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From: "brian m. carlson" <>
To: <>
Cc: Derrick Stolee <>,
	Junio C Hamano <>
Subject: [PATCH v2 1/2] builtin/checkout: simplify metadata initialization
Date: Thu, 21 May 2020 02:07:11 +0000
Message-ID: <> (raw)
In-Reply-To: <>

When we call init_checkout_metadata in reset_tree, we want to pass the
object ID of the commit in question so that it can be passed to filters,
or if there is no commit, the tree.  We anticipated this latter case,
which can occur elsewhere in the checkout code, but it cannot occur
here.  The only case in which we do not have a commit object is when
invoking git switch with --orphan.  Moreover, we can only hit this code
path without a commit object additionally with either --force or

In such a case, there is no point initializing the checkout metadata
with a commit or tree because (a) there is no commit, only the empty
tree, and (b) we will never use the data, since no files will be smudged
when checking out a branch with no files.  Pass the all-zeros object ID
in this case, since we just need some value which is a valid pointer.

Signed-off-by: brian m. carlson <>
 builtin/checkout.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index e9d111bb83..62b5e371bc 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -621,9 +621,7 @@ static int reset_tree(struct tree *tree, const struct checkout_opts *o,
 	opts.src_index = &the_index;
 	opts.dst_index = &the_index;
 	init_checkout_metadata(&opts.meta, info->refname,
-			       info->commit ? &info->commit->object.oid :
-			       is_null_oid(&info->oid) ? &tree->object.oid :
-			       &info->oid,
+			       info->commit ? &info->commit->object.oid : &null_oid,
 	init_tree_desc(&tree_desc, tree->buffer, tree->size);

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 17:22 Git Test Coverage Report (v2.27.0-rc0) Derrick Stolee
2020-05-19 12:11 ` Derrick Stolee
2020-05-19 20:07   ` René Scharfe
2020-05-19 23:42   ` brian m. carlson
2020-05-20  1:38     ` brian m. carlson
2020-05-19 18:31 ` [PATCH] t4067: make rename detection test output raw diff Jonathan Tan
2020-05-19 19:00   ` Derrick Stolee
2020-05-20  1:41 ` [PATCH 1/1] builtin/checkout: simplify metadata initialization brian m. carlson
2020-05-20 15:17   ` Junio C Hamano
2020-05-20 22:37     ` brian m. carlson
2020-05-21  2:07 ` [PATCH v2 0/2] Improve Fix code coverage for checkout brian m. carlson
2020-05-21  2:07   ` brian m. carlson [this message]
2020-05-21 17:35     ` [PATCH v2 1/2] builtin/checkout: simplify metadata initialization Junio C Hamano
2020-05-23 12:22       ` brian m. carlson
2020-05-21  2:07   ` [PATCH v2 2/2] t2060: add a test for switch with --orphan and --discard-changes brian m. carlson
2020-05-21 12:38   ` [PATCH v2 0/2] Improve Fix code coverage for checkout Derrick Stolee

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