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build_rootfs
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build_rootfs
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#!/bin/sh
# ------------------------------------------------------------------------------
# build-rootfs.sh - download and configure a minimal rootfs for ev3dev
#
# Must be run as root (use sudo of course!)
# ------------------------------------------------------------------------------
error_out () {
echo "$1"
exit 1
}
if [ "$(whoami)" != "root" ]; then
error_out "Sorry, you are not root."
fi
export DEBIAN_FRONTEND=noninteractive
export DEBCONF_NONINTERACTIVE_SEEN=true
export LC_ALL=C LANGUAGE=C LANG=C
TARGET_ROOTFS_DIR="ev3-rootfs"
# ------------------------------------------------------------------------------
# Make sure were running at the same level as a directory called ev3dev so
# that our directory structure is maintained!
if [ ! -d ../ev3dev ]; then
error_out "Not running at same directory level as ev3dev"
fi
if [ ! -d ../ev3dev-rootfs ]; then
error_out "You need to create or clone ../ev3dev-rootfs first"
fi
# ------------------------------------------------------------------------------
# Download the bare ev3-rootfs directory if we don't already have it
cd ../ev3dev-rootfs
if [ ! -d ${TARGET_ROOTFS_DIR} ]; then
echo "-------------------------------------------------------------------------------"
echo " Downloading a complete grip rootfs from emDebian - this might take a while"
echo " so you might want to tail the multistrap.log file from another shell to keep"
echo " track of progress ... "
echo ""
echo -n " Type \"Yes\" to continue, anything else to skip ... "
read YesNo
if [ "${YesNo}" = "Yes" ]; then
# multistrap -f multistrap.conf > multistrap.log 2>&1
multistrap -f ../ev3dev/multistrap.conf
echo "Done"
echo "-------------------------------------------------------------------------------"
fi
else
echo " Checking for existing ev3-rootfs - already exists!"
fi
cd ${OLDPWD}
# ------------------------------------------------------------------------------
# Configuring the rootfs
cd ../ev3dev-rootfs
echo "-------------------------------------------------------------------------------"
echo " This step will configure the rootfs - it will take a while and overwrite"
echo " any customizations you have done!"
echo ""
echo -n " Type \"Yes\" to continue, anything else to skip ... "
read YesNo
if [ "${YesNo}" = "Yes" ]; then
if [ ! -e ${TARGET_ROOTFS_DIR}/usr/bin/qemu-arm-static ]; then
echo -n " Copying qemu-arm-static to ev3-rootfs/usr/bin ... "
cp /usr/bin/qemu-arm-static ${TARGET_ROOTFS_DIR}/usr/bin
echo " Done"
fi
echo -n " Running the dash.preinst file in ev3-rootfs ... "
chroot ${TARGET_ROOTFS_DIR} var/lib/dpkg/info/dash.preinst install > /dev/null
echo "Done"
echo " Configuring packages in ev3-rootfs - this will take a while!"
chroot ${TARGET_ROOTFS_DIR} dpkg --configure -a
# mount proc -t proc /proc
# dpkg --configure -a
fi
cd ${OLDPWD}
# ------------------------------------------------------------------------------
# Set root password and add users
cd ../ev3dev-rootfs
echo "-------------------------------------------------------------------------------"
echo " This step will set the root password and add the default ev3dev user to the"
echo " sudoer group"
echo ""
echo -n " Type \"Yes\" to continue, anything else to skip ... "
read YesNo
if [ "${YesNo}" = "Yes" ]; then
echo -n " Setting the root password ... "
chroot ev3-rootfs passwd
echo -n " Adding the ev3dev user ... "
chroot ${TARGET_ROOTFS_DIR} useradd -m -G sudo,plugdev,video ev3dev
chroot ${TARGET_ROOTFS_DIR} usermod -s /bin/bash ev3dev
# Additional groups we'll add later...
# netdev,audio,ssh
echo -n " Setting the ev3dev password ... "
chroot ev3-rootfs passwd ev3dev
fi
cd ${OLDPWD}
# ------------------------------------------------------------------------------
# Clean out the apt-cache -no sense keeping it around if we've already
# installed the files!
cd ../ev3dev-rootfs
echo "-------------------------------------------------------------------------------"
echo " Purging unneeded files from the apt-cache..."
chroot ev3-rootfs apt-get purge
chroot ev3-rootfs apt-get clean
chroot ev3-rootfs rm -r /var/lib/apt/lists
chroot ev3-rootfs mkdir -p /var/lib/apt/lists/partial
echo " done"
cd ${OLDPWD}
# ------------------------------------------------------------------------------
# Customizing the rootfs
cd ../ev3dev-rootfs
#Directories used to mount microSD partitions
for media_dir in "mmc_p1" "data"
do
if [ ! -d ${TARGET_ROOTFS_DIR}/media/${media_dir} ]; then
echo -n " Creating mount directories ... "
mkdir ${TARGET_ROOTFS_DIR}/media/${media_dir}
echo " done"
fi
done
#Set the target board hostname
filename="${TARGET_ROOTFS_DIR}/etc/hostname"
if [ ! -d "${filename}" ]; then
echo -n " Creating "${filename}" ... "
echo "ev3dev" > "${filename}"
echo "done"
fi
#Set the default name server - use Google's DNS for now...
filename="${TARGET_ROOTFS_DIR}/etc/resolv.conf"
if [ ! -d "${filename}" ]; then
echo -n " Creating "${filename}" ... "
echo "nameserver 8.8.8.8" > "${filename}"
echo "nameserver 8.8.8.4" >> "${filename}"
echo "done"
fi
#Set the default network interfaces including wireless
filename="${TARGET_ROOTFS_DIR}/etc/network/interfaces"
if [ ! -d "${filename}" ]; then
echo -n " Creating "${filename}" ... "
echo "auto lo" > $filename
echo "iface lo inet loopback" >> $filename
echo "" >> $filename
echo "allow-hotplug eth0" >> $filename
echo "iface eth0 inet dhcp" >> $filename
echo "hwaddress ether 00:04:25:12:34:56" >> $filename
echo "" >> $filename
echo "auto wlan0" >> $filename
echo "iface wlan0 inet dhcp" >> $filename
echo "done"
fi
#Set a terminal to the debug port
filename="${TARGET_ROOTFS_DIR}/etc/inittab"
echo -n " Updating "${filename}" ... "
sed -n -i -e "/^T0:2345:respawn:\/sbin\/getty -L ttyS1 115200 vt100/ d" \
-e "p" \
"${filename}"
echo "T0:2345:respawn:/sbin/getty -L ttyS1 115200 vt100" >> "${filename}"
echo "done"
#Set how to mount the microSD partitions
filename="${TARGET_ROOTFS_DIR}/etc/fstab"
echo -n " Updating "${filename}" ... "
echo "/dev/mmcblk0p1 /media/mmc_p1 vfat noatime 0 0" > ${filename}
echo "/dev/mmcblk0p2 / ext3 noatime 0 0" >> ${filename}
echo "proc /proc proc defaults 0 0" >> ${filename}
echo "done"
#Set up wpa_supplicant.conf - add your own keys here!!!
filename="${TARGET_ROOTFS_DIR}/etc/wpa_supplicant.conf"
echo -n " Updating "${filename}" ... "
echo "ctrl_interface=/var/run/wpa_supplicant" > ${filename}
echo "#ap_scan=2" >> ${filename}
echo "" >> ${filename}
echo "network={" >> ${filename}
echo " ssid=\"Your SSID Here\"" >> ${filename}
echo " scan_ssid=1" >> ${filename}
echo " proto=WPA RSN" >> ${filename}
echo " key_mgmt=WPA-PSK" >> ${filename}
echo " pairwise=CCMP TKIP" >> ${filename}
echo " group=CCMP TKIP" >> ${filename}
echo " psk=\"Your text key here\"" >> ${filename}
echo "}" >> ${filename}
echo "done"
cd ${OLDPWD}
# ------------------------------------------------------------------------------
# Create the custom issue
cd ../ev3dev-rootfs
filename="${TARGET_ROOTFS_DIR}/etc/issue"
echo -n " Creating "${filename}" ... "
echo " _____ _" > "${filename}"
echo " _____ _|___ / __| | _____ __" >> "${filename}"
echo " / _ \\\\\\ \\\\\\ / / |_ \\\\\\ / _\` |/ _ \\\\\\ \\\\\\ / /" >> "${filename}"
echo " | __/\\\\\\ V / ___) | (_| | __/\\\\\\ V / " >> "${filename}"
echo " \\\\\\___| \\\\\\_/ |____/ \\\\\\__,_|\\\\\\___| \\\\\\_/ " >> "${filename}"
echo "" >> "${filename}"
echo "Debian GNU/Linux 7 on LEGO MINDSTORMS EV3! \\\\n \\\\l" >> "${filename}"
echo "done"
exit
echo "-------------------------------------------------------------------------------"
exit