[PATCH 01/16] checkout: avoid resolving HEAD unnecessarily

[Eric Sunshine <sunshine@sunshineco.com>]

When --ignore-other-worktree is specified, we unconditionally skip the
check to see if the requested branch is already checked out in a linked
worktree. Since we know that we will be skipping that check, there is no
need to resolve HEAD in order to detect other conditions under which we
may skip the check.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
---
 builtin/checkout.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 5754554..75f90a9 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1145,13 +1145,13 @@ static int checkout_branch(struct checkout_opts *opts,
 		die(_("Cannot switch branch to a non-commit '%s'"),
 		    new->name);
 
-	if (new->path && !opts->force_detach && !opts->new_branch) {
+	if (new->path && !opts->force_detach && !opts->new_branch &&
+	    !opts->ignore_other_worktrees) {
 		unsigned char sha1[20];
 		int flag;
 		char *head_ref = resolve_refdup("HEAD", 0, sha1, &flag);
 		if (head_ref &&
-		    (!(flag & REF_ISSYMREF) || strcmp(head_ref, new->path)) &&
-		    !opts->ignore_other_worktrees)
+		    (!(flag & REF_ISSYMREF) || strcmp(head_ref, new->path)))
 			check_linked_checkouts(new);
 		free(head_ref);
 	}
-- 
2.5.0.rc1.201.ga12d9f8