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moby--moby/contrib/mkimage.sh
Akihiro Suda 3cf82748dd run shfmt
git grep --name-only '^#!' | egrep -v '(vendor|\.go|Jenkinsfile)' | xargs shfmt -w -bn -ci -sr

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2020-03-03 12:27:49 +09:00

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#!/usr/bin/env bash
set -e
mkimg="$(basename "$0")"
usage() {
echo >&2 "usage: $mkimg [-d dir] [-t tag] [--compression algo| --no-compression] script [script-args]"
echo >&2 " ie: $mkimg -t someuser/debian debootstrap --variant=minbase jessie"
echo >&2 " $mkimg -t someuser/ubuntu debootstrap --include=ubuntu-minimal --components=main,universe trusty"
echo >&2 " $mkimg -t someuser/busybox busybox-static"
echo >&2 " $mkimg -t someuser/centos:5 rinse --distribution centos-5"
echo >&2 " $mkimg -t someuser/mageia:4 mageia-urpmi --version=4"
echo >&2 " $mkimg -t someuser/mageia:4 mageia-urpmi --version=4 --mirror=http://somemirror/"
exit 1
}
scriptDir="$(dirname "$(readlink -f "$BASH_SOURCE")")/mkimage"
os=
os=$(uname -o)
optTemp=$(getopt --options '+d:t:c:hC' --longoptions 'dir:,tag:,compression:,no-compression,help' --name "$mkimg" -- "$@")
eval set -- "$optTemp"
unset optTemp
dir=
tag=
compression="auto"
while true; do
case "$1" in
-d | --dir)
dir="$2"
shift 2
;;
-t | --tag)
tag="$2"
shift 2
;;
--compression)
compression="$2"
shift 2
;;
--no-compression)
compression="none"
shift 1
;;
-h | --help) usage ;;
--)
shift
break
;;
esac
done
script="$1"
[ "$script" ] || usage
shift
if [ "$compression" == 'auto' ] || [ -z "$compression" ]; then
compression='xz'
fi
[ "$compression" == 'none' ] && compression=''
if [ ! -x "$scriptDir/$script" ]; then
echo >&2 "error: $script does not exist or is not executable"
echo >&2 " see $scriptDir for possible scripts"
exit 1
fi
# don't mistake common scripts like .febootstrap-minimize as image-creators
if [[ "$script" == .* ]]; then
echo >&2 "error: $script is a script helper, not a script"
echo >&2 " see $scriptDir for possible scripts"
exit 1
fi
delDir=
if [ -z "$dir" ]; then
dir="$(mktemp -d ${TMPDIR:-/var/tmp}/docker-mkimage.XXXXXXXXXX)"
delDir=1
fi
rootfsDir="$dir/rootfs"
(
set -x
mkdir -p "$rootfsDir"
)
# pass all remaining arguments to $script
"$scriptDir/$script" "$rootfsDir" "$@"
# Docker mounts tmpfs at /dev and procfs at /proc so we can remove them
rm -rf "$rootfsDir/dev" "$rootfsDir/proc"
mkdir -p "$rootfsDir/dev" "$rootfsDir/proc"
# make sure /etc/resolv.conf has something useful in it
mkdir -p "$rootfsDir/etc"
cat > "$rootfsDir/etc/resolv.conf" << 'EOF'
nameserver 8.8.8.8
nameserver 8.8.4.4
EOF
tarFile="$dir/rootfs.tar${compression:+.$compression}"
touch "$tarFile"
(
set -x
tar --numeric-owner --create --auto-compress --file "$tarFile" --directory "$rootfsDir" --transform='s,^./,,' .
)
echo >&2 "+ cat > '$dir/Dockerfile'"
cat > "$dir/Dockerfile" << EOF
FROM scratch
ADD $(basename "$tarFile") /
EOF
# if our generated image has a decent shell, let's set a default command
for shell in /bin/bash /usr/bin/fish /usr/bin/zsh /bin/sh; do
if [ -x "$rootfsDir/$shell" ]; then
(
set -x
echo 'CMD ["'"$shell"'"]' >> "$dir/Dockerfile"
)
break
fi
done
(
set -x
rm -rf "$rootfsDir"
)
if [ "$tag" ]; then
(
set -x
docker build -t "$tag" "$dir"
)
elif [ "$delDir" ]; then
# if we didn't specify a tag and we're going to delete our dir, let's just build an untagged image so that we did _something_
(
set -x
docker build "$dir"
)
fi
if [ "$delDir" ]; then
(
set -x
rm -rf "$dir"
)
fi