Android系统编译流程详解(二)

source build/envsetup.sh 

 if [ "x$SHELL" != "x/bin/bash" ]; then
     case `ps -o command -p $$` in
         *bash*)
             ;;
         *)
             echo "WARNING: Only bash is supported, use of other shell would lead to err     oneous results"
             ;;
     esac
 fi
 
 # Execute the contents of any vendorsetup.sh files we can find.
 for f in `test -d device && find -L device -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/n     ull | sort` \
          `test -d vendor && find -L vendor -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/n     ull | sort` \
          `test -d product && find -L product -maxdepth 4 -name 'vendorsetup.sh' 2> /dev     /null | sort`
 do
     echo "including $f"
     . $f
 done

  function add_lunch_combo()
  {
      local new_combo=$1
      local c
      for c in ${LUNCH_MENU_CHOICES[@]} ; do
          if [ "$new_combo" = "$c" ] ; then
              return
          fi
      done
      LUNCH_MENU_CHOICES=(${LUNCH_MENU_CHOICES[@]} $new_combo)
  }

function lunch()
{
    local answer

    if [ "$1" ] ; then
        answer=$1
    else
        print_lunch_menu
        echo -n "Which would you like? [aosp_arm-eng] "
        read answer
    fi

    local selection=

    if [ -z "$answer" ]
    then
        selection=aosp_arm-eng
    elif (echo -n $answer | grep -q -e "^[0-9][0-9]*$")
    then
        if [ $answer -le ${#LUNCH_MENU_CHOICES[@]} ]
        then
            selection=${LUNCH_MENU_CHOICES[$(($answer-1))]}
        fi
    else
        selection=$answer
    fi

    export TARGET_BUILD_APPS=

    local product variant_and_version variant version

    product=${selection%%-*} # Trim everything after first dash
    variant_and_version=${selection#*-} # Trim everything up to first dash
    if [ "$variant_and_version" != "$selection" ]; then
        variant=${variant_and_version%%-*}
        if [ "$variant" != "$variant_and_version" ]; then
            version=${variant_and_version#*-}
        fi
    fi

    if [ -z "$product" ]
    then
        echo
        echo "Invalid lunch combo: $selection"
        return 1
    fi

    TARGET_PRODUCT=$product \
    TARGET_BUILD_VARIANT=$variant \
    TARGET_PLATFORM_VERSION=$version \
    build_build_var_cache
    if [ $? -ne 0 ]
    then
        return 1
    fi

    export TARGET_PRODUCT=$(get_build_var TARGET_PRODUCT)
    export TARGET_BUILD_VARIANT=$(get_build_var TARGET_BUILD_VARIANT)
    export TARGET_PLATFORM_VERSION=$(get_build_var TARGET_PLATFORM_VERSION)
    export TARGET_BUILD_TYPE=release

    echo

    set_stuff_for_environment
    printconfig
    destroy_build_var_cache
}