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Category Archives: I.T.

  • IT rant

    I don’t know why it is that every time I want to download the simplest of modules I’m asked to download this great new package manager to end all package managers. Which results in this glorious 3 fold install sequence:Screen Shot 2016-01-07 at 1.40.19 PM“Installing is easy, Composer will take care of all dependencies! Ooops it doesn’t but PECL will! Oops just kidding I guess we’re back to apt.”

    Not to mention all 3 package managers are independent from one another so changes in one don’t percolate to the others; thus throwing out the window their mission to resolve dependencies.

    I’m flabbergasted by this trend and its unquestioned acceptance.

  • A solar powered blog

    This blog is now powered by a Raspberry Pi using 100% solar energy. Nicole instrumented the Phidgets sensors so we would gain some visibility into our electricity production & consumption. This has already given us some great insights. We can see the effect that each device we use has on the system: how much the LED lamps take to charge, the hole that the inverter blasts through the battery when turned on. We can tell that not all sunny days are created equal in their ability to give a charge. We can even tell the increase in electricity consumption that rsyncing a whole bunch of data to the Pi has: 0.03A.

    The sensors

    • solar panels volts (a good indicator of sunlight)
    • input amps (indicates when the charge controller uses produced electricity)
    • output amps / load (what we consume with various devices)
    • battery volts (whether this blog will make it through the night or not)

    For now I’m only graphing using the Gnuplot one-liner from Hell. More to come…

    Screen Shot 2015-11-05 at 12.33.16 PM

    It blows my mind way too hard that I have a system in which sunlight comes in and organized information comes out. And by organized information I mean lolcats.serious-cat

  • Footage from above of the beautiful place we’re calling home

    Thank you Jared :)

  • Hubsan X4 H107C

    Really a great little quadcopter. Much fun to be had with it, I’m almost ready to take it outside.

  • Duplogrifier

    I’ve been wondering for a while if I could represent a picture with Duplo pixels in a way that would do it justice.

    Introducing the Duplogrifier!

    Duplogrifier will take any JPEG and turn it into an arrangement of 2×2 Duplo bricks. Now truth be told, the answer to my original question is “no”. There are not enough colors available and it would take a obscene amount of bricks to build something visually acceptable. However it leads to some fairly cool results.

    2015-04-15: added 6 more “pixel” colors.

    You can play with it here:

  • Resilient SSH Tunnel

    #!/bin/bash
    
    tunnel_entrance_port=13306
    tunnel_end=username@re.mo.te.ip
    destination=127.0.0.1
    destination_port=3306
    
    # Use netcat to connect to tunnel entrance port. If its exit code is not zero, the tunnel needs to be brought up
    nc -w1 localhost $tunnel_entrance_port > /dev/null
    if [[ $? -ne 0 ]]; then
            echo "creating new tunnel for MySQL"
            /usr/bin/ssh -f -N -L $tunnel_entrance_port:$destination:$destination_port $tunnel_end
            if [[ $? -eq 0 ]]; then
                    echo "  tunnel to $destination through $tunnel_end created successfully"
            else
                    echo "  an error occurred creating a tunnel to $destination through $tunnel_end"
            fi
    fi
  • Script to reboot a Comtrend AR-5381u Modem when connectivity is lost

    #!/bin/bash
    
    # default username for this model
    export MODEMUSERNAME=admin
    # default password for model
    export MODEMPASSWORD=user12345
    export COOKIE=/tmp/cookie_jar
    export CURL=/usr/bin/curl
    export PING=/bin/ping
    export GREP=/bin/grep
    export CUT=/usr/bin/cut
    
    $PING -c 5 google.com > /dev/null 2>&1
    
    if [ $? -ne 0 ]
    then
            rm $COOKIE > /dev/null 2>&1
    
            export OUTPUT=`$CURL -v -c $COOKIE 'http://$MODEMUSERNAME:$MODEMPASSWORD@192.168.1.1/resetrouter.html' 2>> /tmp/output`
            export SESSIONKEY=`echo "$OUTPUT" | $GREP var | $GREP sessionKey | $CUT -d"=" -f2 | $CUT -d"'" -f2`
            echo "kicking modem with session key $SESSIONKEY"
            export OUTPUT=`$CURL -v -c $COOKIE "http://$MODEMUSERNAME:$MODEMPASSWORD@192.168.1.1/rebootinfo.cgi?sessionKey=$SESSIONKEY" 2>> /tmp/output`
    fi
  • Google Drive API – the case of the unprocessed video files

    We’ve been using the Google Drive API uploader for quite a while now. The main lesson we took away from using Google service, specifically from their API is that things will break for more or less valid reasons. That’s not to say we’re unhappy with the way things are going, by and large Google provides amazing service.

    To answer quirks, we’ve done everything from handling 2 http response codes to crawling folders to add & remove user permissions or they wouldn’t see the folders that were shared with their groups.

    The last bug we’ve had on our radar for a while is that of the Video files that mysteriously would go unprocessed.Screen Shot 2015-01-15 at 16.27.21Leave them for days they will never get encoded. Everything about the file is right but specifically the md5 checksum reported by Google. The only way to have it processed is to re-upload it. After months of chasing down such files we finally found a programmatic way to “kick” the processing.

    When a file is in this state, it does not contain the “thumbnail” attribute, this is how you find them. Then if its “createdDate” attribute is older than X hours, you can run API calls to copy it and delete the original.

    Screen Shot 2015-01-15 at 20.15.23

    Of course this assumes you’re already knee deep into API land.

  • 3D Printed Snowglobe

    Here’s a cool idea for a present, model someone’s house, 3D print it and stick it in a snow globe. Bonus points if the person is really attached to their house and live in a place that gets good snow.

    How hard can this be right? Well it’s actually pretty hard but I feel like with all the gotchas researched and out of the way, that I would be able to do another one easily.

    Here’s the process in a nutshell:

    1. Sketchup for modeling
    2. Shapeways for 3D printing
    3. Painting
    4. Sticking in snow globe

    Here’s the actual process with all the gotchas:

    1. Sketchup for modeling

    Sketchup is perfect for the job and can export models to DAE natively and STL using this plugin, both formats can be imported by Shapeways. But it can be very hard to model a solid with no leaks. And leaks will really fuck things up. Also if you have a leaky model, fixing it it out of the question requiring starting from scratch. This other plugin is quite good at finding leaks but horrible a pointing them out, I only found it later in the process but I found it useful to check the model with it every time I made a change. The same way you compile after every added line of code right? There are other products out there to find the leaks and point them out, all of them horrible and requiring various exports imports to see results. Ultimately you know you have a leak when your model looks like shit in the finder preview on your mac (yes *.daes are previewable) or in Shapeways’ excellent viewer.

    Screen Shot 2015-01-05 at 21.54.02

    2. Shapeways for 3D printing

    Absolutely nothing bad to say there, Shapeways is amazing and light years ahead of the competition in terms of service & useability. I used their “strong & flexible plastic” material as it’s cheap and I had done extended submersion tests with it but it is quite limited in the small details it can render. The minimum wall size with it is 0.7 millimeters and anything around this size doesn’t look super sharp. They just came up with a line of “Detail Acrylic” materials which promise much better resolution but I was too far in the process and hadn’t tested the material in water. To compound the issue the empty snowglobes I found are on the small side and so a lot of details that make a house special to someone got lost.

    Screen Shot 2015-01-05 at 16.50.27

    IMG_1477

    3. Painting

    This is where small didn’t help, it was tedious but not impossible. Definitely being able to 3D print the color would have been nice but the only material that allows this at the moment (full color sandstone) doesn’t lend itself well to this project. You also want to varnish it for good measure. As far as gluing the house and subsequently the globe on its wooden base I’ve used E6000 which was recommended by the manufacturer and many custom snowglobe making blogs.

    IMG_2071

    4. Sticking in snowglobe

    This is the trickiest operation where everything can go wrong. First of all it’s good to play with how to insert the rubber gasket before you glue a house to it. Putting in in the freezer for 5 minutes and adding water to its edges will help slide it in.

    Now about 80% of the snowflakes that were provided floated and wanted to do nothing else than float. A good idea is to put the flakes in another glass of water, scoop the shitty floating ones out and then add the rest to the globe upside down right before you add the house. Quite frankly I wish I had even filtered the snowflakes, they came with particles that gray out the water a bit. Some recommend adding glycerin to slow the falling of the flakes, I felt like they were falling at an acceptable rate with only water.

    Another issue is one of bacteria growth. Per recommendations I’ve disinfected everything and used distilled water and added 1 drop of rubbing alcohol to the water. In the submersion tests I’ve done (not using distilled water or alcohol) the water would get noticeably funky after ~3 months. I don’t know how the new method holds over time.

    Pull a bit of the gasket away to fill with distilled water, add some E6000 glue around the joint between the rubber and the glass and you’re set.

    IMG_2076

    Hard truth #1: A simple house isn’t a great subject to put in a snow globe, it kind of depends on it shape but it will occupy only the bottom part of the globe. I’m still happy about the result.

    Hard truth #2: Snow globe distort the view of what is inside them. Not a huge deal, this just caught me off guard.

    IMG_2096

    The finished product

    IMG_2101

  • Mysqldump only certain fields of a table

    The trick here is to not use mysqldump

    mysql -u root -p -e "SELECT `field_01` AS 'new_name_01`,`field_02` as `new_name_02` FROM database.schema" -X > /tmp/output.xml

    And to load it back into the new table which exists and has the fields new_name_01 & new_name_02:

    mysql -u root -p --local-infile -e "LOAD XML LOCAL INFILE '/tmp/output.xml' INTO TABLE database.new_schema ROWS IDENTIFIED BY '<row>';"