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local-derivation-goal.cc: save global errno to the stack before performing tests which might clobber it

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This commit is contained in:
Adam Joseph 2022-07-19 03:49:52 -07:00
parent a9e75eca00
commit 36e1383b6b
1 changed files with 4 additions and 2 deletions
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6
src/libstore/build/local-derivation-goal.cc
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@ -851,10 +851,11 @@ void LocalDerivationGoal::startBuilder()
flags &= ~CLONE_NEWUSER;
child = clone(childEntry, stack + stackSize, flags, this);
}
if (child == -1)
if (child == -1) {
switch(errno) {
case EPERM:
case EINVAL: {
int errno_ = errno;
if (!userNamespacesEnabled && errno==EPERM)
notice("user namespaces appear to be disabled; they are required for sandboxing; check /proc/sys/user/max_user_namespaces");
if (userNamespacesEnabled) {
@ -875,11 +876,12 @@ void LocalDerivationGoal::startBuilder()
/* 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");
throw SysError(errno_, "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);