feat(syncthing): troubleshooting

knowledge base/syncthing.md

@@ -3,6 +3,9 @@
 ## Table of contents <!-- omit in toc -->
 
 1. [TL;DR](#tldr)
+1. [Configuration](#configuration)
+1. [Troubleshooting](#troubleshooting)
+   1. [I forgot the password](#i-forgot-the-password)
 1. [Further readings](#further-readings)
    1. [Sources](#sources)
 
@@ -20,22 +23,46 @@ syncthing --gui-address '0.0.0.0:8384' --no-default-folder
 systemctl --user start 'syncthing.service'
 ```
 
+## Configuration
+
+| OS       | Path                                                           |
+| -------- | -------------------------------------------------------------- |
+| Linux    | `$XDG_STATE_HOME/syncthing`<br/>`$HOME/.local/state/syncthing` |
+| Mac OS X | `$HOME/Library/Application Support/Syncthing`                  |
+| Windows  | `%LOCALAPPDATA%\Syncthing`                                     |
+
+## Troubleshooting
+
+### I forgot the password
+
+Remove the entry under `gui.password` in the [configuration file][configuration]:
+
+```sh
+# With XMLStarlet
+xml ed -L -d 'configuration/gui/password' 'Library/Application Support/Syncthing/config.xml'
+```
+
+Then enter the settings on the host and set a new password.
+
 ## Further readings
 
 - [Website]
 
-## Sources
-
-All the references in the [further readings] section, plus the following:
+### Sources
 
 - [The GUI listen address]
 - [File versioning]
+- [Configuration]
 
 <!--
   References
   -->
 
+<!-- In-article sections -->
+[configuration]: #configuration
+
 <!-- Upstream -->
+[configuration]: https://docs.syncthing.net/users/config.html
 [file versioning]: https://docs.syncthing.net/users/versioning.html
 [the gui listen address]: https://docs.syncthing.net/users/guilisten.html
 [website]: https://syncthing.net/

knowledge base/xml.placeholder

@@ -0,0 +1,6 @@
+https://www.fosslinux.com/114195/ways-to-parse-an-xml-file-on-linux.htm
+https://cheat.sh/xmllint
+https://cheat.sh/xml
+
+xml sel -t -v configuration/gui/password 'Library/Application Support/Syncthing/config.xml'
+xml ed -L -d 'configuration/gui/password' 'Library/Application Support/Syncthing/config.xml'