X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=git-debrebase;h=8c77dbccdcc1bc9c713983a30d33ba5cb2b730f4;hp=62fbc4d51acc4bf53ded1391c8cc906d34848d8f;hb=ece8834f77855aab622f427ffc858e05917ca77d;hpb=c0e4a8e072c2b133c5aa27a9636ce97521ad3ebf

diff --git a/git-debrebase b/git-debrebase
index 62fbc4d5..8c77dbcc 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
@@ -112,6 +116,9 @@ use Carp;
 use POSIX;
 use Data::Dumper;
 use Getopt::Long qw(:config posix_default gnu_compat bundling);
+use Dpkg::Version;
+
+our ($opt_force);
 
 sub badusage ($) {
     my ($m) = @_;
@@ -248,6 +255,17 @@ sub calculate_committer_authline () {
     return $&;
 }
 
+sub rm_subdir_cached ($) {
+    my ($subdir) = @_;
+    runcmd @git, qw(rm --quiet -rf --cached --ignore-unmatch), $subdir;
+}
+
+sub read_tree_subdir ($$) {
+    my ($subdir, $new_tree_object) = @_;
+    rm_subdir_cached $subdir;
+    runcmd @git, qw(read-tree), "--prefix=$subdir/", $new_tree_object;
+}
+
 # classify returns an info hash like this
 #   CommitId => $objid
 #   Hdr => # commit headers, including 1 final newline
@@ -325,7 +343,7 @@ sub classify ($) {
     my $t = $r->{Tree};
 
     foreach my $p (@p) {
-	$p->{Differs} => (get_differs $p->{CommitId}, $t),
+	$p->{Differs} = (get_differs $p->{CommitId}, $t),
     }
 
     printdebug "classify $objid \$t=$t \@p",
@@ -356,7 +374,7 @@ sub classify ($) {
 	} elsif ($d & (D_PAT_ADD|D_PAT_OTH)) {
 	    return $unknown->("edits debian/patches");
 	} elsif ($d & DS_DEB and !($d & ~DS_DEB)) {
-	    my ($ty,$dummy) = git_cat_file "$ph[0]:debian";
+	    my ($ty,$dummy) = git_cat_file "$p[0]{CommitId}:debian";
 	    if ($ty eq 'tree') {
 		if ($d == D_DEB_CLOG) {
 		    return $classify->(qw(Changelog));
@@ -443,9 +461,11 @@ sub classify ($) {
 	    return $classify->(qw(BreakwaterUpstreamMerge),
 			       OrigParents => [ $p[!$prevbrw] ]);
 	}
-	# xxx multi-.orig upstreams
     }
 
+    # multi-orig upstreams are represented with a breakwater merge
+    # from a single upstream commit which combines the orig tarballs
+
     return $unknown->("complex merge");
 }
 
@@ -453,7 +473,7 @@ sub walk ($;$$);
 sub walk ($;$$) {
     my ($input,
 	$nogenerate,$report) = @_;
-    # => ($tip, $breakwater_tip)
+    # => ($tip, $breakwater_tip, $last_upstream_merge_in_breakwater)
     # (or nothing, if $nogenerate)
 
     # go through commits backwards
@@ -509,6 +529,8 @@ sub walk ($;$$) {
 	no warnings qw(exiting); last;
     };
 
+    my $last_upstream_update;
+
     for (;;) {
 	$cl = classify $cur;
 	my $ty = $cl->{Type};
@@ -526,6 +548,7 @@ sub walk ($;$$) {
 	    $cur = $p0;
 	    next;
 	} elsif ($ty eq 'BreakwaterStart') {
+            $last_upstream_update = $cur;
 	    $build_start->('FirstPackaging', $cur);
 	} elsif ($ty eq 'Upstream') {
 	    push @upp_cl, $cl;
@@ -550,6 +573,7 @@ sub walk ($;$$) {
 	    $cur = $contrib;
 	    next;
 	} elsif ($ty eq 'BreakwaterUpstreamMerge') {
+            $last_upstream_update = $cur;
 	    $build_start->("PreviousBreakwater", $cur);
 	} elsif ($ty eq 'DgitImportUnpatched') {
 	    my $pm = $pseudomerges[-1];
@@ -603,6 +627,7 @@ sub walk ($;$$) {
 		$prline->(" Import");
 		$rewrite_from_here->();
 		$upp_limit //= $#upp_cl; # further, deeper, patches discarded
+                die 'BUG $upp_limit is not used anywhere?';
 		$cur = $ovwr;
 		next;
 	    } else {
@@ -629,14 +654,9 @@ sub walk ($;$$) {
 
     my $rewriting = 0;
 
-    my $rm_tree_cached = sub {
-	my ($subdir) = @_;
-	runcmd @git, qw(rm --quiet -rf --cached --ignore-unmatch), $subdir;
-    };
     my $read_tree_debian = sub {
 	my ($treeish) = @_;
-	$rm_tree_cached->(qw(debian));
-	runcmd @git, qw(read-tree --prefix=debian/), "$treeish:debian";
+	read_tree_subdir 'debian', "$treeish:debian";
     };
     my $read_tree_upstream = sub {
 	my ($treeish) = @_;
@@ -678,7 +698,7 @@ sub walk ($;$$) {
 		next;
 	    } elsif ($method eq 'DgitImportDebianUpdate') {
 		$read_tree_debian->($cltree);
-		$rm_tree_cached->(qw(debian/patches));
+		rm_subdir_cached qw(debian/patches);
 	    } elsif ($method eq 'DgitImportUpstreamUpdate') {
 		$read_tree_upstream->($cltree);
 		push @parents, map { $_->{CommitId} } @{ $cl->{OrigParents} };
@@ -713,6 +733,9 @@ sub walk ($;$$) {
 	    my $newcommit = cmdoutput @cmd;
 	    confess "$ch ?" unless $rewriting or $newcommit eq $cl->{CommitId};
 	    $build = $newcommit;
+            if (grep { $method eq $_ } qw(DgitImportUpstreamUpdate)) {
+                $last_upstream_update = $cur;
+            }
 	}
     };
 
@@ -720,7 +743,7 @@ sub walk ($;$$) {
     die sprintf "internal error %#x %s %s", $final_check, $build, $input
 	if $final_check & ~D_PAT_ADD;
 
-    return ($build, $breakwater);
+    return ($build, $breakwater, $last_upstream_update);
 }
 
 sub get_head () { return git_rev_parse qw(HEAD); }
@@ -761,6 +784,203 @@ sub cmd_analyse () {
     STDOUT->error and die $!;
 }
 
+sub cmd_new_upstream_v0 () {
+    # xxx would like to support more git-rebase options
+    badusage
+ "need NEW-VERSION UPS-COMMITISH [EXTRA-UPS-NAME EXTRA-UPS-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
+
+    my %pieces;
+
+    # parse args - low commitment
+    my $new_version = (new Dpkg::Version scalar(shift @ARGV), check => 1);
+    my $new_upstream_version = $new_version->version();
+
+    my $new_upstream = git_rev_parse shift @ARGV;
+
+    my $piece = sub {
+        my ($n, @x) = @_; # may be ''
+        my $pc = $pieces{$n} //= {
+    	    Name => $n,
+	    Desc => ($n ? "upstream piece $n" : "upstream (main piece"),
+	};
+	while (my $k = shift @x) { $pc->{$k} = shift @x; }
+    };
+
+    my @newpieces;
+    my $newpiece = sub {
+	my ($n, @x) = @_; # may be ''
+	my $pc = $piece->($n, @x, NewIx => (scalar @newpieces));
+	push @newpieces, $pc;
+    };
+
+    $newpiece->('',
+        OldIx => 0,
+        New => $new_upstream,
+    );
+    while (@ARGV) {
+	my $n = shift @ARGV;
+	my $c = git_rev_parse shift @ARGV;
+	die unless $n =~ m/^$extra_orig_namepart_re$/;
+	$newpiece->($n, New => $c);
+    }
+
+    # now we need to investigate the branch this generates the
+    # laundered version but we don't switch to it yet
+    my $old_head = get_head();
+    my ($old_laundered_tip,$old_bw,$old_upstream_update) = walk $old_head;
+
+    my $old_bw_cl = classify $old_bw;
+    my $old_upstream_update_cl = classify $old_upstream_update;
+    confess unless $old_upstream_update_cl->{OrigParents};
+    my $old_upstream = parsecommit
+        $old_upstream_update_cl->{OrigParents}[0]{CommitId};
+
+    my $problems = 0;
+    my $problem = sub {
+	my ($msg) = @_;
+	$problems++;
+	print STDERR "preflight check failed: $msg\n";
+    };
+
+    $piece->('', Old => $old_upstream);
+
+    if ($old_upstream->{Msg} =~ m{^\[git-debrebase }m) {
+	if ($old_upstream->{Msg} =~
+ m{^\[git-debrebase new-upstream combine \.((?: $extra_orig_namepart_re)+)\]}
+	   ) {
+	    my @oldpieces = ('', split / /, $1);
+	    my $parentix = -1 + scalar @{ $old_upstream->{Parents} };
+	    foreach my $i (0..$#oldpieces) {
+		my $n = $oldpieces[$i];
+		$piece->($n, Old => $old_upstream->{CommitId}.'^'.$parentix);
+	    }
+	} else {
+	    $problem->("previous upstream $old_upstream->{CommitId} is from".
+                 " git-debrebase but not a \`new-upstream combine' commit");
+	}
+    }
+
+    foreach my $pc (values %pieces) {
+	if (!$pc->{Old}) {
+	    $problem->("introducing upstream piece $pc->{Name}");
+	} elsif (!$pc->{New}) {
+	    $problem->("dropping upstream piece $pc->{Name}");
+	} elsif (!is_fast_fwd $pc->{Old}, $pc->{New}) {
+	    $problem->("not fast forward: $pc->{Name} $pc->{Old}..$pc->{New}");
+	}
+    }
+
+    if ($problems) {
+	if ($opt_force) {
+	    printf STDERR
+		"preflight check failures (%d) overriden by --force\n",
+		$problems;
+	} else {
+	    fail sprintf
+		"preflight check failures (%d) (you could --force)",
+		$problems;
+	}
+    }
+
+    my $new_bw;
+
+    fresh_workarea();
+    in_workarea sub {
+	my @upstream_merge_parents;
+
+	if (!$problems) {
+	    push @upstream_merge_parents, $old_upstream->{CommitId};
+	}
+
+	foreach my $pc (@newpieces) { # always has '' first
+	    if ($pc->{Name}) {
+		read_tree_subdir $pc->{Name}, $pc->{New};
+	    } else {
+		runcmd @git, qw(read-tree), $pc->{New};
+	    }
+	    push @upstream_merge_parents, $pc->{New};
+	}
+
+	# index now contains the new upstream
+
+	if (@newpieces > 1) {
+	    # need to make the upstream subtree merge commit
+	    my $us_tree = cmdoutput @git, qw(write-tree);
+	    my @cmd = (@git, qw(commit-tree), $us_tree);
+	    push @cmd, qw(-p), $_ foreach @upstream_merge_parents;
+	    push @cmd, qw(-m), "Combine upstreams for $new_upstream_version";
+	    push @cmd, qw(-m),
+		"[git-debrebase new-upstream combine . ".
+		(join " ", map { $_->{Name} } @newpieces[1..$#newpieces]).
+		 "]";
+	    $new_upstream = cmdoutput @cmd;
+	}
+
+	# $new_upstream is either the single upstream commit, or the
+	# combined commit we just made.  Either way it will be the
+	# "upstream" parent of the breakwater special merge.
+
+	read_tree_subdir 'debian', "$old_bw:debian";
+
+	# index now contains the breakwater merge contents
+
+	my $bw_tree = cmdoutput @git, qw(write_tree);
+	my @cmd = (@git, qw(commit-tree), $bw_tree);
+	push @cmd, qw(-p), $old_bw, qw(-p), $new_upstream;
+	push @cmd, qw(-m), "Update to upstream $new_upstream_version";
+	push @cmd, qw(-m),
+	    "[git-debrebase new-upstream breakwater $new_upstream_version]";
+	$new_bw = cmdoutput @git;
+
+	# Now we have to add a changelog stanza so the Debian version
+	# is right.
+
+	die if unlink "debian";
+	die unless $!==ENOTEMPTY;
+	unlink "debian/changelog" or die $!;
+	open CN, ">", "debian/changelog" or die $!;
+	my $oldclog = git_cat_file ":debian/changelog";
+	$oldclog =~ m/^($package_re) \(\S+\) / or
+	    fail "cannot parse old changelog to get package name";
+	my $p = $1;
+	print CN <<END, $oldclog or die $!;
+$p ($new_version) UNRELEASED; urgency=medium
+
+  * Update to new upstream version $new_upstream_version.
+
+ -- 
+
+END
+	close CN or die $!;
+	runcmd @git, qw(update-index --add --replace), 'debian/changelog';
+
+	# Now we have the final new breakwater branch in the index
+
+	$bw_tree = cmdoutput @git, qw(write_tree);
+	@cmd = (@git, qw(commit-tree), $bw_tree);
+	push @cmd, qw(-p), $new_bw;
+	push @cmd, qw(-m),
+	    "Update changelog for new upstream $new_upstream_version";
+	push @cmd, qw(-m),
+	    "[git-debrebase new-upstream changelog $new_upstream_version]";
+	$new_bw = cmdoutput @git;
+    };
+
+    # we have constructed the new breakwater. we now need to commit to
+    # the laundering output, because git-rebase can't easily be made
+    # to make a replay list which is based on some other branch
+
+    update_head $old_head, $old_laundered_tip, 'launder for new upstream';
+
+    my @cmd = (@git, qw(rebase --onto), $new_bw, $old_bw);
+    runcmd @cmd;
+    # now it's for the user to sort out
+}
+
 sub cmd_downstream_rebase_launder_v0 () {
     badusage "needs 1 argument, the baseline" unless @ARGV==1;
     my ($base) = @ARGV;
@@ -810,7 +1030,8 @@ sub cmd_downstream_rebase_launder_v0 () {
     }
 }
 
-GetOptions("D+" => \$debuglevel) or die badusage "bad options\n";
+GetOptions("D+" => \$debuglevel,
+	   'force!') or die badusage "bad options\n";
 initdebug('git-debrebase ');
 enabledebug if $debuglevel;