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How to set up a Raspberry Pi to use as a Subsurface downloader
1) Get an image file for RaspianPi
2) Set up your local network according to https://www.raspberrypi.org/documentation/configuration/wireless/headless.md
You also need to create a file named "ssh" in the boot partition to enable the ssh server. Set the hostname to subsurfacepi
3) apt-get install some more packages. On my pi, the packages listed in downloader_packages are installed, you can install them with
sudo xargs -a downloader_packages apt install
4) Clone the subsurface repository and build it as for any Debian based system: Run build.sh, then cd to the build directory, run
ccamke .
and select SUBSURFACE_TARGET_EXECUTABLE as DownloaderExecutable and make once more
5) Add the following lines to /etc/apache2/sites-available/000-default.conf
ScriptAlias /pi-cgi-bin/ /home/pi/cgi-bin/
<Directory "/home/pi/cgi-bin">
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Require all granted
</Directory>
<Directory "/usr/lib/cgi-bin">
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
</Directory>
and restart apache2
6) copy ~/src/subsurface/scripts/downloader.pl to /usr/lib/cgi-bin and run
sudo chmod a+x /usr/lib/cgi-bin/downloader.pl
It should then be there when you direct your browser to
subsurfacepi.local/cgi-bin/downloader.pl
7) Give the www user access to the serial interface
sudo adduser pi dialout
and restart apache2
8) Create a directory to store the data
sudo mkdir /opt/ssrf/
sudo touch /opt/ssrf/ssrf.conf
sudo chown -R www-data.www-data /opt/ssrf
9) If you want to use the pi with an iPhone where the iPhone provides the internet connectivity, follow https://gist.github.com/antronic/157e047cdefa98b3150195c2eacb56b8
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