MartinBrugnara

PROMPT="%(?:%{$fg_bold[green]%}➜ :%{$fg_bold[red]%}➜ )"
# PROMPT+=' %{$fg[cyan]%}%c%{$reset_color%} $(git_prompt_info)'
PROMPT+=' %{$fg[cyan]%}%/%{$reset_color%} $(git_prompt_info)'

ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg_bold[blue]%}git:(%{$fg[red]%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "
ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[blue]%}) %{$fg[yellow]%}✗"
ZSH_THEME_GIT_PROMPT_CLEAN="%{$fg[blue]%})"

MartinBrugnara

We identified 3 possible "common" causes:

1) If no user shows up at all, check for `greeter-hide-users=false` in `/etc/lightdm/lightdm.conf.d/*` , if missing create it.
   See also: https://wiki.debian.org/LightDM#Enable_user_list
   
2) If only some of the users shows up, or step 1 is already correct. Check for MIN_UID/MAX_UID settings.
   Most likely locations: 
   - /etc/lightdm/users.conf   --> `minimum-uid`
   - /etc/login.defs
   

MartinBrugnara

TL;DR; Force the use nfs4.0 (the issue arises with nfs > 4.1).

# Situation:
* NFS server with multiple IP. E.g. different subnets for different access levels and or bandwidth/MTU.
IPs
192.168.10.1    
192.168.20.1    

Exports:
/srv/nfs/lvl10   192.168.10.0/255.255.255.0

MartinBrugnara

By default will wait on all the interfaces managed by `systemd-networkd` to come online and get fully configured.
All interfaces that appear in any file in `/etc/systemd/network` (and friends) are considered managed.

We can use `networkctl` to see the actual "configuration progress status". Any interface stuck on "configuring" is an issue.
While this is usually an indication of network problem, it may be a false positive, for example:
* Slave interfaces in a bond
* Slave interfaces in a bridge
Since these interfaces appear in the folders above but do not have any ip will never reach the state of "configured", 
hence the service will halt.

MartinBrugnara

Symptoms: Port forwarding not working, machine not reachable from outside, strange public IP.

By default, many ISPs that use PPPoE for authentication do not automatically assign a public IPv4 (to save some..),
you may have to ask your ISP to assign one to you either static or dynamic.

By default, EdgeRouter does not setup the IP (if) provided by the ISP when connecting via PPPoE.
To use the IP, execute the following procedure:
- From the dashboard
  Select "Actions" on the PPPoE interface
  Then "config"

MartinBrugnara

Windows & WSL1 & WSL 2 SSH with gpg cards support

>> Windows & WSL1

Based upon: 
- https://www.antirandom.com/2020/03/ssh-on-windows-with-private-key-on-yubikey/
- https://github.com/benpye/wsl-ssh-pageant

Requirements:
- [win] gpg4win

MartinBrugnara

# /etc/sysctl.d/wireguard.conf
net.ipv4.ip_forward=1
net.ipv6.conf.all.forwarding=1
net.ipv6.conf.default.forwarding=1
net.ipv6.conf.eth0.proxy_ndp=1

#/etc/wireguard/wg0.conf   (DO virtual machine)
[Interface]
# The server interface does not actually need an ipv6.
# The 2 following must be repeated for each used addres [0, 1]

MartinBrugnara

Hide users:
sudo vim /var/lib/AccountsService/users/<username>
```
[User]
SystemAccount=true
```


Install scanner (default lib is too old and buggy)
```

MartinBrugnara

# /etc/udev/rules.d/85-yubikey.rules

# https://stackoverflow.com/questions/13699241/passing-arguments-to-shell-script-from-udev-rules-file#14982520
# https://askubuntu.com/questions/635266/use-of-yubikey-neo-for-login-2fa-and-lock-screen#635267
# Bus 001 Device 012: ID 1050:0407 Yubico.com
ACTION=="remove", ENV{ID_VENDOR_ID}=="1050", RUN+="/usr/local/bin/yubikey_lock.sh '%E{ID_SERIAL}' '%E{ID_MODEL_ID}'"

MartinBrugnara

#!/usr/bin/env ruby

# matrix.rb
# MB version (heavily broken)


# class MatrixArgumentError < ArgumentError; end
# class MatrixRuntimeError < RuntimeError; end

class Matrix