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| author | sterni <sternenseemann@systemli.org> | 2022-05-26T16·47+0200 |
|---|---|---|
| committer | sterni <sternenseemann@systemli.org> | 2022-06-01T10·30+0000 |
| commit | ae422c13534d62aae68f06e5e02028dbe6884e33 (patch) | |
| tree | 3ed4bbd034df7587b7ab68619a2420899f1b7aa4 /users/sterni | |
| parent | f54ea857ec5af59fc8c1e2e7219aca523ca1f917 (diff) | |
feat(sterni/nix/misc): predicate to check if isRestrictedEval r/4198
This is merely a little demonstration of nix#6579: `users.sterni.nix.misc.isRestrictEval` returns whether the restrict-eval setting is true or false by exploiting the aforementioned Nix bug. Change-Id: Icca354d1cd6571cdf0804abae27aac91a18cda1e Reviewed-on: https://cl.tvl.fyi/c/depot/+/5692 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
Diffstat (limited to 'users/sterni')
| -rw-r--r-- | users/sterni/nix/misc/default.nix | 18 | ||||
| l--------- | users/sterni/nix/misc/guinea-pig | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/users/sterni/nix/misc/default.nix b/users/sterni/nix/misc/default.nix new file mode 100644 index 000000000000..1de9c973ec84 --- /dev/null +++ b/users/sterni/nix/misc/default.nix @@ -0,0 +1,18 @@ +{ ... }: + +let + /* Returns true if it is being evaluated using restrict-eval, false if not. + It's more robust than using `builtins.getEnv` since it isn't fooled by + `env -i`. + + See https://github.com/NixOS/nix/issues/6579 for a description of the + behavior. Precise cause in the evaluator / store implementation is unclear. + + Type: bool + */ + inRestrictedEval = builtins.pathExists (toString ./guinea-pig + "/."); +in + +{ + inherit inRestrictedEval; +} diff --git a/users/sterni/nix/misc/guinea-pig b/users/sterni/nix/misc/guinea-pig new file mode 120000 index 000000000000..73537e478e3f --- /dev/null +++ b/users/sterni/nix/misc/guinea-pig @@ -0,0 +1 @@ +default.nix \ No newline at end of file |