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# This file contains utility functions used by rpi23-gen-image.sh
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cleanup (){
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set +x
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set +e
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# Identify and kill all processes still using files
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echo "killing processes using mount point ..."
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fuser -k "${R}"
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sleep 3
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fuser -9 -k -v "${R}"
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# Clean up temporary .password file
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if [ -r ".password" ] ; then
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shred -zu .password
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fi
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# Clean up all temporary mount points
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echo "removing temporary mount points ..."
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umount -l "${R}/proc" 2> /dev/null
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umount -l "${R}/sys" 2> /dev/null
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umount -l "${R}/dev/pts" 2> /dev/null
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umount "$BUILDDIR/mount/boot/firmware" 2> /dev/null
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umount "$BUILDDIR/mount" 2> /dev/null
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cryptsetup close "${CRYPTFS_MAPPING}" 2> /dev/null
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losetup -d "$ROOT_LOOP" 2> /dev/null
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losetup -d "$FRMW_LOOP" 2> /dev/null
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trap - 0 1 2 3 6
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}
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chroot_exec() {
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# Exec command in chroot
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LANG=C LC_ALL=C DEBIAN_FRONTEND=noninteractive chroot "${R}" "$@"
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}
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as_nobody() {
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# Exec command as user nobody
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sudo -E -u nobody LANG=C LC_ALL=C "$@"
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}
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install_readonly() {
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# Install file with user read-only permissions
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install -o root -g root -m 644 "$@"
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}
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install_exec() {
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# Install file with root exec permissions
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install -o root -g root -m 744 "$@"
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}
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use_template () {
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# Test if configuration template file exists
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if [ ! -r "./templates/${CONFIG_TEMPLATE}" ] ; then
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echo "error: configuration template ${CONFIG_TEMPLATE} not found"
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exit 1
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fi
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# Load template configuration parameters
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. "./templates/${CONFIG_TEMPLATE}"
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}
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chroot_install_cc() {
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# Install c/c++ build environment inside the chroot
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if [ -z "${COMPILER_PACKAGES}" ] ; then
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COMPILER_PACKAGES=$(chroot_exec apt-get -s install g++ make bc | grep "^Inst " | awk -v ORS=" " '{ print $2 }')
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# Install COMPILER_PACKAGES in chroot - NEVER do "${COMPILER_PACKAGES}" -> breaks uboot
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chroot_exec apt-get -q -y --allow-unauthenticated --no-install-recommends install ${COMPILER_PACKAGES}
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fi
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}
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chroot_remove_cc() {
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# Remove c/c++ build environment from the chroot
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if [ -n "${COMPILER_PACKAGES}" ] ; then
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chroot_exec apt-get -qq -y --auto-remove purge ${COMPILER_PACKAGES}
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COMPILER_PACKAGES=""
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fi
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}
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# https://serverfault.com/a/682849 - converts e.g. /24 to 255.255.255.0
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cdr2mask ()
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{
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# Number of args to shift, 255..255, first non-255 byte, zeroes
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set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
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[ $1 -gt 1 ] && shift $1 || shift
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echo ${1-0}.${2-0}.${3-0}.${4-0}
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}
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