vendor_hal_makefile_generator.sh

#!/bin/bash
# Copyright (c) 2018, The Linux Foundation. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
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#       with the distribution.
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# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE US

# This file is used to generate blueprint/makefiles for the vendor hals

# Sanitize host tools
LS=`which ls`
LS=${LS:-ls}
MV=`which mv`
MV=${MV:-mv}
CAT=`which cat`
CAT=${CAT:-cat}
CUT=`which cut`
CUT=${CUT:-cut}
REV=`which rev`
REV=${REV:-rev}
SED=`which sed`
SED=${SED:-sed}
DIFF=`which diff`
DIFF=${DIFF:-diff}
ECHO=`which echo`
ECHO=${ECHO:-echo}
FIND=`which find`
FIND=${FIND:-find}
GREP=`which grep`
GREP=${GREP:-grep}
SORT=`which sort`
SORT=${SORT:-sort}
TOUCH=`which touch`
TOUCH=${TOUCH:-touch}

function generate_make_files() {
    local dir_path="$ANDROID_BUILD_TOP/$1"
    pushd $dir_path > /dev/null

    # Due to same package name in different folders we need to detect
    # opensource case so that it can be handled.
    local flag_opensource=false
    if ${ECHO} "$dir_path" | ${GREP} "opensource" > /dev/null;then
        flag_opensource=true
    fi

    # Search for all HAL files in given dir.
    local halFilePaths=`${ECHO} $(${FIND} -iname "*.hal" | ${SORT})`

    #Store package name in below array to create a unique set so that we trigger
    #hidl-gen only once  for a given package.
    package_collection=()

    #Iterate over identified .hal Paths
    local prev_path=""
    for file in $halFilePaths; do
        local hal_path=`${ECHO} "$file" | ${REV} | ${CUT} -d"/" -f2- | ${REV}`
        if [ -e "$hal_path/Android.bp" ] && [ ! -e "$hal_path/.hidl-autogen" ]; then
            if [ ! "$hal_path" = "$prev_path" ]; then
                ${ECHO} "Skipping hidl-gen on $1/$hal_path as Android.bp is not compile-time generated"
                prev_path="$hal_path"
            fi
            continue;
        fi
        prev_path="$hal_path"

        # Find out package name from HAL file
        local hal_package=`${ECHO} $(${CAT} $file | ${GREP} -E -m 1 "^package ") | ${CUT} -d' ' -f2`

        # Get rid of extra delimter
        hal_package=${hal_package%?}

        #Check if we already executed hidl-gen for a given package
        if ${ECHO} "${package_collection[@]}" | ${GREP} $hal_package > /dev/null; then
            continue;
        else
            package_collection+=($hal_package)
            local delimeter=`${ECHO} "$file" | ${CUT} -d'/' -f2`
            local root=`${ECHO} "$hal_package" | ${SED} "s/$delimeter/#/g" | ${CUT} -d'#' -f1`
            #Identify Package Root
            root=${root%?}
            #Create root arguments for hidl-command
            local root_arguments="-r $root:$1 -r  $2"
        fi

        local hal_path2=$1;
        #Handling for opensource HAL to solve package name conflict
        if [ "$flag_opensource" = true ]; then
            root="$root.$delimeter"
            hal_path2="$hal_path2/$delimeter"
        fi

        local root_arguments="-r $root:$hal_path2 -r  $2"

        update_check=0
        if [ -e "$hal_path/Android.bp" ]; then
            ${MV} $hal_path/Android.bp $hal_path/.hidl-autogen
            update_check=1
        fi
        ${TOUCH} $hal_path/.hidl-autogen

        ${ECHO} -n "Running hidl-gen on $hal_package: "
        hidl-gen -Landroidbp $root_arguments $hal_package;
        rc=$?; if [[ $rc != 0 ]]; then return $rc; fi

        if [ "$update_check" -eq 1 ]; then
            ${DIFF} -q $hal_path/Android.bp $hal_path/.hidl-autogen > /dev/null
            if [ $? -eq 0 ]; then
                ${ECHO} "no changes"
                ${MV} $hal_path/.hidl-autogen $hal_path/Android.bp
            else
                ${ECHO} "updated"
            fi
        else
            ${ECHO} "created"
        fi
        ${TOUCH} $hal_path/.hidl-autogen
    done
    popd > /dev/null
}

function start_script_for_interfaces {
    #Find interfaces in workspace
    local interfaces=$(${LS} -d ${ANDROID_BUILD_TOP}/vendor/qcom/*/interfaces)

    ${ECHO} "HIDL interfaces:  Scanning for changes..."
    for interface in $interfaces; do
        #generate interfaces
        local relative_interface=${interface#${ANDROID_BUILD_TOP}/}
        generate_make_files $relative_interface "android.hidl:system/libhidl/transport"
        if [ $? -ne 0 ] ; then
           ${ECHO} "HIDL interfaces: Update Failed"
           return 1;
        fi
    done
    ${ECHO} "HIDL interfaces:  Update complete."
}

#Start script for interfaces
start_script_for_interfaces