nixos: add determinateNixd.authentication.additionalNetrcSources - #198
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe NixOS module adds ChangesNetrc configuration
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This adds the NixOS authentication source option while preserving valid combined daemon configuration output; no actionable merge-blocking risk remains after normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@modules/nixos.nix`:
- Around line 107-109: Normalize each path-valued entry in
authentication.additionalNetrcSources with builtins.toString before the
authentication data reaches builtins.toJSON, while preserving non-path values
and existing optional-attribute behavior. Update the configuration serialization
around the inherited authentication value and add a regression test covering a
path-valued additionalNetrcSources entry.
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modules/nixos.nix
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`builtins.toJSON` copies a Nix path value into `/nix/store` and serializes the resulting store path, so `additionalNetrcSources = [ /run/agenix/netrc ]` would publish the netrc contents world-readably and hand the daemon a source it refuses — the option's own documentation says sources under `/nix/store` make the daemon fail to start. `builtins.toString` yields the absolute path without copying, so map it over the list before serialization. String entries are unaffected, and the option type keeps accepting both so a sops/agenix path still works. Adds a check asserting the generated `/etc/determinate/config.json` for a mixed path/string list. Without the normalization it fails: under pure evaluation the store copy is refused outright, and impurely the entry becomes a `/nix/store/…` path that no longer matches. Claude-Session: https://claude.ai/code/session_01Mue3VoRkEcfN5jqdTsmQ1j
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Motivation
determinateNixd.authentication.additionalNetrcSourcesis available in thenix-darwin module but has no NixOS equivalent, so there is no declarative way to
give the daemon credentials for a private substituter on NixOS.
This matters because Determinate Nixd manages
netrc-file(
/nix/var/determinate/netrc) and regenerates it at runtime, so a NixOS usercannot append to it, and pointing
nix.settings.netrc-fileelsewhere meanslosing the FlakeHub entries.
additionalNetrcSourcesis exactly the intendedescape hatch — it is just not reachable from a NixOS config.
The daemon reads the same
/etc/determinate/config.jsonon both platforms, sothis is a module-parity gap rather than a platform limitation. The NixOS module
already back-ported
edgeCacheSubstituters; this does the same forauthentication.additionalNetrcSources.Without it, the workaround is to hand-write
environment.etc."determinate/config.json",which is fragile for the reason described below.
Also fixes a silent-corruption hazard
environment.etc.<name>.textistypes.lines, so two definitions ofdeterminate/config.jsonare concatenated, not reported as a conflict:That is two top-level objects in one file — invalid JSON, produced silently. Any
user who hand-writes the entry to reach a key the module does not expose will
break their daemon config the moment they also set
edgeCacheSubstituters.Emitting every key from one definition (as the nix-darwin module already does)
removes the hazard, and a comment records why it must stay that way.
Behaviour
edgeCacheSubstitutersadditionalNetrcSources{"edgeCacheSubstituters":[…]}{"authentication":{"additionalNetrcSources":[…]}}The
set/unsetrow is byte-identical to current output, so this isbackward compatible.
Option name, type (
nullOr (listOf (oneOf [path str]))), default, anddescription are copied from the nix-darwin module so the two stay consistent.
Path-valued sources are flattened before serialization
The type accepts
pathas well asstr(copied from nix-darwin), andbuiltins.toJSONcopies a Nix path value into/nix/storeand serializes theresulting store path. So
additionalNetrcSources = [ /run/agenix/extra-netrc ]would emit
{"authentication":{"additionalNetrcSources":["/nix/store/…-extra-netrc"]}}— publishing the netrc contents world-readably and handing the daemon a source
it refuses, which is the failure mode the option description already warns
about. Entries are mapped through
builtins.toStringfirst; that yields theabsolute path without copying. String entries are unaffected.
tests/flake.nixgains a check asserting the generated/etc/determinate/config.jsonfor a mixed path/string list. Dropping thenormalization fails it: pure evaluation refuses the store copy outright, and an
impure evaluation produces a
/nix/store/…entry that no longer matches.The nix-darwin module hands
cfg.determinateNixdtobuiltins.toJSONthe sameway and so has the same hazard for a path-valued entry. Left untouched to keep
this PR to the NixOS module — happy to fold the fix in here or send it
separately, whichever you prefer.
Related issues
sops/agenix. It was closed by pointing at
additionalNetrcSources— theright answer, but one a NixOS config has no option to reach. This PR makes it
reachable, and the path-valued case above is exactly the sops/agenix usage
that issue described.
additionalNetrcSourcesfiles are loaded only once #183 and additionalNetrcSources silently ignored without FlakeHub auth #173 are daemon-side and unchanged by this PR.additionalNetrcSourcesfiles are loaded only once #183 wants thesources re-read on every use rather than once at daemon start; additionalNetrcSources silently ignored without FlakeHub auth #173 reports
them ignored without FlakeHub auth. Both still apply after this lands, so
neither is closed by it.
Summary by CodeRabbit
New Features
determinateNixd.authentication.additionalNetrcSources.Bug Fixes