uninstall.sh

#!/bin/sh
#                       W
#                      R RW        W.
#                    RW::::RW    DR::R
#         :RRRRRWWWWRt:::::::RRR::::::E        jR
#          R.::::::::::::::::::::::::::Ri  jiR:::R
#           R:::::::.RERRRRWWRERR,::::::Efi:::::::R             GjRRR Rj
#            R::::::.R             R:::::::::::::;G    RRj    WWR    RjRRRRj
#            Rt::::WR      RRWR     R::::::::::::::::fWR::R;  WRW    RW    R
#        WWWWRR:::EWR     E::W     WRRW:::EWRRR::::::::: RRED WR    RRW   RR
#        'R:::::::RRR            RR     DWW   R::::::::RW   LRRR    WR    R
#          RL:::::WRR       GRWRR        RR   R::WRiGRWW    RRR    RRR   R
#            Ri:::WWD    RWRRRWW   WWR   LR   R W    RR    RRRR    RR    R
#   RRRWWWWRE;,:::WW     R:::RW   RR:W   RR   ERE    RR    RRR    RRR    R
#    RR:::::::::::RR    tR:::WR   Wf:R   RW    R     R     RRR    RR    R
#      WR::::::::tRR    WR::RW   ER.R   RRR       R       RRRR    RR    R
#         WE:::::RR     R:::RR   :RW   E RR      RW;     GRRR    RR    R
#         R.::::,WR     R:::GRW       E::RR     WiWW     RRWR   LRRWWRR
#       WR::::::RRRRWRG::::::RREWDWRj::::RW  ,WR::WR    iRWWWWWRWW    R
#     LR:::::::::::::::::::::::::::::::::EWRR::::::RRRDi:::W    RR   R
#    R:::::::::::::::::::::::::::::::::::::::::::::::::::tRW   RRRWWWW
#  RRRRRRRRRRR::::::::::::::::::::::::::::::::::::,:::DE RRWRWW,
#            R::::::::::::: RW::::::::R::::::::::RRWRRR
#            R::::::::::WR.  ;R::::;R  RWi:::::ER
#            R::::::.RR       Ri:iR       RR:,R
#            E::: RE           RW           Y
#            ERRR
#            G       Zero-configuration Rack server for Mac OS X
#                    http://pow.cx/
#
#     This is the uninstallation script for Pow.
#     See the full annotated source: http://pow.cx/docs/
#
#     Uninstall Pow by running this command:
#     curl get.pow.cx/uninstall.sh | sh


# Set up the environment.

      set -e
      POW_ROOT="$HOME/Library/Application Support/Pow"
      POW_CURRENT_PATH="$POW_ROOT/Current"
      POW_VERSIONS_PATH="$POW_ROOT/Versions"
      POWD_PLIST_PATH="$HOME/Library/LaunchAgents/cx.pow.powd.plist"
      FIREWALL_PLIST_PATH="/Library/LaunchDaemons/cx.pow.firewall.plist"
      POW_CONFIG_PATH="$HOME/.powconfig"

# Fail fast if Pow isn't present.

      if [[ ! -d "$POW_CURRENT_PATH" ]] && [[ ! -a "$POWD_PLIST_PATH" ]] && [[ ! -a "$FIREWALL_PLIST_PATH" ]]; then
        echo "error: can't find Pow" >&2
        exit 1
      fi


# Find the tty so we can prompt for confirmation even if we're being piped from curl.

      TTY="/dev/$( ps -p$$ -o tty | tail -1 | awk '{print$1}' )"


# Make sure we really want to uninstall.

      read -p "Sorry to see you go. Uninstall Pow [y/n]? " ANSWER < $TTY
      [[ $ANSWER == "y" ]] || exit 1
      echo "*** Uninstalling Pow..."


# Remove the Versions directory and the Current symlink.

      rm -fr "$POW_VERSIONS_PATH"
      rm -f "$POW_CURRENT_PATH"


# Unload cx.pow.powd from launchctl and remove the plist.

      launchctl unload "$POWD_PLIST_PATH" 2>/dev/null || true
      rm -f "$POWD_PLIST_PATH"


# Read the firewall plist, if possible, to figure out what ports are in use.

      if [[ -a "$FIREWALL_PLIST_PATH" ]]; then
        ports=($(ruby -e'puts $<.read.scan(/fwd .*?,([\d]+).*?dst-port ([\d]+)/)' "$FIREWALL_PLIST_PATH"))

        HTTP_PORT=${ports[0]}
        DST_PORT=${ports[1]}
      fi


# Assume reasonable defaults otherwise.

      [[ -z "$HTTP_PORT" ]] && HTTP_PORT=20559
      [[ -z "$DST_PORT" ]] && DST_PORT=80


# Try to find the ipfw rule and delete it.

      RULE=$(sudo ipfw show | (grep ",$HTTP_PORT .* dst-port $DST_PORT in" || true) | cut -f 1 -d " ")
      [[ -n "$RULE" ]] && sudo ipfw del "$RULE"


# Unload the firewall plist and remove it.

      sudo launchctl unload "$FIREWALL_PLIST_PATH" 2>/dev/null || true
      sudo rm -f "$FIREWALL_PLIST_PATH"


# Remove /etc/resolver files that belong to us
      grep -Rl 'generated by Pow' /etc/resolver/ | sudo xargs rm

      echo "*** Uninstalled"