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173 lines
4.1 KiB
173 lines
4.1 KiB
#! /usr/bin/env bash
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set -e -o pipefail
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os=
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arch=
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imageName=
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imageTag=
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imageDigest=
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finalImageName=
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finalImageTag=
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hashType=$NIX_HASH_ALGO
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hashFormat=$hashFormat
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format=nix
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usage(){
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echo >&2 "syntax: nix-prefetch-docker [options] [IMAGE_NAME [IMAGE_TAG|IMAGE_DIGEST]]
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Options:
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--os os OS to fetch image for
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--arch linux Arch to fetch image for
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--image-name name Name of the image to fetch
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--image-tag tag Image tag
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--image-digest digest Image digest
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--final-image-name name Desired name of the image
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--final-image-tag tag Desired image tag
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--json Output result in json format instead of nix
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--quiet Only print the final result
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"
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exit 1
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}
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get_image_digest(){
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local imageName=$1
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local imageTag=$2
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if test -z "$imageTag"; then
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imageTag="latest"
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fi
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skopeo --insecure-policy --tmpdir=$TMPDIR inspect "docker://$imageName:$imageTag" | jq '.Digest' -r
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}
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get_name() {
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local imageName=$1
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local imageTag=$2
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echo "docker-image-$(echo "$imageName:$imageTag" | tr '/:' '-').tar"
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}
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argi=0
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argfun=""
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for arg; do
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if test -z "$argfun"; then
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case $arg in
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--os) argfun=set_os;;
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--arch) argfun=set_arch;;
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--image-name) argfun=set_imageName;;
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--image-tag) argfun=set_imageTag;;
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--image-digest) argfun=set_imageDigest;;
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--final-image-name) argfun=set_finalImageName;;
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--final-image-tag) argfun=set_finalImageTag;;
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--quiet) QUIET=true;;
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--json) format=json;;
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--help) usage; exit;;
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*)
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: $((++argi))
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case $argi in
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1) imageName=$arg;;
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2) [[ $arg == *"sha256"* ]] && imageDigest=$arg || imageTag=$arg;;
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*) exit 1;;
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esac
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;;
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esac
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else
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case $argfun in
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set_*)
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var=${argfun#set_}
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eval $var=$arg
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;;
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esac
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argfun=""
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fi
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done
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if test -z "$imageName"; then
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usage
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fi
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if test -z "$os"; then
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os=linux
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fi
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if test -z "$arch"; then
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arch=amd64
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fi
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if test -z "$hashType"; then
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hashType=sha256
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fi
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if test -z "$hashFormat"; then
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hashFormat=base32
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fi
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if test -z "$finalImageName"; then
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finalImageName="$imageName"
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fi
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if test -z "$finalImageTag"; then
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if test -z "$imageTag"; then
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finalImageTag="latest"
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else
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finalImageTag="$imageTag"
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fi
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fi
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if test -z "$imageDigest"; then
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imageDigest=$(get_image_digest $imageName $imageTag)
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fi
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sourceUrl="docker://$imageName@$imageDigest"
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tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/skopeo-copy-tmp-XXXXXXXX")"
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trap "rm -rf \"$tmpPath\"" EXIT
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tmpFile="$tmpPath/$(get_name $finalImageName $finalImageTag)"
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if test -z "$QUIET"; then
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skopeo --insecure-policy --tmpdir=$TMPDIR --override-os ${os} --override-arch ${arch} copy "$sourceUrl" "docker-archive://$tmpFile:$finalImageName:$finalImageTag" >&2
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else
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skopeo --insecure-policy --tmpdir=$TMPDIR --override-os ${os} --override-arch ${arch} copy "$sourceUrl" "docker-archive://$tmpFile:$finalImageName:$finalImageTag" > /dev/null
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fi
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# Compute the hash.
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imageHash=$(nix-hash --flat --type $hashType --base32 "$tmpFile")
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# Add the downloaded file to Nix store.
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finalPath=$(nix-store --add-fixed "$hashType" "$tmpFile")
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if test -z "$QUIET"; then
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echo "-> ImageName: $imageName" >&2
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echo "-> ImageDigest: $imageDigest" >&2
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echo "-> FinalImageName: $finalImageName" >&2
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echo "-> FinalImageTag: $finalImageTag" >&2
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echo "-> ImagePath: $finalPath" >&2
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echo "-> ImageHash: $imageHash" >&2
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fi
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if [ "$format" == "nix" ]; then
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cat <<EOF
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{
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imageName = "$imageName";
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imageDigest = "$imageDigest";
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sha256 = "$imageHash";
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finalImageName = "$finalImageName";
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finalImageTag = "$finalImageTag";
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}
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EOF
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else
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cat <<EOF
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{
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"imageName": "$imageName",
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"imageDigest": "$imageDigest",
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"sha256": "$imageHash",
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"finalImageName": "$finalImageName",
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"finalImageTag": "$finalImageTag"
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}
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EOF
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fi
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