3b65b3f6d6
Fixes #78744 My previous change broke when there are more packages than the maximum number of layers. I had assumed that the `store-path-to-layer.sh` was only ever passed a single store path, but that is not the case if there are multiple packages going into the final layer. To fix this, we loop through the paths going into the final layer, appending them to the tar file and making sure they end up at the right path.
251 lines
6.6 KiB
Nix
251 lines
6.6 KiB
Nix
# Examples of using the docker tools to build packages.
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#
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# This file defines several docker images. In order to use an image,
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# build its derivation with `nix-build`, and then load the result with
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# `docker load`. For example:
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#
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# $ nix-build '<nixpkgs>' -A dockerTools.examples.redis
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# $ docker load < result
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{ pkgs, buildImage, pullImage, shadowSetup, buildImageWithNixDb }:
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rec {
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# 1. basic example
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bash = buildImage {
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name = "bash";
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tag = "latest";
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contents = pkgs.bashInteractive;
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};
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# 2. service example, layered on another image
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redis = buildImage {
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name = "redis";
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tag = "latest";
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# for example's sake, we can layer redis on top of bash or debian
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fromImage = bash;
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# fromImage = debian;
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contents = pkgs.redis;
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runAsRoot = ''
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mkdir -p /data
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'';
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config = {
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Cmd = [ "/bin/redis-server" ];
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WorkingDir = "/data";
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Volumes = {
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"/data" = {};
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};
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};
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};
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# 3. another service example
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nginx = let
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nginxPort = "80";
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nginxConf = pkgs.writeText "nginx.conf" ''
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user nginx nginx;
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daemon off;
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error_log /dev/stdout info;
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pid /dev/null;
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events {}
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http {
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access_log /dev/stdout;
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server {
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listen ${nginxPort};
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index index.html;
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location / {
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root ${nginxWebRoot};
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}
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}
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}
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'';
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nginxWebRoot = pkgs.writeTextDir "index.html" ''
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<html><body><h1>Hello from NGINX</h1></body></html>
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'';
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in
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buildImage {
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name = "nginx-container";
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tag = "latest";
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contents = pkgs.nginx;
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runAsRoot = ''
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#!${pkgs.stdenv.shell}
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${shadowSetup}
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groupadd --system nginx
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useradd --system --gid nginx nginx
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'';
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config = {
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Cmd = [ "nginx" "-c" nginxConf ];
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ExposedPorts = {
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"${nginxPort}/tcp" = {};
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};
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};
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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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nixFromDockerHub = pullImage {
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imageName = "nixos/nix";
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imageDigest = "sha256:85299d86263a3059cf19f419f9d286cc9f06d3c13146a8ebbb21b3437f598357";
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sha256 = "07q9y9r7fsd18sy95ybrvclpkhlal12d30ybnf089hq7v1hgxbi7";
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finalImageTag = "2.2.1";
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finalImageName = "nix";
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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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name = "editors";
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contents = [
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pkgs.coreutils
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pkgs.bash
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pkgs.emacs
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pkgs.vim
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pkgs.nano
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];
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};
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# 6. nix example to play with the container nix store
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# docker run -it --rm nix nix-store -qR $(nix-build '<nixpkgs>' -A nix)
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nix = buildImageWithNixDb {
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name = "nix";
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tag = "latest";
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contents = [
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# nix-store uses cat program to display results as specified by
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# the image env variable NIX_PAGER.
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pkgs.coreutils
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pkgs.nix
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];
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config = {
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Env = [
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"NIX_PAGER=cat"
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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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"USER=nobody"
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];
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};
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};
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# 7. example of adding something on top of an image pull by our
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# dockerTools chain.
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onTopOfPulledImage = buildImage {
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name = "onTopOfPulledImage";
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tag = "latest";
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fromImage = nixFromDockerHub;
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contents = [ pkgs.hello ];
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};
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# 8. regression test for erroneous use of eval and string expansion.
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# See issue #34779 and PR #40947 for details.
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runAsRootExtraCommands = pkgs.dockerTools.buildImage {
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name = "runAsRootExtraCommands";
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tag = "latest";
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contents = [ pkgs.coreutils ];
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# The parens here are to create problematic bash to embed and eval. In case
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# this is *embedded* into the script (with nix expansion) the initial quotes
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# will close the string and the following parens are unexpected
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runAsRoot = ''echo "(runAsRoot)" > runAsRoot'';
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extraCommands = ''echo "(extraCommand)" > extraCommands'';
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};
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# 9. Ensure that setting created to now results in a date which
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# isn't the epoch + 1
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unstableDate = pkgs.dockerTools.buildImage {
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name = "unstable-date";
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tag = "latest";
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contents = [ pkgs.coreutils ];
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created = "now";
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};
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# 10. Create a layered image
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layered-image = pkgs.dockerTools.buildLayeredImage {
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name = "layered-image";
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tag = "latest";
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extraCommands = ''echo "(extraCommand)" > extraCommands'';
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config.Cmd = [ "${pkgs.hello}/bin/hello" ];
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contents = [ pkgs.hello pkgs.bash pkgs.coreutils ];
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};
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# 11. Create an image on top of a layered image
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layered-on-top = pkgs.dockerTools.buildImage {
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name = "layered-on-top";
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tag = "latest";
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fromImage = layered-image;
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extraCommands = ''
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mkdir ./example-output
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chmod 777 ./example-output
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'';
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config = {
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Env = [ "PATH=${pkgs.coreutils}/bin/" ];
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WorkingDir = "/example-output";
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Cmd = [
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"${pkgs.bash}/bin/bash" "-c" "echo hello > foo; cat foo"
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];
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};
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};
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# 12. example of running something as root on top of a parent image
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# Regression test related to PR #52109
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runAsRootParentImage = buildImage {
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name = "runAsRootParentImage";
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tag = "latest";
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runAsRoot = "touch /example-file";
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fromImage = bash;
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};
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# 13. example of 3 layers images This image is used to verify the
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# order of layers is correct.
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# It allows to validate
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# - the layer of parent are below
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# - the order of parent layer is preserved at image build time
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# (this is why there are 3 images)
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layersOrder = let
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l1 = pkgs.dockerTools.buildImage {
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name = "l1";
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tag = "latest";
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extraCommands = ''
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mkdir -p tmp
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echo layer1 > tmp/layer1
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echo layer1 > tmp/layer2
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echo layer1 > tmp/layer3
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'';
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};
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l2 = pkgs.dockerTools.buildImage {
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name = "l2";
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fromImage = l1;
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tag = "latest";
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extraCommands = ''
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mkdir -p tmp
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echo layer2 > tmp/layer2
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echo layer2 > tmp/layer3
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'';
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};
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in pkgs.dockerTools.buildImage {
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name = "l3";
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fromImage = l2;
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tag = "latest";
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contents = [ pkgs.coreutils ];
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extraCommands = ''
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mkdir -p tmp
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echo layer3 > tmp/layer3
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'';
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};
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# 14. Create another layered image, for comparing layers with image 10.
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another-layered-image = pkgs.dockerTools.buildLayeredImage {
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name = "another-layered-image";
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tag = "latest";
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config.Cmd = [ "${pkgs.hello}/bin/hello" ];
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};
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# 15. Create a layered image with only 2 layers
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two-layered-image = pkgs.dockerTools.buildLayeredImage {
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name = "two-layered-image";
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tag = "latest";
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config.Cmd = [ "${pkgs.hello}/bin/hello" ];
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contents = [ pkgs.bash pkgs.hello ];
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maxLayers = 2;
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};
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}
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