--- /dev/null
+#!/bin/bash
+
+# Create application containers from OCI images
+
+# Copyright © 2014 Stéphane Graber <stgraber@ubuntu.com>
+# Copyright © 2017 Serge Hallyn <serge@hallyn.com>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
+# USA
+
+set -eu
+# set -x # debug
+
+# Make sure the usual locations are in PATH
+export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
+
+# Check for required binaries
+for bin in skopeo umoci jq; do
+ if ! type $bin >/dev/null 2>&1; then
+ echo "ERROR: Missing required tool: $bin" 1>&2
+ exit 1
+ fi
+done
+
+# Some useful functions
+cleanup() {
+ if [ -d "$DOWNLOAD_TEMP" ]; then
+ rm -Rf $DOWNLOAD_TEMP
+ fi
+}
+
+in_userns() {
+ [ -e /proc/self/uid_map ] || { echo no; return; }
+ while read line; do
+ fields=$(echo $line | awk '{ print $1 " " $2 " " $3 }')
+ [ "$fields" = "0 0 4294967295" ] && { echo no; return; } || true
+ echo $fields | grep -q " 0 1$" && { echo userns-root; return; } || true
+ done < /proc/self/uid_map
+
+ [ "$(cat /proc/self/uid_map)" = "$(cat /proc/1/uid_map)" ] && \
+ { echo userns-root; return; }
+ echo yes
+}
+
+# get entrypoint from oci image. Use sh if unspecified
+# TODO - we can get other things like resource limits here
+getep() {
+ basedir="$1"
+ q="$2"
+
+
+ digest=`cat "${basedir}/index.json" | jq --arg q "$q" '.manifests[] | if .annotations."org.opencontainers.image.ref.name" == $q then .digest else null end' | sed -e 's/"//g'`
+ if [ -z "${digest}" ]; then
+ echo "$q not found in index.json" >&2
+ echo "/bin/sh"
+ return
+ fi
+
+ # Ok we have the image config digest, now get the config from that,
+ d=${digest:7}
+ cdigest=`cat "${basedir}/blobs/sha256/${d}" | jq '.config.digest' | sed -e 's/"//g'`
+ if [ -z "${cdigest}" ]; then
+ echo "container config not found" >&2
+ echo "/bin/sh"
+ return
+ fi
+
+ d2=${cdigest:7}
+ ep=`cat "${basedir}/blobs/sha256/${d2}" | jq -c '.config.Entrypoint' | sed -e 's/^\[//; s/\]$//; s/","/" "/'`
+ cmd=`cat "${basedir}/blobs/sha256/${d2}" | jq -c '.config.Cmd' | sed -e 's/^\[//; s/\]$//; s/","/" "/'`
+ if [ "${ep}" = "null" ]; then
+ ep="${cmd}"
+ if [ "${ep}" = "null" ]; then
+ ep="/bin/sh"
+ fi
+ elif [ "${cmd}" != "null" ]; then
+ ep="${ep} ${cmd}"
+ fi
+
+ if [ -z "${ep}" ]; then
+ echo "/bin/sh"
+ return
+ fi
+ echo "${ep}"
+ return
+}
+
+usage() {
+ cat <<EOF
+LXC container template for OCI images
+
+Special arguments:
+[ -h | --help ]: Print this help message and exit.
+
+Required arguments:
+[ -u | --url <url> ]: The OCI image URL
+
+LXC internal arguments (do not pass manually!):
+[ --name <name> ]: The container name
+[ --path <path> ]: The path to the container
+[ --rootfs <rootfs> ]: The path to the container's rootfs
+[ --mapped-uid <map> ]: A uid map (user namespaces)
+[ --mapped-gid <map> ]: A gid map (user namespaces)
+
+EOF
+ return 0
+}
+
+options=$(getopt -o u:h -l help,name:,path:,\
+rootfs:,mapped-uid:,mapped-gid: -- "$@")
+
+if [ $? -ne 0 ]; then
+ usage
+ exit 1
+fi
+eval set -- "$options"
+
+OCI_URL=""
+LXC_MAPPED_GID=
+LXC_MAPPED_UID=
+LXC_NAME=
+LXC_PATH=
+LXC_ROOTFS=
+
+while :; do
+ case "$1" in
+ -h|--help) usage && exit 1;;
+ -u|--url) OCI_URL=$2; shift 2;;
+ --name) LXC_NAME=$2; shift 2;;
+ --path) LXC_PATH=$2; shift 2;;
+ --rootfs) LXC_ROOTFS=$2; shift 2;;
+ --mapped-uid) LXC_MAPPED_UID=$2; shift 2;;
+ --mapped-gid) LXC_MAPPED_GID=$2; shift 2;;
+ *) break;;
+ esac
+done
+
+# Check that we have all variables we need
+if [ -z "$LXC_NAME" ] || [ -z "$LXC_PATH" ] || [ -z "$LXC_ROOTFS" ]; then
+ echo "ERROR: Not running through LXC." 1>&2
+ exit 1
+fi
+
+if [ -z "$OCI_URL" ]; then
+ echo "ERROR: no OCI URL given"
+ exit 1
+fi
+
+USERNS=$(in_userns)
+
+if [ "$USERNS" != "no" ]; then
+ if [ "$USERNS" = "yes" ]; then
+ if [ -z "$LXC_MAPPED_UID" ] || [ "$LXC_MAPPED_UID" = "-1" ]; then
+ echo "ERROR: In a user namespace without a map." 1>&2
+ exit 1
+ fi
+ DOWNLOAD_MODE="user"
+ DOWNLOAD_TARGET="user"
+ else
+ DOWNLOAD_MODE="user"
+ DOWNLOAD_TARGET="system"
+ fi
+fi
+
+# Trap all exit signals
+trap cleanup EXIT HUP INT TERM
+
+if ! type mktemp >/dev/null 2>&1; then
+ DOWNLOAD_TEMP=/tmp/lxc-oci.$$
+ mkdir -p $DOWNLOAD_TEMP
+else
+ DOWNLOAD_TEMP=$(mktemp -d)
+fi
+
+# Download the image - TODO - cache
+skopeo copy "${OCI_URL}" "oci:${DOWNLOAD_TEMP}:latest"
+
+# Unpack the rootfs
+echo "Unpacking the rootfs"
+
+umoci unpack --image "${DOWNLOAD_TEMP}:latest" "${LXC_ROOTFS}.tmp"
+rmdir "${LXC_ROOTFS}"
+mv "${LXC_ROOTFS}.tmp/rootfs" "${LXC_ROOTFS}"
+entrypoint=$(getep ${DOWNLOAD_TEMP} latest)
+rm -rf "${LXC_ROOTFS}.tmp"
+
+LXC_CONF_FILE="${LXC_PATH}/config"
+echo "lxc.execute.cmd = ${entrypoint}" >> "${LXC_CONF_FILE}"
+echo "lxc.mount.auto = proc:mixed sys:mixed cgroup:mixed" >> "${LXC_CONF_FILE}"
+
+echo "lxc.uts.name = ${LXC_NAME}" >> ${LXC_PATH}/config
+
+if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ]; then
+ chown $LXC_MAPPED_UID $LXC_PATH/config $LXC_PATH/fstab >/dev/null 2>&1 || true
+fi
+if [ -n "$LXC_MAPPED_GID" ] && [ "$LXC_MAPPED_GID" != "-1" ]; then
+ chgrp $LXC_MAPPED_GID $LXC_PATH/config $LXC_PATH/fstab >/dev/null 2>&1 || true
+fi
+
+exit 0
projects / thirdparty / lxc.git / commitdiff
