Add build-containerd.sh to build containerd from existing repo

Signed-off-by: Lantao Liu <lantaol@google.com>

hack/install/install-containerd.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Copyright 2018 The containerd Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+source $(dirname "${BASH_SOURCE[0]}")/utils.sh
+CONTAINERD_DIR=${DESTDIR}/usr/local
+CONTAINERD_PKG=github.com/containerd/containerd
+
+# CHECKOUT_CONTAINERD indicates whether to checkout containerd repo.
+# This is useful for build containerd from existing repo, currently
+# used by containerd CI test.
+CHECKOUT_CONTAINERD=${CHECKOUT_CONTAINERD:-true}
+
+if ${CHECKOUT_CONTAINERD}; then
+  # Create a temporary GOPATH for containerd installation.
+  TMPGOPATH=$(mktemp -d /tmp/cri-install-containerd.XXXX)
+  GOPATH=${TMPGOPATH}
+  from-vendor CONTAINERD github.com/containerd/containerd
+  checkout_repo ${CONTAINERD_PKG} ${CONTAINERD_VERSION} ${CONTAINERD_REPO}
+fi
+
+# Install containerd
+cd ${GOPATH}/src/${CONTAINERD_PKG}
+make BUILDTAGS="${BUILDTAGS}"
+# containerd make install requires `go` to work. Explicitly
+# set PATH to make sure it can find `go` even with `sudo`.
+${SUDO} sh -c "PATH=${PATH} make install -e DESTDIR=${CONTAINERD_DIR}"
+
+# Clean the tmp GOPATH dir.
+if ${CHECKOUT_CONTAINERD}; then
+  rm -rf ${TMPGOPATH}
+fi