Re: [libvirt] [PATCHv2 05/15] util: make virSetUIDGID a NOP only when uid or gid is -1

Rather than treating uid:gid of 0:0 as a NOP, we blindly pass that through to the lower layers. However, we *do* check for a requested value of "-1" to mean "don't change this setting". setregid() and setreuid() already interpret -1 as a NOP, so this is just an optimization, but we are also calling getpwuid_r and initgroups, and it's unclear what the former would do with a uid of -1. --- Change from V1: * only bypass uid/gid setting if they are -1 rather than > 0 * cast -1 to ([gu]id_t) when comparing to a [gu]id_t