[PATCH 10/17] test-lib.sh: add --packv4 for running the tests with pack v4 as default

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

--packv4 also sets prerequisite PACKV4, which can be used to disable
v2-specific tests. You can run the test suite with

make test GIT_TEST_OPTS=--packv4

or just a specific test

./t5300-*.sh --packv4 -v -i

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/pack-objects.c |  4 ++++
 t/test-lib.sh          | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 8e2e5e9..1e0c2e6 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -2735,6 +2735,10 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 	if (!pack_compression_seen && core_compression_seen)
 		pack_compression_level = core_compression_level;
 
+	/* GIT_TEST_PACKV4 does not override --version */
+	if (getenv("GIT_TEST_PACKV4"))
+		pack_version = 4;
+
 	progress = isatty(2);
 	argc = parse_options(argc, argv, prefix, pack_objects_options,
 			     pack_usage, 0);
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 1aa27bd..931dd23 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -222,6 +222,9 @@ do
 	--statusprefix=*)
 		statusprefix=$(expr "z$1" : 'z[^=]*=\(.*\)')
 		shift ;;
+	--packv4)
+		packv4=t
+		shift ;;
 	*)
 		echo "error: unknown test option '$1'" >&2; exit 1 ;;
 	esac
@@ -740,6 +743,13 @@ else
 	mkdir -p "$TRASH_DIRECTORY"
 fi
 
+if test -n "$packv4"
+then
+	GIT_TEST_PACKV4=t
+	export GIT_TEST_PACKV4
+	test_set_prereq PACKV4
+fi
+
 # Gross hack to spawn N sub-instances of the tests in parallel, and
 # summarize the results.  Note that if this is enabled, the script
 # terminates at the end of this 'if' block.
-- 
1.8.2.83.gc99314b