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