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synced 2022-11-09 12:21:53 -05:00
Implemented as proposed by @tianon and @ypid. Restores the default behavior (using xz compression).
* `--compression=none` and `--no-compression` to disable compression. * `--compression=auto` to use the default compression (enabled by default). * `--compression=xz` to use xz compression (default compression). * `--compression=gz` to use gzip compression. Signed-off-by: Robin Schneider <ypid@riseup.net>
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commit
52e193bed7
1 changed files with 21 additions and 6 deletions
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@ -4,7 +4,7 @@ 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] script [script-args]"
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echo >&2 "usage: $mkimg [-d dir] [-t tag] [-c 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 " $mkimg -t someuser/busybox busybox-static"
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@ -16,16 +16,19 @@ usage() {
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scriptDir="$(dirname "$(readlink -f "$BASH_SOURCE")")/mkimage"
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optTemp=$(getopt --options '+d:t:h' --longoptions 'dir:,tag:,help' --name "$mkimg" -- "$@")
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optTemp=$(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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-c|--compression) compression="$2" ; shift 2 ;;
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-C|--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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@ -35,6 +38,18 @@ 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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if [ "$compression" == "none" ]
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then
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compression=""
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else
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compression=".${compression}"
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fi
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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 $scriptDir for possible scripts"
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@ -71,18 +86,18 @@ nameserver 8.8.8.8
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nameserver 8.8.4.4
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EOF
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tarFile="$dir/rootfs.tar"
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tarFile="$dir/rootfs.tar${compression}"
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touch "$tarFile"
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(
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set -x
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tar --numeric-owner -cf "$tarFile" -C "$rootfsDir" --transform='s,^./,,' .
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tar --numeric-owner --create --auto-compress --file "$tarFile" --directory "$rootfsDir" --transform='s,^./,,' .
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)
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echo >&2 "+ cat > '$dir/Dockerfile'"
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cat > "$dir/Dockerfile" <<'EOF'
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cat > "$dir/Dockerfile" <<EOF
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FROM scratch
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ADD rootfs.tar /
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ADD $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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