Adds modular service option `process.environment` to pass an attrset of
env vars to the service manager.
`null` values actively unset the variable before the process starts.
Values are `coercedTo (either path package) str` via interpolation,
mirroring `pathOrStr`, so paths and packages render to store-path strings
with string context preserved. The type is `lazyAttrsOf`, allowing one
entry to reference another (recursive env definitions).
The systemd backend unsets entries using `unexport` in `ExecStart`,
so the variable is absent even when `Environment=` or
the inherited environment would otherwise supply it.
The systemd backend lifts non-null entries onto the primary unit wrapped
per-key with `lib.mkDefault` so they merge with the existing priority-100
`environment.PATH` binding in `nixos/lib/systemd-lib.nix` while still letting
explicit `systemd.service.environment.<k>` overrides win.
The systemd extra-root modules are loaded via `importApply`, closing `pkgs`
over `systemd/service.nix` as a non-module argument (matching the portable
`lib/services/service.nix` convention) instead of passing a redundant `pkgs`
specialArg. The docs eval threads `pkgs = throw` accordingly.
Portable coverage lives in `testers.modularServiceCompliance`: an eval-level
check that a set value round-trips and a `null` value is preserved, plus an
integration test that records the service's own `/proc/$$/environ` and asserts
the set variable is present and the null variable is absent. The
systemd-specific grep assertions in `systemd/test.nix` cover how systemd
achieves this (`Environment=` rendering, null filtering, the `unexport`
wrapper, and override precedence).
Assisted-by: Claude:claude-opus-4-8
As stated in the repository¹ README:
Important
This functionality has been integrated directly into the gh CLI
https://cli.github.com/manual/gh_cache
This extension should be removed and replaced with usage of gh cache directly
gh extension remove actions-cache
¹: https://github.com/actions/gh-actions-cache
At any rate, the repository has been archived (on Oct 21, 2024).
