eldritch horrors
bffbe73493
they're no longer used since non-diverted stores are the default now. Change-Id: I277b819340c2b69e1fd06607e562221469b77926
70 lines
2.4 KiB
Python
70 lines
2.4 KiB
Python
import shutil
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import pytest
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import re
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import dataclasses
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from testlib.fixtures.command import CommandResult
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from testlib.fixtures.nix import Nix
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from testlib.fixtures.env import ManagedEnv
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def build(nix: Nix, *args) -> CommandResult:
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expr = """
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derivation {
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name = "test";
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system = builtins.currentSystem;
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builder = "/bin/sh";
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args = [ "-c" "echo > $out" ];
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outputHashMode = "flat";
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outputHash = "sha256-AbpHGcgLb+kRsJGnwFEktk7uzpZOCcBY74+YBdrKVGs=";
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}
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"""
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return nix.nix_build(["-E", expr, "--no-link", "--no-require-sigs", *args]).run()
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@dataclasses.dataclass
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class Caches:
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good: str
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bad: str
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@pytest.fixture
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def caches(nix: Nix, env: ManagedEnv) -> Caches:
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good_path, bad_path = env.dirs.home / "good", env.dirs.home / "bad"
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good_uri, bad_uri = f"file://{good_path}", f"file://{bad_path}"
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# build the derivation
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output = build(nix).ok().stdout_s.strip()
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# copy it to the good cache
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nix.nix(["copy", output, "--to", good_uri, "--no-require-sigs"], flake=True).run().ok()
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# create the bad cache by simulating read failures
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shutil.copytree(good_path, bad_path)
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for info in bad_path.glob("*.narinfo"):
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info.chmod(0o200)
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nix.nix(["store", "delete", output], flake=True).run().ok()
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return Caches(good=good_uri, bad=bad_uri)
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def test_substitution_fallback_good_first(nix: Nix, caches: Caches):
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build(nix, "--substituters", f"{caches.good} {caches.bad}").ok()
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def test_substitution_fallback_bad_first(nix: Nix, caches: Caches):
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# we expect three warnings for the single nar: two from querying, one from the substitution itself
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result = build(nix, "--substituters", f"{caches.bad} {caches.good}").ok()
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assert len(re.findall(r"warning.*narinfo", result.stderr_s)) == 3
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def test_substitution_fallback_may_build(nix: Nix, caches: Caches):
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# we expect two errors for the single nar: one from querying, one from the substitution itself
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result = build(nix, "--substituters", f"{caches.bad}", "--fallback").ok()
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assert len(re.findall(r"error.*narinfo", result.stderr_s)) == 2
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def test_substitution_fallback_no_build(nix: Nix, caches: Caches):
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# we expect one error, and it's fatal
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result = build(nix, "--substituters", f"{caches.bad}").expect(1)
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assert len(re.findall(r"error.*narinfo", result.stderr_s)) == 1
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