pyrox.dev
ociTools: init
authored by
Katharina Fey
and committed by
Alyssa Ross
18f7f19c
43dade23
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doc/functions.xml
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doc/functions.xml
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doc/functions/ocitools.xml
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doc/functions/ocitools.xml
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xml:id="sec-pkgs-ociTools">
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<title>pkgs.ociTools</title>
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<para>
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<varname>pkgs.ociTools</varname> is a set of functions for creating
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containers according to the
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<link xlink:href="https://github.com/opencontainers/runtime-spec">OCI
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container specification v1.0.0</link>. Beyond that it makes no assumptions
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about the container runner you choose to use to run the created container.
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</para>
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<section xml:id="ssec-pkgs-ociTools-buildContainer">
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<title>buildContainer</title>
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<para>
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This function creates a simple OCI container that runs a single command
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inside of it. An OCI container consists of a <varname>config.json</varname>
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and a rootfs directory.The nix store of the container will contain all
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referenced dependencies of the given command.
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</para>
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<para>
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The parameters of <varname>buildContainer</varname> with an example value
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are described below:
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</para>
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<example xml:id='ex-ociTools-buildContainer'>
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<title>Build Container</title>
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<programlisting>
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buildContainer {
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cmd = with pkgs; writeScript "run.sh" ''
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#!${bash}/bin/bash
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${coreutils}/bin/exec ${bash}/bin/bash
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''; <co xml:id='ex-ociTools-buildContainer-1' />
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mounts = {
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"/data" = {
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type = "none";
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source = "/var/lib/mydata";
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options = [ "bind" ];
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};
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};<co xml:id='ex-ociTools-buildContainer-2' />
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readonly = false; <co xml:id='ex-ociTools-buildContainer-3' />
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}
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</programlisting>
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<calloutlist>
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<callout arearefs='ex-ociTools-buildContainer-1'>
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<para>
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<varname>cmd</varname> specifies the program to run inside the container.
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This is the only required argument for <varname>buildContainer</varname>.
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All referenced packages inside the derivation will be made available
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inside the container
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</para>
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</callout>
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<callout arearefs='ex-ociTools-buildContainer-2'>
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<para>
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<varname>mounts</varname> specifies additional mount points chosen by the
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user. By default only a minimal set of necessary filesystems are mounted
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into the container (e.g procfs, cgroupfs)
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</para>
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</callout>
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<callout arearefs='ex-ociTools-buildContainer-3'>
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<para>
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<varname>readonly</varname> makes the container's rootfs read-only if it is set to true.
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The default value is false <literal>false</literal>.
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</para>
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</callout>
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</calloutlist>
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</example>
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</section>
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</section>
+78
pkgs/build-support/oci-tools/default.nix
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pkgs/build-support/oci-tools/default.nix
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{ lib, writeText, runCommand, writeReferencesToFile }:
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{
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buildContainer =
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{ args
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, mounts ? {}
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, os ? "linux"
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, arch ? "x86_64"
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, readonly ? false
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}:
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let
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sysMounts = {
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"/proc" = {
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type = "proc";
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source = "proc";
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};
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"/dev" = {
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type = "tmpfs";
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source = "tmpfs";
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options = [ "nosuid" "strictatime" "mode=755" "size=65536k" ];
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};
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"/dev/pts" = {
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type = "devpts";
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source = "devpts";
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options = [ "nosuid" "noexec" "newinstance" "ptmxmode=0666" "mode=755" "gid=5" ];
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};
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"/dev/shm" = {
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type = "tmpfs";
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source = "shm";
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options = [ "nosuid" "noexec" "nodev" "mode=1777" "size=65536k" ];
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};
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"/dev/mqueue" = {
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type = "mqueue";
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source = "mqueue";
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options = [ "nosuid" "noexec" "nodev" ];
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};
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"/sys" = {
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type = "sysfs";
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source = "sysfs";
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options = [ "nosuid" "noexec" "nodev" "ro" ];
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};
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"/sys/fs/cgroup" = {
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type = "cgroup";
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source = "cgroup";
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options = [ "nosuid" "noexec" "nodev" "realatime" "ro" ];
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};
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};
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config = writeText "config.json" (builtins.toJSON {
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ociVersion = "1.0.0";
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platform = {
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inherit os arch;
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};
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linux = {
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namespaces = map (type: { inherit type; }) [ "pid" "network" "mount" "ipc" "uts" ];
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};
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root = { path = "rootfs"; inherit readonly; };
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process = {
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inherit args;
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user = { uid = 0; gid = 0; };
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cwd = "/";
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};
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mounts = lib.mapAttrsToList (destination: { type, source, options ? null }: {
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inherit destination type source options;
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}) sysMounts;
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});
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in
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runCommand "join" {} ''
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set -o pipefail
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mkdir -p $out/rootfs/{dev,proc,sys}
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cp ${config} $out/config.json
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xargs tar c < ${writeReferencesToFile args} | tar -xC $out/rootfs/
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'';
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}
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+2
pkgs/top-level/all-packages.nix
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pkgs/top-level/all-packages.nix
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nix-gitignore = callPackage ../build-support/nix-gitignore { };
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ociTools = callPackage ../build-support/oci-tools { };
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pathsFromGraph = ../build-support/kernel/paths-from-graph.pl;
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pruneLibtoolFiles = makeSetupHook { name = "prune-libtool-files"; }