Raspi2-3_GenImage Commit - r76:50170a27d411 · Collaboration Tremplin des Sciences

Added: KERNEL_REDUCE - less than 128MB used space, Added: REDUCE_ parameters

Jan Wagner -

r76:50170a27d411

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r76:50170a27d411

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bootstrap.d/99-reduce.sh created 644 +72 0

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	1	#
	2	# Reduce system disk usage
	3	#
	4
	5	# Load utility functions
	6	. ./functions.sh
	7
	8	# Reduce the image size by various operations
	9	if [ "$ENABLE_REDUCE" = true ] ; then
	10	if [ "$REDUCE_APT" = true ] ; then
	11	# Install dpkg configuration file
	12	if [ "$REDUCE_DOC" = true ] \|\| [ "$REDUCE_MAN" = true ] ; then
	13	install_readonly files/dpkg/01nodoc "$R/etc/dpkg/dpkg.cfg.d/01nodoc"
	14	fi
	15
	16	# Install APT configuration files
	17	install_readonly files/apt/02nocache "$R/etc/apt/apt.conf.d/02nocache"
	18	install_readonly files/apt/03compress "$R/etc/apt/apt.conf.d/03compress"
	19	install_readonly files/apt/04norecommends "$R/etc/apt/apt.conf.d/04norecommends"
	20
	21	# Remove APT cache files
	22	rm -fr "$R/var/cache/apt/pkgcache.bin"
	23	rm -fr "$R/var/cache/apt/srcpkgcache.bin"
	24	fi
	25
	26	# Remove all doc files
	27	if [ "$REDUCE_DOC" = true ] ; then
	28	find "$R/usr/share/doc" -depth -type f ! -name copyright \| xargs rm \|\| true
	29	find "$R/usr/share/doc" -empty \| xargs rmdir \|\| true
	30	fi
	31
	32	# Remove all man pages and info files
	33	if [ "$REDUCE_MAN" = true ] ; then
	34	rm -rf "$R/usr/share/man" "$R/usr/share/groff" "$R/usr/share/info" "$R/usr/share/lintian" "$R/usr/share/linda" "$R/var/cache/man"
	35	fi
	36
	37	# Remove all locale translation files
	38	if [ "$REDUCE_LOCALE" = true ] ; then
	39	find "$R/usr/share/locale" -mindepth 1 -maxdepth 1 ! -name 'en' \| xargs rm -r
	40	fi
	41
	42	# Remove hwdb PCI device classes (experimental)
	43	if [ "$REDUCE_HWDB" = true ] ; then
	44	rm -fr "/lib/udev/hwdb.d/20-pci-*"
	45	fi
	46
	47	# Replace bash shell by dash shell (experimental)
	48	if [ "$REDUCE_BASH" = true ] ; then
	49	echo "Yes, do as I say!" \| chroot_exec apt-get purge -qq -y --force-yes bash
	50	chroot_exec update-alternatives --install /bin/bash bash /bin/dash 100
	51	fi
	52
	53	# Remove sound utils and libraries
	54	if [ "$ENABLE_SOUND" = false ] ; then
	55	chroot_exec apt-get -qq -y --force-yes purge alsa-utils libsamplerate0 libasound2 libasound2-data
	56	fi
	57
	58	# Re-install tools for managing kernel moduless
	59	chroot_exec apt-get -qq -y --force-yes install module-init-tools
	60
	61	# Remove GPU kernels
	62	if [ "$ENABLE_MINGPU" = true ] ; then
	63	rm -f "$R/boot/firmware/start.elf"
	64	rm -f "$R/boot/firmware/fixup.dat"
	65	rm -f "$R/boot/firmware/start_x.elf"
	66	rm -f "$R/boot/firmware/fixup_x.dat"
	67	fi
	68
	69	# Clean APT list of repositories
	70	rm -fr "$R/var/lib/apt/lists/*"
	71	chroot_exec apt-get -qq -y update
	72	fi

README.md +31 -1

             # rpi2-gen-image
             ## Introduction
             `rpi2-gen-image.sh` is an advanced Debian Linux bootstrapping shell script for generating Debian OS images for the Raspberry 2 (RPi2) computer. The script at this time only supports the bootstrapping of the current stable Debian 8 "jessie" release.
             ## Build dependencies
             The following list of Debian packages must be installed on the build system because they are essentially required for the bootstrapping process. The script will check if all required packages are installed and missing packages will be installed automatically if confirmed by the user.
               ```debootstrap debian-archive-keyring qemu-user-static binfmt-support dosfstools rsync bmap-tools whois git-core```
             ## Command-line parameters
             The script accepts certain command-line parameters to enable or disable specific OS features, services and configuration settings. These parameters are passed to the `rpi2-gen-image.sh` script via (simple) shell-variables. Unlike environment shell-variables (simple) shell-variables are defined at the beginning of the command-line call of the `rpi2-gen-image.sh` script.
             #####Command-line examples:
             ```shell
             ENABLE_UBOOT=true ./rpi2-gen-image.sh
             ENABLE_CONSOLE=false ENABLE_IPV6=false ./rpi2-gen-image.sh
             ENABLE_WM=xfce4 ENABLE_FBTURBO=true ENABLE_MINBASE=true ./rpi2-gen-image.sh
             ENABLE_HARDNET=true ENABLE_IPTABLES=true /rpi2-gen-image.sh
             APT_SERVER=ftp.de.debian.org APT_PROXY="http://127.0.0.1:3142/" ./rpi2-gen-image.sh
             ENABLE_MINBASE=true ./rpi2-gen-image.sh
             BUILD_KERNEL=true ENABLE_MINBASE=true ENABLE_IPV6=false ./rpi2-gen-image.sh
             BUILD_KERNEL=true KERNELSRC_DIR=/tmp/linux ./rpi2-gen-image.sh
             ENABLE_MINBASE=true ENABLE_REDUCE=true ENABLE_MINGPU=true BUILD_KERNEL=true ./rpi2-gen-image.sh
             ```
             #### APT settings:
             ##### `APT_SERVER`="ftp.debian.org"
             Set Debian packages server address. Choose a server from the list of Debian worldwide [mirror sites](https://www.debian.org/mirror/list). Using a nearby server will probably speed-up all required downloads within the bootstrapping process.
             ##### `APT_PROXY`=""
             Set Proxy server address. Using a local Proxy-Cache like `apt-cacher-ng` will speed-up the bootstrapping process because all required Debian packages will only be downloaded from the Debian mirror site once.
             ##### `APT_INCLUDES`=""
             A comma seperated list of additional packages to be installed during bootstrapping.
             #### General system settings:
             ##### `HOSTNAME`="rpi2-jessie"
             Set system host name. It's recommended that the host name is unique in the corresponding subnet.
             ##### `PASSWORD`="raspberry"
             Set system `root` password. The same password is used for the created user `pi`. It's **STRONGLY** recommended that you choose a custom password.
             ##### `DEFLOCAL`="en_US.UTF-8"
             Set default system locale. This setting can also be changed inside the running OS using the `dpkg-reconfigure locales` command. The script variant `minbase` (ENABLE_MINBASE=true) doesn't install `locales`.
             ##### `TIMEZONE`="Europe/Berlin"
             Set default system timezone. All available timezones can be found in the `/usr/share/zoneinfo/` directory. This setting can also be changed inside the running OS using the `dpkg-reconfigure tzdata` command.
             ##### `EXPANDROOT`=true
             Expand the root partition and filesystem automatically on first boot.
             #### Keyboard settings:
             These options are used to configure keyboard layout in `/etc/default/keyboard` for console and Xorg. These settings can also be changed inside the running OS using the `dpkg-reconfigure keyboard-configuration` command.
             ##### `XKB_MODEL`=""
             Set the name of the model of your keyboard type.
             ##### `XKB_LAYOUT`=""
             Set the supported keyboard layout(s).
             ##### `XKB_VARIANT`=""
             Set the supported variant(s) of the keyboard layout(s).
             ##### `XKB_OPTIONS`=""
             Set extra xkb configuration options.
             #### Networking settings (DHCP):
             This setting is used to set up networking auto configuration in `/etc/systemd/network/eth.network`.
             #####`ENABLE_DHCP`=true
             Set the system to use DHCP. This requires an DHCP server.
             #### Networking settings (static):
             These settings are used to set up a static networking configuration in /etc/systemd/network/eth.network. The following static networking settings are only supported if `ENABLE_DHCP` was set to `false`.
             #####`NET_ADDRESS`=""
             Set a static IPv4 or IPv6 address and its prefix, separated by "/", eg. "192.169.0.3/24".
             #####`NET_GATEWAY`=""
             Set the IP address for the default gateway.
             #####`NET_DNS_1`=""
             Set the IP address for the first DNS server.
             #####`NET_DNS_2`=""
             Set the IP address for the second DNS server.
             #####`NET_DNS_DOMAINS`=""
             Set the default DNS search domains to use for non fully qualified host names.
             #####`NET_NTP_1`=""
             Set the IP address for the first NTP server.
             #####`NET_NTP_2`=""
             Set the IP address for the second NTP server.
             #### Basic system features:
             ##### `ENABLE_CONSOLE`=true
             Enable serial console interface. Recommended if no monitor or keyboard is connected to the RPi2. In case of problems fe. if the network (auto) configuration failed - the serial console can be used to access the system.
             ##### `ENABLE_IPV6`=true
             Enable IPv6 support. The network interface configuration is managed via systemd-networkd.
             ##### `ENABLE_SSHD`=true
             Install and enable OpenSSH service. The default configuration of the service doesn't allow `root` to login. Please use the user `pi` instead and `su -` or `sudo` to execute commands as root.
             ##### `ENABLE_RSYSLOG`=true
             If set to false, disable and uninstall rsyslog (so logs will be available only
             in journal files)
             ##### `ENABLE_SOUND`=true
             Enable sound hardware and install Advanced Linux Sound Architecture.
             ##### `ENABLE_HWRANDOM`=true
             Enable Hardware Random Number Generator. Strong random numbers are important for most network based communications that use encryption. It's recommended to be enabled.
             ##### `ENABLE_MINGPU`=false
             Minimize the amount of shared memory reserved for the GPU. It doesn't seem to be possible to fully disable the GPU.
             ##### `ENABLE_DBUS`=true
             Install and enable D-Bus message bus. Please note that systemd should work without D-bus but it's recommended to be enabled.
             ##### `ENABLE_XORG`=false
             Install Xorg open-source X Window System.
             ##### `ENABLE_WM`=""
             Install a user defined window manager for the X Window System. To make sure all X related package dependencies are getting installed `ENABLE_XORG` will automatically get enabled if `ENABLE_WM` is used. The `rpi2-gen-image.sh` script has been tested with the following list of window managers: `blackbox`, `openbox`, `fluxbox`, `jwm`, `dwm`, `xfce4`, `awesome`.
             #### Advanced system features:
             ##### `ENABLE_MINBASE`=false
             Use debootstrap script variant `minbase` which only includes essential packages and apt. This will reduce the disk usage by about 65 MB.
             ##### `ENABLE_REDUCE`=false
-            Reduce the disk usage by deleting all man pages and doc files (harsh). APT will be configured to use compressed package repository lists and no package caching files. If `ENABLE_MINGPU`=true unnecessary start.elf and fixup.dat files will also be removed from the boot partition. This will make it possible to generate output OS images with about 160MB of used disk space. It's recommended to use this parameter in combination with `ENABLE_MINBASE`=true.
+            Reduce the disk usage by deleting packages and files. See `REDUCE_*` parameters for detailed information.
             ##### `ENABLE_UBOOT`=false
             Replace default RPi2 second stage bootloader (bootcode.bin) with U-Boot bootloader. U-Boot can boot images via the network using the BOOTP/TFTP protocol.
             ##### `ENABLE_FBTURBO`=false
             Install and enable the hardware accelerated Xorg video driver `fbturbo`. Please note that this driver is currently limited to hardware accelerated window moving and scrolling.
             ##### `ENABLE_IPTABLES`=false
             Enable iptables IPv4/IPv6 firewall. Simplified ruleset: Allow all outgoing connections. Block all incoming connections except to OpenSSH service.
             ##### `ENABLE_USER`=true
             Create pi user with password raspberry
             ##### `ENABLE_ROOT`=true
             Set root user password so root login will be enabled
             ##### `ENABLE_ROOT_SSH`=true
             Enable password root login via SSH. May be a security risk with default
             password, use only in trusted environments.
             ##### `ENABLE_HARDNET`=false
             Enable IPv4/IPv6 network stack hardening settings.
             ##### `ENABLE_SPLITFS`=false
             Enable having root partition on an USB drive by creating two image files: one for the `/boot/firmware` mount point, and another for `/`.
             ##### `CHROOT_SCRIPTS`=""
             Path to a directory with scripts that should be run in the chroot before the image is finally built. Every executable file in this direcory is run in lexicographical order.
             #### Kernel compilation:
             ##### `BUILD_KERNEL`=false
             Build and install the latest RPi2 Linux kernel. Currently only the default RPi2 kernel configuration is used. Detailed configuration parameters for customizing the kernel and minor bug fixes still need to get implemented. feel free to help.
+            ##### `KERNEL_REDUCE`=false
+            Reduce the size of the generated kernel by removing unwanted device, network and filesystem drivers (experimental).
             ##### `KERNEL_THREADS`=1
             Number of parallel kernel building threads. If the parameter is left untouched the script will automatically determine the number of CPU cores to set the number of parallel threads to speed the kernel compilation.
             ##### `KERNEL_HEADERS`=true
             Install kernel headers with built kernel.
             ##### `KERNEL_MENUCONFIG`=false
             Start `make menuconfig` interactive menu-driven kernel configuration. The script will continue after `make menuconfig` was terminated.
             ##### `KERNEL_REMOVESRC`=true
             Remove all kernel sources from the generated OS image after it was built and installed.
             ##### `KERNELSRC_DIR`=""
             Path to a directory of [RaspberryPi Linux kernel sources](https://github.com/raspberrypi/linux) that will be copied, configured, build and installed inside the chroot.
             ##### `KERNELSRC_CLEAN`=false
             Clean the existing kernel sources directory `KERNELSRC_DIR` (using `make mrproper`) after it was copied to the chroot and before the compilation of the kernel has started. This setting will be ignored if no `KERNELSRC_DIR` was specified or if `KERNELSRC_PREBUILT`=true.
             ##### `KERNELSRC_CONFIG`=true
             Run `make bcm2709_defconfig` (and optional `make menuconfig`) to configure the kernel sources before building. This setting is automatically set to `true` if no existing kernel sources directory was specified using `KERNELSRC_DIR`. This settings is ignored if `KERNELSRC_PREBUILT`=true.
             ##### `KERNELSRC_PREBUILT`=false
             With this parameter set to true the script expects the existing kernel sources directory to be already successfully cross-compiled. The parameters `KERNELSRC_CLEAN`, `KERNELSRC_CONFIG` and `KERNEL_MENUCONFIG` are ignored and no kernel compilation tasks are performed.
+            #### Reduce disk usage:
+            The following list of parameters is ignored if `ENABLE_REDUCE`=false.
+            ##### `REDUCE_APT`=true
+            Configure APT to use compressed package repository lists and no package caching files.
+            ##### `REDUCE_DOC`=true
+            Remove all doc files (harsh). Configure APT to not include doc files on future `apt-get` package installations.
+            ##### `REDUCE_MAN`=true
+            Remove all man pages and info files (harsh).  Configure APT to not include man pages on future `apt-get` package installations.
+            ##### `REDUCE_VIM`=true
+            Replace `vim-tiny` package by `levee` a tiny vim clone.
+            ##### `REDUCE_BASH`=false
+            Remove `bash` package and switch to `dash` shell (experimental).
+            ##### `REDUCE_HWDB`=true
+            Remove PCI related hwdb files (experimental).
+            ##### `REDUCE_SSHD`=true
+            Replace `openssh-server` with dropbear.
+            ##### `REDUCE_LOCALE`=true
+            Remove all `locale` translation files.
             ## Understanding the script
             The functions of this script that are required for the different stages of the bootstrapping are split up into single files located inside the `bootstrap.d` directory. During the bootstrapping every script in this directory gets executed in lexicographical order:
             | Script | Description |
             | --- | --- |
             | `10-bootstrap.sh` | Debootstrap basic system |
             | `11-apt.sh` | Setup APT repositories |
             | `12-locale.sh` | Setup Locales and keyboard settings |
             | `13-kernel.sh` | Build and install RPi2 Kernel |
             | `20-networking.sh` | Setup Networking |
             | `21-firewall.sh` | Setup Firewall |
             | `30-security.sh` | Setup Users and Security settings |
             | `31-logging.sh` | Setup Logging |
             | `41-uboot.sh` | Build and Setup U-Boot |
             | `42-fbturbo.sh` | Build and Setup fbturbo Xorg driver |
             | `50-firstboot.sh` | First boot actions |
             All the required configuration files that will be copied to the generated OS image are located inside the `files` directory. It is not recommended to modify these configuration files manually.
             | Directory | Description |
             | --- | --- |
             | `boot` | Boot and RPi2 configuration files |
             | `dpkg` | Package Manager configuration |
             | `firstboot` | Scripts that get executed on first boot  |
             | `iptables` | Firewall configuration files |
             | `locales` | Locales configuration |
             | `modules` | Kernel Modules configuration |
             | `mount` | Fstab configuration |
             | `network` | Networking configuration files |
             | `sysctl.d` | Swapping and Network Hardening configuration |
             | `xorg` | fbturbo Xorg driver configuration |
             ## Logging of the bootstrapping process
             All information related to the bootstrapping process and the commands executed by the `rpi2-gen-image.sh` script can easily be saved into a logfile. The common shell command `script` can be used for this purpose:
             ```shell
             script -c 'APT_SERVER=ftp.de.debian.org ./rpi2-gen-image.sh' ./build.log
             ```
             ## Flashing the image file
             After the image file was successfully created by the `rpi2-gen-image.sh` script it can be copied to the microSD card that will be used by the RPi2 computer. This can be performed by using the tools `bmaptool` or `dd`. Using `bmaptool` will probably speed-up the copy process because `bmaptool` copies more wisely than `dd`.
             #####Flashing examples:
             ```shell
             bmaptool copy ./images/jessie/2015-12-13-debian-jessie.img /dev/mmcblk0
             dd bs=4M if=./images/jessie/2015-12-13-debian-jessie.img of=/dev/mmcblk0
             ```
             If you have set `ENABLE_SPLITFS`, copy the `-frmw` image on the microSD card, then the `-root` one on the USB drive:
             ```shell
             bmaptool copy ./images/jessie/2015-12-13-debian-jessie-frmw.img /dev/mmcblk0
             bmaptool copy ./images/jessie/2015-12-13-debian-jessie-root.img /dev/sdc
             ```

bootstrap.d/10-bootstrap.sh +1 -1

             #
             # Debootstrap basic system
             #
             # Load utility functions
             . ./functions.sh
             # Base debootstrap (unpack only)
             if [ "$ENABLE_MINBASE" = true ] ; then
-              http_proxy=${APT_PROXY} debootstrap --arch="${RELEASE_ARCH}" --variant=minbase --foreign --include="${APT_INCLUDES}" "${RELEASE}" "$R" "http://${APT_SERVER}/debian"
+              http_proxy=${APT_PROXY} debootstrap --arch="${RELEASE_ARCH}" --foreign --variant=minbase --include="${APT_INCLUDES}" "${RELEASE}" "$R" "http://${APT_SERVER}/debian"
             else
               http_proxy=${APT_PROXY} debootstrap --arch="${RELEASE_ARCH}" --foreign --include="${APT_INCLUDES}" "${RELEASE}" "$R" "http://${APT_SERVER}/debian"
             fi
             # Copy qemu emulator binary to chroot
             cp "${QEMU_BINARY}" "$R/usr/bin"
             # Copy debian-archive-keyring.pgp
             mkdir -p "$R/usr/share/keyrings"
             cp /usr/share/keyrings/debian-archive-keyring.gpg "$R/usr/share/keyrings/debian-archive-keyring.gpg"
             # Complete the bootstrapping process
             chroot_exec /debootstrap/debootstrap --second-stage
             # Mount required filesystems
             mount -t proc none "$R/proc"
             mount -t sysfs none "$R/sys"
             mount --bind /dev/pts "$R/dev/pts"

bootstrap.d/13-kernel.sh +38 -1

             #
             # Build and Setup RPi2 Kernel
             #
             # Load utility functions
             . ./functions.sh
             # Fetch and build latest raspberry kernel
             if [ "$BUILD_KERNEL" = true ] ; then
               # Setup source directory
               mkdir -p "$R/usr/src"
               # Copy existing kernel sources into chroot directory
               if [ -n "$KERNELSRC_DIR" ] && [ -d "$KERNELSRC_DIR" ] ; then
                 # Copy kernel sources
                 cp -r "${KERNELSRC_DIR}" "${R}/usr/src"
                 # Clean the kernel sources
                 if [ "$KERNELSRC_CLEAN" = true ] && [ "$KERNELSRC_PREBUILT" = false ] ; then
                   make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" mrproper
                 fi
               else # KERNELSRC_DIR=""
                 # Fetch current raspberrypi kernel sources
                 git -C "$R/usr/src" clone --depth=1 https://github.com/raspberrypi/linux
               fi
               # Calculate optimal number of kernel building threads
               if [ "$KERNEL_THREADS" = "1" ] && [ -r /proc/cpuinfo ] ; then
                 KERNEL_THREADS=$(grep -c processor /proc/cpuinfo)
               fi
+              # Configure and build kernel
               if [ "$KERNELSRC_PREBUILT" = false ] ; then
+                # Remove device, network and filesystem drivers from kernel configuration
+                if [ "$KERNEL_REDUCE" = true ] ; then
+                  make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
+                  sed -i\
+                  -e "s/\(^CONFIG_SND.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_SOUND.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_AC97.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_VIDEO_.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_MEDIA_TUNER.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_DVB.*\=\)[ym]/\1n/"\
+                  -e "s/\(^CONFIG_REISERFS.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_JFS.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_XFS.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_GFS2.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_OCFS2.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_BTRFS.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_HFS.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_JFFS2.*\=\)[ym]/\1n/"\
+                  -e "s/\(^CONFIG_UBIFS.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_SQUASHFS.*\=\)[ym]/\1n/"\
+                  -e "s/\(^CONFIG_W1.*\=\)[ym]/\1n/"\
+                  -e "s/\(^CONFIG_HAMRADIO.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_CAN.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_IRDA.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_BT_.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_WIMAX.*\=\)[ym]/\1n/"\
+                  -e "s/\(^CONFIG_6LOWPAN.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_IEEE802154.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_NFC.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_FB_TFT=.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_TOUCHSCREEN.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_USB_GSPCA_.*\=\).*/\1n/"\
+                  -e "s/\(^CONFIG_DRM.*\=\).*/\1n/"\
+                  "$R/usr/src/linux/.config"
+                fi
                 if [ "$KERNELSRC_CONFIG" = true ] ; then
                   # Load default raspberry kernel configuration
                   make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" "${KERNEL_DEFCONFIG}"
                   # Start menu-driven kernel configuration (interactive)
                   if [ "$KERNEL_MENUCONFIG" = true ] ; then
                     make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" menuconfig
                   fi
                 fi
                 # Cross compile kernel and modules
                 make -C "$R/usr/src/linux" -j${KERNEL_THREADS} ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" zImage modules dtbs
               fi
               # Check if kernel compilation was successful
               if [ ! -r "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/zImage" ] ; then
                 echo "error: kernel compilation failed! (zImage not found)"
                 cleanup
                 exit 1
               fi
               # Install kernel modules
               if [ "$ENABLE_REDUCE" = true ] ; then
                 make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=../../.. modules_install
               else
                 make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_MOD_PATH=../../.. modules_install
                 # Install kernel firmware
                 make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_FW_PATH=../../../lib firmware_install
               fi
               # Install kernel headers
-              if [ "$KERNEL_HEADERS" = true ] ; then
+              if [ "$KERNEL_HEADERS" = true ] && [ "$KERNEL_REDUCE" = false ] ; then
                 make -C "$R/usr/src/linux" ARCH="${KERNEL_ARCH}" CROSS_COMPILE="${CROSS_COMPILE}" INSTALL_HDR_PATH=../.. headers_install
               fi
               # Prepare boot (firmware) directory
               mkdir "$R/boot/firmware/"
               # Get kernel release version
               KERNEL_VERSION=`cat "$R/usr/src/linux/include/config/kernel.release"`
               # Copy kernel configuration file to the boot directory
               cp "$R/usr/src/linux/.config" "$R/boot/config-${KERNEL_VERSION}"
               # Copy dts and dtb device tree sources and binaries
               mkdir "$R/boot/firmware/overlays/"
               cp "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/"*.dtb "$R/boot/firmware/"
               cp "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/overlays/"*.dtb* "$R/boot/firmware/overlays/"
               cp "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/dts/overlays/README" "$R/boot/firmware/overlays/"
               # Convert kernel zImage and copy it to the boot directory
               "$R/usr/src/linux/scripts/mkknlimg" "$R/usr/src/linux/arch/${KERNEL_ARCH}/boot/zImage" "$R/boot/firmware/kernel7.img"
               # Remove kernel sources
               if [ "$KERNEL_REMOVESRC" = true ] ; then
                 rm -fr "$R/usr/src/linux"
               fi
               # Install raspberry bootloader and flash-kernel packages
               chroot_exec apt-get -qq -y --no-install-recommends install raspberrypi-bootloader-nokernel
             else # BUILD_KERNEL=false
               # Kernel installation
               chroot_exec apt-get -qq -y --no-install-recommends install linux-image-"${COLLABORA_KERNEL}" raspberrypi-bootloader-nokernel
               # Install flash-kernel last so it doesn't try (and fail) to detect the platform in the chroot
               chroot_exec apt-get -qq -y install flash-kernel
               VMLINUZ="$(ls -1 $R/boot/vmlinuz-* | sort | tail -n 1)"
               [ -z "$VMLINUZ" ] && exit 1
               cp "$VMLINUZ" "$R/boot/firmware/kernel7.img"
             fi
             # Setup firmware boot cmdline
             if [ "$ENABLE_SPLITFS" = true ] ; then
               CMDLINE="dwc_otg.lpm_enable=0 root=/dev/sda1 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
             else
               CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
             fi
             # Add serial console support
             if [ "$ENABLE_CONSOLE" = true ] ; then
               CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
             fi
             # Remove IPv6 networking support
             if [ "$ENABLE_IPV6" = false ] ; then
               CMDLINE="${CMDLINE} ipv6.disable=1"
             fi
             # Install firmware boot cmdline
             echo "${CMDLINE}" > "$R/boot/firmware/cmdline.txt"
             # Install firmware config
             install_readonly files/boot/config.txt "$R/boot/firmware/config.txt"
             # Setup minimal GPU memory allocation size: 16MB (no X)
             if [ "$ENABLE_MINGPU" = true ] ; then
               echo "gpu_mem=16" >> "$R/boot/firmware/config.txt"
             fi
             # Create firmware configuration and cmdline symlinks
             ln -sf firmware/config.txt "$R/boot/config.txt"
             ln -sf firmware/cmdline.txt "$R/boot/cmdline.txt"
             # Install and setup kernel modules to load at boot
             mkdir -p "$R/lib/modules-load.d/"
             install_readonly files/modules/rpi2.conf "$R/lib/modules-load.d/rpi2.conf"
             # Load hardware random module at boot
             if [ "$ENABLE_HWRANDOM" = true ] ; then
               sed -i "s/^# bcm2708_rng/bcm2708_rng/" "$R/lib/modules-load.d/rpi2.conf"
             fi
             # Load sound module at boot
             if [ "$ENABLE_SOUND" = true ] ; then
               sed -i "s/^# snd_bcm2835/snd_bcm2835/" "$R/lib/modules-load.d/rpi2.conf"
             fi
             # Install kernel modules blacklist
             mkdir -p "$R/etc/modprobe.d/"
             install_readonly files/modules/raspi-blacklist.conf "$R/etc/modprobe.d/raspi-blacklist.conf"
             # Install and setup fstab
             install_readonly files/mount/fstab "$R/etc/fstab"
             if [ "$ENABLE_SPLITFS" = true ] ; then
               sed -i 's/mmcblk0p2/sda1/' "$R/etc/fstab"
             fi
             # Install sysctl.d configuration files
             install_readonly files/sysctl.d/81-rpi-vm.conf "$R/etc/sysctl.d/81-rpi-vm.conf"

bootstrap.d/50-firstboot.sh +1 -1

             #
             # First boot actions
             #
             # Load utility functions
             . ./functions.sh
             # Prepare rc.firstboot script
             cat files/firstboot/10-begin.sh > "$R/etc/rc.firstboot"
             # Ensure openssh server host keys are regenerated on first boot
-            if [ "$ENABLE_SSHD" = true ] ; then
+            if [ "$ENABLE_SSHD" = true ] && [ "$ENABLE_REDUCE" = false ]; then
               cat files/firstboot/21-generate-ssh-keys.sh >> "$R/etc/rc.firstboot"
               rm -f "$R/etc/ssh/ssh_host_*"
             fi
             # Prepare filesystem auto expand
             if [ "$EXPANDROOT" = true ] ; then
               cat files/firstboot/22-expandroot.sh >> "$R/etc/rc.firstboot"
             fi
             # Ensure that dbus machine-id exists
             cat files/firstboot/23-generate-machineid.sh >> "$R/etc/rc.firstboot"
             # Create /etc/resolv.conf symlink
             cat files/firstboot/24-create-resolv-symlink.sh >> "$R/etc/rc.firstboot"
             # Finalize rc.firstboot script
             cat files/firstboot/99-finish.sh >> "$R/etc/rc.firstboot"
             chmod +x "$R/etc/rc.firstboot"
             # Add rc.firstboot script to rc.local
             sed -i '/exit 0/d' "$R/etc/rc.local"
             echo /etc/rc.firstboot >> "$R/etc/rc.local"
             echo exit 0 >> "$R/etc/rc.local"

files/firstboot/24-create-resolv-symlink.sh +10 -1

@@ -1,4 +1,13
1	logger -t "rc.firstboot" "Creating /etc/resolv.conf symlink"	1	logger -t "rc.firstboot" "Creating /etc/resolv.conf symlink"
2	if [ -f "/run/systemd/resolve/resolv.conf" ] ; then	2
		3
		4	# Check if systemd resolve directory exists
		5	if [ -d "/run/systemd/resolve" ] ; then
		6	# Create resolv.conf file if it does not exists
		7	if [ ! -f "/run/systemd/resolve/resolv.conf" ] ; then
		8	touch /run/systemd/resolve/resolv.conf
		9	fi
		10
		11	# Create symlink to /etc/reolv.conf
3	ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf	12	ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
4	fi	13	fi

rpi2-gen-image.sh +77 -95

             #!/bin/sh
             ########################################################################
             # rpi2-gen-image.sh					   ver2a 12/2015
             #
             # Advanced debian "jessie" bootstrap script for RPi2
             #
             # This program is free software; you can redistribute it and/or
             # modify it under the terms of the GNU General Public License
             # as published by the Free Software Foundation; either version 2
             # of the License, or (at your option) any later version.
             #
             # some parts based on rpi2-build-image:
             # Copyright (C) 2015 Ryan Finnie <ryan@finnie.org>
             # Copyright (C) 2015 Luca Falavigna <dktrkranz@debian.org>
             ########################################################################
+            # Are we running as root?
+            if [ "$(id -u)" -ne "0" ] ; then
+              echo "error: this script must be executed with root privileges!"
+              exit 1
+            fi
             # Check if ./functions.sh script exists
             if [ ! -r "./functions.sh" ] ; then
               echo "error: './functions.sh' required script not found. please reinstall the latest script version!"
               exit 1
             fi
             # Load utility functions
             . ./functions.sh
             # Introduce settings
             set -e
             echo -n -e "\n#\n# RPi2 Bootstrap Settings\n#\n"
             set -x
             # Debian release
             RELEASE=${RELEASE:=jessie}
             KERNEL_ARCH=${KERNEL_ARCH:=arm}
             RELEASE_ARCH=${RELEASE_ARCH:=armhf}
             CROSS_COMPILE=${CROSS_COMPILE:=arm-linux-gnueabihf-}
             COLLABORA_KERNEL=${COLLABORA_KERNEL:=3.18.0-trunk-rpi2}
             KERNEL_DEFCONFIG=${KERNEL_DEFCONFIG:=bcm2709_defconfig}
             QEMU_BINARY=${QEMU_BINARY:=/usr/bin/qemu-arm-static}
-            # Build settings
+            # Build directories
             BASEDIR=$(pwd)/images/${RELEASE}
             BUILDDIR=${BASEDIR}/build
+            R=${BUILDDIR}/chroot
             # General settings
             HOSTNAME=${HOSTNAME:=rpi2-${RELEASE}}
             PASSWORD=${PASSWORD:=raspberry}
             DEFLOCAL=${DEFLOCAL:="en_US.UTF-8"}
             TIMEZONE=${TIMEZONE:="Europe/Berlin"}
             EXPANDROOT=${EXPANDROOT:=true}
             # Keyboard settings
             XKB_MODEL=${XKB_MODEL:=""}
             XKB_LAYOUT=${XKB_LAYOUT:=""}
             XKB_VARIANT=${XKB_VARIANT:=""}
             XKB_OPTIONS=${XKB_OPTIONS:=""}
             # Network settings (DHCP)
             ENABLE_DHCP=${ENABLE_DHCP:=true}
             # Network settings (static)
-            # only used on ENABLE_DHCP=false
             NET_ADDRESS=${NET_ADDRESS:=""}
             NET_GATEWAY=${NET_GATEWAY:=""}
             NET_DNS_1=${NET_DNS_1:=""}
             NET_DNS_2=${NET_DNS_2:=""}
             NET_DNS_DOMAINS=${NET_DNS_DOMAINS:=""}
             NET_NTP_1=${NET_NTP_1:=""}
             NET_NTP_2=${NET_NTP_2:=""}
             # APT settings
             APT_PROXY=${APT_PROXY:=""}
             APT_SERVER=${APT_SERVER:="ftp.debian.org"}
             # Feature settings
             ENABLE_CONSOLE=${ENABLE_CONSOLE:=true}
             ENABLE_IPV6=${ENABLE_IPV6:=true}
             ENABLE_SSHD=${ENABLE_SSHD:=true}
             ENABLE_SOUND=${ENABLE_SOUND:=true}
             ENABLE_DBUS=${ENABLE_DBUS:=true}
             ENABLE_HWRANDOM=${ENABLE_HWRANDOM:=true}
             ENABLE_MINGPU=${ENABLE_MINGPU:=false}
             ENABLE_XORG=${ENABLE_XORG:=false}
             ENABLE_WM=${ENABLE_WM:=""}
             ENABLE_RSYSLOG=${ENABLE_RSYSLOG:=true}
             ENABLE_USER=${ENABLE_USER:=true}
             ENABLE_ROOT=${ENABLE_ROOT:=false}
             ENABLE_ROOT_SSH=${ENABLE_ROOT_SSH:=false}
             # Advanced settings
             ENABLE_MINBASE=${ENABLE_MINBASE:=false}
             ENABLE_REDUCE=${ENABLE_REDUCE:=flase}
             ENABLE_UBOOT=${ENABLE_UBOOT:=false}
             ENABLE_FBTURBO=${ENABLE_FBTURBO:=false}
             ENABLE_HARDNET=${ENABLE_HARDNET:=false}
             ENABLE_IPTABLES=${ENABLE_IPTABLES:=false}
             ENABLE_SPLITFS=${ENABLE_SPLITFS:=false}
             # Kernel compilation settings
             BUILD_KERNEL=${BUILD_KERNEL:=false}
+            KERNEL_REDUCE=${KERNEL_REDUCE:=false}
             KERNEL_THREADS=${KERNEL_THREADS:=1}
             KERNEL_HEADERS=${KERNEL_HEADERS:=true}
             KERNEL_MENUCONFIG=${KERNEL_MENUCONFIG:=false}
             KERNEL_REMOVESRC=${KERNEL_REMOVESRC:=true}
             # Kernel compilation from source directory settings
             KERNELSRC_DIR=${KERNELSRC_DIR:=""}
             KERNELSRC_CLEAN=${KERNELSRC_CLEAN:=false}
             KERNELSRC_CONFIG=${KERNELSRC_CONFIG:=true}
             KERNELSRC_PREBUILT=${KERNELSRC_PREBUILT:=false}
-            # Image chroot path
+            # Reduce disk usage settings
-            R=${BUILDDIR}/chroot
+            REDUCE_APT=${REDUCE_APT:=true}
+            REDUCE_DOC=${REDUCE_DOC:=true}
+            REDUCE_MAN=${REDUCE_MAN:=true}
+            REDUCE_VIM=${REDUCE_VIM:=true}
+            REDUCE_BASH=${REDUCE_BASH:=false}
+            REDUCE_HWDB=${REDUCE_HWDB:=true}
+            REDUCE_SSHD=${REDUCE_SSHD:=true}
+            REDUCE_LOCALE=${REDUCE_LOCALE:=true}
+            # Chroot scripts directory
             CHROOT_SCRIPTS=${CHROOT_SCRIPTS:=""}
-            # Packages required for bootstrapping
-            REQUIRED_PACKAGES="debootstrap debian-archive-keyring qemu-user-static binfmt-support dosfstools rsync bmap-tools whois git-core"
-            # Missing packages that need to be installed
-            MISSING_PACKAGES=""
             # Packages required in the chroot build environment
             APT_INCLUDES=${APT_INCLUDES:=""}
             APT_INCLUDES="${APT_INCLUDES},apt-transport-https,apt-utils,ca-certificates,debian-archive-keyring,dialog,sudo"
-            set +x
+            # Packages required for bootstrapping
+            REQUIRED_PACKAGES="debootstrap debian-archive-keyring qemu-user-static binfmt-support dosfstools rsync bmap-tools whois git-core"
-            # Are we running as root?
+            MISSING_PACKAGES=""
-            if [ "$(id -u)" -ne "0" ] ; then
-              echo "error: this script must be executed with root privileges!"
-              exit 1
-            fi
-            # Check if ./bootstrap.d directory exists
-            if [ ! -d "./bootstrap.d/" ] ; then
-              echo "error: './bootstrap.d' required directory not found. please reinstall the latest script version!"
-              exit 1
-            fi
-            # Check if ./files directory exists
-            if [ ! -d "./files/" ] ; then
-              echo "error: './files' required directory not found. please reinstall the latest script version!"
-              exit 1
-            fi
-            # Check if specified KERNELSRC_DIR directory exists
-            if [ -n "$KERNELSRC_DIR" ] && [ ! -d "$KERNELSRC_DIR" ] ; then
-              echo "error: ${KERNELSRC_DIR} (KERNELSRC_DIR) specified directory not found!"
-              exit 1
-            fi
-            # Check if specified CHROOT_SCRIPTS directory exists
+            set +x
-            if [ -n "$CHROOT_SCRIPTS" ] && [ ! -d "$CHROOT_SCRIPTS" ] ; then
-               echo "error: ${CHROOT_SCRIPTS} (CHROOT_SCRIPTS) specified directory not found!"
-               exit 1
-            fi
             # Add packages required for kernel cross compilation
             if [ "$BUILD_KERNEL" = true ] ; then
               REQUIRED_PACKAGES="${REQUIRED_PACKAGES} crossbuild-essential-armhf"
+            fi
-              if [ "$KERNEL_MENUCONFIG" = true ] ; then
+            # Add libncurses5 to enable kernel menuconfig
-                REQUIRED_PACKAGES="${REQUIRED_PACKAGES} ncurses-dev"
+            if [ "$KERNEL_MENUCONFIG" = true ] ; then
-              fi
+              REQUIRED_PACKAGES="${REQUIRED_PACKAGES} libncurses5-dev"
             fi
-            # Check if all required packages are installed
+            # Check if all required packages are installed on the build system
             for package in $REQUIRED_PACKAGES ; do
               if [ "`dpkg-query -W -f='${Status}' $package`" != "install ok installed" ] ; then
                 MISSING_PACKAGES="${MISSING_PACKAGES} $package"
               fi
             done
             # Ask if missing packages should get installed right now
             if [ -n "$MISSING_PACKAGES" ] ; then
               echo "the following packages needed by this script are not installed:"
               echo "$MISSING_PACKAGES"
               echo -n "\ndo you want to install the missing packages right now? [y/n] "
               read confirm
-              if [ "$confirm" != "y" ] ; then
+              [ "$confirm" != "y" ] && exit 1
-                exit 1
-              fi
             fi
             # Make sure all required packages are installed
             apt-get -qq -y install ${REQUIRED_PACKAGES}
+            # Check if ./bootstrap.d directory exists
+            if [ ! -d "./bootstrap.d/" ] ; then
+              echo "error: './bootstrap.d' required directory not found!"
+              exit 1
+            fi
+            # Check if ./files directory exists
+            if [ ! -d "./files/" ] ; then
+              echo "error: './files' required directory not found!"
+              exit 1
+            fi
+            # Check if specified KERNELSRC_DIR directory exists
+            if [ -n "$KERNELSRC_DIR" ] && [ ! -d "$KERNELSRC_DIR" ] ; then
+              echo "error: '${KERNELSRC_DIR}' specified directory not found (KERNELSRC_DIR)!"
+              exit 1
+            fi
+            # Check if specified CHROOT_SCRIPTS directory exists
+            if [ -n "$CHROOT_SCRIPTS" ] && [ ! -d "$CHROOT_SCRIPTS" ] ; then
+               echo "error: ${CHROOT_SCRIPTS} specified directory not found (CHROOT_SCRIPTS)!"
+               exit 1
+            fi
             # Don't clobber an old build
             if [ -e "$BUILDDIR" ] ; then
               echo "error: directory ${BUILDDIR} already exists, not proceeding"
               exit 1
             fi
             # Setup chroot directory
             mkdir -p "$R"
             # Check if build directory has enough of free disk space >512MB
             if [ "$(df --output=avail ${BUILDDIR} | sed "1d")" -le "524288" ] ; then
-              echo "error: ${BUILDDIR} not enough space left on this partition to generate the output image!"
+              echo "error: ${BUILDDIR} not enough space left to generate the output image!"
               exit 1
             fi
-            # Warn if build directory has low free disk space <1024MB
-            if [ "$(df --output=avail ${BUILDDIR} | sed "1d")" -le "1048576" ] ; then
-              echo `df -h --output=avail ${BUILDDIR} | sed "1 s|.*Avail|warning: $partition is low on free space:|"`
-            fi
             set -x
             # Call "cleanup" function on various signals and errors
             trap cleanup 0 1 2 3 6
             # Add required packages for the minbase installation
             if [ "$ENABLE_MINBASE" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},vim-tiny,netbase,net-tools"
             else
               APT_INCLUDES="${APT_INCLUDES},locales,keyboard-configuration,console-setup"
             fi
             # Add parted package, required to get partprobe utility
             if [ "$EXPANDROOT" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},parted"
             fi
             # Add dbus package, recommended if using systemd
             if [ "$ENABLE_DBUS" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},dbus"
             fi
             # Add iptables IPv4/IPv6 package
             if [ "$ENABLE_IPTABLES" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},iptables"
             fi
             # Add openssh server package
             if [ "$ENABLE_SSHD" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},openssh-server"
             fi
             # Add alsa-utils package
             if [ "$ENABLE_SOUND" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},alsa-utils"
             fi
             # Add rng-tools package
             if [ "$ENABLE_HWRANDOM" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},rng-tools"
             fi
             # Add fbturbo video driver
             if [ "$ENABLE_FBTURBO" = true ] ; then
               # Enable xorg package dependencies
               ENABLE_XORG=true
             fi
             # Add user defined window manager package
             if [ -n "$ENABLE_WM" ] ; then
               APT_INCLUDES="${APT_INCLUDES},${ENABLE_WM}"
               # Enable xorg package dependencies
               ENABLE_XORG=true
             fi
             # Add xorg package
             if [ "$ENABLE_XORG" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},xorg"
             fi
-            # Set KERNELSRC_CONFIG=true
+            # Replace selected packages with smaller clones
+            if [ "$ENABLE_REDUCE" = true ] ; then
+              # Add levee package instead of vim-tiny
+              if [ "$REDUCE_VIM" = true ] ; then
+                APT_INCLUDES="$(echo ${APT_INCLUDES} | sed "s/vim-tiny/levee/")"
+              fi
+              # Add dropbear package instead of openssh-server
+              if [ "$REDUCE_SSHD" = true ] ; then
+                APT_INCLUDES="$(echo ${APT_INCLUDES} | sed "s/openssh-server/dropbear/")"
+              fi
+            fi
+            # Configure kernel sources if no KERNELSRC_DIR
             if [ "$BUILD_KERNEL" = true ] && [ -z "$KERNELSRC_DIR" ] ; then
               KERNELSRC_CONFIG=true
             fi
-            ## MAIN bootstrap
+            # Configure reduced kernel
+            if [ "$KERNEL_REDUCE" = true ] ; then
+              KERNELSRC_CONFIG=false
+            fi
+            # Execute bootstrap scripts
             for SCRIPT in bootstrap.d/*.sh; do
-              # Execute bootstrap scripts (lexicographical order)
               head -n 3 "$SCRIPT"
               . "$SCRIPT"
             done
-            ## Custom bootstrap scripts
+            ## Execute custom bootstrap scripts
             if [ -d "custom.d" ] ; then
-              # Execute custom bootstrap scripts (lexicographical order)
               for SCRIPT in custom.d/*.sh; do
                 . "$SCRIPT"
               done
             fi
-            # Invoke custom scripts
+            # Execute custom scripts inside the chroot
             if [ -n "$CHROOT_SCRIPTS" ] && [ -d "$CHROOT_SCRIPTS" ] ; then
               cp -r "${CHROOT_SCRIPTS}" "${R}/chroot_scripts"
-              # Execute scripts inside the chroot (lexicographical order)
               chroot_exec /bin/bash -x <<'EOF'
             for SCRIPT in /chroot_scripts/* ; do
               if [ -f $SCRIPT -a -x $SCRIPT ] ; then
                 $SCRIPT
               fi
             done
             EOF
               rm -rf "$R/chroot_scripts"
             fi
             # Remove apt-utils
             chroot_exec apt-get purge -qq -y --force-yes apt-utils
-            # Reduce the image size by removing and compressing
-            if [ "$ENABLE_REDUCE" = true ] ; then
-              # Install dpkg configuration fragment file
-              install_readonly files/dpkg/01nodoc "$R/etc/dpkg/dpkg.cfg.d/01nodoc"
-              # Install APT configuration fragment files
-              install_readonly files/apt/02nocache "$R/etc/apt/apt.conf.d/02nocache"
-              install_readonly files/apt/03compress "$R/etc/apt/apt.conf.d/03compress"
-              install_readonly files/apt/04norecommends "$R/etc/apt/apt.conf.d/04norecommends"
-              # Remove APT cache files
-              rm -fr "$R/var/cache/apt/pkgcache.bin"
-              rm -fr "$R/var/cache/apt/srcpkgcache.bin"
-              # Remove all doc and man files
-              find "$R/usr/share/doc" -depth -type f ! -name copyright | xargs rm || true
-              find "$R/usr/share/doc" -empty | xargs rmdir || true
-              rm -rf "$R/usr/share/man" "$R/usr/share/groff" "$R/usr/share/info" "$R/usr/share/lintian" "$R/usr/share/linda" "$R/var/cache/man"
-              # Remove all translation files
-              find "$R/usr/share/locale" -mindepth 1 -maxdepth 1 ! -name 'en' | xargs rm -r
-              # Clean APT list of repositories
-              rm -fr "$R/var/lib/apt/lists/*"
-              chroot_exec apt-get -qq -y update
-              # Remove GPU kernels
-              if [ "$ENABLE_MINGPU" = true ] ; then
-                rm -f "$R/boot/firmware/start.elf"
-                rm -f "$R/boot/firmware/fixup.dat"
-                rm -f "$R/boot/firmware/start_x.elf"
-                rm -f "$R/boot/firmware/fixup_x.dat"
-              fi
-            fi
             # APT Cleanup
             chroot_exec apt-get -y clean
             chroot_exec apt-get -y autoclean
             chroot_exec apt-get -y autoremove
             # Unmount mounted filesystems
             umount -l "$R/proc"
             umount -l "$R/sys"
             # Clean up directories
             rm -rf "$R/run"
             rm -rf "$R/tmp/*"
             # Clean up files
             rm -f "$R/etc/apt/sources.list.save"
             rm -f "$R/etc/resolvconf/resolv.conf.d/original"
             rm -f "$R/etc/*-"
             rm -f "$R/root/.bash_history"
             rm -f "$R/var/lib/urandom/random-seed"
             rm -f "$R/var/lib/dbus/machine-id"
             rm -f "$R/etc/machine-id"
             rm -f "$R/etc/apt/apt.conf.d/10proxy"
             rm -f "$R/etc/resolv.conf"
             rm -f "${R}${QEMU_BINARY}"
             # Calculate size of the chroot directory in KB
             CHROOT_SIZE=$(expr `du -s "$R" | awk '{ print $1 }'`)
             # Calculate the amount of needed 512 Byte sectors
             TABLE_SECTORS=$(expr 1 \* 1024 \* 1024 \/ 512)
             FRMW_SECTORS=$(expr 64 \* 1024 \* 1024 \/ 512)
             ROOT_OFFSET=$(expr ${TABLE_SECTORS} + ${FRMW_SECTORS})
             # The root partition is EXT4
             # This means more space than the actual used space of the chroot is used.
             # As overhead for journaling and reserved blocks 20% are added.
             ROOT_SECTORS=$(expr $(expr ${CHROOT_SIZE} + ${CHROOT_SIZE} \/ 100 \* 20) \* 1024 \/ 512)
             # Calculate required image size in 512 Byte sectors
             IMAGE_SECTORS=$(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} + ${ROOT_SECTORS})
             # Prepare date string for image file name
             DATE="$(date +%Y-%m-%d)"
             # Prepare image file
             if [ "$ENABLE_SPLITFS" = true ] ; then
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" bs=512 count=${TABLE_SECTORS}
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" bs=512 count=0 seek=${FRMW_SECTORS}
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-root.img" bs=512 count=${TABLE_SECTORS}
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-root.img" bs=512 count=0 seek=${ROOT_SECTORS}
               # Write partition tables
               sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" <<EOM
             unit: sectors
 : start=   ${TABLE_SECTORS}, size=   ${FRMW_SECTORS}, Id= c, bootable
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
             EOM
               sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}-root.img" <<EOM
             unit: sectors
 : start=   ${TABLE_SECTORS}, size=   ${ROOT_SECTORS}, Id=83
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
             EOM
               # Setup temporary loop devices
               FRMW_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}-frmw.img)"
               ROOT_LOOP="$(losetup -o 1M -f --show $BASEDIR/${DATE}-debian-${RELEASE}-root.img)"
             else
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=512 count=${TABLE_SECTORS}
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=512 count=0 seek=${IMAGE_SECTORS}
               # Write partition table
               sfdisk -q -f "$BASEDIR/${DATE}-debian-${RELEASE}.img" <<EOM
             unit: sectors
 : start=   ${TABLE_SECTORS}, size=   ${FRMW_SECTORS}, Id= c, bootable
 : start=     ${ROOT_OFFSET}, size=   ${ROOT_SECTORS}, Id=83
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
             EOM
               # Setup temporary loop devices
               FRMW_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
               ROOT_LOOP="$(losetup -o 65M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
             fi
             # Build filesystems
             mkfs.vfat "$FRMW_LOOP"
             mkfs.ext4 "$ROOT_LOOP"
             # Mount the temporary loop devices
             mkdir -p "$BUILDDIR/mount"
             mount "$ROOT_LOOP" "$BUILDDIR/mount"
             mkdir -p "$BUILDDIR/mount/boot/firmware"
             mount "$FRMW_LOOP" "$BUILDDIR/mount/boot/firmware"
             # Copy all files from the chroot to the loop device mount point directory
             rsync -a "$R/" "$BUILDDIR/mount/"
             # Unmount all temporary loop devices and mount points
             cleanup
             # Create block map file(s) of image(s)
             if [ "$ENABLE_SPLITFS" = true ] ; then
               # Create block map files for "bmaptool"
               bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img"
               bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}-root.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}-root.img"
               # Image was successfully created
               echo "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img ($(expr \( ${TABLE_SECTORS} + ${FRMW_SECTORS} \) \* 512 \/ 1024 \/ 1024)M)" ": successfully created"
               echo "$BASEDIR/${DATE}-debian-${RELEASE}-root.img ($(expr \( ${TABLE_SECTORS} + ${ROOT_SECTORS} \) \* 512 \/ 1024 \/ 1024)M)" ": successfully created"
             else
               # Create block map file for "bmaptool"
               bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}.img"
               # Image was successfully created
               echo "$BASEDIR/${DATE}-debian-${RELEASE}.img ($(expr \( ${TABLE_SECTORS} + ${FRMW_SECTORS} + ${ROOT_SECTORS} \) \* 512 \/ 1024 \/ 1024)M)" ": successfully created"
             fi

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