Improve updating section in README and add CHANGELOG

.gitignore

@@ -1,5 +1,7 @@
 .*_env
 
+.last_changelog_read
+
 storage/
 
 # This file is unused atm

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Admin Scripts
+
+## Changelog
+
+### 2024-03-16 - Initial Version

README.md

@@ -3,6 +3,8 @@
 This repo contains some administration scripts for administrering a debian machine.
 The covered tasks range from file change tracking via http/ssh monitoring to zfs health checking.
 
+*TODO: Add better description about host system and notification method in first sentence.*
+
 
 ## Installation
 
@@ -22,6 +24,9 @@ git clone https://git.mneun.ch/radioelephant/admin-scripts.git scripts
 mkdir -p /root/logs
 ```
 
+Please also quickly read the [CHANGELOG](CHANGELOG.md) and confirm this by running `date > /root/scripts/.last_changelog_read`.
+This will be helpful when updating the admin scripts.
+
 ### Config Files
 
 For each script there is a `.script_name_env.EXAMPLE` file, which you must copy (remove `.EXAMPLE` part) and edit while providing your own information.
@@ -32,7 +37,7 @@ cp /root/scripts/.${SCRIPT_NAME}_env.EXAMPLE /root/scripts/.${SCRIPT_NAME}_env
 vim /root/scripts/.${SCRIPT_NAME}_env
 ```
 
-If you want to use the example configuration, you can symbolic link the files.
+If you want to use the example configuration, you could symbolic link the files instead of just copying them.
 This really only makes sense for `.system_health_check`.
 The command for this is:
 
@@ -57,13 +62,17 @@ To install the startup helper script into the regular user home use the followin
 
 ```bash
 USRNAME=radioelephant
-ln -s /root/scripts/post_startup.sh /home/$USRNAME/post_startup
+cp /root/scripts/post_startup.sh /home/$USRNAME/post_startup.sh
 cp /root/scripts/.post_startup_env.EXAMPLE /home/$USRNAME/.post_startup_env
+chown $USRNAME:$USRNAME /home/$USRNAME/post_startup.sh
+chown $USRNAME:$USRNAME /home/$USRNAME/.post_startup_env
 vim /home/$USRNAME/.post_startup_env
 ```
 
 *Just shutdown your computer if you don't know how to exit VIM at this point.*
 
+See also [Updating Startup Helper](#updating-startup-helper).
+
 ### Updating
 
 You can update the admin scripts by pulling from the git remote.
@@ -73,6 +82,40 @@ cd /root/scripts
 git pull
 ```
 
+For most of the scripts you only need to check if the `.[script_name]_env.EXAMPLE` has changed and contains different keys than your copied `.[script_name]_env` file.
+For your convenience, changes to environment variable files will be documented in the [CHANGELOG](CHANGELOG.md).
+If you followed the instructions in this README, then you will find the last time you updated this repository in the `.last_changelog_read` file.
+Read it with `cat /root/scripts/.last_changelog_read`.
+
+**Make sure to update the last reading time file after reading the CHANGELOG with `date > /root/scripts/.last_changelog_read`**
+
+#### Updating Startup Helper
+
+The startup helper script in the regular user home cannot be updated via `git pull` and needs to be compared and/or copied manually.
+To compare use the following commands:
+
+```bash
+USRNAME=radioelephant
+diff /root/scripts/post_startup.sh /home/$USRNAME/post_startup.sh
+diff /root/scripts/.post_startup_env.EXAMPLE /home/$USRNAME/.post_startup_env
+```
+
+To copy the startup helper script again, use the following commands (first line not needed, if you just ran the last set of commands).
+Please adapt the environment file `/home/[USRNAME]/.post_startup_env` manually.
+
+```bash
+USRNAME=radioelephant
+cp /root/scripts/post_startup.sh /home/$USRNAME/post_startup.sh
+chown $USRNAME:$USRNAME /home/$USRNAME/post_startup.sh
+```
+
+**Make sure to update the last reading time file after reading the CHANGELOG with `date > /root/scripts/.last_changelog_read`**
+
+#### Updating Shutdown Service
+
+You might need to run `systemctl deamon-reload` after updating this repository.
+This will be noted in the CHANGELOG for your convenience.
+
 
 ## Usage