two stage installer test run

dhcpcd.conf

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+#interface wlan0
+#    static ip_address=192.168.12.1/24
+
+hostname
+clientid
+presistent
+option rapid_commit
+option domain_name_servers, domain_name, domain_search, host_name
+option classless_static_routes
+option interface_mtu
+option ntp_servers
+require dhcp_server_identifier
+
+slaac private
+
+profile static_wlan0
+static ip_address=192.168.12.1
+static routers=192.168.12.1
+static domain_name_servers=192.168.12.1
+
+interface wlan0
+fallback static_wlan0

normalrc.local

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+#!/bin/sh -e
+#
+# rc.local
+#
+# This script is executed at the end of each multiuser runlevel.
+# Make sure that the script will "exit 0" on success or any other
+# value on error.
+#
+# In order to enable or disable this script just change the execution
+# bits.
+#
+# By default this script does nothing.
+
+# Print the IP address
+_IP=$(hostname -I) || true
+if [ "$_IP" ]; then
+  printf "My IP address is %s\n" "$_IP"
+fi
+
+exit 0

partialinstall.sh

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+#!/bin/bash
+echo "Sorry. This procedure isn't ready yet, We're working on it! "
+
+echo "--- Part 2: Updates and installation ---"
+echo "--- Updating packages"
+sudo apt --yes update
+sudo apt --yes upgrade
+
+echo "--- Installing packages via apt"
+# needed for the CosmicPi software
+sudo apt --yes install git python-pip htop python-numpy python-matplotlib python-flask mosquitto mosquitto-clients
+
+echo "--- Installing python packages via pip"
+sudo pip  --no-cache-dir install pyserial configparser flask_googlemaps Flask-BasicAuth --extra-index-url https://www.piwheels.hostedpi.com/simple
+#echo "we might need some more packages"
+
+echo "--- Getting executable path"
+EXECPATH="`dirname \"$0\"`"              # relative
+EXECPATH="`( cd \"$EXECPATH\" && pwd )`"  # absolutized and normalized
+if [ -z "$EXECPATH" ] ; then
+  # error; for some reason, the path is not accessible
+  # to the script (e.g. permissions re-evaled after suid)
+  exit 1  # fail
+fi
+echo "$EXECPATH"
+TOREPLACE="PATH_TO_EXECUTABLE"
+
+echo "--- Setting up systemd services"
+sed -i -e "s+$TOREPLACE+$EXECPATH+g" install_files/CosmicPi-mqtt.service
+sed -i -e "s+$TOREPLACE+$EXECPATH+g" install_files/CosmicPi-database_cleaner.service
+sed -i -e "s+$TOREPLACE+$EXECPATH+g" install_files/CosmicPi-detector.service
+sed -i -e "s+$TOREPLACE+$EXECPATH+g" install_files/CosmicPi-UI.service
+sudo cp -f install_files/*.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable CosmicPi-mqtt.service
+sudo systemctl enable CosmicPi-database_cleaner.service
+sudo systemctl enable CosmicPi-detector.service
+sudo systemctl enable CosmicPi-UI.service
+#the ap was already done
+
+echo "--- changing static ip address to 192.168.12.1 ---" 
+cp -f dhcpcd.conf /etc/dhcpcd.conf
+
+echo"--- preventing this script from running next reboot ---"
+cp -f normalrc.local /etc/rc.local
+
+echo "--- Finished setup! Rebooting now ---"
+sleep 10
+sudo reboot now

rebootrc.local

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+#!/bin/sh -e
+#
+# rc.local
+#
+# This script is executed at the end of each multiuser runlevel.
+# Make sure that the script will "exit 0" on success or any other
+# value on error.
+#
+# In order to enable or disable this script just change the execution
+# bits.
+#
+# By default this script does nothing.
+
+# Print the IP address
+_IP=$(hostname -I) || true
+if [ "$_IP" ]; then
+  printf "My IP address is %s\n" "$_IP"
+fi
+
+sudo /home/cosmicpi/cosmicpi-rpi_V1.5/partialinstall.sh
+
+exit 0