Add support for RISC-V

Signed-off-by: Antony Chazapis <[email protected]>

.drone.yml

@@ -406,6 +406,76 @@ volumes:
   host:
     path: /var/run/docker.sock
 
+---
+kind: pipeline
+name: riscv64
+
+platform:
+  os: linux
+  arch: amd64
+
+trigger:
+  event:
+    exclude:
+    - cron
+
+steps:
+- name: skipfiles
+  image: plugins/git
+  commands:
+  - export NAME=$(test $DRONE_BUILD_EVENT = pull_request && echo remotes/origin/${DRONE_COMMIT_BRANCH:-master} || echo ${DRONE_COMMIT_SHA}~)
+  - export DIFF=$(git --no-pager diff --name-only $NAME | grep -v -f .droneignore);
+  - if [ -z "$DIFF" ]; then
+        echo "All files in PR are on ignore list";
+        exit 78;
+    else
+        echo "Some files in PR are not ignored, $DIFF";
+    fi;
+  when:
+    event:
+    - pull_request
+
+- name: build
+  image: rancher/dapper:v0.5.0
+  secrets: [ AWS_SECRET_ACCESS_KEY-k3s-ci-uploader, AWS_ACCESS_KEY_ID-k3s-ci-uploader ]
+  environment:
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: AWS_SECRET_ACCESS_KEY-k3s-ci-uploader
+    AWS_ACCESS_KEY_ID:
+      from_secret: AWS_ACCESS_KEY_ID-k3s-ci-uploader
+  commands:
+  - ARCH=riscv64 SKIP_IMAGE=true SKIP_VALIDATE=true SKIP_AIRGAP=true dapper ci
+  - echo "${DRONE_TAG}-riscv64" | sed -e 's/+/-/g' >.tags
+  volumes:
+  - name: docker
+    path: /var/run/docker.sock
+
+- name: github_binary_release
+  image: plugins/github-release
+  settings:
+    api_key:
+      from_secret: github_token
+    prerelease: true
+    checksum:
+    - sha256
+    checksum_file: CHECKSUMsum-riscv64.txt
+    checksum_flatten: true
+    files:
+    - "dist/artifacts/*"
+  when:
+    instance:
+    - drone-publish.k3s.io
+    ref:
+    - refs/head/master
+    - refs/tags/*
+    event:
+    - tag
+
+volumes:
+- name: docker
+  host:
+    path: /var/run/docker.sock
+
 ---
 kind: pipeline
 name: validate_go_mods

Dockerfile.dapper

@@ -52,7 +52,7 @@ ENV SELINUX=${SELINUX}
 
 # Set Dapper configuration variables
 ENV DAPPER_RUN_ARGS="--privileged -v k3s-cache:/go/src/github.com/k3s-io/k3s/.cache -v trivy-cache:/root/.cache/trivy" \
-    DAPPER_ENV="REPO TAG DRONE_TAG IMAGE_NAME SKIP_VALIDATE SKIP_IMAGE SKIP_AIRGAP AWS_SECRET_ACCESS_KEY AWS_ACCESS_KEY_ID GITHUB_TOKEN GOLANG GOCOVER DEBUG" \
+    DAPPER_ENV="REPO TAG DRONE_TAG IMAGE_NAME ARCH SKIP_VALIDATE SKIP_IMAGE SKIP_AIRGAP AWS_SECRET_ACCESS_KEY AWS_ACCESS_KEY_ID GITHUB_TOKEN GOLANG GOCOVER DEBUG" \
     DAPPER_SOURCE="/go/src/github.com/k3s-io/k3s/" \
     DAPPER_OUTPUT="./bin ./dist ./build/out ./build/static ./pkg/static ./pkg/deploy" \
     DAPPER_DOCKER_SOCKET=true \

README.md

@@ -139,7 +139,7 @@ curl -sfL https://get.k3s.io | K3S_URL=https://myserver:6443 K3S_TOKEN=XXX sh -
 Manual Download
 ---------------
 
-1. Download `k3s` from latest [release](https://github.com/k3s-io/k3s/releases/latest), x86_64, armhf, arm64 and s390x are supported.
+1. Download `k3s` from latest [release](https://github.com/k3s-io/k3s/releases/latest), x86_64, armhf, arm64, s390x and riscv64 are supported.
 1. Run the server.
 
 ```bash

install.sh

@@ -315,6 +315,10 @@ setup_verify_arch() {
             ARCH=s390x
             SUFFIX=-${ARCH}
             ;;
+        riscv64)
+            ARCH=riscv64
+            SUFFIX=-${ARCH}
+            ;;
         aarch64)
             ARCH=arm64
             SUFFIX=-${ARCH}

scripts/binary_size_check.sh

@@ -22,6 +22,8 @@ elif [ ${ARCH} = arm ]; then
     BIN_SUFFIX="-armhf"
 elif [ ${ARCH} = s390x ]; then
     BIN_SUFFIX="-s390x"
+elif [ ${ARCH} = riscv64 ]; then
+    BIN_SUFFIX="-riscv64"
 fi
 
 CMD_NAME="dist/artifacts/k3s${BIN_SUFFIX}${BINARY_POSTFIX}"

scripts/build

@@ -100,6 +100,13 @@ if [ ${ARCH} = s390x ]; then
     export GOARCH="s390x"
 fi
 
+if [ ${ARCH} = riscv64 ]; then
+    export GOARCH="riscv64"
+    # These are needed as we are cross-compiling
+    export CC="riscv64-alpine-linux-musl-gcc"
+    export PKG_CONFIG_PATH=/home/builder/sysroot-riscv64/usr/lib/pkgconfig/
+fi
+
 k3s_binaries=(
     "bin/k3s-agent"
     "bin/k3s-server"

scripts/ci

@@ -6,6 +6,9 @@ pushd $SCRIPT_DIR
 
 ./download
 ./validate
+if [ ${ARCH} = riscv64 ]; then
+    ./prepare-cross
+fi
 ./build
 ./package
 

scripts/package-cli

@@ -67,11 +67,16 @@ elif [ ${ARCH} = arm ]; then
     BIN_SUFFIX="-armhf"
 elif [ ${ARCH} = s390x ]; then
     BIN_SUFFIX="-s390x"
+elif [ ${ARCH} = riscv64 ]; then
+    BIN_SUFFIX="-riscv64"
 fi
 
 CMD_NAME=dist/artifacts/k3s${BIN_SUFFIX}${BINARY_POSTFIX}
 
 GOOS=linux CC=gcc CXX=g++ "${GO}" generate
+if [ ${ARCH} = riscv64 ]; then
+    export GOARCH="riscv64"
+fi
 LDFLAGS="
     -X github.com/k3s-io/k3s/pkg/version.Version=$VERSION
     -X github.com/k3s-io/k3s/pkg/version.GitCommit=${COMMIT:0:8}

scripts/prepare-cross

@@ -0,0 +1,39 @@
+#/bin/bash
+
+# This script prepares a cross-compilation environment for $ARCH
+
+if [ -z "$ARCH" ]; then
+    echo "Error: ARCH not defined"
+    exit 1;
+fi
+
+if [ "$ARCH" != "riscv64" ]; then
+    echo "Error: Cross-compilation only available for riscv64"
+    exit 1;
+fi
+
+if [ "$ARCH" = "riscv64" ]; then
+    ALPINE_APK_REPO=https://dl-cdn.alpinelinux.org/alpine/edge/main
+fi
+
+# Build packages for cross-compiling (bootstrap.sh requires a non-root user)
+adduser -D builder
+addgroup builder abuild
+
+su builder -c "abuild-keygen -an"
+cp ~builder/.abuild/builder-*.rsa.pub /etc/apk/keys/
+
+ALPINE_VERSION=$(. /etc/os-release; echo $VERSION_ID | cut -f1,2 -d.)
+su builder -c "cd; git clone --single-branch --branch=$ALPINE_VERSION-stable --depth 1 https://github.com/alpinelinux/aports"
+sed -i "/Cross building base system/i exit 0\n" /home/builder/aports/scripts/bootstrap.sh
+apk update
+su builder -c "CBUILDROOT=~/sysroot-$ARCH ~/aports/scripts/bootstrap.sh $ARCH"
+
+# Install the cross-compiler in the host
+apk -X /home/builder/packages/main add gcc-$ARCH
+
+# Install headers and libraries in the gcc sysroot (upstream packages)
+apk -X $ALPINE_APK_REPO -U --allow-untrusted \
+    -p /home/builder/sysroot-$ARCH --arch $ARCH add \
+    musl musl-dev linux-headers libseccomp-dev libseccomp-static sqlite-dev sqlite-static zlib-static libgcc
+sed -i "s/^prefix=.*/prefix=\/home\/builder\/sysroot-$ARCH\/usr/g" /home/builder/sysroot-riscv64/usr/lib/pkgconfig/libseccomp.pc