cros_workon: allow unmasking packages for the host

cros_workon

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script moves ebuilds between 'stable' and 'live' states.
 # By default 'stable' ebuilds point at and build from source at the
 # last known good commit. Moving an ebuild to 'live' (via cros_workon start)
 # is intended to support development. The current source tip is fetched,
 # source modified and built using the unstable 'live' (9999) ebuild.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Script must be run inside the chroot
 restart_in_chroot_if_needed $*
 get_default_board
 
 DEFINE_string board "${DEFAULT_BOARD}" \
   "The board to set package keywords for."
+DEFINE_boolean host "${FLAGS_FALSE}" \
+  "Uses the host instead of board"
 DEFINE_string command "git status" \
   "The command to be run by forall."
 
 FLAGS_HELP="usage: $0 <command> [flags]
 commands:
   start:  Moves an ebuild to live (intended to support development)
   stop:  Moves an ebuild to stable (use last known good)
   list:  List of all live ebuilds
   forall:  For each ebuild, cd to the source dir and run a commond"
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
-[ -n "${FLAGS_board}" ] || die "--board is required."
+# board dir config
+[ -n "${FLAGS_board}" ] && [ "${FLAGS_host}" = ${FLAGS_TRUE} ] && \
+  die "Flags --host and --board are mutually exclusive."
+[ -z "${FLAGS_board}" ] && [ "${FLAGS_host}" = ${FLAGS_FALSE} ] && \
+  die "You must specify either --host or --board="
+
+if [ -n "${FLAGS_board}" ]; then
+  BOARD_DIR=/build/"${FLAGS_board}" # --board specified
+  EQUERY=equery-"${FLAGS_board}"
+else
+  BOARD_DIR="" # --host specified
+  EQUERY=equery
+fi
+
 
 # eat the workon command keywords: start, stop or list.
 WORKON_CMD=$1
 shift
 
-BOARD_DIR=/build/"${FLAGS_board}"
 
 KEYWORDS_DIR=${BOARD_DIR}/etc/portage/package.keywords
 UNMASK_DIR=${BOARD_DIR}/etc/portage/package.unmask
 KEYWORDS_FILE=${KEYWORDS_DIR}/cros-workon
 UNMASK_FILE=${UNMASK_DIR}/cros-workon
 
-sudo mkdir -p "${KEYWORDS_DIR}" "${UNMASK_DIR}" || die "mkdir -p ${KEYWORDS_DIR} ${UNMASK_DIR}"
-sudo touch "${KEYWORDS_FILE}" "${UNMASK_FILE}" || die "touch ${KEYWORDS_FILE} ${UNMASK_FILE}"
+sudo mkdir -p "${KEYWORDS_DIR}" "${UNMASK_DIR}" || \
+  die "mkdir -p ${KEYWORDS_DIR} ${UNMASK_DIR}"
+sudo touch "${KEYWORDS_FILE}" "${UNMASK_FILE}" || \
+  die "touch ${KEYWORDS_FILE} ${UNMASK_FILE}"
 
 # Canonicalize package name to category/package.
 canonicalize_name () {
-  equery-${FLAGS_board} which $1 | \
+  ${EQUERY} which $1 | \
     awk -F '/' '{ print $(NF-2) "/" $(NF-1) }'
 }
 
 # Canonicalize a list of names.
 canonicalize_names () {
   local atoms=$1
   local names=""
 
   for atom in ${atoms}; do
     local name=$(canonicalize_name "${atom}")
@@ skipping 41 matching lines @@
 
   done
 }
 
 # Run a command on all or a set of repos.
 ebuild_forall() {
   local atoms=$1
 
   for atom in ${atoms}; do
     info "Running \"${FLAGS_command}\" on ${atom}"
-    eval $(ebuild-${FLAGS_board} $(equery-${FLAGS_board} which ${atom}) info)
+    eval $(ebuild-${FLAGS_board} $(${EQUERY} which ${atom}) info)
     (cd "${CROS_WORKON_SRCDIR}" && bash -c "${FLAGS_command}")
   done
 }
 
 case ${WORKON_CMD} in
   start)  ebuild_to_live "${ATOM_LIST}" ;;
   stop)   ebuild_to_stable "${ATOM_LIST}" ;;
   list)   show_live_ebuilds ;;
   forall) ebuild_forall "${ATOM_LIST}" ;;
   *)      die "invalid cros_workon command" ;;
 esac