From d9d77b27a18c939cb1ca280b2f18e15389ec88ff Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 1 Jul 2018 12:41:40 +0100
Subject: dgit: checkout: New command.

Closes:#878443.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 debian/changelog |  3 +++
 dgit             | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/debian/changelog b/debian/changelog
index a45d633..62fb2bc 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,5 +1,8 @@
 dgit (5.7~) unstable; urgency=medium
 
+  New feature:
+  * dgit checkout: new subcommand.  Closes:#878443.
+
   Bugfixes:
   * dgit update-vcs-git: Honour --package properly.
 
diff --git a/dgit b/dgit
index c7336dd..ca57375 100755
--- a/dgit
+++ b/dgit
@@ -4643,6 +4643,40 @@ END
     pull();
 }
 
+sub cmd_checkout {
+    parseopts();
+    package_from_d_control();
+    @ARGV==1 or badusage "dgit checkout needs a suite argument";
+    ($isuite) = @ARGV;
+    notpushing();
+
+    foreach my $canon (qw(0 1)) {
+	if (!$canon) {
+	    $csuite= $isuite;
+	} else {
+	    undef $csuite;
+	    canonicalise_suite();
+	}
+	if (length git_get_ref lref()) {
+	    # local branch already exists, yay
+	    last;
+	}
+	if (!length git_get_ref lrref()) {
+	    if (!$canon) {
+		# nope
+		next;
+	    }
+	    dofetch();
+	}
+	# now lrref exists
+	runcmd (@git, qw(update-ref), lref(), lrref(), '');
+	last;
+    }
+    local $ENV{GIT_REFLOG_ACTION} = git_reflog_action_msg
+        "dgit checkout $isuite";
+    runcmd (@git, qw(checkout), lref());
+}
+
 sub cmd_update_vcs_git () {
     my $specsuite;
     if (@ARGV==0 || $ARGV[0] =~ m/^-/) {
-- 
cgit v1.2.3