Sync with Git 2.30.2 for CVE-2021-21300

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/t/t2006-checkout-index-basic.sh b/t/t2006-checkout-index-basic.sh
index 7ff3edab05..7705e3a317 100755
--- a/t/t2006-checkout-index-basic.sh
+++ b/t/t2006-checkout-index-basic.sh
@@ -31,6 +31,51 @@ test_expect_success 'checkout-index reports errors (stdin)' '
 	test_must_fail git checkout-index --stdin 2>stderr &&
 	test_i18ngrep not.in.the.cache stderr
 '
+for mode in 'case' 'utf-8'
+do
+	case "$mode" in
+	case)	dir='A' symlink='a' mode_prereq='CASE_INSENSITIVE_FS' ;;
+	utf-8)
+		dir=$(printf "\141\314\210") symlink=$(printf "\303\244")
+		mode_prereq='UTF8_NFD_TO_NFC' ;;
+	esac
+
+	test_expect_success SYMLINKS,$mode_prereq \
+	"checkout-index with $mode-collision don't write to the wrong place" '
+		git init $mode-collision &&
+		(
+			cd $mode-collision &&
+			mkdir target-dir &&
+
+			empty_obj_hex=$(git hash-object -w --stdin </dev/null) &&
+			symlink_hex=$(printf "%s" "$PWD/target-dir" | git hash-object -w --stdin) &&
+
+			cat >objs <<-EOF &&
+			100644 blob ${empty_obj_hex}	${dir}/x
+			100644 blob ${empty_obj_hex}	${dir}/y
+			100644 blob ${empty_obj_hex}	${dir}/z
+			120000 blob ${symlink_hex}	${symlink}
+			EOF
+
+			git update-index --index-info <objs &&
+
+			# Note: the order is important here to exercise the
+			# case where the file at ${dir} has its type changed by
+			# the time Git tries to check out ${dir}/z.
+			#
+			# Also, we use core.precomposeUnicode=false because we
+			# want Git to treat the UTF-8 paths transparently on
+			# Mac OS, matching what is in the index.
+			#
+			git -c core.precomposeUnicode=false checkout-index -f \
+				${dir}/x ${dir}/y ${symlink} ${dir}/z &&
+
+			# Should not create ${dir}/z at ${symlink}/z
+			test_path_is_missing target-dir/z
+
+		)
+	'
+done
 
 test_expect_success 'checkout-index --temp correctly reports error on missing blobs' '
 	test_when_finished git reset --hard &&