release: add optional OCI images

This adds three OCI archive format files to the release containing
FreeBSD base images suitable for static linked, dynamic linked and shell
workloads. The shell image also contains pkg-bootstrap and can be easily
extended by installing packages (including pkgbase packages).

Reviewed by: dch, cpersiva, jlduran, zlei
Differential Revision: https://reviews.freebsd.org/D46759
MFC after: 2 days

1 files changed, 63 insertions, 0 deletions

diff --git a/release/scripts/make-oci-image.sh b/release/scripts/make-oci-image.sh
new file mode 100644
index 000000000000..a139a38d1930
--- /dev/null
+++ b/release/scripts/make-oci-image.sh
@@ -0,0 +1,63 @@
+#! /bin/sh
+
+# Build an Open Container Initiative (OCI) container image
+
+curdir=$1; shift
+rev=$1; shift
+branch=$1; shift
+arch=$1; shift
+image=$1; shift
+
+major=${rev%.*}
+minor=${rev#*.}
+
+abi=FreeBSD:${major}:${arch}
+
+echo "Building OCI freebsd${major}-${image} image for ${abi}"
+
+. ${curdir}/tools/oci-image-${image}.conf
+
+init_workdir() {
+	local abi=$1; shift
+	local workdir=$(mktemp -d -t oci-images)
+
+	mkdir ${workdir}/repos
+	cat > ${workdir}/repos/base.conf <<EOF
+FreeBSD-base: {
+  url: "file:///usr/obj/usr/src/repo/${abi}/latest"
+  signature_type: "none"
+  fingerprints: "none"
+}
+EOF
+	cp /etc/pkg/FreeBSD.conf ${workdir}/repos
+	echo ${workdir}
+}
+
+install_packages() {
+	local abi=$1; shift
+	local workdir=$1; shift
+	local rootdir=$1; shift
+	if [ ! -d ${rootdir}/usr/share/keys/pkg/trusted ]; then
+		mkdir -p ${rootdir}/usr/share/keys/pkg/trusted
+	fi
+	cp /usr/share/keys/pkg/trusted/* ${rootdir}/usr/share/keys/pkg/trusted
+	# We install the packages and then remove repository metadata (keeping the
+	# metadata for what was installed). This trims more than 40Mb from the
+	# resulting image.
+	env IGNORE_OSVERSION=yes ABI=${abi} pkg --rootdir ${rootdir} --repo-conf-dir ${workdir}/repos \
+		install -yq "$@" || exit $?
+	rm -rf ${rootdir}/var/db/pkg/repos
+}
+
+workdir=$(init_workdir ${abi})
+if [ -n "${OCI_BASE_IMAGE}" ]; then
+	base_image=freebsd${major}-${OCI_BASE_IMAGE}
+else
+	base_image=scratch
+fi
+
+c=$(buildah from ${base_image})
+m=$(buildah mount $c)
+oci_image_build
+buildah unmount $c
+buildah commit --rm $c freebsd${major}-${image}:latest