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local-derivation-goal.cc: improve error messages when sandboxing fails

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The failure modes for nix's sandboxing setup are pretty complicated.
When nix is unable to set up the sandbox, let's provide more detail
about what went wrong.  Specifically:

* Make sure the error message includes the word "sandbox" so the user
  knows that the failure was related to sandboxing.

* If `--option sandbox-fallback false` was provided, and removing it
  would have allowed further attempts to make progress, let the user
  know.
This commit is contained in:
Adam Joseph 2022-07-16 14:39:22 -07:00
parent 59764eb842
commit 8ea3a911aa
1 changed files with 17 additions and 7 deletions
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24
src/libstore/build/local-derivation-goal.cc
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@ -850,13 +850,23 @@ void LocalDerivationGoal::startBuilder()
flags &= ~CLONE_NEWUSER;
child = clone(childEntry, stack + stackSize, flags, this);
}
/* Otherwise exit with EPERM so we can handle this in the
parent. This is only done when sandbox-fallback is set
to true (the default). */
if (child == -1 && (errno == EPERM || errno == EINVAL) && settings.sandboxFallback)
_exit(1);
if (child == -1) throw SysError("cloning builder process");
if (child == -1)
switch(errno) {
case EPERM:
case EINVAL: {
/* Otherwise exit with EPERM so we can handle this in the
parent. This is only done when sandbox-fallback is set
to true (the default). */
if (settings.sandboxFallback)
_exit(1);
/* Mention sandbox-fallback in the error message so the user
knows that having it disabled contributed to the
unrecoverability of this failure */
throw SysError("creating sandboxed builder process using clone(), without sandbox-fallback");
}
default:
throw SysError("creating sandboxed builder process using clone()");
}
writeFull(builderOut.writeSide.get(),
fmt("%d %d\n", usingUserNamespace, child));
_exit(0);