+# An "infopair" is a tuple [ $thing, $what ]
+# (often $thing is a commit hash; $what is a description)
+
+sub infopair_cond_equal ($$) {
+ my ($x,$y) = @_;
+ $x->[0] eq $y->[0] or fail <<END;
+$x->[1] ($x->[0]) not equal to $y->[1] ($y->[0])
+END
+};
+
+sub infopair_lrf_tag_lookup ($$) {
+ my ($tagnames, $what) = @_;
+ # $tagname may be an array ref
+ my @tagnames = ref $tagnames ? @$tagnames : ($tagnames);
+ printdebug "infopair_lrfetchref_tag_lookup $what @tagnames\n";
+ foreach my $tagname (@tagnames) {
+ my $lrefname = lrfetchrefs."/tags/$tagname";
+ my $tagobj = $lrfetchrefs_f{$lrefname};
+ next unless defined $tagobj;
+ printdebug "infopair_lrfetchref_tag_lookup $tagobj $tagname $what\n";
+ return [ git_rev_parse($tagobj), $what ];
+ }
+ fail @tagnames==1 ? <<END : <<END;
+Wanted tag $what (@tagnames) on dgit server, but not found
+END
+Wanted tag $what (one of: @tagnames) on dgit server, but not found
+END
+}
+
+sub infopair_cond_ff ($$) {
+ my ($anc,$desc) = @_;
+ is_fast_fwd($anc->[0], $desc->[0]) or fail <<END;
+$anc->[1] ($anc->[0]) .. $desc->[1] ($desc->[0]) is not fast forward
+END
+};
+
+sub pseudomerge_version_check ($$) {
+ my ($clogp, $archive_hash) = @_;
+
+ my $arch_clogp = commit_getclogp $archive_hash;
+ my $i_arch_v = [ (getfield $arch_clogp, 'Version'),
+ 'version currently in archive' ];
+ if (defined $overwrite_version) {
+ infopair_cond_equal([ $overwrite_version, '--overwrite= version' ],
+ $i_arch_v);
+ }
+
+ printdebug "pseudomerge_version_check i_arch_v @$i_arch_v\n";
+ return $i_arch_v;
+}
+
+sub pseudomerge_make_commit ($$$$$) {
+ my ($clogp, $dgitview, $archive_hash, $i_arch_v, $msg) = @_;
+ progress "Declaring that HEAD inciudes all changes in $i_arch_v->[0]...";
+
+ my $tree = cmdoutput qw(git rev-parse), "${dgitview}:";
+ my $authline = clogp_authline $clogp;
+
+ mkpath '.git/dgit';
+ my $pmf = ".git/dgit/pseudomerge";
+ open MC, ">", $pmf or die "$pmf $!";
+ print MC <<END, $msg or die $!;
+tree $tree
+parent $dgitview
+parent $archive_hash
+author $authline
+commiter $authline
+
+END
+ close MC or die $!;
+
+ return make_commit($pmf);
+}
+