Fix Darwin build
Turns out getgrouplist() is not POSIX. http://hydra.nixos.org/build/23881243
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@ -543,6 +543,7 @@ void UserLock::acquire()
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throw Error(format("the Nix user should not be a member of ‘%1%’")
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% settings.buildUsersGroup);
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#if __linux__
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/* Get the list of supplementary groups of this build user. This
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is usually either empty or contains a group such as "kvm". */
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supplementaryGIDs.resize(10);
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@ -553,6 +554,7 @@ void UserLock::acquire()
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throw Error(format("failed to get list of supplementary groups for ‘%1%’") % pw->pw_name);
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supplementaryGIDs.resize(ngroups);
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#endif
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return;
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}
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@ -2372,7 +2374,8 @@ void DerivationGoal::runChild()
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if (buildUser.enabled()) {
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/* Preserve supplementary groups of the build user, to allow
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admins to specify groups such as "kvm". */
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if (setgroups(buildUser.getSupplementaryGIDs().size(),
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if (!buildUser.getSupplementaryGIDs().empty() &&
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setgroups(buildUser.getSupplementaryGIDs().size(),
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buildUser.getSupplementaryGIDs().data()) == -1)
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throw SysError("cannot set supplementary groups of build user");
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