X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=git-debrebase;h=b61970ce2f57bbef33a8915334a12a73e0272d28;hp=5d3c7426da687046ae3dccabc134cab99f484458;hb=8bfc1691211b345c319eed386e0442e1f579726a;hpb=8b650aeb481a3a4cb71325b6b7255194589c7612

diff --git a/git-debrebase b/git-debrebase
index 5d3c7426..b61970ce 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -36,6 +36,18 @@ use Dpkg::Version;
 use File::FnMatch qw(:fnmatch);
 use File::Copy;
 
+our ($usage_message) = <<'END';
+usages:
+  git-debrebase [<options>] [--|-i <git rebase options...>]
+  git-debrebase [<options>] status
+  git-debrebase [<options>] prepush [--prose=...]
+  git-debrebase [<options>] quick|conclude
+  git-debrebase [<options>] new-upstream <new-version> [<details ...>]
+  git-debrebase [<options>] convert-from-gbp [<upstream-commitish>]
+  ...
+See git-debrebase(1), git-debrebase(5), dgit-maint-debrebase(7) (in dgit).
+END
+
 our ($opt_force, $opt_noop_ok, @opt_anchors);
 our ($opt_defaultcmd_interactive);
 
@@ -45,10 +57,16 @@ $|=1;
 
 sub badusage ($) {
     my ($m) = @_;
-    print STDERR "bad usage: $m\n";
+    print STDERR "$us: bad usage: $m\n";
     finish 8;
 }
 
+sub getoptions {
+    my $m = shift;
+    local $SIG{__WARN__}; # GetOptions calls `warn' to print messages
+    GetOptions @_ or badusage $m;
+}
+
 sub cfg ($;$) {
     my ($k, $optional) = @_;
     local $/ = "\0";
@@ -1518,7 +1536,8 @@ sub cmd_status () {
 
 sub cmd_stitch () {
     my $prose = 'stitch';
-    GetOptions('prose=s', \$prose) or badusage("bad options to stitch");
+    getoptions("bad options follow \`git-debrebase stitch'",
+	       'prose=s', \$prose);
     badusage "no arguments allowed" if @ARGV;
     do_stitch $prose, 0;
 }
@@ -1581,8 +1600,8 @@ sub make_patches ($) {
 
 sub cmd_make_patches () {
     my $opt_quiet_would_amend;
-    GetOptions('quiet-would-amend!', \$opt_quiet_would_amend)
-	or badusage("bad options to make-patches");
+    getoptions("bad options follow \`git-debrebase make-patches'",
+	       'quiet-would-amend!', \$opt_quiet_would_amend);
     badusage "no arguments allowed" if @ARGV;
     my $old_head = get_head();
     my $new = make_patches $old_head;
@@ -1604,19 +1623,30 @@ sub cmd_make_patches () {
 }
 
 sub cmd_convert_from_gbp () {
-    badusage "needs 1 optional argument, the upstream git rev"
+    badusage "want only 1 optional argument, the upstream git commitish"
 	unless @ARGV<=1;
+
+    my $clogp = parsechangelog();
+    my $version = $clogp->{'Version'}
+	// die "missing Version from changelog";
+
     my ($upstream_spec) = @ARGV;
-    $upstream_spec //= 'refs/heads/upstream';
-    my $upstream = git_rev_parse $upstream_spec;
+
+    my ($upstream, $upstream_version) =
+	resolve_upstream_version($upstream_spec, $version);
+
     my $old_head = get_head();
 
     my $upsdiff = get_differs $upstream, $old_head;
     if ($upsdiff & D_UPS) {
-	runcmd @git, qw(--no-pager diff),
+	runcmd @git, qw(--no-pager diff --stat),
 	    $upstream, $old_head,
 	    qw( -- :!/debian :/);
- fail "upstream ($upstream_spec) and HEAD are not identical in upstream files";
+	fail <<END;
+upstream ($upstream_spec) and HEAD are not
+identical in upstream files.  See diffstat above, or run
+  git diff $upstream_spec HEAD -- :!/debian :/
+END
     }
 
     if (!is_fast_fwd $upstream, $old_head) {
@@ -1791,7 +1821,8 @@ sub cmd_downstream_rebase_launder_v0 () {
     }
 }
 
-GetOptions("D+" => \$debuglevel,
+getoptions("bad options\n",
+	   "D+" => \$debuglevel,
 	   'noop-ok', => \$opt_noop_ok,
 	   'f=s' => \@snag_force_opts,
 	   'anchor=s' => \@opt_anchors,
@@ -1807,7 +1838,10 @@ GetOptions("D+" => \$debuglevel,
 	       # approach.  '-i=s{0,}' does not work with bundling.
 	       push @$opt_defaultcmd_interactive, @ARGV;
 	       @ARGV=();
-	   }) or badusage "bad options\n";
+	   },
+	   'help' => sub { print $usage_message or die $!; finish 0; },
+	   );
+
 initdebug('git-debrebase ');
 enabledebug if $debuglevel;