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#pragma once
#include "types.hh"
#include <optional>
namespace nix {
struct UserLock
{
virtual ~UserLock() { }
/* Get the first and last UID. */
std::pair<uid_t, uid_t> getUIDRange()
{
auto first = getUID();
return {first, first + getUIDCount() - 1};
}
/* Get the first UID. */
virtual uid_t getUID() = 0;
virtual uid_t getUIDCount() = 0;
virtual gid_t getGID() = 0;
virtual std::vector<gid_t> getSupplementaryGIDs() = 0;
/* Kill any processes currently executing as this user. */
virtual void kill() = 0;
#if __linux__
virtual std::optional<Path> getCgroup() { return {}; };
#endif
};
/* Acquire a user lock for a UID range of size `nrIds`. Note that this
may return nullptr if no user is available. */
std::unique_ptr<UserLock> acquireUserLock(uid_t nrIds);
bool useBuildUsers();
}
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