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Merge pull request #170906 from Sohalt/dockerTools.ca-certificates.crt

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dockerTools ca-certificates.crt helper
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Robert Hensing 2022-08-31 14:08:02 +02:00 committed by GitHub
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39
doc/builders/images/dockertools.section.md
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@ -308,7 +308,44 @@ The parameters relative to the base image have the same synopsis as described in
The `name` argument is the name of the derivation output, which defaults to `fromImage.name`.
## shadowSetup {#ssec-pkgs-dockerTools-shadowSetup}
## Environment Helpers {#ssec-pkgs-dockerTools-helpers}
Some packages expect certain files to be available globally.
When building an image from scratch (i.e. without `fromImage`), these files are missing.
`pkgs.dockerTools` provides some helpers to set up an environment with the necessary files.
You can include them in `copyToRoot` like this:
```nix
buildImage {
name = "environment-example";
copyToRoot = with pkgs.dockerTools; [
usrBinEnv
binSh
caCertificates
fakeNss
];
}
```
### usrBinEnv {#sssec-pkgs-dockerTools-helpers-usrBinEnv}
This provides the `env` utility at `/usr/bin/env`.
### binSh {#sssec-pkgs-dockerTools-helpers-binSh}
This provides `bashInteractive` at `/bin/sh`.
### caCertificates {#sssec-pkgs-dockerTools-helpers-caCertificates}
This sets up `/etc/ssl/certs/ca-certificates.crt`.
### fakeNss {#sssec-pkgs-dockerTools-helpers-fakeNss}
Provides `/etc/passwd` and `/etc/group` that contain root and nobody.
Useful when packaging binaries that insist on using nss to look up
username/groups (like nginx).
### shadowSetup {#ssec-pkgs-dockerTools-shadowSetup}
This constant string is a helper for setting up the base files for managing users and groups, only if such files don't exist already. It is suitable for being used in a [`buildImage` `runAsRoot`](#ex-dockerTools-buildImage-runAsRoot) script for cases like in the example below:

10
pkgs/build-support/docker/default.nix
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@ -792,6 +792,16 @@ rec {
ln -s ${bashInteractive}/bin/bash $out/bin/sh
'';
# This provides the ca bundle in common locations
caCertificates = runCommand "ca-certificates" { } ''
# Old NixOS compatibility.
ln -s ${cacert}/etc/ssl/certs/ca-bundle.crt $out/etc/ssl/certs/ca-bundle.crt
# NixOS canonical location + Debian/Ubuntu/Arch/Gentoo compatibility.
ln -s ${cacert}/etc/ssl/certs/ca-bundle.crt $out/etc/ssl/certs/ca-certificates.crt
# CentOS/Fedora compatibility.
ln -s ${cacert}/etc/ssl/certs/ca-bundle.crt $out/etc/pki/tls/certs/ca-bundle.crt
'';
# 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.