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dockerTools.pullImage: Skopeo pulls images by digest
Skopeo is used to pull images from a Docker registry (instead of a Docker deamon in a VM). An image reference is specified with its name and its digest which is an immutable image identifier (unlike image name and tag). Skopeo can be used to get the digest of an image, for instance: $ skopeo inspect docker://docker.io/nixos/nix:1.11 | jq -r '.Digest'
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@ -32,7 +32,28 @@ rec {
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inherit pkgs buildImage pullImage shadowSetup buildImageWithNixDb;
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};
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pullImage = callPackage ./pull.nix {};
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pullImage =
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let
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fixName = name: builtins.replaceStrings ["/" ":"] ["-" "-"] name;
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in {
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imageName,
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# To find the digest of an image, you can use skopeo:
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# skopeo inspect docker://docker.io/nixos/nix:1.11 | jq -r '.Digest'
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# sha256:20d9485b25ecfd89204e843a962c1bd70e9cc6858d65d7f5fadc340246e2116b
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imageDigest,
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sha256,
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# This used to set a tag to the pulled image
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finalImageTag ? "latest",
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name ? (fixName "docker-image-${imageName}-${finalImageTag}.tar") }:
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runCommand name {
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impureEnvVars=pkgs.stdenv.lib.fetchers.proxyImpureEnvVars;
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outputHashMode="flat";
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outputHashAlgo="sha256";
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outputHash=sha256;
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}
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''
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${pkgs.skopeo}/bin/skopeo copy docker://${imageName}@${imageDigest} docker-archive://$out:${imageName}:${finalImageTag}
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'';
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# We need to sum layer.tar, not a directory, hence tarsum instead of nix-hash.
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# And we cannot untar it, because then we cannot preserve permissions ecc.
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@ -560,7 +581,7 @@ rec {
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chmod -R a-w image
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echo "Cooking the image..."
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tar -C image --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" --owner=0 --group=0 --xform s:'./':: -c . | pigz -nT > $out
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tar -C image --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" --owner=0 --group=0 --xform s:'^./':: -c . | pigz -nT > $out
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echo "Finished."
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'';
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@ -85,9 +85,9 @@ rec {
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# 4. example of pulling an image. could be used as a base for other images
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nixFromDockerHub = pullImage {
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imageName = "nixos/nix";
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imageTag = "1.11";
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# this hash will need change if the tag is updated at docker hub
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sha256 = "0nncn9pn5miygan51w34c2p9qssi96jgsaqv44dxxdprc8pg0g83";
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imageDigest = "sha256:20d9485b25ecfd89204e843a962c1bd70e9cc6858d65d7f5fadc340246e2116b";
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sha256 = "0mqjy3zq2v6rrhizgb9nvhczl87lcfphq9601wcprdika2jz7qh8";
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finalImageTag = "1.11";
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};
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# 5. example of multiple contents, emacs and vi happily coexisting
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@ -1,32 +0,0 @@
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{ stdenv, lib, docker, vmTools, utillinux, curl, kmod, dhcp, cacert, e2fsprogs }:
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let
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nameReplace = name: builtins.replaceStrings ["/" ":"] ["-" "-"] name;
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in
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# For simplicity we only support sha256.
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{ imageName, imageTag ? "latest", imageId ? "${imageName}:${imageTag}"
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, sha256, name ? (nameReplace "docker-image-${imageName}-${imageTag}.tar") }:
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let
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pullImage = vmTools.runInLinuxVM (
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stdenv.mkDerivation {
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inherit name imageId;
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certs = "${cacert}/etc/ssl/certs/ca-bundle.crt";
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builder = ./pull.sh;
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nativeBuildInputs = [ curl utillinux docker kmod dhcp cacert e2fsprogs ];
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outputHashAlgo = "sha256";
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outputHash = sha256;
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impureEnvVars = lib.fetchers.proxyImpureEnvVars;
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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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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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@ -1,36 +0,0 @@
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source $stdenv/setup
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mkdir -p /var/lib/docker
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mkfs.ext4 /dev/vda
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mount -t ext4 /dev/vda /var/lib/docker
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modprobe virtio_net
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dhclient eth0
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mkdir -p /etc/ssl/certs/
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cp "$certs" "/etc/ssl/certs/"
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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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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 docker ps 2>/dev/null; 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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