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libstore: fix Unix sockets in the build directory on sandboxed macOS

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We’re already allowing `/tmp` anyway, so this should be harmless,
and it fixes a regression in the default configuration caused by
moving the build directories out of `temp-dir`. (For instance, that
broke the Lix `guessOrInventPath.sockets` test.)

Note that removing `/tmp` breaks quite a few builds, so although it may
be a good idea in general it would require work on the Nixpkgs side.

Fixes: 749afbbe99fd7b45f828b72628252feba9241362
Change-Id: I6a6a69645f429bc50d4cb24283feda3d3091f534

(This is a cherry-pick of commit d1db3e5fa3faa43b3d2f2e2e843e9cfc1e6e1b71)

Lix patch: https://gerrit.lix.systems/c/lix/+/3500
This commit is contained in:
Emily 2025-06-27 14:42:07 +01:00 • committed by Sergei Zimmerman
parent b124512388
commit 5cd94436f5
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GPG key ID: A9B0B557CA632325
2 changed files with 6 additions and 2 deletions
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2
src/libstore/unix/build/darwin-derivation-builder.cc
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@ -160,6 +160,8 @@ struct DarwinDerivationBuilder : DerivationBuilderImpl
if (getEnv("_NIX_TEST_NO_SANDBOX") != "1") {
Strings sandboxArgs;
sandboxArgs.push_back("_NIX_BUILD_TOP");
sandboxArgs.push_back(tmpDir);
sandboxArgs.push_back("_GLOBAL_TMP_DIR");
sandboxArgs.push_back(globalTmpDir);
if (drvOptions.allowLocalNetworking) {

6
src/libstore/unix/build/sandbox-defaults.sb
View file

@ -29,12 +29,14 @@ R""(
; Allow getpwuid.
(allow mach-lookup (global-name "com.apple.system.opendirectoryd.libinfo"))
; Access to /tmp.
; Access to /tmp and the build directory.
; The network-outbound/network-inbound ones are for unix domain sockets, which
; we allow access to in TMPDIR (but if we allow them more broadly, you could in
; theory escape the sandbox)
(allow file* process-exec network-outbound network-inbound
(literal "/tmp") (subpath TMPDIR))
(literal "/tmp")
(subpath TMPDIR)
(subpath (param "_NIX_BUILD_TOP")))
; Some packages like to read the system version.
(allow file-read*