James Hannah jiphex

Running a script/service when a filesystem is mounted

I recently discovered how to do this for a JASMIN thing, and figured it may be useful.

Scenario

I would like this script/binary to be run automatically whenever a certain filesystem is mounted.

Use cases:

You want a quotacheck to be run to create the aquota.user file every time a tmpfs is mounted
You want to do something to a block device before it is mounted (e.g mkfs, fsck, unlock with some encryption key)

Instructions for using github.com/hlandau/acme with Symbiosis

Install the binary from the repo
Run acmetool quickstart, choose the Proxy option, and enable the cronjob
Add this line after the <VirtualHost...:80 stanzas in the config files in /etc/symbiosis/apache.d: ProxyPass "/.well-known/acme-challenge" "http://127.0.0.1:402/.well-known/acme-challenge"
Enable apache mod_proxy - a2enmod proxy_http
Copy the attached hook into /usr/lib/acme/hooks and make it executable
Run acmetool want domain.tld www.domain.tld for any domains you want to be secured

IPv6-only LAN with OpenBSD

My ISP provides IPv6 for their home broadband networks, soon other ISPs will too (notably BT who are running a trial of it at the moment). Unless they do it in some insane way, this means that every broadband subscriber will be allocated a /64 of IPv6 space to do with as they please.

The normal way to use this is to "dual-stack" your network, keeping DHCPv4 to hand out NAT-ed RFC1918 addresses to your machines while also using SLAAC to advertise your IPv6 prefix from the router so that machines on the network can autoconfigure themselves an IPv6 address.

If you only want to access IPv6 sites from networked machines, you can disable DHCPv4 altogether on your network, and subject to some caveats[1] your machines will work just fine when they access sites with working AAAA records (such as Facebook and Google).

The problem comes when your machines try and access websites which don't have AAAA records - these will just display a browser error.

Include this in your ~/.config/awesome/rc.lua file and then add the widget at the same place you add your clock.

Output is like 69%[123] - the number in the square brackets is the minutes remaining (or ??)

Colour will be green if charging, white if battery is high, yellow if low or red if critical.

	package main

	import (
	"context"
	"fmt"
	"net"
	"os"
	"time"

	log "github.com/sirupsen/logrus"

	#!/usr/bin/env ruby
	require 'net/http'
	require 'json'

	u = URI('https://fcc.transportapi.com/v3/uk/bus/stop/340000368SHE/live.json?group=no&nextbuses=yes')
	res = Net::HTTP.get(u)
	b = JSON.load(res)
	fs = "%4s %-18s %5s"
	h = fs % %w(Bus Towards Time)
	puts h

	require 'ipaddr'
	require 'ostruct'
	require 'json'
	require 'pp'
	data = JSON.load(STDIN)["json"]
	ZONE = data['dns']['zone']
	STDERR.puts "DNS 123REG BS for [#{ZONE}]"
	exit if ZONE.nil?

	def ttl(rec)

	def x(items):
	print('before loop')
	for x in items:
	print ('before yield')
	yield "xx %s yy" % x
	print('after yield')
	print('after loop')

	for i in x(list((1,2,3,4))):
	print "zz %s aa" % i

	[Unit]
	Description=LXC %i
	Requires=lxc.service

	[Service]
	ExecStart=/usr/bin/lxc-start --name=%i
	ExecStop=/usr/bin/lxc-stop --name=%i

	[Install]
	WantedBy=multi-user.target

	### Keybase proof

	I hereby claim:

	* I am jiphex on github.
	* I am jiphex (https://keybase.io/jiphex) on keybase.
	* I have a public key whose fingerprint is AA0D 95BB B25B 595A 14B9 6906 25E1 4B9F 86A2 49D4

	To claim this, I am signing this object: