#!/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.

if test "$CGIT_TEST_NO_GIT_VERSION" = "YesPlease"
then
	exit 0
fi

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

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
'

# 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 submodule pin to describe, so there is
# nothing to compare against and the test says so rather than failing.
test_expect_success 'test submodule version matches Makefile' '
	if ! test -e "$TEST_OUTPUT_DIRECTORY/../vendor/git/.git"
	then
		echo "vendor/git/ is not a Git repository" >&2
	else
		(
			cd "$TEST_OUTPUT_DIRECTORY/.." &&
			submodule_oid=$(git ls-files --stage -- vendor/git |
				sed -e "s/^[0-9]* \\([0-9a-f]*\\) [0-9][[:space:]].*$/\\1/") &&
			cd vendor/git &&
			git describe --match "v[0-9]*" $submodule_oid
		) | sed -e "s/^v//" -e "s/-/./" >submodule_version &&
		test_cmp submodule_version makefile_version
	fi
'

test_done