Image builder for Cadus Life Sensor / remo2hbo / oktopus sensor computer

diff --git a/oktopus.mk b/oktopus.mk
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+## Choose only on of the possible target types
+# image=disk.img
+# squash=rootfs.squash
+raspi=oktopus.img
+
+## Image size in MB. Needs to be able to hold all software.
+imagesize=1792
+
+## Additional packages
+packages=python-tk,python-spidev,python-pygame,python-bluez,python-rpi.gpio,ckermit
+
+## Debian release, so far only stretch has been tested
+release=stretch
+
+## Comma separated list of config modules from modules/ directory
+modules=approx,remo2hbo,autoresize
+
+## Hostname for the generated machine
+hostname=oktopus
+
+## Root password will be salted and encrypted in image
+rootpass=plasmakocher
+
+## The corresponding .pub file for the given rootkey will be applied as
+## SSH login file for the root user.
+## If the pub file is not found, a new key pair will be generated
+# rootkey=image_ssh
+rootkey=oktopus
+
+## Comma separated list of users to be set up.
+## User logins will start out with an empty password
+## If the live module is in use, users will also be added to the sudo group
+# users=adam,steve
+
+## Wifi configuration, if a Wifi password is given, WPA encryption will be used
+## without the password, the system will try to connect to an open wifi
+#wifi=berlin.freifunk.net
+# wifi=MyWiFi
+# wifipass=P4ssW0rD
+wifi="funky Kater"
+wifipass="katerholzig"
+
+## Timezone as offered by Debians tzdata selection
+timezone=Europe/Berlin
+
+## Comma separated list of locales, first one will become default locale
+locales=en_US.UTF-8
+
+## If nodm is installed, you can choose a user to login automatically
+## If no user is given here, then nodm will default to root
+
+## In nodm, use full screen chromium web browser as session
+webui=http://localhost/
+
+## When using NIS modules the directory server should be given
+# nis_server=nismaster
+
+## If the approxmodule is enabled, then one (and only one) apt-source
+## can be choosen to install packages from
+## See modules/approx.mk if you need more flexibility
+# approx=http://localhost:9000/debian
+
+.PHONY: _oktopus_maskjournal
+_config: _oktopus_maskjournal ${CFGROOT}/opt/demo.py
+
+img_mount/opt/demo.py: oktopus_raspberry/ ${CFGROOT}
+       cp "$</demo3.py" "$@"
+       cp "$</demo4.py" "$@"
+
+oktopus_raspberry/:
+       git clone https://git.tools.f4.htw-berlin.de/sliublin/oktopus_raspberry.git "$@"
+
+_oktopus_maskjournal: ${CFGROOT}
+       mkdir -p "$${CFGROOT}/etc/systemd/system/"
+       ln -sf /dev/null "$${CFGROOT}/etc/systemd/system/systemd-journald.service"
+       ln -sf /dev/null "$${CFGROOT}/etc/systemd/system/systemd-timesyncd.service"