developers guide
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Bob Mottram
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<meta name="description" content="Turn the Beaglebone Black into a personal communications server"
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<link rel="stylesheet" type="text/css" href="freedombone.css" />
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<script type="text/javascript">
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/*
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@licstart The following is the entire license notice for the
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Copyright (C) 2012-2013 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
|
||||
General Public License (GNU GPL) as published by the Free Software
|
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Foundation, either version 3 of the License, or (at your option)
|
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any later version. The code is distributed WITHOUT ANY WARRANTY;
|
||||
without even the implied warranty of MERCHANTABILITY or FITNESS
|
||||
FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
|
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|
||||
As additional permission under GNU GPL version 3 section 7, you
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||||
may distribute non-source (e.g., minimized or compacted) forms of
|
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that code without the copy of the GNU GPL normally required by
|
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section 4, provided you include this license notice and a URL
|
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through which recipients can access the Corresponding Source.
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<body>
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<div id="preamble" class="status">
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||||
<a name="top" id="top"></a>
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</div>
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<div id="content">
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<div class="org-center">
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<div class="figure">
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<p><img src="images/logo.png" alt="logo.png" />
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</p>
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</div>
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</div>
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<center><h1>Developers Guide</h1></center>
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<div id="outline-container-org27d5926" class="outline-2">
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<h2 id="org27d5926">Adding extra apps</h2>
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<div class="outline-text-2" id="text-org27d5926">
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<p>
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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. On an installed system the app scripts go into the directory:
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</p>
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<div class="org-src-container">
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<pre class="src src-bash">/usr/share/freedombone/apps
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</pre>
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</div>
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<p>
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and within the project repo they appear within the <i>src</i> directory. Your new app script should have the name:
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</p>
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<div class="org-src-container">
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<pre class="src src-bash">freedombone-app-[myappname]
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</pre>
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</div>
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<p>
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The <i>myappname</i> value should not contain any spaces and will appear in the list of available apps.
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</p>
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<p>
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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 <i>myappname</i> with your own.
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</p>
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<div class="org-src-container">
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<pre class="src src-bash"><span class="org-comment-delimiter">#</span><span class="org-comment">!/bin/</span><span class="org-keyword">bash</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">Copyright (C) Year YourName <YourEmail></span>
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||||
<span class="org-comment-delimiter">#</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">This program is free software: you can redistribute it and/or modify</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">it under the terms of the GNU Affero General Public License as published by</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">the Free Software Foundation, either version 3 of the License, or</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">(at your option) any later version.</span>
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||||
<span class="org-comment-delimiter">#</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">This program is distributed in the hope that it will be useful,</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">GNU Affero General Public License for more details.</span>
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||||
<span class="org-comment-delimiter">#</span>
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||||
<span class="org-comment-delimiter"># </span><span class="org-comment">You should have received a copy of the GNU Affero General Public License</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">along with this program. If not, see <a href="http://www.gnu.org/licenses/"><http://www.gnu.org/licenses/></a>.</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">'full' includes your app in the full installation and you can also</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">add other variants, separated by spaces. The available variants will</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">be detected automatically from the app scripts.</span>
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<span class="org-variable-name">VARIANTS</span>=<span class="org-string">'full'</span>
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||||
<span class="org-variable-name">SOME_IMPORTANT_CONFIG_VARIABLE</span>=<span class="org-string">'some important value'</span>
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<span class="org-variable-name">ANOTHER_IMPORTANT_CONFIG_VARIABLE</span>=<span class="org-string">'foo'</span>
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<span class="org-variable-name">MY_FUNKY_AVATAR</span>=fro.png
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<span class="org-variable-name">MYAPPNAME_ONION_PORT</span>=[port number]
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<span class="org-variable-name">MYAPPNAME_DB_PASSWORD</span>=
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<span class="org-comment-delimiter"># </span><span class="org-comment">A directory where the data exists</span>
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<span class="org-variable-name">MYAPP_DATA_DIR</span>=/var/lib/somedirectory
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<span class="org-variable-name">myappname_variables</span>=(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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|
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<span class="org-keyword">function</span> <span class="org-function-name">change_password_myappname</span> {
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<span class="org-variable-name">PASSWORD_USERNAME</span>=<span class="org-string">"$1"</span>
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<span class="org-variable-name">PASSWORD_NEW</span>=<span class="org-string">"$2"</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">Do something to change the password</span>
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}
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<span class="org-keyword">function</span> <span class="org-function-name">reconfigure_myappname</span> {
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<span class="org-builtin">echo</span> -n <span class="org-string">''</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">Do something to delete existing keys/identity and generate new ones</span>
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}
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<span class="org-keyword">function</span> <span class="org-function-name">upgrade_myappname</span> {
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<span class="org-builtin">echo</span> -n <span class="org-string">''</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">Do something to upgrade this app.</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">If it's a debian package then it will be maintained by the</span>
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<span class="org-comment-delimiter"># </span><span class="org-comment">operating system and you don't need anything here</span>
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}
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<span class="org-keyword">function</span> <span class="org-function-name">backup_local_myappname</span> {
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<span class="org-comment-delimiter"># </span><span class="org-comment">If your app has a MariaDB/MySQL database</span>
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backup_database_to_usb myappname
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<span class="org-comment-delimiter"># </span><span class="org-comment">To backup a directory</span>
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backup_directory_to_usb $<span class="org-variable-name">MYAPP_DATA_DIR</span> myappname
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<span class="org-comment-delimiter"># </span><span class="org-comment">if you need to backup data within individual user home directories</span>
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<span class="org-keyword">for</span> d<span class="org-keyword"> in</span> /home/*/ ; <span class="org-keyword">do</span>
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<span class="org-variable-name">USERNAME</span>=$(<span class="org-sh-quoted-exec">echo</span> <span class="org-string">"$d"</span> | awk -F <span class="org-string">'/'</span> <span class="org-string">'{print $3}'</span>)
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<span class="org-keyword">if</span> [[ $(<span class="org-sh-quoted-exec">is_valid_user</span> <span class="org-string">"$USERNAME"</span>) == <span class="org-string">"1"</span> ]]; <span class="org-keyword">then</span>
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<span class="org-builtin">echo</span> $<span class="org-string">"Backing up myappname config for $USERNAME"</span>
|
||||
<span class="org-keyword">if</span> [ -d /home/$<span class="org-variable-name">USERNAME</span>/.config/myappname ]; <span class="org-keyword">then</span>
|
||||
backup_directory_to_usb /home/$<span class="org-variable-name">USERNAME</span>/.config/myappname myappname_users/$<span class="org-variable-name">USERNAME</span>
|
||||
<span class="org-keyword">fi</span>
|
||||
<span class="org-keyword">fi</span>
|
||||
<span class="org-keyword">done</span>
|
||||
}
|
||||
|
||||
<span class="org-keyword">function</span> <span class="org-function-name">restore_local_myappname</span> {
|
||||
<span class="org-variable-name">temp_restore_dir</span>=/root/tempmyappname
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If your app has a MariaDB/MySQL database</span>
|
||||
restore_database myappname
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Restore some data from a directory</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Note that we don't restore directly but to a temporary directory</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">and then copy the files. This ensures that if there is a restore</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">failure you don't end up with half-copied or corrupted files</span>
|
||||
restore_directory_from_usb $<span class="org-variable-name">MYAPP_DATA_DIR</span> myappname
|
||||
cp -r $<span class="org-variable-name">temp_restore_dir</span>/$<span class="org-variable-name">MYAPP_DATA_DIR</span> $<span class="org-variable-name">MYAPP_DATA_DIR</span>
|
||||
rm -rf $<span class="org-variable-name">temp_restore_dir</span>
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If you need to restore a configuration directory for each user</span>
|
||||
<span class="org-keyword">if</span> [ -d $<span class="org-variable-name">USB_MOUNT</span>/backup/myappname_users ]; <span class="org-keyword">then</span>
|
||||
<span class="org-keyword">for</span> d<span class="org-keyword"> in</span> $<span class="org-variable-name">USB_MOUNT</span>/backup/myappname_users/*/ ; <span class="org-keyword">do</span>
|
||||
<span class="org-variable-name">USERNAME</span>=$(<span class="org-sh-quoted-exec">echo</span> <span class="org-string">"$d"</span> | awk -F <span class="org-string">'/'</span> <span class="org-string">'{print $6}'</span>)
|
||||
<span class="org-keyword">if</span> [[ $(<span class="org-sh-quoted-exec">is_valid_user</span> <span class="org-string">"$USERNAME"</span>) == <span class="org-string">"1"</span> ]]; <span class="org-keyword">then</span>
|
||||
<span class="org-keyword">if</span> [ <span class="org-negation-char">!</span> -d /home/$<span class="org-variable-name">USERNAME</span> ]; <span class="org-keyword">then</span>
|
||||
${<span class="org-variable-name">PROJECT_NAME</span>}-adduser $<span class="org-variable-name">USERNAME</span>
|
||||
<span class="org-keyword">fi</span>
|
||||
<span class="org-builtin">echo</span> $<span class="org-string">"Restoring Vim config for $USERNAME"</span>
|
||||
function_check restore_directory_from_usb
|
||||
restore_directory_from_usb $<span class="org-variable-name">temp_restore_dir</span> myappname_users/$<span class="org-variable-name">USERNAME</span>
|
||||
cp -r $<span class="org-variable-name">temp_restore_dir</span>/home/$<span class="org-variable-name">USERNAME</span>/.config /home/$<span class="org-variable-name">USERNAME</span>/
|
||||
<span class="org-keyword">if</span> [ <span class="org-negation-char">!</span> <span class="org-string">"$?"</span> = <span class="org-string">"0"</span> ]; <span class="org-keyword">then</span>
|
||||
rm -rf $<span class="org-variable-name">temp_restore_dir</span>
|
||||
set_user_permissions
|
||||
backup_unmount_drive
|
||||
<span class="org-keyword">exit</span> 664
|
||||
<span class="org-keyword">fi</span>
|
||||
rm -rf $<span class="org-variable-name">temp_restore_dir</span>
|
||||
<span class="org-keyword">fi</span>
|
||||
<span class="org-keyword">done</span>
|
||||
<span class="org-keyword">fi</span>
|
||||
}
|
||||
|
||||
<span class="org-keyword">function</span> <span class="org-function-name">backup_remote_myappname</span> {
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">this should be the same as backup_local_myappname,</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">but call the backup functions backup_directory_to_friend</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">and backup_database_to_friend</span>
|
||||
}
|
||||
|
||||
<span class="org-keyword">function</span> <span class="org-function-name">restore_remote_vim</span> {
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">this should be the same as restore_local_myappname,</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">but call the restore function restore_directory_from_friend</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">and restore_database_from_friend</span>
|
||||
}
|
||||
|
||||
<span class="org-keyword">function</span> <span class="org-function-name">remove_myappname</span> {
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">if it's a debian package then:</span>
|
||||
apt-get -y remove --purge [my-app-package-name]
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If your app has a MariaDB/MySQL database</span>
|
||||
drop_database myappname
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If your app uses an onion address</span>
|
||||
remove_onion_service myappname ${<span class="org-variable-name">MYAPPNAME_ONION_PORT</span>}
|
||||
}
|
||||
|
||||
<span class="org-keyword">function</span> <span class="org-function-name">install_myappname</span> {
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">if it's a debian package then:</span>
|
||||
apt-get -y install [my-app-package-name]
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If you need to create a MariaDB/MySQL database for the app</span>
|
||||
<span class="org-variable-name">MYAPPNAME_DB_PASSWORD</span>=<span class="org-string">"$(</span><span class="org-sh-quoted-exec">create_password</span><span class="org-string"> 20)"</span>
|
||||
create_database myappname <span class="org-string">"$MYAPPNAME_DB_PASSWORD"</span> $<span class="org-variable-name">MY_USERNAME</span>
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If you need to create an onion address for the app</span>
|
||||
<span class="org-variable-name">MYAPPNAME_ONION_HOSTNAME</span>=$(<span class="org-sh-quoted-exec">add_onion_service</span> myappname 80 ${<span class="org-variable-name">MYAPPNAME_ONION_PORT</span>})
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Do any other configuration</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Here you might use $ONION_ONLY or $SOME_IMPORTANT_CONFIG_VARIABLE</span>
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Mark the app as having installed successfully</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">If this variable isn't set then it will be assumed that</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">the install has failed</span>
|
||||
<span class="org-variable-name">APP_INSTALLED</span>=1
|
||||
}
|
||||
|
||||
<span class="org-keyword">function</span> <span class="org-function-name">install_interactive_myappname</span> {
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Interactively obtain some values using dialog, such as</span>
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">domain names. An avatar changing example is:</span>
|
||||
<span class="org-variable-name">data</span>=$(<span class="org-sh-quoted-exec">tempfile</span> 2>/dev/null)
|
||||
<span class="org-keyword">trap</span> <span class="org-string">"rm -f $data"</span> 0 1 2 5 15
|
||||
dialog --title $<span class="org-string">"Change your avatar"</span> <span class="org-sh-escaped-newline">\</span>
|
||||
--backtitle $<span class="org-string">"Freedombone Control Panel"</span> <span class="org-sh-escaped-newline">\</span>
|
||||
--inputbox $<span class="org-string">"Enter a URL for an image. It should be approximately a square image."</span> 8 75 2>$<span class="org-variable-name">data</span>
|
||||
<span class="org-variable-name">sel</span>=$<span class="org-variable-name">?</span>
|
||||
<span class="org-keyword">case</span> $<span class="org-variable-name">sel</span><span class="org-keyword"> in</span>
|
||||
0)
|
||||
<span class="org-variable-name">MY_FUNKY_AVATAR</span>=$(<$<span class="org-variable-name">data</span>)
|
||||
<span class="org-keyword">if</span> [ ${#<span class="org-variable-name">MY_FUNKY_AVATAR</span>} -gt 3 ]; <span class="org-keyword">then</span>
|
||||
clear
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">do whatever is needed to change the avatar in your app</span>
|
||||
|
||||
dialog --title $<span class="org-string">"Change your avatar"</span> <span class="org-sh-escaped-newline">\</span>
|
||||
--msgbox $<span class="org-string">"Your avatar has been changed"</span> 6 40
|
||||
<span class="org-keyword">fi</span>
|
||||
;;
|
||||
<span class="org-keyword">esac</span>
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">Then do the main install</span>
|
||||
install_myappname
|
||||
}
|
||||
|
||||
<span class="org-comment-delimiter"># </span><span class="org-comment">NOTE: deliberately no exit 0</span>
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>
|
||||
To test your app log into your system, select <b>Exit to command line</b> then gain root powers with:
|
||||
</p>
|
||||
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-bash">sudo su
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>
|
||||
Copy your app script to <b>/usr/share/freedombone/apps/freedombone-app-myappname</b>.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
And run the admin control panel:
|
||||
</p>
|
||||
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-bash">control
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p>
|
||||
Select <b>Add/Remove Apps</b> and if all is well then you should see your app listed as installable. Test that installing and removing it works as expected.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Submit your working app to <b><a href="https://github.com/bashrc/freedombone/issues">https://github.com/bashrc/freedombone/issues</a></b>
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div id="postamble" class="status">
|
||||
|
||||
<style type="text/css">
|
||||
.back-to-top {
|
||||
position: fixed;
|
||||
bottom: 2em;
|
||||
right: 0px;
|
||||
text-decoration: none;
|
||||
color: #000000;
|
||||
background-color: rgba(235, 235, 235, 0.80);
|
||||
font-size: 12px;
|
||||
padding: 1em;
|
||||
display: none;
|
||||
}
|
||||
|
||||
.back-to-top:hover {
|
||||
background-color: rgba(135, 135, 135, 0.50);
|
||||
}
|
||||
</style>
|
||||
|
||||
<div class="back-to-top">
|
||||
<a href="#top">Back to top</a> | <a href="mailto:bob@robotics.uk.to">E-mail me</a>
|
||||
</div>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue