Functions for getting process lists and process trees of podman containers from the host's perspective

pdmn-ps.functions

function pdmn-ps() {
        # With this one can do like, given a container called tor-client,
        # kill -HUP $(pdmn-ps tor-client | \
        #             grep -F ' tor -f /config/torrc --defaults-torrc /config/torrc.custom.default' | \
        #             awk '{ print $2 }')
        # Useful for when one has both a client and a relay, and has a smaller overhead than exec-ing into the container.
        local container_pid
        [[ -n "${1}" ]] && podman container exists "${1}" && { \
                container_pid=$(podman inspect --format '{{.State.Pid}}' "${1}")
                ps -o 'user,pid,%cpu,%mem,vsz,rss,tty,stat,lstart,time,command' \
                        $(ps -e --no-header -o pid,ppid | awk -vp=${container_pid} 'function r(s) { print s; s=a[s]; while(s) { sub(",", "", s); t=s; sub(",.*", "", t); sub("[0-9]+", "", s); r(t); }; } { a[$2]=a[$2]","$1; } END { r(p) }')
        }
}

function pdmn-pstree() {
        local container_pid
        [[ -n "${1}" ]] && podman container exists "${1}" && { \
                container_pid=$(podman inspect --format '{{.State.Pid}}' "${1}")
                pstree -TUaclp -H ${container_pid} ${container_pid}
        }
}

_pdmn_ps_completions() {
  if [ "${#COMP_WORDS[@]}" != "2" ]; then
    return
  fi

  local suggestions=($(compgen -W "$(podman ps --format '{{.Names}}' | sort)" -- "${COMP_WORDS[1]}"))

  if [ "${#suggestions[@]}" == "1" ]; then
    local number="${suggestions[0]/%\ */}"
    COMPREPLY=("$number")
  else
    for i in "${!suggestions[@]}"; do
      suggestions[$i]="$(printf '%*s' "-$COLUMNS"  "${suggestions[$i]}")"
    done

    COMPREPLY=("${suggestions[@]}")
  fi
}
complete -F _pdmn_ps_completions pdmn-ps
complete -F _pdmn_ps_completions pdmn-pstree