# Helper for generating the offline Bazel repository cache distfile.
#
# Usage:
#   make -f Makefile.bazel-cache
#
# WRKDIRPREFIX and DISTDIR are intentionally not set here.  The sub-make that
# reads the real port Makefile will pick them up from /etc/make.conf or from the
# command line, the same as any other port build.
#
# This intentionally excludes ${BAZEL_CACHE_DISTFILE} while preparing the source
# tree, otherwise generating a new cache would require the cache to already
# exist.

PORTDIR?=	${.CURDIR}
BATCH?=		yes

PORT_MAKE=	${MAKE} -C ${PORTDIR} \
		BATCH=${BATCH}

BAZEL!=			${PORT_MAKE} -V BAZEL
BAZEL_ARGS!=		${PORT_MAKE} -V BAZEL_ARGS
BAZEL_CACHE_DISTFILE!=	${PORT_MAKE} -V BAZEL_CACHE_DISTFILE
BAZEL_ENV!=		${PORT_MAKE} -V BAZEL_ENV
BAZEL_REPOSITORY_CACHE!=	${PORT_MAKE} -V BAZEL_REPOSITORY_CACHE
BAZEL_STARTUP_ARGS!=	${PORT_MAKE} -V BAZEL_STARTUP_ARGS
ALL_TARGET!=		${PORT_MAKE} -V ALL_TARGET
DISTFILES!=		${PORT_MAKE} -V DISTFILES
CACHE_DISTDIR!=		${PORT_MAKE} -V DISTDIR
ECHO_MSG!=		${PORT_MAKE} -V ECHO_MSG
FIND!=			${PORT_MAKE} -V FIND
GZIP_CMD!=		${PORT_MAKE} -V GZIP_CMD
LOCALBASE!=		${PORT_MAKE} -V LOCALBASE
LS!=			${PORT_MAKE} -V LS
MKDIR!=			${PORT_MAKE} -V MKDIR
RM!=			${PORT_MAKE} -V RM
SETENV!=		${PORT_MAKE} -V SETENV
SHA256!=		${PORT_MAKE} -V SHA256
SORT!=			${PORT_MAKE} -V SORT
TAR!=			${PORT_MAKE} -V TAR
WRKDIR!=		${PORT_MAKE} -V WRKDIR
WRKSRC!=		${PORT_MAKE} -V WRKSRC

.if !defined(BAZEL_CACHE_EPOCH)
BAZEL_CACHE_EPOCH!=	if [ -n "$${SOURCE_DATE_EPOCH}" ]; then \
				echo "$${SOURCE_DATE_EPOCH}"; \
			elif command -v git >/dev/null 2>&1 && git -C ${PORTDIR} rev-parse --show-toplevel >/dev/null 2>&1; then \
				git -C ${PORTDIR} log -1 --format=%ct -- .; \
			else \
				date -u +%s; \
			fi
.endif

JAVA_HOME?=		${LOCALBASE}/openjdk21
BAZEL_CACHE_ENV=	JAVA_HOME=${JAVA_HOME} ${BAZEL_ENV}
BAZEL_CACHE_ARGS=	${BAZEL_ARGS:N--repository_disable_download}
BAZEL_CACHE_ARGS+=	--repo_env=JAVA_HOME=${JAVA_HOME}
BAZEL_CACHE_DISTFILE_PATH=	${CACHE_DISTDIR}/${BAZEL_CACHE_DISTFILE}
BAZEL_CACHE_MANIFEST=	${WRKDIR}/bazel-cache-manifest
BAZEL_CACHE_OUTPUT_USER_ROOT=	${WRKDIR}/bazel-cache-output
BAZEL_CACHE_CHECK_ROOT=	${WRKDIR}/bazel-cache-check
BAZEL_CACHE_CHECK_REPOSITORY_CACHE=	${BAZEL_CACHE_CHECK_ROOT}/bazel-repository-cache
BAZEL_CACHE_CHECK_OUTPUT_USER_ROOT=	${BAZEL_CACHE_CHECK_ROOT}/bazel-output
BAZEL_CACHE_CHECK_ARGS=	${BAZEL_ARGS:N--repository_cache=*}
BAZEL_CACHE_CHECK_ARGS+=	--repository_cache=${BAZEL_CACHE_CHECK_REPOSITORY_CACHE}
BAZEL_CACHE_CHECK_ARGS+=	--repo_env=JAVA_HOME=${JAVA_HOME}
SOURCE_DISTFILES=	${DISTFILES:N*${BAZEL_CACHE_DISTFILE}*}

.PHONY: all bazel-cache-distfile package-bazel-cache-distfile check-bazel-cache-distfile clean-bazel-cache print-bazel-cache-vars

all: bazel-cache-distfile

bazel-cache-distfile:
	${PORT_MAKE} DISTFILES="${SOURCE_DISTFILES}" configure
	${RM} -r ${BAZEL_REPOSITORY_CACHE}
	${RM} -r ${BAZEL_CACHE_OUTPUT_USER_ROOT}
	${MKDIR} ${BAZEL_REPOSITORY_CACHE}
	cd ${WRKSRC} && ${SETENV} ${BAZEL_CACHE_ENV} ${BAZEL} ${BAZEL_STARTUP_ARGS} build --nobuild ${BAZEL_CACHE_ARGS} ${ALL_TARGET}
	${MAKE} -f ${.CURDIR}/Makefile.bazel-cache package-bazel-cache-distfile

package-bazel-cache-distfile:
	${MKDIR} ${CACHE_DISTDIR}
	${RM} ${BAZEL_CACHE_DISTFILE_PATH}
	cd ${WRKDIR} && ${FIND} ${BAZEL_REPOSITORY_CACHE:T} -print | LC_ALL=C ${SORT} > ${BAZEL_CACHE_MANIFEST}
	cd ${WRKDIR} && ${TAR} --no-recursion --format=pax --uid 0 --gid 0 --uname root --gname wheel --mtime @${BAZEL_CACHE_EPOCH} -cf - -T ${BAZEL_CACHE_MANIFEST} | ${GZIP_CMD} -c > ${BAZEL_CACHE_DISTFILE_PATH}
	${SHA256} ${BAZEL_CACHE_DISTFILE_PATH}
	${LS} -lh ${BAZEL_CACHE_DISTFILE_PATH}

check-bazel-cache-distfile:
	${RM} -r ${BAZEL_CACHE_CHECK_ROOT}
	${MKDIR} ${BAZEL_CACHE_CHECK_ROOT}
	cd ${BAZEL_CACHE_CHECK_ROOT} && ${TAR} -xzf ${BAZEL_CACHE_DISTFILE_PATH}
	cd ${WRKSRC} && ${SETENV} ${BAZEL_CACHE_ENV} ${BAZEL} ${BAZEL_STARTUP_ARGS} build --nobuild ${BAZEL_CACHE_CHECK_ARGS} ${ALL_TARGET}

clean-bazel-cache:
	${RM} -r ${BAZEL_REPOSITORY_CACHE}
	${RM} ${BAZEL_CACHE_DISTFILE_PATH}
	${RM} ${BAZEL_CACHE_MANIFEST}
	${RM} -r ${BAZEL_CACHE_OUTPUT_USER_ROOT}
	${RM} -r ${BAZEL_CACHE_CHECK_ROOT}

print-bazel-cache-vars:
	@${ECHO_MSG} "DISTDIR=${CACHE_DISTDIR}"
	@${ECHO_MSG} "WRKDIR=${WRKDIR}"
	@${ECHO_MSG} "WRKSRC=${WRKSRC}"
	@${ECHO_MSG} "BAZEL_CACHE_EPOCH=${BAZEL_CACHE_EPOCH}"
	@${ECHO_MSG} "JAVA_HOME=${JAVA_HOME}"
	@${ECHO_MSG} "BAZEL_REPOSITORY_CACHE=${BAZEL_REPOSITORY_CACHE}"
	@${ECHO_MSG} "BAZEL_CACHE_OUTPUT_USER_ROOT=${BAZEL_CACHE_OUTPUT_USER_ROOT}"
	@${ECHO_MSG} "BAZEL_CACHE_CHECK_REPOSITORY_CACHE=${BAZEL_CACHE_CHECK_REPOSITORY_CACHE}"
	@${ECHO_MSG} "BAZEL_CACHE_DISTFILE=${BAZEL_CACHE_DISTFILE}"
	@${ECHO_MSG} "SOURCE_DISTFILES=${SOURCE_DISTFILES}"