+qemu_environ() {
+ local env
+
+ # Don't add anything if qemu is not used.
+ if ! qemu_is_required; then
+ return
+ fi
+
+ # Set default qemu options
+ case "${BUILD_ARCH}" in
+ arm*)
+ QEMU_CPU="${QEMU_CPU:-cortex-a9}"
+
+ env="${env} QEMU_CPU=${QEMU_CPU}"
+ ;;
+ esac
+
+ # Enable QEMU strace
+ #env="${env} QEMU_STRACE=1"
+
+ echo "${env}"
+}
+
+qemu_is_required() {
+ local build_arch="${1}"
+
+ if [ -z "${build_arch}" ]; then
+ build_arch="${BUILD_ARCH}"
+ fi
+
+ case "${HOST_ARCH},${build_arch}" in
+ x86_64,arm*|i?86,arm*|i?86,x86_64)
+ return 0
+ ;;
+ *)
+ return 1
+ ;;
+ esac
+}
+
+qemu_install_helper() {
+ # Do nothing, if qemu is not required
+ if ! qemu_is_required; then
+ return 0
+ fi
+
+ if [ ! -e /proc/sys/fs/binfmt_misc/status ]; then
+ exiterror "binfmt_misc not mounted. QEMU_TARGET_HELPER not useable."
+ fi
+
+ if [ ! $(cat /proc/sys/fs/binfmt_misc/status) = 'enabled' ]; then
+ exiterror "binfmt_misc not enabled. QEMU_TARGET_HELPER not useable."
+ fi
+
+
+ if [ -z "${QEMU_TARGET_HELPER}" ]; then
+ exiterror "QEMU_TARGET_HELPER not set"
+ fi
+
+ # Check if the helper is already installed.
+ if [ -x "${LFS}${QEMU_TARGET_HELPER}" ]; then
+ return 0
+ fi
+
+ # Try to find a suitable binary that we can install
+ # to the build environment.
+ local file
+ for file in "${QEMU_TARGET_HELPER}" "${QEMU_TARGET_HELPER}-static"; do
+ # file must exist and be executable.
+ [ -x "${file}" ] || continue
+
+ # Must be static.
+ file_is_static "${file}" || continue
+
+ local dirname="${LFS}$(dirname "${file}")"
+ mkdir -p "${dirname}"
+
+ install -m 755 "${file}" "${LFS}${QEMU_TARGET_HELPER}"
+ return 0
+ done
+
+ exiterror "Could not find a statically-linked QEMU emulator: ${QEMU_TARGET_HELPER}"
+}
+
+qemu_find_build_helper_name() {
+ local build_arch="${1}"
+
+ local magic
+ case "${build_arch}" in
+ arm*)
+ magic="7f454c4601010100000000000000000002002800"
+ ;;
+ x86_64)
+ magic="7f454c4602010100000000000000000002003e00"
+ ;;
+ esac
+
+ [ -z "${magic}" ] && return 1
+
+ local file
+ for file in /proc/sys/fs/binfmt_misc/*; do
+ # skip write only register entry
+ [ $(basename "${file}") = "register" ] && continue
+ # Search for the file with the correct magic value.
+ grep -qE "^magic ${magic}$" "${file}" || continue
+
+ local interpreter="$(grep "^interpreter" "${file}" | awk '{ print $2 }')"
+
+ [ -n "${interpreter}" ] || continue
+ [ "${interpreter:0:1}" = "/" ] || continue
+ [ -x "${interpreter}" ] || continue
+
+ echo "${interpreter}"
+ return 0
+ done
+
+ return 1
+}
+
+file_is_static() {
+ local file="${1}"
+
+ file ${file} 2>/dev/null | grep -q "statically linked"
+}
+
+enterchroot() {
+ # Install QEMU helper, if needed
+ qemu_install_helper
+
+ local PATH="${TOOLS_DIR}/ccache/bin:/bin:/usr/bin:/sbin:/usr/sbin:${TOOLS_DIR}/bin"
+
+ PATH="${PATH}" chroot ${LFS} env -i \
+ HOME="/root" \
+ TERM="${TERM}" \
+ PS1="${PS1}" \
+ PATH="${PATH}" \
+ SYSTEM_RELEASE="${SYSTEM_RELEASE}" \
+ PAKFIRE_CORE="${PAKFIRE_CORE}" \
+ NAME="${NAME}" \
+ SNAME="${SNAME}" \
+ VERSION="${VERSION}" \
+ CORE="${CORE}" \
+ SLOGAN="${SLOGAN}" \
+ TOOLS_DIR="${TOOLS_DIR}" \
+ CONFIG_ROOT="${CONFIG_ROOT}" \
+ CFLAGS="${CFLAGS} ${HARDENING_CFLAGS}" \
+ CXXFLAGS="${CXXFLAGS} ${HARDENING_CFLAGS}" \
+ BUILDTARGET="${BUILDTARGET}" \
+ CROSSTARGET="${CROSSTARGET}" \
+ BUILD_ARCH="${BUILD_ARCH}" \
+ BUILD_PLATFORM="${BUILD_PLATFORM}" \
+ CCACHE_DIR=/usr/src/ccache \
+ CCACHE_COMPRESS="${CCACHE_COMPRESS}" \
+ CCACHE_COMPILERCHECK="${CCACHE_COMPILERCHECK}" \
+ KVER="${KVER}" \
+ $(fake_environ) \
+ $(qemu_environ) \
+ "$@"
+}
+