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Diffstat (limited to 'ansible/docker/create_docker_chroot.sh')
| -rwxr-xr-x | ansible/docker/create_docker_chroot.sh | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/ansible/docker/create_docker_chroot.sh b/ansible/docker/create_docker_chroot.sh new file mode 100755 index 00000000..f8e256da --- /dev/null +++ b/ansible/docker/create_docker_chroot.sh @@ -0,0 +1,220 @@ +#!/bin/sh + +# COPYRIGHT NOTICE STARTS HERE + +# Copyright 2018 © Samsung Electronics Co., Ltd. +# +# 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. + +# COPYRIGHT NOTICE ENDS HERE + + +set -e + +CMD=$(basename "$0") + +help() +{ + echo " +NAME: + ${CMD} - create a chroot directory from docker image + +DESCRIPTION: + It will export docker image into a directory capable of chrooting. + It needs and will run these commands (requires docker service): + docker create + docker export + +USAGE: + ${CMD} [-h|--help|help] + This help + + ${CMD} convert <docker-name> <name-of-directory> + + It will convert docker image into directory - no chroot yet. + The name of the docker image must be imported already (not a file): + docker image ls + + The directory will be created and so this command will fail if some + directory or a file of this name (filepath) already exists! + There is another script run_chroot.sh with which you can do chroot + on this newly created directory - so it is expected that this + directory is kept clean and as it is. + If you don't care about this feature (run_chroot.sh) and you know + what are you doing, then do necessary mounts and execute: + chroot <name-of-directory>/chroot /bin/sh -l +" +} + +# +# PLEASE DON'T TOUCH ME +# + +# readme file for run_chroot.sh +readme() +{ + md_codequote='```' + +cat > "$CHROOT_METADIR"/README.md <<EOF +# RUN CHROOT COMMAND + +# usage: + +${md_codequote} +run_chroot.sh help +${md_codequote} + +**Don't modify insides of this directory (where this README.md lies).** + +The structure is needed as it is. + +If you wish to just run chroot by yourself, you can do: +${md_codequote} +chroot ./chroot /bin/sh -l +${md_codequote} + +# requirements: + +* root privileges +* docker service + +# directory structure: +${md_codequote} + README.md + chroot/ + .overlay + .workdir + .merged +${md_codequote} +EOF +} + +# arg: <docker-name> +check_docker_image() +{ + image="$1" + match=$(docker image ls --no-trunc -q "$image" | wc -l) + + case $match in + 0) + echo ERROR: "Docker image does not exist: ${DOCKER_IMAGE}" >&2 + exit 1 + ;; + 1) + : + ;; + *) + echo ERROR: "Multiple results for this docker name: ${DOCKER_IMAGE}" >&2 + exit 1 + ;; + esac + + return 0 +} + +cleanup() +{ + if [ -n "$DOCKER_CONTAINER" ] ; then + echo INFO: "Delete the export container: ${DOCKER_CONTAINER}" >&2 + if ! docker rm "$DOCKER_CONTAINER" > /dev/null ; then + echo ERROR: "Failed to delete: ${DOCKER_CONTAINER}" >&2 + fi + fi +} + +on_exit() +{ + set +e + cleanup +} + +action=nil +case "$1" in + ''|-h|--help|help) + help + exit 0 + ;; + convert) + action=convert + DOCKER_IMAGE="$2" + CHROOT_METADIR="$3" + ;; + *) + echo ERROR: "Bad usage" >&2 + help >&2 + exit 1 + ;; +esac + + +case "$action" in + ''|nil) + echo ERROR: "Nothing to do - missing command" >&2 + help >&2 + exit 1 + ;; + convert) + if [ -z "$DOCKER_IMAGE" ] || [ -z "$CHROOT_METADIR" ] ; then + echo ERROR: "Missing argument" >&2 + help >&2 + exit 1 + fi + + if [ -e "$CHROOT_METADIR" ] ; then + echo ERROR: "Filepath already exists: ${CHROOT_METADIR}" >&2 + echo ERROR: "Please rename it, remove it or use different name" >&2 + echo ERROR: "I need my working directory empty, thanks" >&2 + exit 1 + fi + + # check if docker image is there + check_docker_image "$DOCKER_IMAGE" + + # we must be root + if [ "$(id -u)" -ne 0 ] ; then + echo ERROR: "I need root privileges and you are not root: $(id -nu)" >&2 + exit 1 + fi + + # making sure that CHROOT_METADIR is absolute path + CHROOT_METADIR=$(readlink -f "$CHROOT_METADIR") + + # set trap + trap on_exit INT QUIT TERM EXIT + + # making readme + mkdir -p "$CHROOT_METADIR"/ + readme + + # create container + DOCKER_CONTAINER=$(docker create "$DOCKER_IMAGE") + if [ -z "$DOCKER_CONTAINER" ] ; then + echo ERROR: "I could not create a container from: ${DOCKER_IMAGE}" >&2 + exit 1 + fi + + # unpacking of image + mkdir -p "$CHROOT_METADIR"/chroot + echo INFO: "Export started - it can take a while to finish..." >&2 + if ! docker export "$DOCKER_CONTAINER" | tar -C "$CHROOT_METADIR"/chroot -xf - ; then + echo ERROR: "Unpacking failed - permissions?" >&2 + exit 1 + else + echo INFO: "Export success: $CHROOT_METADIR/chroot" >&2 + echo INFO: "Checkout the README file: $CHROOT_METADIR/README.md" >&2 + fi + ;; +esac + +exit 0 + |