Posts Tagged ‘tinker’

Remove old kernels

for i in $(dpkg --list | grep linux-image | cut -c5-48 | grep -v $(uname -r) | grep -v linux-image-generic); do apt-get remove --purge -y $i; done

Simple pomodoro script

This is a very basic pomodoro script I am using to avoid getting in a fixed position for hours at a time:

#!/bin/bash
 
UNIT=5
UNIT_CNT=5
PAUSE=6
 
notify-send -i clock "Starting interval..."
 
for i in $(seq $UNIT_CNT); do
    sleep ${UNIT}m
    let c=$i*$UNIT
    notify-send -i clock "$c minutes"
done
 
(for i in $(seq $PAUSE); do let c=$PAUSE-$i+1; echo -n "Pause ${c}m"; echo -e '\f'; sleep 1m; done; echo -e '\f'; echo "Work";) | sm -

Simple hdmi activate script

This is a simple script I bound to ‘meta+F7’ to activate a second hdmi display I am using:

INTERNAL=eDP1
EXTERNAL=HDMI2
LOCK=/tmp/${EXTERNAL}.on
 
disper -l | grep $EXTERNAL
 
function on {
    disper -e -d $INTERNAL,$EXTERNAL -r 1920x1080,1920x1080
    touch $LOCK
}
 
function off {
    disper -s -d $INTERNAL -r auto
    rm -f $LOCK
}
 
if [ $? -eq 1 ]; then #there is no EXTERNAL, run single command
    off
elif [ -f $LOCK ]; then
    off
else
    on
fi

 

Ubuntu 16.04

I’we used ubuntu since edgy days and migrating from gentoo. Things got better each time, until they started getting worse or until I started to expect not to have to fix and patch each time. So now I don’t feel like giving any impression, just a list of bugs:

Searching for signal

For the last few years, one of the tool I have greatly used is a Huawei E587 modem. It’s a great little device which gave me a lot of freedom. Even if it is quite old, it outperforms, even without an external antenna any smartphone I used for tethering and especially my new Samsung Galaxy S5 Neo which, as a parenthesis, has one of the poorest software I have ever seen, reminds me of a circa 2000 windows pre-installed on a laptop and filled with junkware.

However, as many other devices, the reporting of signal strength is very simplistic. My goal was to be able to identify the best spot for the external antenna defined by the best signal strength.

(more…)

Running chrome in docker with audio

The goal is to run google-chrome in a docker container with audio support. I did this trying to get skype.apk to run in archron since skype for linux does not support conferencing anymore. Even if running skype in archron did not seemed to work chrome runs flawlessly with audio support via pulse:

So here is the Dockerfile:

FROM ubuntu:14.04
MAINTAINER len@len.ro
 
RUN apt-get update && apt-get install -y wget pulseaudio && echo "deb http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list && wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add - && apt-get update && apt-get install -y google-chrome-stable
 
RUN rm -rf /var/cache/apt/archives/*
 
RUN useradd -m -s /bin/bash chrome
 
USER chrome
ENV PULSE_SERVER /home/chrome/pulse
ENTRYPOINT [ "google-chrome" ]

You can build your container using:

docker build -t len/chrome .

The run it using:

docker run -it -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=$DISPLAY -v $HOME/Downloads/chrome:/home/chrome/Downloads -v /run/user/$UID/pulse/native:/home/chrome/pulse -v /dev/shm:/dev/shm --name chrome len/chrome

 

Ensure rPi connectivity

The problem: make sure I can connect to my raspberry pi B+ even if no network is available or network change.

The idea: set a static IP.

First some information:

  • running raspbian 8.0 (cat /etc/issue)
  • there is no need for a crossover UTP cable if you connect directly to the device you can use a normal cable
  • IP configuration is delegated from /etc/network/interfaces to the dhcpcd daemon. This is why the eth0 is set on manual.

I did not wanted to crash default config. Just wanted to ensure the device will be visible. So I just added an aliased (virtual) interface with a fixed ip:

 

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d
 
auto lo
iface lo inet loopback
 
iface eth0 inet manual
 
auto eth0:0
allow-hotplug eth0:0
iface eth0:0 inet static
address 10.13.0.201
netmask 255.255.255.0
network 10.13.0.0
 
allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
 
allow-hotplug wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

This is my /etc/network/interfaces. You can now use a normal UTP cable to connect directly to the PI or on the LAN by setting an IP in the same class:

ifconfig eth0 10.13.0.1 up

Please note that if you are on ubuntu and have a NetworkManager controlled interface you might need to disable auto-control by editing /etc/NetworkManager/NetworkManager.conf (see the unmanaged-devices section)

[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
 
[ifupdown]
managed=false
 
[keyfile]
unmanaged-devices=mac:xx:xx:xx:xx:xx:xx

 

 

From monolithic single platform apps, to “write once, run everywhere”, (back) to … ?

‘A “line-of-business application” is one set of critical computer applications perceived as vital to running an enterprise’, as Wikipedia defines it. It might not always include cutting-edge technical innovation, but it involves a lot of functional knowledge on business processes thus becoming critical for the well-being of an enterprise and, as a result, has a very long life span.

The first application of this type I have worked on was running on Sun machines (OMG, how old I am! :). The architecture was simple, monolithical, the application ran on only one OS and connected directly to the DB. I think it is still in operation today somewhere. Trying to port it to NT at some point was more or less a disaster.

The second one I worked on had a html interface based heavily on tables and rarely js, developed using java and hibernate (very new at that point). The multi-tier architecture involved a server and a html client which ran in a browser, deployment and upgrade of the client was instant, the possibilities of connectivity were greatly improved. However, the interface was basic, standardized. It is still in operation today and due to the simple html used, we stepped in browser-hell only for a couple of times.

The third one was designed around 2005, with a Flex interface and java server-side. At this point it the code was ‘truly’ write once, run everywhere. The architecture was similar to the one in the previous case, but the interface had no limits, with a great look and everything a “native” interface could bring. It ran flawlessly on all flash supporting browsers. It took a few years to develop, it takes up to a year to implement at a client site and it will be buried much sooner than expected, by the death of the “so much hated flash” (even if some clients still run IE6).

Now I am looking for the set of technologies for the next application of this type. I will be working on with these technologies hopefully for some good years, and have hit a wall on the interface side. Instead of writing code for a “virtual machine” running on a variety of hosts (browsers) I am facing the possibility of writing a variety of code running on a variety of hosts. How is this anything else but a technological regression? I know the arguments against the “write once, run everywhere” paradigm once used by Sun for its java, but this is a damn gui, nothing else.
Yes, there are subtle bugs and security issues, but how can you compare this with the security issues involved in having n versions of the same application? With something like GWT or Vaadin, you add the huge complexity of handling all the browsers in your application. Consider the security issues involved in patching many such applications instead of a single ‘vm’. On maybe I should not even write a web based application and revert to a situation similar to the one from the first case I described, with completely different branches, for different platforms written in different languages? How can this development effort be justified? Or, in order to ensure longevity and easy development, the logical choice is to choose a single platform and develop natively for it alone?

Create timelapse movie from shaked photos

The problem consist of creating a timelapse made of photos which have been taken with a camera which has been removed and attached to a tripod during a few months thus creating a lot of shaking. Solution, use hugin to align photos:

#!/bin/bash
 
align_image_stack -v -a$1 -s 2 *.jpg
 
mkdir base
for i in $(find . -maxdepth 1 -name "*.tif"); do n=".$(echo $i | cut -f2 -d".").jpg"; convert $i $n && mv $n base; done
rm *.tif
cd base && mencoder -nosound -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:autoaspect:vqscale=3 -mf type=jpeg:fps=5 mf://*.jpg -o $1.avi && cd .. && mv base/$1.avi .

 

Resize a kvm disk image

1. From the vm, stop the vm:

poweroff

2. From the host, resize the disk image:

qemu-img resize /virt/disk02.img +50G

3. From the host edit partition table

parted /virt/disk02.img
GNU Parted 2.3
Using /virt/disk02.img
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print free                                                       
Model:  (file)
Disk /virt/disk02.img: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
        16.4kB  1049kB  1032kB           Free Space
 1      1049kB  51.5GB  51.5GB  primary  ext4         boot
        51.5GB  107GB   55.9GB           Free Space

(parted) rm 1                                                             
(parted) mkpart primary 1049kB -2G
(parted) print free                                                       
Model:  (file)
Disk /virt/disk02.img: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
        16.4kB  1049kB  1032kB           Free Space
 1      1049kB  105GB   105GB   primary  ext4
        105GB   107GB   2000MB           Free Space

Yes: rm 1, since this only deletes partion information, not data. Then you recreate partition info on top of data.

4. From the guest, restart, then:

resize2fs /dev/sda1