#!/bin/sh

# Checks that the Git version cgit says it is built for is the one it is
# built against, so the Makefile, vendor/git and the submodule pin must name
# the same version. Set CGIT_TEST_NO_GIT_VERSION to YesPlease when Git comes
# from elsewhere.

test_description='Check Git version is correct'
CGIT_TEST_NO_CREATE_REPOS=YesPlease
. ./setup.sh

if test "$CGIT_TEST_NO_GIT_VERSION" = "YesPlease"
then
	skip_all='Skipping the Git version checks: CGIT_TEST_NO_GIT_VERSION is set'
	test_done
fi

test_expect_success 'extract Git version from Makefile' '
	sed -n -e "/^GIT_VERSION[[:space:]]*=/ {
		s/^GIT_VERSION[[:space:]]*=[[:space:]]*//
		p
	}" "$TEST_OUTPUT_DIRECTORY/../Makefile" >makefile_version &&
	test -s makefile_version
'

# Git's GIT-VERSION-GEN script applies "s/-/./g" to the version string on its
# way into the GIT-VERSION-FILE, so the same has to be done to the version in
# the Makefile before the two can be compared.
test_expect_success 'test Git version matches Makefile' '
	( cat "$TEST_OUTPUT_DIRECTORY/../vendor/git/GIT-VERSION-FILE" ||
		echo "No GIT-VERSION-FILE" ) |
	sed -e "s/GIT_VERSION[[:space:]]*=[[:space:]]*//" -e "s/\\.dirty$//" >git_version &&
	sed -e "s/-/./g" makefile_version >makefile_git_version &&
	test_cmp git_version makefile_git_version
'

# A tree unpacked from a tarball has no history to describe the submodule pin
# with, so the check is skipped there rather than passed.
test_lazy_prereq SUBMODULE 'test -e "$TEST_OUTPUT_DIRECTORY/../vendor/git/.git"'

test_expect_success SUBMODULE 'test submodule version matches Makefile' '
	git -C "$TEST_OUTPUT_DIRECTORY/.." ls-files --stage -- vendor/git >gitlink &&
	submodule_oid=$(sed -n "s/^160000 \\([0-9a-f]*\\) .*/\\1/p" gitlink) &&
	test -n "$submodule_oid" &&
	git -C "$TEST_OUTPUT_DIRECTORY/../vendor/git" \
		describe --match "v[0-9]*" "$submodule_oid" >submodule_tag &&
	sed -e "s/^v//" -e "s/-/./" submodule_tag >submodule_version &&
	test_cmp makefile_version submodule_version
'

test_done