ParsePasswd parses user entries from an /etc/passwd.

readCGroup attempts to determine the cgroup for the container by reading the fields of /proc/self/cgroup (third field) We currently only check the first line of /proc/self/cgroup.

ReadCPUQuota attempts to read the CFS CPU quota and period from the current container context.

TryUnmountProcGPUDrivers unmounts any GPU-related mounts under /proc as it causes issues when creating any container in some cases.

User is a linux user from /etc/passwd.