rootfs: Add support to create dockerfiles based on templates

To simplify maintaince, create dockerfiles based on templates.

This way when golang version is updated it will be done in one place
versions.txt.

This also allow to allways intall the same version of golang in any
dockerfile.

Signed-off-by: Jose Carlos Venegas Munoz <[email protected]>

rootfs-builder/.gitignore

@@ -0,0 +1 @@
+Dockerfile

rootfs-builder/centos/Dockerfile.in

@@ -0,0 +1,6 @@
+From centos:@OS_VERSION@
+
+RUN yum -y update && yum install -y git make gcc
+
+# This will install the proper golang to build Kata components
+@INSTALL_GO@

rootfs-builder/clearlinux/Dockerfile.in

@@ -0,0 +1,6 @@
+From fedora:27
+
+RUN dnf -y update && dnf install -y git systemd pkgconfig gcc
+
+# This will install the proper golang to build Kata components
+@INSTALL_GO@

rootfs-builder/euleros/Dockerfile.in

@@ -0,0 +1,5 @@
+FROM euleros:@OS_VERSION@
+
+RUN yum -y update && yum install -y yum git make gcc
+# This will install the proper golang to build Kata components
+@INSTALL_GO@

rootfs-builder/euleros/config.sh

@@ -6,7 +6,7 @@
 # Remove them or add more 
 
 # EulerOS Version
-OS_VERSION=${OS_VERSION:-2}
+OS_VERSION=${OS_VERSION:-2.2}
 
 #Mandatory Packages that must be installed
 # systemd: An init system that will start kata-agent

rootfs-builder/euleros/rootfs_lib.sh

@@ -27,8 +27,8 @@ logfile=/var/log/yum-euleros.log
 exactarch=1
 
 [Base]
-name=EulerOS-2.2 Base
-baseurl=http://developer.huawei.com/ict/site-euleros/euleros/repo/yum/2.2/os/x86_64/
+name=EulerOS-${OS_VERSION} Base
+baseurl=http://developer.huawei.com/ict/site-euleros/euleros/repo/yum/${OS_VERSION}/os/x86_64/
 enabled=1
 gpgcheck=1
 gpgkey=file://${CONFIG_DIR}/RPM-GPG-KEY-EulerOS

rootfs-builder/fedora/Dockerfile.in

@@ -0,0 +1,6 @@
+From fedora:@OS_VERSION@
+
+RUN dnf -y update && dnf install -y git redhat-release systemd pkgconfig gcc
+
+# This will install the proper golang to build Kata components
+@INSTALL_GO@

rootfs-builder/rootfs.sh

@@ -12,6 +12,9 @@ ROOTFS_DIR=${ROOTFS_DIR:-${PWD}/rootfs}
 AGENT_VERSION=${AGENT_VERSION:-master}
 GO_AGENT_PKG=${GO_AGENT_PKG:-github.com/kata-containers/agent}
 AGENT_BIN=${AGENT_BIN:-kata-agent}
+#Load default vesions for golang and other componets
+source "${script_dir}/versions.txt"
+
 # Name of file that will implement build_rootfs
 typeset -r LIB_SH="rootfs_lib.sh"
 
@@ -79,6 +82,29 @@ check_function_exist() {
 	[ "$(type -t ${function_name})" == "function" ] || die "${function_name} function was not defined"
 }
 
+generate_dockerfile() {
+	dir="$1"
+
+	readonly install_go="
+ADD https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz /tmp
+RUN tar -C /usr/ -xzf /tmp/go${GO_VERSION}.linux-amd64.tar.gz
+ENV GOROOT=/usr/go
+ENV PATH=\$PATH:\$GOROOT/bin:\$GOPATH/bin
+"
+
+	readonly dockerfile_template="Dockerfile.in"
+	[ -d "${dir}" ] || die "${dir}: not a directory"
+	pushd ${dir}
+	[ -f "${dockerfile_template}" ] || die "${dockerfile_template}: file not found"
+	set -x
+	sed \
+		-e "s|@OS_VERSION@|${OS_VERSION}|g" \
+		-e "s|@INSTALL_GO@|${install_go//$'\n'/\\n}|g" \
+		${dockerfile_template} > Dockerfile
+	set +x
+	popd
+}
+
 
 while getopts c:hr: opt
 do
@@ -110,6 +136,7 @@ check_function_exist "build_rootfs"
 if [ -n "${USE_DOCKER}" ] ; then
 	image_name="${distro}-rootfs-osbuilder"
 
+	generate_dockerfile "${distro_config_dir}"
 	docker build  \
 		--build-arg http_proxy="${http_proxy}" \
 		--build-arg https_proxy="${https_proxy}" \

rootfs-builder/template/Dockerfile.template

@@ -0,0 +1,11 @@
+#@distro@: docker image to be used to create a rootfs
+#@OS_VERSION@: Docker image version to build this dockerfile
+from @distro@:@OS_VERSION@
+
+# This dockerfile needs to provide all the componets need to build a rootfs
+# Install any package need to create a rootfs (package manager, extra tools)
+
+# RUN commands
+
+# This will install the proper golang to build Kata components
+@INSTALL_GO@

rootfs-builder/template/Makefile

@@ -13,3 +13,8 @@ endif
 	mkdir -p $(DESTDIR)
 	cp "$(MK_DIR)/rootfs_lib_template.sh" "$(DESTDIR)/rootfs_lib.sh"
 	cp "$(MK_DIR)/config_template.sh" "$(DESTDIR)/config.sh"
+	sed \
+		-e "s|@distro@|$(ROOTFS_BASE_NAME)|g" \
+		Dockerfile.template > $(DESTDIR)/Dockerfile.in
+
+

rootfs-builder/versions.txt

@@ -0,0 +1 @@
+GO_VERSION=1.9.2