systemd/shell-completion/zsh/_systemd-nspawn

#compdef systemd-nspawn

_nspawn-caps(){
    local -a _caps
    _caps=( CAP_CHOWN CAP_DAC_OVERRIDE CAP_DAC_READ_SEARCH
            CAP_FOWNER CAP_FSETID CAP_IPC_OWNER CAP_KILL CAP_LEASE CAP_LINUX_IMMUTABLE
            CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SETGID CAP_SETFCAP CAP_SETPCAP
            CAP_SETUID CAP_SYS_ADMIN CAP_SYS_CHROOT CAP_SYS_NICE CAP_SYS_PTRACE CAP_SYS_TTY_CONFIG
            CAP_SYS_RESOURCE CAP_SYS_BOOT )
    _values -s , 'capabilities' "$_caps[@]"
}

_arguments \
    {-h,--help}'[Show this help]' \
    {--directory=,-D+}'[Directory to use as file system root for the namespace container. If omitted the current directory will be used.]:directories:_directories' \
    {--boot,-b+}'[Automatically search for an init binary and invoke it instead of a shell or a user supplied program.]' \
    {--user=,-u+}'[Run the command under specified user, create home directory and cd into it.]' \
    '--uuid=[Set the specified uuid for the container.]' \
    {--controllers=,-C+}'[Makes the container appear in other hierarchies than the name=systemd:/ one. Takes a comma-separated list of controllers.]' \
    '--private-network[Turn off networking in the container. This makes all network interfaces unavailable in the container, with the exception of the loopback device.]' \
    '--read-only[Mount the root file system read only for the container.]' \
    '--capability=[List one or more additional capabilities to grant the container.]:capabilities:_nspawn-caps' \
    "--link-journal=[Control whether the container's journal shall be made visible to the host system.]:options:(no, host, guest, auto)" \
    '-j[Equivalent to --link-journal=guest.]'