#!/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_K3S_CONTAINERD="github.com/k3s-io/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"

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 ${PKG_K8S_CLIENT}/version.gitVersion=${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_K3S_CONTAINERD}

    -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 ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Commit=${COMMIT}
    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.buildDate=${buildDate}
"
LDFLAGS="
    -w -s"

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

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

mkdir -p bin

if [ ${ARCH} = armv7l ] || [ ${ARCH} = arm ]; then
    export GOARCH="arm"
    export GOARM="7"
fi

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

rm -f \
    bin/k3s-agent \
    bin/k3s-server \
    bin/k3s-etcd-snapshot \
    bin/k3s-secrets-encrypt \
    bin/k3s-certificate \
    bin/kubectl \
    bin/crictl \
    bin/ctr \
    bin/containerd \
    bin/containerd-shim \
    bin/containerd-shim-runc-v2 \
    bin/runc

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

INSTALLBIN=$(pwd)/bin
if [ ! -x ${INSTALLBIN}/cni ]; then
(
    echo Building cni
    TMPDIR=$(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" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o $INSTALLBIN/cni
)
fi

echo Building k3s
CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/k3s ./cmd/server/main.go
ln -s k3s ./bin/k3s-agent
ln -s k3s ./bin/k3s-server
ln -s k3s ./bin/k3s-etcd-snapshot
ln -s k3s ./bin/k3s-secrets-encrypt
ln -s k3s ./bin/k3s-certificate
ln -s k3s ./bin/kubectl
ln -s k3s ./bin/crictl
ln -s k3s ./bin/ctr

export GOPATH=$(pwd)/build

echo Building containerd
pushd ./build/src/github.com/containerd/containerd
TAGS="${TAGS/netcgo/netgo}"
CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o bin/containerd              ./cmd/containerd
CGO_ENABLED=1 "${GO}" build -tags "$TAGS" -ldflags "$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_LDFLAGS="-w -s" BUILDTAGS="$RUNC_TAGS" $RUNC_STATIC
popd
cp -vf ./build/src/github.com/opencontainers/runc/runc ./bin/