add Xmpp Apt Notifications

docs/extra.css

@@ -2,3 +2,8 @@ h1 {
   font-weight: 600 !important;
   color: black !important;
 }
+
+.center {
+    display: block;
+    margin: 0 auto;
+}

docs/index.md

@@ -5,6 +5,7 @@ authors: ["trent"]
 # Trent's Blog
 ## **Posts By Date**
 
+* [2021-01-09: Xmpp Apt Notifications](posts/xmpp-apt-notifications.md){target=_blank}
 * [2020-12-20: Apache Virtual Hosts](posts/apache-virtual-hosts.md){target=_blank}
 * [2020-12-19: SENDXMPPHandler for Python Logging](posts/sendxmpp-handler-for-python-logging.md){target=_blank}
 * [2020-12-17: Instructions for Tethering From Phone](posts/instructions-for-tethering-from-phone){target=_blank}

docs/posts/xmpp-apt-notifications.md

@@ -0,0 +1,68 @@
+---
+title: "Xmpp Apt Notifications"
+date: 2021-01-09
+draft: false
+tags: ["apt","apt-get","prosody","debian"]
+authors: ["trent"]
+---
+date: 2021-01-09
+
+## **Introduction**
+In order to save yourself the work of checking your computer for
+updates, configure it to send you a weekly notification for updates
+using cron and sendxmpp.
+
+## **Register an Xmpp User**
+`ssh` into your prosody server and use `prosodyctl` to create a user
+for your computer.
+
+i.e. for your htpc:
+```console
+# prosodyctl adduser htpc@example.com
+```
+You will be prompted to create a password.
+
+## **Install sendxmpp**
+`ssh` into your computer and install `sendxmpp`.
+
+i.e. for your htpc:
+```console
+$ sudo apt-get install sendxmpp
+```
+
+## **Configure sendxmpp**
+`ssh` into your computer and login as the root user
+using
+```console
+$ sudo su
+```
+write the following contents into `/root/.sendxmpprc`, i.e.
+for your htpc
+```conf
+htpc@example.com;example.com <password> 
+```
+secure your `.sendxmpprc` file by making it read-only, and
+only accessible by the root user
+```console
+# chmod 600 /root/.sendxmpprc
+```
+
+## **Create Cron Job**
+While still logged in as root, open `crontab` for editing.
+```console
+# crontab -e
+```
+And then write a command in `crontab`, i.e. for your htpc.
+```conf
+#!/bin/bash
+PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+15 3 * * 4 apt-get update && apt-get -u upgrade --assume-no | sendxmpp -t -u htpc <yourself>@example.com
+```
+
+## **Receive Notifications on Android Device**
+
+<div align="center">
+  <em>Example Notification in Yaxim on Android</em>
+</div>
+
+!["Yaxim ScreenShot"](https://photos.boringonian.com/1280_IMG_20210109_155515.jpg){: .center }