lock.hh

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#pragma once
 
#include <memory>
 
#include <sys/types.h>
#include <vector>
 
namespace nix {
 
struct UserLock
{
    virtual ~UserLock() { }

    std::pair<uid_t, uid_t> getUIDRange()
    {
        auto first = getUID();
        return {first, first + getUIDCount() - 1};
    }

    virtual uid_t getUID() = 0;
 
    virtual uid_t getUIDCount() = 0;
 
    virtual gid_t getGID() = 0;
 
    virtual std::vector<gid_t> getSupplementaryGIDs() = 0;
};

std::unique_ptr<UserLock> acquireUserLock(uid_t nrIds, bool useUserNamespace);
 
bool useBuildUsers();
 
}