From: brian m. carlson <sandals@crustytoothpaste.net>
Date: Wed, 2 May 2018 00:26:09 +0000 (+0000)
Subject: add--interactive: compute the empty tree value
X-Git-Tag: v2.18.0-rc0~17^2~1
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/23ec4c51d53f6976bdb54e92487d378f9abd1ed3?ds=inline;hp=--cc

add--interactive: compute the empty tree value

The interactive add script hard-codes the object ID of the empty tree.
To avoid any problems when changing hashes, compute this value when used
and cache it for any future uses.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

23ec4c51d53f6976bdb54e92487d378f9abd1ed3
diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index c1f52e457f..36f38ced90 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -205,8 +205,15 @@ sub list_untracked {
 	}
 }
 
-sub get_empty_tree {
-	return '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
+{
+	my $empty_tree;
+	sub get_empty_tree {
+		return $empty_tree if defined $empty_tree;
+
+		$empty_tree = run_cmd_pipe(qw(git hash-object -t tree /dev/null));
+		chomp $empty_tree;
+		return $empty_tree;
+	}
 }
 
 sub get_diff_reference {