X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;ds=sidebyside;f=git-debrebase;h=5fcec5461a2e51143de9818b50ad09aa6e0516db;hb=2b440473af773ab13334f8b79537c7a3153e4e4f;hp=11a1896217e10ef51a1288d99c647904f3a5817d;hpb=e61834ee5d6dc6e38d946b75112dbed6982a8560;p=dgit.git

diff --git a/git-debrebase b/git-debrebase
index 11a18962..5fcec546 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -29,6 +29,7 @@
 #    git-debrebase [<options> --] [<git-rebase options...>]
 #    git-debrebase [<options>] analyse
 #    git-debrebase [<options>] launder         # prints breakwater tip etc.
+#    git-debrebase [<options>] stitch [--prose=<for commit message>]
 #    git-debrebase [<options>] downstream-rebase-launder-v0  # experimental
 #
 #    git-debrebase [<options>] gbp2debrebase-v0 \
@@ -87,21 +88,28 @@ use POSIX;
 use Data::Dumper;
 use Getopt::Long qw(:config posix_default gnu_compat bundling);
 use Dpkg::Version;
+use File::FnMatch qw(:fnmatch);
 
-our ($opt_force);
+our ($opt_force, $opt_noop_ok);
+
+our $us = qw(git-debrebase);
 
 sub badusage ($) {
     my ($m) = @_;
     die "bad usage: $m\n";
 }
 
-sub cfg ($) {
-    my ($k) = @_;
-    $/ = "\0";
+sub cfg ($;$) {
+    my ($k, $optional) = @_;
+    local $/ = "\0";
     my @cmd = qw(git config -z);
     push @cmd, qw(--get-all) if wantarray;
     push @cmd, $k;
-    my $out = cmdoutput @cmd;
+    my $out = cmdoutput_errok @cmd;
+    if (!defined $out) {
+	fail "missing required git config $k" unless $optional;
+	return ();
+    }
     return split /\0/, $out;
 }
 
@@ -252,27 +260,40 @@ sub make_commit ($$) {
     return cmdoutput @cmd;
 }
 
-our $fproblems;
+our @fproblem_force_opts;
+our $fproblems_forced;
+our $fproblems_tripped;
 sub fproblem ($$) {
     my ($tag,$msg) = @_;
-    $fproblems++;
-    print STDERR "git-debrebase: safety catch tripped: $msg\n";
+    if (grep { $_ eq $tag } @fproblem_force_opts) {
+	$fproblems_forced++;
+	print STDERR "git-debrebase: safety catch overridden (-f$tag): $msg\n";
+    } else {
+	$fproblems_tripped++;
+	print STDERR "git-debrebase: safety catch tripped (-f$tag): $msg\n";
+    }
 }
+
 sub fproblems_maybe_bail () {
-    if ($fproblems) {
+    if ($fproblems_forced) {
+	printf STDERR
+	    "%s: safety catch trips: %d overriden by individual -f options\n",
+	    $us, $fproblems_forced;
+    }
+    if ($fproblems_tripped) {
 	if ($opt_force) {
 	    printf STDERR
-		"safety catch trips (%d) overriden by --force\n",
-		$fproblems;
+		"%s: safety catch trips: %d overriden by global --force\n",
+		$us, $fproblems_tripped;
 	} else {
 	    fail sprintf
-		"safety catch trips (%d) (you could --force)",
-		$fproblems;
+  "%s: safety catch trips: %d blockers (you could -f<tag>, or --force)",
+		$us, $fproblems_tripped;
 	}
     }
 }
 sub any_fproblems () {
-    return !!$fproblems;
+    return $fproblems_forced || $fproblems_tripped;
 }
 
 # classify returns an info hash like this
@@ -775,7 +796,10 @@ sub walk ($;$$) {
     return @r
 }
 
-sub get_head () { return git_rev_parse qw(HEAD); }
+sub get_head () {
+    git_check_unmodified();
+    return git_rev_parse qw(HEAD);
+}
 
 sub update_head ($$$) {
     my ($old, $new, $mrest) = @_;
@@ -809,9 +833,14 @@ sub cmd_launder () {
 
 sub defaultcmd_rebase () {
     my $old = get_head();
+    my ($status, $message) = record_ffq_prev();
+    if ($status eq 'written' || $status eq 'exists') {
+    } else {
+	fproblem $status, "could not record ffq-prev: $message";
+	fproblems_maybe_bail();
+    }
     my ($tip,$breakwater) = walk $old;
     update_head_postlaunder $old, $tip, 'launder for rebase';
-    @ARGV = qw(-i) unless @ARGV; # make configurable
     runcmd @git, qw(rebase), @ARGV, $breakwater;
 }
 
@@ -822,14 +851,104 @@ sub cmd_analyse () {
     if (defined $old) {
 	$old = git_rev_parse $old;
     } else {
-	$old = get_head();
+	$old = git_rev_parse 'HEAD';
     }
     my ($dummy,$breakwater) = walk $old, 1,*STDOUT;
     STDOUT->error and die $!;
 }
 
+sub ffq_prev_branchinfo () {
+    # => ('status', "message", [$current, $ffq_prev])
+    # 'status' may be
+    #    branch         message is undef
+    #    weird-symref   } no $current,
+    #    notbranch      }  no $ffq_prev
+    my $current = git_get_symref();
+    return ('detached', 'detached HEAD') unless defined $current;
+    return ('weird-symref', 'HEAD symref is not to refs/')
+	unless $current =~ m{^refs/};
+    my $ffq_prev = "refs/$ffq_refprefix/$'";
+    return ('branch', undef, $current, $ffq_prev);
+}
+
+sub record_ffq_prev () {
+    # => ('status', "message")
+    # 'status' may be
+    #    written          message is undef
+    #    exists
+    #    detached
+    #    weird-symref
+    #    notbranch
+    # if not ff from some branch we should be ff from, is an fproblem
+    # if "written", will have printed something about that to stdout,
+    #   and also some messages about ff checks
+    my ($status, $message, $current, $ffq_prev) = ffq_prev_branchinfo();
+    return ($status, $message) unless $status eq 'branch';
+
+    my $currentval = get_head();
+
+    my $exists = git_get_ref $ffq_prev;
+    return ('exists',"$ffq_prev already exists") if $exists;
+
+    return ('not-branch', 'HEAD symref is not to refs/heads/')
+	unless $current =~ m{^refs/heads/};
+    my $branch = $';
+
+    my @check_specs = split /\;/, (cfg "branch.$branch.ffq-ffrefs",1) // '*';
+    my %checked;
+
+    my $check = sub {
+	my ($lrref, $desc) = @_;
+	my $invert;
+	for my $chk (@check_specs) {
+	    my $glob = $chk;
+	    $invert = $glob =~ s{^[^!]}{};
+	    last if fnmatch $glob, $lrref;
+	}
+	return if $invert;
+	my $lrval = git_get_ref $lrref;
+	return unless defined $lrval;
+
+	if (is_fast_fwd $lrval, $currentval) {
+	    print "OK, you are ahead of $lrref\n" or die $!;
+	    $checked{$lrref} = 1;
+	} if (is_fast_fwd $currentval, $lrval) {
+	    $checked{$lrref} = -1;
+	    fproblem 'behind', "you are behind $lrref, divergence risk";
+	} else {
+	    $checked{$lrref} = -1;
+	    fproblem 'diverged', "you have diverged from $lrref";
+	}
+    };
+
+    my $merge = cfg "branch.$branch.merge",1;
+    if (defined $merge && $merge =~ m{^refs/heads/}) {
+	my $rhs = $';
+	my $check_remote = sub {
+	    my ($remote, $desc) = (@_);
+	    return unless defined $remote;
+	    $check->("refs/remotes/$remote/$rhs", $desc);
+	};
+	$check_remote->((cfg "branch.$branch.remote",1),
+			'remote fetch/merge branch');
+	$check_remote->((cfg "branch.$branch.pushRemote",1) //
+			(cfg "branch.$branch.pushDefault",1),
+			'remote push branch');
+    }
+    if ($branch =~ m{^dgit/}) {
+	$check->("remotes/dgit/$branch", 'remote dgit branch');
+    } elsif ($branch =~ m{^master$}) {
+	$check->("remotes/dgit/dgit/sid", 'remote dgit branch for sid');
+    }
+
+    fproblems_maybe_bail();
+    runcmd @git, qw(update-ref -m), "record current head for preservation",
+	$ffq_prev, $currentval, $git_null_obj;
+    print "Recorded current head for preservation\n" or die $!;
+    return ('written', undef);
+}
+
 sub cmd_new_upstream_v0 () {
-    # 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
 
@@ -1007,6 +1126,41 @@ END
     # now it's for the user to sort out
 }
 
+sub cmd_record_ffq_prev () {
+    badusage "no arguments allowed" if @ARGV;
+    my ($status, $msg) = record_ffq_prev();
+    if ($status eq 'exists' && $opt_noop_ok) {
+	print "Previous head already recorded\n" or die $!;
+    } elsif ($status eq 'written') {
+    } else {
+	fail "Could not preserve: $msg";
+    }
+}
+
+sub cmd_stitch () {
+    my $prose = '';
+    GetOptions('prose=s', \$prose) or die badusage("bad options to stitch");
+    badusage "no arguments allowed" if @ARGV;
+    my ($status, $message, $current, $ffq_prev) = ffq_prev_branchinfo();
+    if ($status ne 'branch') {
+	fproblem $status, "could not check ffq-prev: $message";
+	fproblems_maybe_bail();
+    }
+    my $prev = $ffq_prev && git_get_ref $ffq_prev;
+    if (!$prev) {
+	fail "No ffq-prev to stitch." unless $opt_noop_ok;
+    }
+    $prose = ", $prose" if length $prose;
+    runcmd @git, qw(merge -s ours --no-edit -m), <<END;
+Declare fast forward / record previous work
+
+[git-debrebase pseudomerge: stitch$prose]
+END
+    # xxx should delete old ffq-prev
+    # xxx should avoid making pseudomerge if not needed
+    # xxx should make pseudomerge in temp tree so can do atomic update
+}
+
 sub cmd_gbp2debrebase () {
     badusage "needs 1 optional argument, the upstream" unless @ARGV<=1;
     my ($upstream_spec) = @ARGV;
@@ -1069,7 +1223,7 @@ sub cmd_gbp2debrebase () {
 	# rebase the patch queue onto the new breakwater
 	runcmd @git, qw(reset --quiet --hard patch-queue/gdr-internal);
 	runcmd @git, qw(rebase --quiet --onto), $work, qw(gdr-internal);
-	$work = get_head();
+	$work = git_rev_parse 'HEAD';
     };
 
     update_head_checkout $old_head, $work, 'gbp2debrebase';
@@ -1125,6 +1279,8 @@ sub cmd_downstream_rebase_launder_v0 () {
 }
 
 GetOptions("D+" => \$debuglevel,
+	   'noop-ok', => \$opt_noop_ok,
+	   'f=s' => \@fproblem_force_opts,
 	   'force!') or die badusage "bad options\n";
 initdebug('git-debrebase ');
 enabledebug if $debuglevel;