mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-22 15:03:28 +00:00
846 lines
28 KiB
Nix
846 lines
28 KiB
Nix
{
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buildPackages,
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cacert,
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callPackage,
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closureInfo,
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coreutils,
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docker,
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e2fsprogs,
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findutils,
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go,
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jq,
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jshon,
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lib,
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makeWrapper,
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moreutils,
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nix,
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pigz,
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referencesByPopularity,
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rsync,
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runCommand,
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runtimeShell,
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shadow,
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skopeo,
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stdenv,
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storeDir ? builtins.storeDir,
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substituteAll,
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symlinkJoin,
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utillinux,
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vmTools,
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writeReferencesToFile,
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writeScript,
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writeText,
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writePython3,
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system, # Note: This is the cross system we're compiling for
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}:
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# WARNING: this API is unstable and may be subject to backwards-incompatible changes in the future.
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let
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mkDbExtraCommand = contents: let
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contentsList = if builtins.isList contents then contents else [ contents ];
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in ''
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echo "Generating the nix database..."
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echo "Warning: only the database of the deepest Nix layer is loaded."
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echo " If you want to use nix commands in the container, it would"
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echo " be better to only have one layer that contains a nix store."
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export NIX_REMOTE=local?root=$PWD
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# A user is required by nix
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# https://github.com/NixOS/nix/blob/9348f9291e5d9e4ba3c4347ea1b235640f54fd79/src/libutil/util.cc#L478
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export USER=nobody
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${buildPackages.nix}/bin/nix-store --load-db < ${closureInfo {rootPaths = contentsList;}}/registration
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mkdir -p nix/var/nix/gcroots/docker/
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for i in ${lib.concatStringsSep " " contentsList}; do
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ln -s $i nix/var/nix/gcroots/docker/$(basename $i)
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done;
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'';
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# Map nixpkgs architecture to Docker notation
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# Reference: https://github.com/docker-library/official-images#architectures-other-than-amd64
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getArch = nixSystem: {
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aarch64-linux = "arm64v8";
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armv7l-linux = "arm32v7";
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x86_64-linux = "amd64";
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powerpc64le-linux = "ppc64le";
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i686-linux = "i386";
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}.${nixSystem} or "Can't map Nix system ${nixSystem} to Docker architecture notation. Please check that your input and your requested build are correct or update the mapping in Nixpkgs.";
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in
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rec {
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examples = callPackage ./examples.nix {
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inherit buildImage pullImage shadowSetup buildImageWithNixDb;
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};
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pullImage = let
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fixName = name: builtins.replaceStrings ["/" ":"] ["-" "-"] name;
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in
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{ imageName
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# To find the digest of an image, you can use skopeo:
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# see doc/functions.xml
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, imageDigest
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, sha256
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, os ? "linux"
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, arch ? getArch system
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# This is used to set name to the pulled image
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, finalImageName ? imageName
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# This used to set a tag to the pulled image
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, finalImageTag ? "latest"
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, name ? fixName "docker-image-${finalImageName}-${finalImageTag}.tar"
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}:
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runCommand name {
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inherit imageDigest;
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imageName = finalImageName;
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imageTag = finalImageTag;
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impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars;
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outputHashMode = "flat";
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outputHashAlgo = "sha256";
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outputHash = sha256;
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nativeBuildInputs = lib.singleton skopeo;
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SSL_CERT_FILE = "${cacert.out}/etc/ssl/certs/ca-bundle.crt";
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sourceURL = "docker://${imageName}@${imageDigest}";
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destNameTag = "${finalImageName}:${finalImageTag}";
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} ''
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skopeo --insecure-policy --tmpdir=$TMPDIR --override-os ${os} --override-arch ${arch} copy "$sourceURL" "docker-archive://$out:$destNameTag"
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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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tarsum = runCommand "tarsum" {
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nativeBuildInputs = [ go ];
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} ''
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mkdir tarsum
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cd tarsum
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cp ${./tarsum.go} tarsum.go
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export GOPATH=$(pwd)
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export GOCACHE="$TMPDIR/go-cache"
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mkdir -p src/github.com/docker/docker/pkg
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ln -sT ${docker.src}/components/engine/pkg/tarsum src/github.com/docker/docker/pkg/tarsum
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go build
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mkdir -p $out/bin
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cp tarsum $out/bin/
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'';
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# buildEnv creates symlinks to dirs, which is hard to edit inside the overlay VM
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mergeDrvs = {
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derivations,
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onlyDeps ? false
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}:
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runCommand "merge-drvs" {
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inherit derivations onlyDeps;
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} ''
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if [[ -n "$onlyDeps" ]]; then
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echo $derivations > $out
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exit 0
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fi
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mkdir $out
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for derivation in $derivations; do
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echo "Merging $derivation..."
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if [[ -d "$derivation" ]]; then
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# If it's a directory, copy all of its contents into $out.
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cp -drf --preserve=mode -f $derivation/* $out/
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else
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# Otherwise treat the derivation as a tarball and extract it
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# into $out.
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tar -C $out -xpf $drv || true
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fi
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done
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'';
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# Helper for setting up the base files for managing users and
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# groups, only if such files don't exist already. It is suitable for
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# being used in a runAsRoot script.
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shadowSetup = ''
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export PATH=${shadow}/bin:$PATH
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mkdir -p /etc/pam.d
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if [[ ! -f /etc/passwd ]]; then
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echo "root:x:0:0::/root:${runtimeShell}" > /etc/passwd
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echo "root:!x:::::::" > /etc/shadow
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fi
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if [[ ! -f /etc/group ]]; then
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echo "root:x:0:" > /etc/group
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echo "root:x::" > /etc/gshadow
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fi
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if [[ ! -f /etc/pam.d/other ]]; then
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cat > /etc/pam.d/other <<EOF
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account sufficient pam_unix.so
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auth sufficient pam_rootok.so
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password requisite pam_unix.so nullok sha512
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session required pam_unix.so
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EOF
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fi
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if [[ ! -f /etc/login.defs ]]; then
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touch /etc/login.defs
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fi
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'';
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# Run commands in a virtual machine.
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runWithOverlay = {
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name,
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fromImage ? null,
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fromImageName ? null,
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fromImageTag ? null,
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diskSize ? 1024,
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preMount ? "",
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postMount ? "",
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postUmount ? ""
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}:
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let
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result = vmTools.runInLinuxVM (
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runCommand name {
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preVM = vmTools.createEmptyImage {
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size = diskSize;
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fullName = "docker-run-disk";
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};
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inherit fromImage fromImageName fromImageTag;
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nativeBuildInputs = [ utillinux e2fsprogs jshon rsync jq ];
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} ''
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mkdir disk
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mkfs /dev/${vmTools.hd}
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mount /dev/${vmTools.hd} disk
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cd disk
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if [[ -n "$fromImage" ]]; then
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echo "Unpacking base image..."
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mkdir image
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tar -C image -xpf "$fromImage"
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if [[ -n "$fromImageName" ]] && [[ -n "$fromImageTag" ]]; then
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parentID="$(
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cat "image/manifest.json" |
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jq -r '.[] | select(.RepoTags | contains([$desiredTag])) | rtrimstr(".json")' \
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--arg desiredTag "$fromImageName:$fromImageTag"
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)"
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else
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echo "From-image name or tag wasn't set. Reading the first ID."
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parentID="$(cat "image/manifest.json" | jq -r '.[0].Config | rtrimstr(".json")')"
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fi
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cat ./image/manifest.json | jq -r '.[0].Layers | .[]' > layer-list
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else
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touch layer-list
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fi
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# Unpack all of the parent layers into the image.
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lowerdir=""
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extractionID=0
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for layerTar in $(tac layer-list); do
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echo "Unpacking layer $layerTar"
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extractionID=$((extractionID + 1))
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mkdir -p image/$extractionID/layer
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tar -C image/$extractionID/layer -xpf image/$layerTar
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rm image/$layerTar
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find image/$extractionID/layer -name ".wh.*" -exec bash -c 'name="$(basename {}|sed "s/^.wh.//")"; mknod "$(dirname {})/$name" c 0 0; rm {}' \;
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# Get the next lower directory and continue the loop.
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lowerdir=image/$extractionID/layer''${lowerdir:+:}$lowerdir
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done
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mkdir work
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mkdir layer
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mkdir mnt
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${lib.optionalString (preMount != "") ''
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# Execute pre-mount steps
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echo "Executing pre-mount steps..."
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${preMount}
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''}
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if [ -n "$lowerdir" ]; then
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mount -t overlay overlay -olowerdir=$lowerdir,workdir=work,upperdir=layer mnt
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else
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mount --bind layer mnt
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fi
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${lib.optionalString (postMount != "") ''
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# Execute post-mount steps
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echo "Executing post-mount steps..."
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${postMount}
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''}
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umount mnt
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(
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cd layer
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cmd='name="$(basename {})"; touch "$(dirname {})/.wh.$name"; rm "{}"'
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find . -type c -exec bash -c "$cmd" \;
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)
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${postUmount}
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'');
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in
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runCommand name {} ''
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mkdir -p $out
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cd ${result}
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cp layer.tar json VERSION $out
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'';
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exportImage = { name ? fromImage.name, fromImage, fromImageName ? null, fromImageTag ? null, diskSize ? 1024 }:
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runWithOverlay {
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inherit name fromImage fromImageName fromImageTag diskSize;
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postMount = ''
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echo "Packing raw image..."
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tar -C mnt --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" -cf $out .
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'';
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};
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# Create an executable shell script which has the coreutils in its
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# PATH. Since root scripts are executed in a blank environment, even
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# things like `ls` or `echo` will be missing.
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shellScript = name: text:
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writeScript name ''
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#!${runtimeShell}
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set -e
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export PATH=${coreutils}/bin:/bin
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${text}
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'';
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# Create a "layer" (set of files).
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mkPureLayer = {
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# Name of the layer
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name,
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# JSON containing configuration and metadata for this layer.
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baseJson,
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# Files to add to the layer.
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contents ? null,
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# When copying the contents into the image, preserve symlinks to
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# directories (see `rsync -K`). Otherwise, transform those symlinks
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# into directories.
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keepContentsDirlinks ? false,
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# Additional commands to run on the layer before it is tar'd up.
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extraCommands ? "", uid ? 0, gid ? 0
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}:
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runCommand "docker-layer-${name}" {
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inherit baseJson contents extraCommands;
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nativeBuildInputs = [ jshon rsync tarsum ];
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}
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''
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mkdir layer
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if [[ -n "$contents" ]]; then
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echo "Adding contents..."
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for item in $contents; do
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echo "Adding $item"
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rsync -a${if keepContentsDirlinks then "K" else "k"} --chown=0:0 $item/ layer/
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done
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else
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echo "No contents to add to layer."
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fi
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chmod ug+w layer
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if [[ -n "$extraCommands" ]]; then
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(cd layer; eval "$extraCommands")
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fi
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# Tar up the layer and throw it into 'layer.tar'.
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echo "Packing layer..."
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mkdir $out
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tarhash=$(tar -C layer --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" --owner=${toString uid} --group=${toString gid} -cf - . | tee -p $out/layer.tar | tarsum)
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# Add a 'checksum' field to the JSON, with the value set to the
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# checksum of the tarball.
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cat ${baseJson} | jshon -s "$tarhash" -i checksum > $out/json
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# Indicate to docker that we're using schema version 1.0.
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echo -n "1.0" > $out/VERSION
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echo "Finished building layer '${name}'"
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'';
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# Make a "root" layer; required if we need to execute commands as a
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# privileged user on the image. The commands themselves will be
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# performed in a virtual machine sandbox.
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mkRootLayer = {
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# Name of the image.
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name,
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# Script to run as root. Bash.
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runAsRoot,
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# Files to add to the layer. If null, an empty layer will be created.
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contents ? null,
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# When copying the contents into the image, preserve symlinks to
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# directories (see `rsync -K`). Otherwise, transform those symlinks
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# into directories.
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keepContentsDirlinks ? false,
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# JSON containing configuration and metadata for this layer.
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baseJson,
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# Existing image onto which to append the new layer.
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fromImage ? null,
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# Name of the image we're appending onto.
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fromImageName ? null,
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# Tag of the image we're appending onto.
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fromImageTag ? null,
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# How much disk to allocate for the temporary virtual machine.
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diskSize ? 1024,
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# Commands (bash) to run on the layer; these do not require sudo.
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extraCommands ? ""
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}:
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# Generate an executable script from the `runAsRoot` text.
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let
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runAsRootScript = shellScript "run-as-root.sh" runAsRoot;
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extraCommandsScript = shellScript "extra-commands.sh" extraCommands;
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in runWithOverlay {
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name = "docker-layer-${name}";
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inherit fromImage fromImageName fromImageTag diskSize;
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preMount = lib.optionalString (contents != null && contents != []) ''
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echo "Adding contents..."
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for item in ${toString contents}; do
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echo "Adding $item..."
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rsync -a${if keepContentsDirlinks then "K" else "k"} --chown=0:0 $item/ layer/
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done
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chmod ug+w layer
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'';
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postMount = ''
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mkdir -p mnt/{dev,proc,sys} mnt${storeDir}
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# Mount /dev, /sys and the nix store as shared folders.
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mount --rbind /dev mnt/dev
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mount --rbind /sys mnt/sys
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mount --rbind ${storeDir} mnt${storeDir}
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# Execute the run as root script. See 'man unshare' for
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# details on what's going on here; basically this command
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# means that the runAsRootScript will be executed in a nearly
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# completely isolated environment.
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unshare -imnpuf --mount-proc chroot mnt ${runAsRootScript}
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# Unmount directories and remove them.
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umount -R mnt/dev mnt/sys mnt${storeDir}
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rmdir --ignore-fail-on-non-empty \
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mnt/dev mnt/proc mnt/sys mnt${storeDir} \
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mnt$(dirname ${storeDir})
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'';
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postUmount = ''
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(cd layer; ${extraCommandsScript})
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echo "Packing layer..."
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mkdir -p $out
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tarhash=$(tar -C layer --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" -cf - . |
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tee -p $out/layer.tar |
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${tarsum}/bin/tarsum)
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cat ${baseJson} | jshon -s "$tarhash" -i checksum > $out/json
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# Indicate to docker that we're using schema version 1.0.
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echo -n "1.0" > $out/VERSION
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echo "Finished building layer '${name}'"
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'';
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};
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buildLayeredImage = {name, ...}@args:
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let
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stream = streamLayeredImage args;
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in
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runCommand "${name}.tar.gz" {
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inherit (stream) imageName;
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passthru = { inherit (stream) imageTag; };
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nativeBuildInputs = [ pigz ];
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} "${stream} | pigz -nT > $out";
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# 1. extract the base image
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# 2. create the layer
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# 3. add layer deps to the layer itself, diffing with the base image
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# 4. compute the layer id
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# 5. put the layer in the image
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# 6. repack the image
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buildImage = args@{
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# Image name.
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name,
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# Image tag, when null then the nix output hash will be used.
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tag ? null,
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# Parent image, to append to.
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fromImage ? null,
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# Name of the parent image; will be read from the image otherwise.
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fromImageName ? null,
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# Tag of the parent image; will be read from the image otherwise.
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fromImageTag ? null,
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# Files to put on the image (a nix store path or list of paths).
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contents ? null,
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# When copying the contents into the image, preserve symlinks to
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# directories (see `rsync -K`). Otherwise, transform those symlinks
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# into directories.
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keepContentsDirlinks ? false,
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# Docker config; e.g. what command to run on the container.
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config ? null,
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# Optional bash script to run on the files prior to fixturizing the layer.
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extraCommands ? "", uid ? 0, gid ? 0,
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# Optional bash script to run as root on the image when provisioning.
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runAsRoot ? null,
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# Size of the virtual machine disk to provision when building the image.
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diskSize ? 1024,
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# Time of creation of the image.
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created ? "1970-01-01T00:00:01Z",
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}:
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let
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baseName = baseNameOf name;
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# Create a JSON blob of the configuration. Set the date to unix zero.
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baseJson = let
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pure = writeText "${baseName}-config.json" (builtins.toJSON {
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inherit created config;
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architecture = getArch system;
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os = "linux";
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});
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impure = runCommand "${baseName}-config.json"
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{ nativeBuildInputs = [ jq ]; }
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''
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jq ".created = \"$(TZ=utc date --iso-8601="seconds")\"" ${pure} > $out
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'';
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in if created == "now" then impure else pure;
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layer =
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if runAsRoot == null
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then mkPureLayer {
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name = baseName;
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inherit baseJson contents keepContentsDirlinks extraCommands uid gid;
|
|
} else mkRootLayer {
|
|
name = baseName;
|
|
inherit baseJson fromImage fromImageName fromImageTag
|
|
contents keepContentsDirlinks runAsRoot diskSize
|
|
extraCommands;
|
|
};
|
|
result = runCommand "docker-image-${baseName}.tar.gz" {
|
|
nativeBuildInputs = [ jshon pigz coreutils findutils jq moreutils ];
|
|
# Image name and tag must be lowercase
|
|
imageName = lib.toLower name;
|
|
imageTag = if tag == null then "" else lib.toLower tag;
|
|
inherit fromImage baseJson;
|
|
layerClosure = writeReferencesToFile layer;
|
|
passthru.buildArgs = args;
|
|
passthru.layer = layer;
|
|
passthru.imageTag =
|
|
if tag != null
|
|
then lib.toLower tag
|
|
else
|
|
lib.head (lib.strings.splitString "-" (baseNameOf result.outPath));
|
|
# Docker can't be made to run darwin binaries
|
|
meta.badPlatforms = lib.platforms.darwin;
|
|
} ''
|
|
${lib.optionalString (tag == null) ''
|
|
outName="$(basename "$out")"
|
|
outHash=$(echo "$outName" | cut -d - -f 1)
|
|
|
|
imageTag=$outHash
|
|
''}
|
|
|
|
# Print tar contents:
|
|
# 1: Interpreted as relative to the root directory
|
|
# 2: With no trailing slashes on directories
|
|
# This is useful for ensuring that the output matches the
|
|
# values generated by the "find" command
|
|
ls_tar() {
|
|
for f in $(tar -tf $1 | xargs realpath -ms --relative-to=.); do
|
|
if [[ "$f" != "." ]]; then
|
|
echo "/$f"
|
|
fi
|
|
done
|
|
}
|
|
|
|
mkdir image
|
|
touch baseFiles
|
|
baseEnvs='[]'
|
|
if [[ -n "$fromImage" ]]; then
|
|
echo "Unpacking base image..."
|
|
tar -C image -xpf "$fromImage"
|
|
|
|
# Store the layers and the environment variables from the base image
|
|
cat ./image/manifest.json | jq -r '.[0].Layers | .[]' > layer-list
|
|
configName="$(cat ./image/manifest.json | jq -r '.[0].Config')"
|
|
baseEnvs="$(cat "./image/$configName" | jq '.config.Env // []')"
|
|
|
|
# Extract the parentID from the manifest
|
|
if [[ -n "$fromImageName" ]] && [[ -n "$fromImageTag" ]]; then
|
|
parentID="$(
|
|
cat "image/manifest.json" |
|
|
jq -r '.[] | select(.RepoTags | contains([$desiredTag])) | rtrimstr(".json")' \
|
|
--arg desiredTag "$fromImageName:$fromImageTag"
|
|
)"
|
|
else
|
|
echo "From-image name or tag wasn't set. Reading the first ID."
|
|
parentID="$(cat "image/manifest.json" | jq -r '.[0].Config | rtrimstr(".json")')"
|
|
fi
|
|
|
|
# Otherwise do not import the base image configuration and manifest
|
|
chmod a+w image image/*.json
|
|
rm -f image/*.json
|
|
|
|
for l in image/*/layer.tar; do
|
|
ls_tar $l >> baseFiles
|
|
done
|
|
else
|
|
touch layer-list
|
|
fi
|
|
|
|
chmod -R ug+rw image
|
|
|
|
mkdir temp
|
|
cp ${layer}/* temp/
|
|
chmod ug+w temp/*
|
|
|
|
for dep in $(cat $layerClosure); do
|
|
find $dep >> layerFiles
|
|
done
|
|
|
|
echo "Adding layer..."
|
|
# Record the contents of the tarball with ls_tar.
|
|
ls_tar temp/layer.tar >> baseFiles
|
|
|
|
# Append nix/store directory to the layer so that when the layer is loaded in the
|
|
# image /nix/store has read permissions for non-root users.
|
|
# nix/store is added only if the layer has /nix/store paths in it.
|
|
if [ $(wc -l < $layerClosure) -gt 1 ] && [ $(grep -c -e "^/nix/store$" baseFiles) -eq 0 ]; then
|
|
mkdir -p nix/store
|
|
chmod -R 555 nix
|
|
echo "./nix" >> layerFiles
|
|
echo "./nix/store" >> layerFiles
|
|
fi
|
|
|
|
# Get the files in the new layer which were *not* present in
|
|
# the old layer, and record them as newFiles.
|
|
comm <(sort -n baseFiles|uniq) \
|
|
<(sort -n layerFiles|uniq|grep -v ${layer}) -1 -3 > newFiles
|
|
# Append the new files to the layer.
|
|
tar -rpf temp/layer.tar --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" \
|
|
--owner=0 --group=0 --no-recursion --files-from newFiles
|
|
|
|
echo "Adding meta..."
|
|
|
|
# If we have a parentID, add it to the json metadata.
|
|
if [[ -n "$parentID" ]]; then
|
|
cat temp/json | jshon -s "$parentID" -i parent > tmpjson
|
|
mv tmpjson temp/json
|
|
fi
|
|
|
|
# Take the sha256 sum of the generated json and use it as the layer ID.
|
|
# Compute the size and add it to the json under the 'Size' field.
|
|
layerID=$(sha256sum temp/json|cut -d ' ' -f 1)
|
|
size=$(stat --printf="%s" temp/layer.tar)
|
|
cat temp/json | jshon -s "$layerID" -i id -n $size -i Size > tmpjson
|
|
mv tmpjson temp/json
|
|
|
|
# Use the temp folder we've been working on to create a new image.
|
|
mv temp image/$layerID
|
|
|
|
# Add the new layer ID to the end of the layer list
|
|
(
|
|
cat layer-list
|
|
# originally this used `sed -i "1i$layerID" layer-list`, but
|
|
# would fail if layer-list was completely empty.
|
|
echo "$layerID/layer.tar"
|
|
) | sponge layer-list
|
|
|
|
# Create image json and image manifest
|
|
imageJson=$(cat ${baseJson} | jq '.config.Env = $baseenv + .config.Env' --argjson baseenv "$baseEnvs")
|
|
imageJson=$(echo "$imageJson" | jq ". + {\"rootfs\": {\"diff_ids\": [], \"type\": \"layers\"}}")
|
|
manifestJson=$(jq -n "[{\"RepoTags\":[\"$imageName:$imageTag\"]}]")
|
|
|
|
for layerTar in $(cat ./layer-list); do
|
|
layerChecksum=$(sha256sum image/$layerTar | cut -d ' ' -f1)
|
|
imageJson=$(echo "$imageJson" | jq ".history |= . + [{\"created\": \"$(jq -r .created ${baseJson})\"}]")
|
|
# diff_ids order is from the bottom-most to top-most layer
|
|
imageJson=$(echo "$imageJson" | jq ".rootfs.diff_ids |= . + [\"sha256:$layerChecksum\"]")
|
|
manifestJson=$(echo "$manifestJson" | jq ".[0].Layers |= . + [\"$layerTar\"]")
|
|
done
|
|
|
|
imageJsonChecksum=$(echo "$imageJson" | sha256sum | cut -d ' ' -f1)
|
|
echo "$imageJson" > "image/$imageJsonChecksum.json"
|
|
manifestJson=$(echo "$manifestJson" | jq ".[0].Config = \"$imageJsonChecksum.json\"")
|
|
echo "$manifestJson" > image/manifest.json
|
|
|
|
# Store the json under the name image/repositories.
|
|
jshon -n object \
|
|
-n object -s "$layerID" -i "$imageTag" \
|
|
-i "$imageName" > image/repositories
|
|
|
|
# Make the image read-only.
|
|
chmod -R a-w image
|
|
|
|
echo "Cooking the image..."
|
|
tar -C image --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" --owner=0 --group=0 --xform s:'^./':: -c . | pigz -nT > $out
|
|
|
|
echo "Finished."
|
|
'';
|
|
|
|
in
|
|
result;
|
|
|
|
# Build an image and populate its nix database with the provided
|
|
# contents. The main purpose is to be able to use nix commands in
|
|
# the container.
|
|
# Be careful since this doesn't work well with multilayer.
|
|
buildImageWithNixDb = args@{ contents ? null, extraCommands ? "", ... }: (
|
|
buildImage (args // {
|
|
extraCommands = (mkDbExtraCommand contents) + extraCommands;
|
|
})
|
|
);
|
|
|
|
buildLayeredImageWithNixDb = args@{ contents ? null, extraCommands ? "", ... }: (
|
|
buildLayeredImage (args // {
|
|
extraCommands = (mkDbExtraCommand contents) + extraCommands;
|
|
})
|
|
);
|
|
|
|
streamLayeredImage = {
|
|
# Image Name
|
|
name,
|
|
# Image tag, the Nix's output hash will be used if null
|
|
tag ? null,
|
|
# Files to put on the image (a nix store path or list of paths).
|
|
contents ? [],
|
|
# Docker config; e.g. what command to run on the container.
|
|
config ? {},
|
|
# Time of creation of the image. Passing "now" will make the
|
|
# created date be the time of building.
|
|
created ? "1970-01-01T00:00:01Z",
|
|
# Optional bash script to run on the files prior to fixturizing the layer.
|
|
extraCommands ? "",
|
|
# We pick 100 to ensure there is plenty of room for extension. I
|
|
# believe the actual maximum is 128.
|
|
maxLayers ? 100
|
|
}:
|
|
assert
|
|
(lib.assertMsg (maxLayers > 1)
|
|
"the maxLayers argument of dockerTools.buildLayeredImage function must be greather than 1 (current value: ${toString maxLayers})");
|
|
let
|
|
streamScript = writePython3 "stream" {} ./stream_layered_image.py;
|
|
baseJson = writeText "${name}-base.json" (builtins.toJSON {
|
|
inherit config;
|
|
architecture = getArch system;
|
|
os = "linux";
|
|
});
|
|
|
|
contentsList = if builtins.isList contents then contents else [ contents ];
|
|
|
|
# We store the customisation layer as a tarball, to make sure that
|
|
# things like permissions set on 'extraCommands' are not overriden
|
|
# by Nix. Then we precompute the sha256 for performance.
|
|
customisationLayer = symlinkJoin {
|
|
name = "${name}-customisation-layer";
|
|
paths = contentsList;
|
|
inherit extraCommands;
|
|
postBuild = ''
|
|
mv $out old_out
|
|
(cd old_out; eval "$extraCommands" )
|
|
|
|
mkdir $out
|
|
|
|
tar \
|
|
--owner 0 --group 0 --mtime "@$SOURCE_DATE_EPOCH" \
|
|
--hard-dereference \
|
|
-C old_out \
|
|
-cf $out/layer.tar .
|
|
|
|
sha256sum $out/layer.tar \
|
|
| cut -f 1 -d ' ' \
|
|
> $out/checksum
|
|
'';
|
|
};
|
|
|
|
closureRoots = [ baseJson ] ++ contentsList;
|
|
overallClosure = writeText "closure" (lib.concatStringsSep " " closureRoots);
|
|
|
|
# These derivations are only created as implementation details of docker-tools,
|
|
# so they'll be excluded from the created images.
|
|
unnecessaryDrvs = [ baseJson overallClosure ];
|
|
|
|
conf = runCommand "${name}-conf.json" {
|
|
inherit maxLayers created;
|
|
imageName = lib.toLower name;
|
|
passthru.imageTag =
|
|
if tag != null
|
|
then tag
|
|
else
|
|
lib.head (lib.strings.splitString "-" (baseNameOf conf.outPath));
|
|
paths = referencesByPopularity overallClosure;
|
|
nativeBuildInputs = [ jq ];
|
|
} ''
|
|
${if (tag == null) then ''
|
|
outName="$(basename "$out")"
|
|
outHash=$(echo "$outName" | cut -d - -f 1)
|
|
|
|
imageTag=$outHash
|
|
'' else ''
|
|
imageTag="${tag}"
|
|
''}
|
|
|
|
# convert "created" to iso format
|
|
if [[ "$created" != "now" ]]; then
|
|
created="$(date -Iseconds -d "$created")"
|
|
fi
|
|
|
|
paths() {
|
|
cat $paths ${lib.concatMapStringsSep " "
|
|
(path: "| (grep -v ${path} || true)")
|
|
unnecessaryDrvs}
|
|
}
|
|
|
|
# Create $maxLayers worth of Docker Layers, one layer per store path
|
|
# unless there are more paths than $maxLayers. In that case, create
|
|
# $maxLayers-1 for the most popular layers, and smush the remainaing
|
|
# store paths in to one final layer.
|
|
#
|
|
# The following code is fiddly w.r.t. ensuring every layer is
|
|
# created, and that no paths are missed. If you change the
|
|
# following lines, double-check that your code behaves properly
|
|
# when the number of layers equals:
|
|
# maxLayers-1, maxLayers, and maxLayers+1, 0
|
|
store_layers="$(
|
|
paths |
|
|
jq -sR '
|
|
rtrimstr("\n") | split("\n")
|
|
| (.[:$maxLayers-1] | map([.])) + [ .[$maxLayers-1:] ]
|
|
| map(select(length > 0))
|
|
' \
|
|
--argjson maxLayers "$(( maxLayers - 1 ))" # one layer will be taken up by the customisation layer
|
|
)"
|
|
|
|
cat ${baseJson} | jq '
|
|
. + {
|
|
"store_layers": $store_layers,
|
|
"customisation_layer", $customisation_layer,
|
|
"repo_tag": $repo_tag,
|
|
"created": $created
|
|
}
|
|
' --argjson store_layers "$store_layers" \
|
|
--arg customisation_layer ${customisationLayer} \
|
|
--arg repo_tag "$imageName:$imageTag" \
|
|
--arg created "$created" |
|
|
tee $out
|
|
'';
|
|
result = runCommand "stream-${name}" {
|
|
inherit (conf) imageName;
|
|
passthru = {
|
|
inherit (conf) imageTag;
|
|
|
|
# Distinguish tarballs and exes at the Nix level so functions that
|
|
# take images can know in advance how the image is supposed to be used.
|
|
isExe = true;
|
|
};
|
|
nativeBuildInputs = [ makeWrapper ];
|
|
} ''
|
|
makeWrapper ${streamScript} $out --add-flags ${conf}
|
|
'';
|
|
in result;
|
|
}
|