[PATCH v4 21/24] test-lib: allow setting the index format version

[Thomas Gummerer <t.gummerer@gmail.com>]

When running the test suite, it should be possible to set the default
index format for the tests.  Do that by allowing the user to add a
TEST_GIT_INDEX_VERSION variable in config.mak setting the index version.

If it isn't set, the default version given in the source code is
used (currently version 3).

Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
---
 Makefile                | 7 +++++++
 t/test-lib-functions.sh | 5 +++++
 t/test-lib.sh           | 3 +++
 3 files changed, 15 insertions(+)

diff --git a/Makefile b/Makefile
index 6a1b054..8539548 100644
--- a/Makefile
+++ b/Makefile
@@ -342,6 +342,10 @@ all::
 # Define DEFAULT_HELP_FORMAT to "man", "info" or "html"
 # (defaults to "man") if you want to have a different default when
 # "git help" is called without a parameter specifying the format.
+#
+# Define TESTGIT_INDEX_FORMAT to 2, 3, 4 or 5 to run the test suite
+# with a different indexfile format.  If it isn't set the index file
+# format used is index-v[23].
 
 GIT-VERSION-FILE: FORCE
 	@$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -2218,6 +2222,9 @@ endif
 ifdef GIT_PERF_MAKE_OPTS
 	@echo GIT_PERF_MAKE_OPTS=\''$(subst ','\'',$(subst ','\'',$(GIT_PERF_MAKE_OPTS)))'\' >>$@
 endif
+ifdef TEST_GIT_INDEX_VERSION
+	@echo TEST_GIT_INDEX_VERSION='$(subst ','\'',$(subst ','\'',$(TEST_GIT_INDEX_VERSION)))' >>$@
+endif
 
 ### Detect Python interpreter path changes
 ifndef NO_PYTHON
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 2f79146..4034262 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -31,6 +31,11 @@ test_set_editor () {
 	export EDITOR
 }
 
+test_set_index_version () {
+    GIT_INDEX_VERSION="$1"
+    export GIT_INDEX_VERSION
+}
+
 test_decode_color () {
 	awk '
 		function name(n) {
diff --git a/t/test-lib.sh b/t/test-lib.sh
index b25249e..d9e810c 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -104,6 +104,9 @@ export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
 export EDITOR
 
+GIT_INDEX_VERSION="$TEST_GIT_INDEX_VERSION"
+export GIT_INDEX_VERSION
+
 # Add libc MALLOC and MALLOC_PERTURB test
 # only if we are not executing the test with valgrind
 if expr " $GIT_TEST_OPTS " : ".* --valgrind " >/dev/null ||
-- 
1.8.4.2