#!/bin/bash
set -e -x

cd $(dirname $0)/..

. ./scripts/version.sh

GO=${GO-go}

PKG="github.com/k3s-io/k3s"
PKG_CONTAINERD="github.com/containerd/containerd"
PKG_CRICTL="github.com/kubernetes-sigs/cri-tools/pkg"
PKG_K8S_BASE="k8s.io/component-base"
PKG_K8S_CLIENT="k8s.io/client-go/pkg"
PKG_CNI_PLUGINS="github.com/containernetworking/plugins"
PKG_KUBE_ROUTER="github.com/cloudnativelabs/kube-router/v2"
PKG_CRI_DOCKERD="github.com/Mirantis/cri-dockerd"
PKG_ETCD="go.etcd.io/etcd"

buildDate=$(date -u '+%Y-%m-%dT%H:%M:%SZ')

VERSIONFLAGS="
    -X ${PKG}/pkg/version.Version=${VERSION}
    -X ${PKG}/pkg/version.GitCommit=${COMMIT:0:8}
    -X ${PKG}/pkg/version.UpstreamGolang=${VERSION_GOLANG}

    -X ${PKG_K8S_CLIENT}/version.gitVersion=${VERSION}
    -X ${PKG_K8S_CLIENT}/version.gitCommit=${COMMIT}
    -X ${PKG_K8S_CLIENT}/version.gitTreeState=${TREE_STATE}
    -X ${PKG_K8S_CLIENT}/version.buildDate=${buildDate}

    -X ${PKG_K8S_BASE}/version.gitVersion=${VERSION}
    -X ${PKG_K8S_BASE}/version.gitCommit=${COMMIT}
    -X ${PKG_K8S_BASE}/version.gitTreeState=${TREE_STATE}
    -X ${PKG_K8S_BASE}/version.buildDate=${buildDate}

    -X ${PKG_CRICTL}/version.Version=${VERSION_CRICTL}

    -X ${PKG_CONTAINERD}/version.Version=${VERSION_CONTAINERD}
    -X ${PKG_CONTAINERD}/version.Package=${PKG_CONTAINERD_K3S}

    -X ${PKG_CNI_PLUGINS}/pkg/utils/buildversion.BuildVersion=${VERSION_CNIPLUGINS}
    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Program=flannel
    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Version=${VERSION_FLANNEL}
    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Commit=HEAD
    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.buildDate=${buildDate}

    -X ${PKG_KUBE_ROUTER}/pkg/version.Version=${VERSION_KUBE_ROUTER}
    -X ${PKG_KUBE_ROUTER}/pkg/version.BuildDate=${buildDate}

    -X ${PKG_CRI_DOCKERD}/cmd/version.Version=${VERSION_CRI_DOCKERD}
    -X ${PKG_CRI_DOCKERD}/cmd/version.GitCommit=HEAD
    -X ${PKG_CRI_DOCKERD}/cmd/version.BuildTime=${buildDate}

    -X ${PKG_ETCD}/api/version.GitSHA=HEAD
"
if [ -n "${DEBUG}" ]; then
  GCFLAGS="-N -l"
else
  LDFLAGS="-w -s"
fi

STATIC="
    -extldflags '-static -lm -ldl -lz -lpthread'
"
TAGS="ctrd apparmor seccomp netcgo osusergo providerless urfave_cli_no_docs"
RUNC_TAGS="apparmor seccomp"
RUNC_STATIC="static"

if [ ${OS} = windows ]; then
    TAGS="ctrd netcgo osusergo providerless"
fi

if [ "$SELINUX" = "true" ]; then
    TAGS="$TAGS selinux"
    RUNC_TAGS="$RUNC_TAGS selinux"
fi

if [ "$STATIC_BUILD" != "true" ]; then
    STATIC="
"
    RUNC_STATIC=""
else
    TAGS="static_build libsqlite3 $TAGS"
fi

if [ -n "${GOCOVER}" ]; then
    BLDFLAGS="-cover"
    TAGS="cover $TAGS"
fi

mkdir -p bin

if [ ${ARCH} = armv7l ] || [ ${ARCH} = arm ]; then
    export GOARCH="arm"
    export GOARM="7"
    # Context: https://github.com/golang/go/issues/58425#issuecomment-1426415912
    export GOEXPERIMENT=nounified
fi

if [ ${ARCH} = s390x ]; then
    export GOARCH="s390x"
fi

k3s_binaries=(
    "bin/k3s-agent"
    "bin/k3s-server"
    "bin/k3s-token"
    "bin/k3s-etcd-snapshot"
    "bin/k3s-secrets-encrypt"
    "bin/k3s-certificate"
    "bin/k3s-completion"
    "bin/kubectl"
    "bin/containerd"
    "bin/crictl"
    "bin/ctr"
)

containerd_binaries=(
    "bin/containerd-shim"
    "bin/containerd-shim-runc-v2"
    "bin/runc"
    "bin/containerd-shim-runhcs-v1"
    "bin/runhcs"
)

for i in "${k3s_binaries[@]}"; do
    if [ -f "$i${BINARY_POSTFIX}" ]; then
        echo "Removing $i${BINARY_POSTFIX}"
        rm -f "$i${BINARY_POSTFIX}"
    fi
done

for i in "${containerd_binaries[@]}"; do
    if [ -f "$i${BINARY_POSTFIX}" ]; then
        echo "Removing $i${BINARY_POSTFIX}"
        rm -f "$i${BINARY_POSTFIX}"
    fi
done

cleanup() {
    exit_status=$?
    rm -rf $TMPDIR
    exit ${exit_status}
}

INSTALLBIN=$(pwd)/bin
if [ ! -x ${INSTALLBIN}/cni${BINARY_POSTFIX} ]; then
(
    echo Building cni
    TMPDIR=$(mktemp -d)
    trap cleanup EXIT
    WORKDIR=$TMPDIR/src/github.com/containernetworking/plugins
    git clone -b $VERSION_CNIPLUGINS https://github.com/rancher/plugins.git $WORKDIR
    cd $WORKDIR
    GO111MODULE=off GOPATH=$TMPDIR CGO_ENABLED=0 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o $INSTALLBIN/cni${BINARY_POSTFIX}
)
fi

echo Building k3s
CGO_ENABLED=1 "${GO}" build $BLDFLAGS -tags "$TAGS" -buildvcs=false -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/k3s${BINARY_POSTFIX} ./cmd/server

for i in "${k3s_binaries[@]}"; do
    ln -s "k3s${BINARY_POSTFIX}" "$i${BINARY_POSTFIX}"
done

export GOPATH=$(pwd)/build

case ${OS} in
  linux)
    echo Building containerd-shim
    pushd ./build/src/github.com/containerd/containerd
    TAGS="${TAGS/netcgo/netgo}"
    CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd-shim-runc-v2 ./cmd/containerd-shim-runc-v2
    popd
    cp -vf ./build/src/github.com/containerd/containerd/bin/* ./bin/

    echo Building runc
    pushd ./build/src/github.com/opencontainers/runc
    rm -f runc
    make EXTRA_FLAGS="-gcflags=\"all=${GCFLAGS}\"" EXTRA_LDFLAGS="$LDFLAGS" BUILDTAGS="$RUNC_TAGS" $RUNC_STATIC
    popd
    cp -vf ./build/src/github.com/opencontainers/runc/runc ./bin/
    ;;
  windows)
    echo Building containerd-shim-runhcs-v1
    pushd ./build/src/github.com/microsoft/hcsshim
    TAGS="${TAGS/netcgo/netgo}"
    CGO_ENABLED=0 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd-shim-runhcs-v1${BINARY_POSTFIX} ./cmd/containerd-shim-runhcs-v1
    CGO_ENABLED=0 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/runhcs${BINARY_POSTFIX} ./cmd/runhcs
    popd
    cp -vf ./build/src/github.com/microsoft/hcsshim/bin/*${BINARY_POSTFIX} ./bin/
    ;;
  *)
    echo "[ERROR] unrecognized opertaing system: ${OS}"
    exit 1
    ;;
esac