#!/bin/bash

: ${CACHE_DIR:=/var/cache/build}

set_build_arch()
{
    : ${BUILD_HOST_ARCH:=`uname -m`}

    if [ -z "$BUILD_ARCH" ]; then
	BUILD_ARCH="$BUILD_HOST_ARCH"
	test i686 != "$BUILD_ARCH" || BUILD_ARCH=i586 # XXX: why?
    fi

    case $BUILD_ARCH in
      i686) BUILD_ARCH="i686:i586:i486:i386" ;;
      i586) BUILD_ARCH="i586:i486:i386" ;;
      i486) BUILD_ARCH="i486:i386" ;;
      i386) BUILD_ARCH="i386" ;;
      x86_64) BUILD_ARCH="x86_64:i686:i586:i486:i386" ;;
      sparc64v) BUILD_ARCH="sparc64v:sparc64:sparcv9v:sparcv9:sparcv8:sparc" ;;
      sparc64) BUILD_ARCH="sparc64:sparcv9:sparcv8:sparc" ;;
      sparcv9v) BUILD_ARCH="sparcv9v:sparcv9:sparcv8:sparc" ;;
      sparcv9) BUILD_ARCH="sparcv9:sparcv8:sparc" ;;
      sparcv8) BUILD_ARCH="sparcv8:sparc" ;;
      sparc) BUILD_ARCH="sparc" ;;
    esac
    if test "$BUILD_ARCH" != "${BUILD_ARCH#i686}" ; then
	cpuflags=`grep ^flags /proc/cpuinfo`
	cpuflags="$cpuflags "
	if test "$cpuflags" = "${cpuflags/ cx8 /}" -o "$cpuflags" = "${cpuflags/ cmov /}"; then
	    echo "Your cpu doesn't support i686 rpms. Exit."
	    cleanup_and_exit 1
	fi
    fi
}

check_exit()
{
    if test -e $BUILD_ROOT/exit; then
	echo "exit ..."
	cleanup_and_exit 1
    fi
}

is_emulator_arch()
{
    local arch
    local qarch=":$BUILD_ARCH:"
    for arch in $EMULATOR_ARCHS; do
	if test "$qarch" != "${qarch/:$arch:/}" -a "$BUILD_HOST_ARCH" != "$arch"; then
	    return 0
	fi
    done
    return 1
}

check_use_emulator()
{
    is_emulator_arch || return

    if [ -z "$VM_TYPE" ]; then
	return 0
    fi

    # to run the qemu initialization in the XEN chroot, we need to
    # register it with a static program or shell script
    case "$BUILD_HOST_ARCH" in
	i?86|x86_64)
	    if test -e $BUILD_DIR/initvm && \
		test -e $BUILD_DIR/qemu-reg; then
		return 0	# prefer initvm to handle registration
	    elif test -e /bin/bash-static \
		-a -e /bin/mount-static \
		-a -e /usr/sbin/qemu-binfmt-conf.sh; then
		return 0	# as backup use /usr/sbin/qemu-binfmt.conf.sh
	    else
		# XXX: error?
		echo "Warning: cross compile not possible due to missing static binaries"
	    fi
	;;
    esac
    return 1
}

# usage:
# progress_setup LIST
# for I in $LIST; do
#    progress_step LIST
#    action $I 
# done

# $1 name of a textual list
progress_setup() {
    eval "$1__ARRAY__=(\$$1)"
    eval "$1__INDEX__=1"
    eval "$1__LENGTH__=\${#$1__ARRAY__[@]}"
}

# $1 name of a textual list
# $2 optional, printf format for 2 numeric arguments (current, total)
progress_step() {
    local IDX=$1__INDEX__
    local LEN=$1__LENGTH__
    printf "${2-[%d/%d] }" $(($IDX++)) ${!LEN}
}