nixos/amazon-init: add user-data shell script support
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@ -16,6 +16,16 @@ let
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userData=/etc/ec2-metadata/user-data
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# Check if user-data looks like a shell script and execute it with the
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# runtime shell if it does. Otherwise treat it as a nixos configuration
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# expression
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if IFS= LC_ALL=C read -rN2 shebang < $userData && [ "$shebang" = '#!' ]; then
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# NB: we cannot chmod the $userData file, this is why we execute it via
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# `pkgs.runtimeShell`. This means we have only limited support for shell
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# scripts compatible with the `pkgs.runtimeShell`.
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exec ${pkgs.runtimeShell} $userData
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fi
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if [ -s "$userData" ]; then
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# If the user-data looks like it could be a nix expression,
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# copy it over. Also, look for a magic three-hash comment and set
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@ -24,6 +24,7 @@ in
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_3proxy = handleTest ./3proxy.nix {};
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acme = handleTest ./acme.nix {};
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agda = handleTest ./agda.nix {};
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amazon-init-shell = handleTest ./amazon-init-shell.nix {};
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ammonite = handleTest ./ammonite.nix {};
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atd = handleTest ./atd.nix {};
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avahi = handleTest ./avahi.nix {};
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40
nixos/tests/amazon-init-shell.nix
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40
nixos/tests/amazon-init-shell.nix
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@ -0,0 +1,40 @@
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# This test verifies that the amazon-init service can treat the `user-data` ec2
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# metadata file as a shell script. If amazon-init detects that `user-data` is a
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# script (based on the presence of the shebang #! line) it executes it and
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# exits.
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# Note that other tests verify that amazon-init can treat user-data as a nixos
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# configuration expression.
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{ system ? builtins.currentSystem,
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config ? {},
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pkgs ? import ../.. { inherit system config; }
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}:
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with import ../lib/testing-python.nix { inherit system pkgs; };
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with pkgs.lib;
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makeTest {
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name = "amazon-init";
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meta = with maintainers; {
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maintainers = [ urbas ];
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};
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machine = { ... }:
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{
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imports = [ ../modules/profiles/headless.nix ../modules/virtualisation/amazon-init.nix ];
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services.openssh.enable = true;
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networking.hostName = "";
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environment.etc."ec2-metadata/user-data" = {
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text = ''
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#!/usr/bin/bash
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echo successful > /tmp/evidence
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'';
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};
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};
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testScript = ''
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# To wait until amazon-init terminates its run
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unnamed.wait_for_unit("amazon-init.service")
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unnamed.succeed("grep -q successful /tmp/evidence")
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'';
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}
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