Add support for riscv

Makefile

@@ -12,7 +12,8 @@ PYIGNORE ?= E128,E241,E402,E501,E722,W503,W504
 .PHONY: all check shellcheck flake8 pycheck unittest clean mantle mantle-check install
 
 MANTLE_BINARIES := ore kola plume
-KOLET_ARCHES := aarch64 ppc64le s390x x86_64
+# Typically just build kolet for the architecture we are on.
+export KOLET_ARCHES:=$(shell uname -m)
 
 all: bin/coreos-assembler mantle
 
@@ -26,9 +27,18 @@ cwd_checked:=$(patsubst ./%,.%.shellchecked,${cwd})
 GOARCH:=$(shell uname -m)
 export COSA_META_SCHEMA:=$(shell pwd)/src/v1.json
 ifeq ($(GOARCH),x86_64)
-        GOARCH="amd64"
+	GOARCH="amd64"
+	# On x86_64 only we'll build kolet for all the other architectures.
+	# This is mainly so we can initiate tests against a remote that is
+	# a different architecture. i.e. x86_64 kola testing against an
+	# aarch64 EC2 instance.
+	export KOLET_ARCHES := aarch64 ppc64le s390x x86_64
 else ifeq ($(GOARCH),aarch64)
-        GOARCH="arm64"
+	GOARCH="arm64"
+endif
+ifeq ($(GOARCH),riscv64)
+	# https://github.com/golang/go/issues/72840
+	export CGO_ENABLED := 0
 endif
 
 bin/coreos-assembler:

build.sh

@@ -30,6 +30,7 @@ set -x
 srcdir=$(pwd)
 
 configure_yum_repos() {
+    [ "${arch}" == "riscv64" ] && return # No continuous repo for riscv64 yet
     local version_id
     version_id=$(. /etc/os-release && echo ${VERSION_ID})
     # Add continuous tag for latest build tools and mark as required so we
@@ -102,6 +103,7 @@ install_rpms() {
 # and it is very useful to have in the same place/flow as where we do builds/tests related
 # to CoreOS.
 install_ocp_tools() {
+    [ "${arch}" == "riscv64" ] && return # No ocp tools for riscv64
     # If $OCP_VERSION is defined we'll grab that specific version.
     # Otherwise we'll get the latest.
     local url="https://mirror.openshift.com/pub/openshift-v4/${arch}/clients/ocp/latest${OCP_VERSION:+-$OCP_VERSION}/openshift-client-linux.tar.gz"

mantle/build

@@ -10,8 +10,9 @@ if [[ $# -eq 0 ]]; then
     set -- cmd/* schema
 fi
 
-declare -A BASEARCH_TO_GOARCH=([s390x]=s390x [x86_64]=amd64 [aarch64]=arm64 [ppc64le]=ppc64le)
-KOLET_ARCHES="${KOLET_ARCHES:-s390x x86_64 aarch64 ppc64le}"
+declare -A BASEARCH_TO_GOARCH=([x86_64]=amd64 [aarch64]=arm64 [ppc64le]=ppc64le [riscv64]=riscv64 [s390x]=s390x)
+ARCH=$(arch)
+KOLET_ARCHES="${KOLET_ARCHES:-${ARCH}}"
 
 race=
 if [ -n "${ENABLE_GO_RACE_DETECTOR:-}" ] && [[ ! "$(uname -m)" =~ "s390" ]]; then

src/cmd-osbuild

@@ -337,7 +337,7 @@ main() {
     fi
 
     case "$basearch" in
-        "x86_64"|"aarch64"|"s390x"|"ppc64le") ;;
+        "x86_64"|"aarch64"|"s390x"|"ppc64le"|"riscv64") ;;
         *) fatal "$basearch is not supported for this command" ;;
     esac