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authorIan Jackson <ijackson@chiark.greenend.org.uk>2018-01-23 17:32:29 +0000
committerIan Jackson <ijackson@chiark.greenend.org.uk>2018-06-16 12:25:49 +0100
commit825270a6f7b5506c9bb5f444243da7c831408f54 (patch)
treec71acfb6b166828867d3f6d9058728825d982393 /git-debrebase
parent432493a8a7894872312451fac17918ab8dbb5576 (diff)
git-debrebase: wip new-upstream
before needing to unpick multi-upstream also realise need to parse breakwater to check we are not ff only due to combination merge Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
Diffstat (limited to 'git-debrebase')
-rwxr-xr-xgit-debrebase119
1 files changed, 119 insertions, 0 deletions
diff --git a/git-debrebase b/git-debrebase
index 128f2f1..b273938 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -18,6 +18,10 @@
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
+# git-debrebase new-upstreams-v0 \
+# NEW-VERSION ORIG-COMMITISH
+# [EXTRA-ORIG-NAME EXTRA-ORIG-COMMITISH ...]
+
# usages:
# git-debrebase status
# git-debrebase start # like ffqrebase start + debrebase launder
@@ -763,6 +767,121 @@ sub cmd_analyse () {
STDOUT->error and die $!;
}
+sub cmd_new_upstream_v0 () {
+ badusage
+ "need NEW-VERSION ORIG-COMMITISH [EXTRA-ORIG-NAME EXTRA-ORIG-COMMITISH...]"
+ unless @ARGV % 2 == 0 and @ARGV >= 2;
+ # tree should be clean and this is not checked
+ # automatically and unconditionally launders before rebasing
+ # if rebase --abort is used, laundering has still been done
+
+ # parse args - low commitment
+ my $new_version = new Dpkg::Version scalar(shift @ARGV), 1;
+ my $new_upstream_version = $new_version->version();
+ my $new_orig_commitish = git_rev_parse shift @ARGV;
+ my @extra_origs;
+ while (@ARGV) {
+ my $xo = {
+ Name => shift @ARGV,
+ New => git_rev_parse shift @ARGV,
+ };
+ die unless $xo->{Name} =~ m/^$extra_orig_namepart_re$/;
+ push @extra_origs, $xo;
+ }
+
+ # now we need to investigate the branch this generates the
+ # laundered version but we don't switch to it yet
+ my $old = get_head();
+ my ($laundered_tip,$breakwater) = walk $old;
+
+ my $breakwater_cl = classify $breakwater;
+ my $old_orig_pi = $breakwater_cl->{OrigParents}[0];
+
+ fresh_workarea();
+ in_workarea sub {
+ my $ff_still_ok = 1;
+
+ my $ffnot = sub {
+ my ($msg) = @_;
+ $ff_still_ok = 0;
+ print STDERR "upstream not fast forward: $msg\n";
+ };
+
+ if (@extra_origs) {
+ # check fast forward, and make new combined-orig commit
+ my $old_orig_ci = parsecommit $old_orig_pi->{CommitId};
+ my $n_old_origs = scalar @{ $old_orig_cp->{Parents} };
+ @{ $n_old_origs } == @extra_origs+1 or
+ $ffnot->(sprintf
+ "previous breakwater upstream has %d parents".
+ " but new upstream has %d pieces, cannot check ff",
+ $n_old_origs,
+ (1 + scalar @extra_origs));
+ }
+
+ my @upstream_merge_parents;
+
+ foreach my $piece_ix (0..$n_old_origs-1) {
+ my $prevpc = $breakwater.'^'.($old_orig_pi->{Ix} + 1);
+ if (@extra_origs) {
+ $prevpc .= '^'.($piece_ix + 1);
+ }
+ die unless $ git_rev_parse $prevpc;
+ my ($newpc,$newdesc,$pcname);
+ if (!$piece_ix) {
+ $newpc = $new_orig_commitish;
+ $newdesc = 'new main upstream piece';
+ } else {
+ $newpc = $extra_origs[$piece_ix+1]{New};
+ $pcname = $extra_origs[$piece_ix-1]{Name}
+ $newdesc = "new upstream extra piece \`$pcname";
+ }
+ $ffwant->($prevpc, "previous upstream piece ($prevpc)",
+ $newpc, "newdesc ($newpc)");
+
+ push @upstream_merge_parents, $newpc;
+
+ my @cmd = @git, qw(read-tree);
+ if (defined $pcname) {
+ push @cmd, "-prefix=$pcname/";
+ runcmd @git, qw(rm --cached -f --ignore-unmatch), $pcname;
+ }
+ push @cmd, $newpc;
+ runcmd @cmd;
+ }
+
+ # index now contains the new upstream
+ if (!$ff_still_ok) {
+ die "upstreams not fast forward, stopping".
+ " (xxx should be an override option)";
+ }
+
+ if (@extra_origs) {
+ # need to make the upstream subtree merge commit
+ my $us_tree = cmdoutput @git, qw(write-tree);
+ my @cmd = @git, qw(commit-tree), $us_tree;
+ if ($ff_still_ok) {
+ push @cmd, qw(-p),
+ } else {
+ die 'do we want to make ff from previous upstream comb?"';
+ }
+ push @cmd, qw(-p), $_ foreach @upstream_merge_parents;
+ push @cmd, qw(-m), "Combine upstreams for $new_upstream_version";
+ push @cmd, qw(-m),
+ "[git-debrebase combine-upstreams . ".
+ (join " ", map { $_->{Name} } @extra_upstreams)."]";
+ my $combined = cmdoutput @cmd;
+ }
+
+
+ my $us_txt = "
+ make_commit_te
+
+ update_head
+ xxx check new orig version is reasonable;
+ xxx decorate new orig version to get new debian version;
+
+
sub cmd_downstream_rebase_launder_v0 () {
badusage "needs 1 argument, the baseline" unless @ARGV==1;
my ($base) = @ARGV;