272 lines
11 KiB
Org Mode
272 lines
11 KiB
Org Mode
#+TITLE:
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#+AUTHOR: Bob Mottram
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#+EMAIL: bob@freedombone.net
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#+KEYWORDS: freedombox, debian, beaglebone, red matrix, email, web server, home server, internet, censorship, surveillance, social network, irc, jabber
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#+DESCRIPTION: Turn the Beaglebone Black into a personal communications server
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#+OPTIONS: ^:nil toc:nil
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="freedombone.css" />
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#+BEGIN_CENTER
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[[file:images/logo.png]]
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#+END_CENTER
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#+begin_export html
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<center><h1>Developers Guide</h1></center>
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#+end_export
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* Introduction
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Freedombone consists of a set of bash scripts. There are a lot of them, but they're not very complicated. If you're familiar with the GNU/Linux commandline and can hack a bash script then you can probably add a new app or fix a bug in the system. There are no trendy development frameworks to learn or to get in your way.
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* Community Statement
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This project doesn't require you to take any special pledge of allegiance or subscribe to any guru's list of commandments. It does not care about your gender, race, national flag or political alignment. It is agnostic towards your religion or lack thereof. It doesn't give one hoot as to whether you are young or old, rich or poor, gay, trans, straight or just "other". It does not care if you like your eggs sunny side up or if you are a vegan.
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This is an inclusive project which will take patches or pull requests from anyone, in a generous manner along the lines described by the late Pieter Hintjens in his book /Social Architecture/. Any useful patch is likely to be merged so long as it is submitted under a license compatible with AGPL3. Copyright assignment is not required.
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Freedombone is a free system. That's free as in no secret source. For anything. Although there's nothing to stop you from adding proprietary utilities or apps if you wish, any patches containing closed stuff or which create dependencies upon closed systems will be regarded as trash and ignored.
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This project also has a no bullshit policy. Anyone trying to cause a ruckus by trolling or engaging in behavior which is disruptive or disrespectful to others will be speedily blocked and ignored. Life's too short, and there's too much to be done.
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* Adding extra apps
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Suppose you have some internet application which you want to add to the system. To do this you need to create an app script which tells the system how to install/remove and also backup/restore. The script should be designed to work with the current stable version of Debian.
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On an installed system the app scripts go into the directory:
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#+begin_src bash
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/usr/share/freedombone/apps
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#+end_src
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and within the project repo they appear within the /src/ directory. Your new app script should have the name:
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#+begin_src bash
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freedombone-app-[myappname]
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#+end_src
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The /myappname/ value should not contain any spaces and will appear in the list of available apps.
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An example template for an app script is shown below. Copy this and add whatever variables and configuration you need. Search and replace /myappname/ with your own.
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#+begin_src bash
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#!/bin/bash
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# Copyright (C) Year YourName <YourEmail>
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#
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# This program is free software: you can redistribute it
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# and/or modify it under the terms of the GNU Affero General
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# Public License as published by the Free Software Foundation,
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# either version 3 of the License, or (at your option) any
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# later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# 'full' includes your app in the full installation and you
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# can also add other variants, separated by spaces. The
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# available variants will be detected automatically from the
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# app scripts. In most cases don't change this.
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VARIANTS='full'
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# If you want this to appear on the control panel About screen
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SHOW_ON_ABOUT=1
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# If you want this app to be in the default installation,
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# otherwise it will be available but not selected by default
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IN_DEFAULT_INSTALL=1
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SOME_IMPORTANT_CONFIG_VARIABLE='some important value'
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ANOTHER_IMPORTANT_CONFIG_VARIABLE='foo'
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MY_FUNKY_AVATAR=https://some-domain-or-other/fro.png
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MYAPPNAME_ONION_PORT=[port number]
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MYAPPNAME_DB_PASSWORD=
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# A directory where the data for this app exists
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MYAPP_DATA_DIR=/var/lib/somedirectory
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# List of configuration variables used by the app
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myappname_variables=(ONION_ONLY
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MY_USERNAME
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SOME_IMPORTANT_CONFIG_VARIABLE
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ANOTHER_IMPORTANT_CONFIG_VARIABLE
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MY_FUNKY_AVATAR
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MYAPPNAME_ONION_PORT
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MYAPPNAME_DB_PASSWORD)
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function change_password_myappname {
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PASSWORD_USERNAME="$1"
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PASSWORD_NEW="$2"
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# Do something to change the password
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}
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function reconfigure_myappname {
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echo -n ''
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# Do something to delete existing keys/identity and
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# generate new ones
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}
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function upgrade_myappname {
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echo -n ''
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# Do something to upgrade this app.
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# If it's a debian package then it will be maintained by the
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# operating system and you don't need anything here
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}
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function backup_local_myappname {
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# If your app has a MariaDB/MySQL database
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backup_database_to_usb myappname
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# To backup a directory
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backup_directory_to_usb $MYAPP_DATA_DIR myappname
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# if you need to backup data within individual user
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# home directories
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for d in /home/*/ ; do
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USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
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if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
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echo $"Backing up myappname config for $USERNAME"
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if [ -d /home/$USERNAME/.config/myappname ]; then
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backup_directory_to_usb \
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/home/$USERNAME/.config/myappname \
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myappname_users/$USERNAME
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fi
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fi
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done
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}
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function restore_local_myappname {
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temp_restore_dir=/root/tempmyappname
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# If your app has a MariaDB/MySQL database
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restore_database myappname
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# Restore some data from a directory
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# Note that we don't restore directly but to a temporary
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# directory and then copy the files. This ensures that if
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# there is a restore failure you don't end up with
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# half-copied or corrupted files
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restore_directory_from_usb $MYAPP_DATA_DIR myappname
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cp -r $temp_restore_dir/$MYAPP_DATA_DIR $MYAPP_DATA_DIR
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rm -rf $temp_restore_dir
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# If you need to restore a configuration directory for each user
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if [ -d $USB_MOUNT/backup/myappname_users ]; then
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for d in $USB_MOUNT/backup/myappname_users/*/ ; do
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USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
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if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
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if [ ! -d /home/$USERNAME ]; then
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${PROJECT_NAME}-adduser $USERNAME
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fi
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echo $"Restoring Vim config for $USERNAME"
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function_check restore_directory_from_usb
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restore_directory_from_usb $temp_restore_dir \
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myappname_users/$USERNAME
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cp -r $temp_restore_dir/home/$USERNAME/.config \
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/home/$USERNAME/
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if [ ! "$?" = "0" ]; then
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rm -rf $temp_restore_dir
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set_user_permissions
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backup_unmount_drive
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exit 664
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fi
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rm -rf $temp_restore_dir
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fi
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done
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fi
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}
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function backup_remote_myappname {
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# this should be the same as backup_local_myappname,
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# but call the backup functions backup_directory_to_friend
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# and backup_database_to_friend
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}
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function restore_remote_vim {
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# this should be the same as restore_local_myappname,
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# but call the restore function restore_directory_from_friend
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# and restore_database_from_friend
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}
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function remove_myappname {
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# if it's a debian package then:
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apt-get -y remove --purge [my-app-package-name]
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# If your app has a MariaDB/MySQL database
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drop_database myappname
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# If your app uses an onion address
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remove_onion_service myappname ${MYAPPNAME_ONION_PORT}
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}
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function install_myappname {
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# if it's a debian package then:
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apt-get -y install [my-app-package-name]
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# If you need to create a MariaDB/MySQL database for the app
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MYAPPNAME_DB_PASSWORD="$(create_password 20)"
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create_database myappname "$MYAPPNAME_DB_PASSWORD" $MY_USERNAME
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# If you need to create an onion address for the app
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MYAPPNAME_ONION_HOSTNAME=$(add_onion_service myappname \
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80 ${MYAPPNAME_ONION_PORT})
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# Do any other configuration
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# Here you might use $ONION_ONLY or
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# $SOME_IMPORTANT_CONFIG_VARIABLE
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# Mark the app as having installed successfully
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# If this variable isn't set then it will be assumed that
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# the install has failed
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APP_INSTALLED=1
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}
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function install_interactive_myappname {
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# Interactively obtain some values using dialog, such as
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# domain names. An avatar changing example is:
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data=$(tempfile 2>/dev/null)
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trap "rm -f $data" 0 1 2 5 15
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dialog --title $"Change your avatar" \
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--backtitle $"Freedombone Control Panel" \
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--inputbox $"Enter a URL for an image. It should be " \
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$"approximately a square image." 8 75 2>$data
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sel=$?
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case $sel in
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0)
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MY_FUNKY_AVATAR=$(<$data)
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if [ ${#MY_FUNKY_AVATAR} -gt 3 ]; then
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clear
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# do whatever is needed to change the avatar
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# in your app
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dialog --title $"Change your avatar" \
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--msgbox $"Your avatar has been changed" 6 40
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fi
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;;
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esac
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# install_myappname will be called automatically after this function
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}
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# NOTE: deliberately no exit 0
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#+end_src
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To test your app log into your system, select *Exit to command line* then gain root powers with:
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#+begin_src bash
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sudo su
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#+end_src
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Copy your app script to */usr/share/freedombone/apps/freedombone-app-myappname*.
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And run the admin control panel:
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#+begin_src bash
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control
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#+end_src
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Select *Add/Remove Apps* and if all is well then you should see your app listed as installable. Test that installing and removing it works as expected.
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Submit your working app to *https://github.com/bashrc/freedombone/issues*
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* Customising mesh images
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If you want to make your own specially branded version of the mesh images, such as for a particular event, then to change the default desktop backgrounds edit the images within *img/backgrounds* and to change the available avatars and desktop icons edit the images within *img/avatars*. Re-create disk images using the instructions shown previously.
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If you need particular /dconf/ commands to alter desktop appearance or behavior then see the function /mesh_client_startup_applications/ within *src/freedombone-image-customise*.
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