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nixpkgs/pkgs/build-support/fake-nss/default.nix
2022-10-04 00:05:34 +02:00

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Nix

# Provide a /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).
# /bin/sh is fine to not exist, and provided by another shim.
{ lib, symlinkJoin, writeTextDir, runCommand, extraPasswdLines ? [], extraGroupLines ? [] }:
symlinkJoin {
name = "fake-nss";
paths = [
(writeTextDir "etc/passwd" ''
root:x:0:0:root user:/var/empty:/bin/sh
${lib.concatStrings (map (line: line + "\n") extraPasswdLines)}nobody:x:65534:65534:nobody:/var/empty:/bin/sh
'')
(writeTextDir "etc/group" ''
root:x:0:
${lib.concatStrings (map (line: line + "\n") extraGroupLines)}nobody:x:65534:
'')
(writeTextDir "etc/nsswitch.conf" ''
hosts: files dns
'')
(runCommand "var-empty" { } ''
mkdir -p $out/var/empty
'')
];
}