docker tools: fix pull image function
This commit is contained in:
Matej Cotman
parent
e284740dd5
commit
8d3cb0af9e
@ -83,16 +83,12 @@ rec {
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};
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# 4. example of pulling an image. could be used as a base for other images
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#
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# ***** Currently broken, getting 404s. Perhaps the docker API has changed?
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#
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#
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# debian = pullImage {
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# imageName = "debian";
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# imageTag = "jessie";
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# # this hash will need change if the tag is updated at docker hub
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# sha256 = "18kd495lc2k35h03bpcbdjnix17nlqbwf6nmq3sb161blf0dk14q";
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# };
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nix = pullImage {
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imageName = "nixos/nix";
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imageTag = "1.11";
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# this hash will need change if the tag is updated at docker hub
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sha256 = "1gk4bq05vl3rj3mh4mlbl4iicgndmimlv8jvkhdk4hrv0r44bwr3";
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};
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# 5. example of multiple contents, emacs and vi happily coexisting
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editors = buildImage {
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@ -1,41 +1,32 @@
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{ stdenv, lib, curl, jshon, python, runCommand }:
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# Inspired and simplified version of fetchurl.
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{ stdenv, lib, docker, vmTools, utillinux, curl, kmod, dhcp, cacert, e2fsprogs }:
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let
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nameReplace = name: builtins.replaceStrings ["/" ":"] ["-" "-"] name;
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in
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# For simplicity we only support sha256.
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{ imageName, imageTag ? "latest", imageId ? "${imageName}:${imageTag}"
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, sha256, name ? (nameReplace "docker-image-${imageName}-${imageTag}.tar") }:
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let
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pullImage = vmTools.runInLinuxVM (
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stdenv.mkDerivation {
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inherit name imageId;
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# Currently only registry v1 is supported, compatible with Docker Hub.
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certs = "${cacert}/etc/ssl/certs/ca-bundle.crt";
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{ imageName, imageTag ? "latest", imageId ? null
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, sha256, name ? "${imageName}-${imageTag}"
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, indexUrl ? "https://index.docker.io"
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, registryVersion ? "v1"
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, curlOpts ? "" }:
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builder = ./pull.sh;
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assert registryVersion == "v1";
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buildInputs = [ curl utillinux docker kmod dhcp cacert e2fsprogs ];
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let layer = stdenv.mkDerivation {
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inherit name imageName imageTag imageId
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indexUrl registryVersion curlOpts;
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outputHashAlgo = "sha256";
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outputHash = sha256;
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builder = ./pull.sh;
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detjson = ./detjson.py;
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impureEnvVars = lib.fetchers.proxyImpureEnvVars;
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buildInputs = [ curl jshon python ];
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preVM = vmTools.createEmptyImage {
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size = 2048;
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fullName = "${name}-disk";
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};
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outputHashAlgo = "sha256";
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outputHash = sha256;
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outputHashMode = "recursive";
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impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ [
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# This variable allows the user to pass additional options to curl
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"NIX_CURL_FLAGS"
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];
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# Doing the download on a remote machine just duplicates network
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# traffic, so don't do that.
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preferLocalBuild = true;
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};
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in runCommand "${name}.tar.gz" {} ''
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tar -C ${layer} -czf $out .
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''
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QEMU_OPTS = "-netdev user,id=net0 -device virtio-net-pci,netdev=net0";
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});
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in
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pullImage
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@ -1,86 +1,36 @@
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# Reference: docker src contrib/download-frozen-image.sh
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source $stdenv/setup
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# Curl flags to handle redirects, not use EPSV, handle cookies for
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# servers to need them during redirects, and work on SSL without a
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# certificate (this isn't a security problem because we check the
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# cryptographic hash of the output anyway).
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curl=$(command -v curl)
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curl() {
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[[ -n ${token:-} ]] && set -- -H "Authorization: Token $token" "$@"
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$curl \
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--location --max-redirs 20 \
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--retry 3 \
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--fail \
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--disable-epsv \
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--cookie-jar cookies \
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--insecure \
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$curlOpts \
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$NIX_CURL_FLAGS \
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"$@"
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}
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mkdir -p /var/lib/docker
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mkfs.ext4 /dev/vda
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mount -t ext4 /dev/vda /var/lib/docker
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fetchLayer() {
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local url="$1"
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local dest="$2"
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local curlexit=18;
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modprobe virtio_net
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dhclient eth0
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# if we get error code 18, resume partial download
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while [ $curlexit -eq 18 ]; do
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# keep this inside an if statement, since on failure it doesn't abort the script
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if curl -C - "$url" --output "$dest"; then
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return 0
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else
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curlexit=$?;
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fi
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done
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mkdir -p /etc/ssl/certs/
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cp "$certs" "/etc/ssl/certs/"
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return $curlexit
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}
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headers=$(curl -o /dev/null -D- -H 'X-Docker-Token: true' \
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"$indexUrl/$registryVersion/repositories/$imageName/images")
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header() {
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grep $1 <<< "$headers" | tr -d '\r' | cut -d ' ' -f 2
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}
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# this only takes the first endpoint, more may be provided
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# https://docs.docker.com/v1.6/reference/api/docker-io_api/
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if ! registryUrl=$(header X-Docker-Endpoints); then
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echo "error: index returned no endpoint"
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exit 1
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fi
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baseUrl="https://$registryUrl/$registryVersion"
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token="$(header X-Docker-Token || true)";
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if [ -z "$imageId" ]; then
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imageId="$(curl "$baseUrl/repositories/$imageName/tags/$imageTag")"
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imageId="${imageId//\"/}"
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if [ -z "$imageId" ]; then
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echo "error: no image ID found for ${imageName}:${imageTag}"
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exit 1
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# from https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
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mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
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cd /sys/fs/cgroup
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for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
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mkdir -p $sys
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if ! mountpoint -q $sys; then
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if ! mount -n -t cgroup -o $sys cgroup $sys; then
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rmdir $sys || true
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fi
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echo "found image ${imageName}:${imageTag}@$imageId"
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fi
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mkdir -p $out
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jshon -n object \
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-n object -s "$imageId" -i "$imageTag" \
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-i "$imageName" > $out/repositories
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curl "$baseUrl/images/$imageId/ancestry" -o ancestry.json
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layerIds=$(jshon -a -u < ancestry.json)
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for layerId in $layerIds; do
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echo "fetching layer $layerId"
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mkdir "$out/$layerId"
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echo '1.0' > "$out/$layerId/VERSION"
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curl "$baseUrl/images/$layerId/json" | python $detjson > "$out/$layerId/json"
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fetchLayer "$baseUrl/images/$layerId/layer" "$out/$layerId/layer.tar"
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fi
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done
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# run docker daemon
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dockerd -H tcp://127.0.0.1:5555 -H unix:///var/run/docker.sock &
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until $(curl --output /dev/null --silent --connect-timeout 2 http://127.0.0.1:5555); do
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printf '.'
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sleep 1
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done
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rm -r $out
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docker pull ${imageId}
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docker save ${imageId} > $out
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