[Update] NetCologne DSL Spectrum @Home

I thought it can not be worse but since yesterday ...

Down: 1113 kbit/s
Up: 636 kbit/s

Setup/Configuration for another Magic Mirror

Note: Unfortunately, a glitch from the TV, which sometimes occurred before, seems now to be manifested. The TV doesn't power on anymore, neither using remote control nor buttons. I couldn't find a faulty component on TV circuit board. I will/have to stop this project. However, I have learned a lot, so it was not wasted time. 

General setup

• Raspberry PI 2
• SEG ArtColor TV 
• PIR module (GPIO 17, 18), IR transmitter (GPIO 4)

The PIR module will detect motion. If a motion is sense the TV will be switched on via the IR transmitter (simulation of IR remote). After a predefined timeout periode without further motion the TV will switched off (to standby).

Install and enable lirc

• install lirc

  sudo apt-get install lirc

• enable lirc module - edit /boot/config.txt

  dtoverlay=lirc-rpi,gpio_out_pin=4,gpio_in_pin=22

• configure lirc - edit /etc/lirc/hardware.conf

  LIRCD_ARGS=""
  ...
  DRIVER="default"
  DEVICE="/dev/lirc0"
  MODULES="lirc_rpi"
  

Setup IR command to power on/off the TV

• learn IR command

  irrecord -d /dev/lirc0 ~/lircd.conf

• copy new file

  sudo cp ~/lircd.conf /etc/lirc/lircd.conf

• edit the name parameter in /etc/lirc/lircd.conf I choose magicmirror
• start lirc

  pi@mamomami /etc/lirc $ sudo /etc/init.d/lirc start
  [ ok ] Loading LIRC modules:.
  [ ok ] Starting remote control daemon(s) : LIRC :.

• check if IR command is available

  pi@mamomami /etc/lirc $ irsend LIST "magicmirror" ""
  irsend: 00000000000043bc KEY_POWER
  

• run lirc service on start up

  sudo update-rc.d lirc defaults

Ansible: using numbered backreference followed by digit in lineinfile

While playing around with Ansible I've stumbled over a problem with backreferences followed by a digit.

The problem

I've want to modify some lines in a file like this:

# an example
something=xxxx

Lets assume I want to update the xxxx with some values.

A possible ansible playbook may look as follows:

---
- hosts: localhost
  tasks:
  - name: create file
    copy: src=./demo dest=/tmp/demo

  - name: update xxxx
    lineinfile:
      dest: /tmp/demo
      regexp: '^(.*)xxxx'
      line:   '\1{{ansible_date_time.year}}'
      backrefs: yes
      state: present

The update task "update xxxx" should inspect the file, search for the line with "xxxx" and replace the "xxxx" while keeping the part in front of it.
But the result is:

# an example
P16

The problem is that the backreference \1 is not resolved as expected but merged with (some) of the year digits. This results in the "P".

Solution

To solve it you have to use named groups. A named group is defined by (?P<name>pattern) and can than be reference with \g<1> or \g<name>

The following playbook shows all three variants.
For the example file

# an example
simple backref=xxxx
group backref with number=yyyy
group backref with name=zzzz

the generated output is:

# an example
P16
group backref with number=2016
group backref with name=2016

Update 2019-10-29: Replace inline code by embedded github gist to fix issue with not shown group in example.

Magic-Mirror: OpenWeatherMap Fix und TimeStamp bei den News

Wegen einer Änderung der API bei OpenWeatherMap bedurfte mein MagicMirror einer Wartung. Zum Glück waren die Änderungen gering: Beschrieben sind sie schon an anderer Stelle, daher hier nur ein Link auf eine Beschreibung in Deutsch und beim Magic-Mirror Autor.

Daneben habe ich die Gelegenheit gleich genutzt, um die Anzeige der News um die Angabe der Veröffentlichungszeit zu ergänzen. Das ganze sieht jetzt so aus:

Das GitHub Projekt ist entsprechend aktualisiert - wer will ... bitte schön.

Get the current role name in an Ansible Role

Since Ansible 1.8 the variable role_path returns the current role's pathname (see Ansible docs). Use the basename filter to extract the role name.

{{ role_path | basename }}

Note: role_path is only defined inside a role.

Install inadyn-mt on CentOS7

(Update: see post "Updated inadyn-mt package for CentOS7")

I didn't found an inadyn-mt rpm package for CentOS7. So I built one myself:

• Download the source rpm for Fedora 22.
• Install the source rpm
  

  rpm -i inadyn-mt-2.24.44-1.fc22.src.rpm

• The sources are installed in the ~/rpmbuild directory.
• Move to the rpmbuild directory and run rpmbuild
  

  cd ~/rpmbuild/SPECS
  rpmbuild -ba inadyn-mt.spec
  

• That's all. The rpm can now be installed with
  

  rpm -i ~/rpmbuild/RPMS/x86_64/inadyn-mt-2.24.44-1.el7.centos.x86_64.rpm

Here you can download it: inadyn-mt-2.24.44-1.el7.centos.x86_64.rpm

ssh-add complains: Could not open a connection to your authentication agent

When running an ansible playbook a series of ssh connections is used to perform the different playbook actions. Each ssh connection requires the ssh-key passphrase to be entered. The default way to avoid this is to use ssh-agent. The ssh-agent stores your passphrase and send it to ssh if needed. To import a key into ssh-agent you use ssh-add. I try it for my ansible experiments where ansible is running in a docker container (see my previous posts)

docker run --rm -i -t -v $(pwd):/data -w /data thomo/ansible bash -c "ssh-add deploy__2015 && ANSIBLE_SSH_ARGS='-o UserKnownHostsFile=newhosts.keys -i ./deploy__2015' ansible-playbook site.yml -i ./inventories/hosts.baremetal"
Could not open a connection to your authentication agent.

Seams that there is no ssh-agent running. The agent can be start with

eval $(ssh-agent)

But you have to take care, that the evaluation is postponed to shell in the docker - and not be done already in the host shell. So put it in single quotes:

$ ./dr 'eval $(ssh-agent) && ssh-add ./deploy__2015 && ANSIBLE_SSH_ARGS="-o UserKnownHostsFile=newhosts.keys -i ./deploy__2015" ansible-playbook site.yml -i ./inventories/hosts.baremetal'
Agent pid 8
Enter passphrase for ./deploy__2015:
Identity added: ./deploy__2015 (./deploy__2015)

PLAY [apply common configuration to all nodes] *************************
...

dr is a small script which wraps the docker run parameter

docker run --rm -i -t -w /data -v $(pwd):/data thomo/ansible bash -c "$*"

Update 2016-01-06

Improved dr script

SSHPARAM='eval $(ssh-agent) && ssh-add ./deploy__2015 && ANSIBLE_SSH_ARGS="-o UserKnownHostsFile=newhosts.keys -i ./deploy__2015"'
docker run --rm -i -t -w /data -v $(pwd):/data thomo/ansible:20160106 sh -c "${SSHPARAM} $*"

Example usage:

$ ./dr "ansible server -u deploy -m ping -i ./inventories/hosts.baremetal"
Agent pid 9
Enter passphrase for ./deploy__2015:
Identity added: ./deploy__2015 (./deploy__2015)
10.0.0.1 | success >> {
    "changed": false,
    "ping": "pong"
}