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

1 files changed, 1 insertions, 0 deletions

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
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