def _change_privilege(user, group=user)
Merb.logger.warn! "Changing privileges to #{user}:#{group}"
uid, gid = Process.euid, Process.egid
begin
target_uid = Etc.getpwnam(user).uid
rescue ArgumentError => e
Merb.fatal!("Failed to change to user #{user}, does the user exist?", e)
return false
end
begin
target_gid = Etc.getgrnam(group).gid
rescue ArgumentError => e
Merb.fatal!("Failed to change to group #{group}, does the group exist?", e)
return false
end
if (uid != target_uid) || (gid != target_gid)
Process.initgroups(user, target_gid)
Process::GID.change_privilege(target_gid)
Process::UID.change_privilege(target_uid)
end
true
rescue Errno::EPERM => e
Merb.fatal! "Permission denied for changing user:group to #{user}:#{group}.", e
false
end