get_ref "refs/tags/$dtag" or
+           die "dgit view tag $dtag not found\n";
        is_fast_fwd $mtag, $dtag or
-           die "dgit view tag $dtag is not FF from maintainer tag $mtag";
+           die "dgit view tag $dtag is not FF from maintainer tag $mtag\n";
        print "will stitch in dgit view, $dtag\n";
        git_rev_parse $dtag;
     };
     if (!$previous_dgit_view) {
        $@ =~ s/^\n+//;
        chomp $@;
-       print STDERR "cannot stitch in dgit view: $@\n";
+       print STDERR <<END;
+Cannot confirm dgit view: $@
+Failed to stitch in dgit view (see messages above).
+dgit --overwrite will be needed on the first dgit push after conversion.
+END
     }
 
     snags_maybe_bail_early();
@@ -2533,6 +2540,9 @@ END
     ffq_check $work;
     snags_maybe_bail();
     update_head_checkout $old_head, $work, 'convert-from-gbp';
+    print <<END or die $!;
+git-debrebase: converted from patched-unapplied (gbp) branch format, OK
+END
 }
 
 sub cmd_convert_to_gbp () {
@@ -2753,7 +2763,7 @@ END
 
 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;
 
@@ -2848,6 +2858,7 @@ 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"