darwin.linux-builder: Exit scripts on error

For example, if the user decided to ctrl-c upon getting the sudo
password prompt, the script previously continued on to start the VM, but
that should not be the case.

Changed files
+5
nixos
modules
+5
nixos/modules/profiles/macos-builder.nix
···
# This installCredentials script is written so that it's as easy as
# possible for a user to audit before confirming the `sudo`
installCredentials = hostPkgs.writeShellScript "install-credentials" ''
+
set -euo pipefail
+
KEYS="''${1}"
INSTALL=${hostPkgs.coreutils}/bin/install
"''${INSTALL}" -g nixbld -m 600 "''${KEYS}/${user}_${keyType}" ${privateKey}
···
hostPkgs = config.virtualisation.host.pkgs;
script = hostPkgs.writeShellScriptBin "create-builder" (
+
''
+
set -euo pipefail
+
'' +
# When running as non-interactively as part of a DarwinConfiguration the working directory
# must be set to a writeable directory.
(if cfg.workingDirectory != "." then ''