enableStrictShellChecks breaks Renovate tests

[l0b0]

Describe the bug

Steps to reproduce

Steps to reproduce the behavior:

1. Check out nixos/renovate: Fix ShellCheck issue #373131
2. Add systemd.enableStrictShellChecks = true; to the machine config in nixos/tests/renovate.nix
3. nix-build --attr nixosTests.renovate

Actual behavior

The test run hangs.

Expected behavior

The test should proceed as normal.

Metadata

• system: "x86_64-linux"
• host os: Linux 6.12.8, NixOS, 25.05 (Warbler), 25.05.20250108.bffc22e
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.24.11
• channels(root): ""
• nixpkgs: /nix/store/v0g0bxsd5gw6k0jz2855f8h7l1218925-source

Notify maintainers

@Scrumplex

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[Scrumplex]

Boot fails because of the test instrumentation sourcing /etc/profile. Enabling strict checks sets Bash's nounset option, which fails fatally for most profile scripts currently.

Edit: See #349579 for a workaround