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-rw-r--r--builtin-checkout.c12
-rwxr-xr-xt/t2015-checkout-unborn.sh40
2 files changed, 43 insertions, 9 deletions
diff --git a/builtin-checkout.c b/builtin-checkout.c
index b8a4b0139b..140168cec4 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -402,7 +402,9 @@ static int merge_working_tree(struct checkout_opts *opts,
topts.dir = xcalloc(1, sizeof(*topts.dir));
topts.dir->flags |= DIR_SHOW_IGNORED;
topts.dir->exclude_per_dir = ".gitignore";
- tree = parse_tree_indirect(old->commit->object.sha1);
+ tree = parse_tree_indirect(old->commit ?
+ old->commit->object.sha1 :
+ (unsigned char *)EMPTY_TREE_SHA1_BIN);
init_tree_desc(&trees[0], tree->buffer, tree->size);
tree = parse_tree_indirect(new->commit->object.sha1);
init_tree_desc(&trees[1], tree->buffer, tree->size);
@@ -541,14 +543,6 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
parse_commit(new->commit);
}
- if (!old.commit && !opts->force) {
- if (!opts->quiet) {
- warning("You appear to be on a branch yet to be born.");
- warning("Forcing checkout of %s.", new->name);
- }
- opts->force = 1;
- }
-
ret = merge_working_tree(opts, &old, new);
if (ret)
return ret;
diff --git a/t/t2015-checkout-unborn.sh b/t/t2015-checkout-unborn.sh
new file mode 100755
index 0000000000..c551d39a66
--- /dev/null
+++ b/t/t2015-checkout-unborn.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+test_description='checkout from unborn branch protects contents'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ mkdir parent &&
+ (cd parent &&
+ git init &&
+ echo content >file &&
+ git add file &&
+ git commit -m base
+ ) &&
+ git fetch parent master:origin
+'
+
+test_expect_success 'checkout from unborn preserves untracked files' '
+ echo precious >expect &&
+ echo precious >file &&
+ test_must_fail git checkout -b new origin &&
+ test_cmp expect file
+'
+
+test_expect_success 'checkout from unborn preserves index contents' '
+ echo precious >expect &&
+ echo precious >file &&
+ git add file &&
+ test_must_fail git checkout -b new origin &&
+ test_cmp expect file &&
+ git show :file >file &&
+ test_cmp expect file
+'
+
+test_expect_success 'checkout from unborn merges identical index contents' '
+ echo content >file &&
+ git add file &&
+ git checkout -b new origin
+'
+
+test_done