Git Assume Unchanged

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Git is far and away the best revision control system I've ever used. As evidence, I submit this little gem of a command:

repo$ git update-index --assume-unchanged file1 file2 ...

This is a useful command to use when you want to change a file locally and prevent it from being committed back to the repository. Once you're done and want to re-enable commits of those files, simply re-run the command and use --no-assume-unchanged.

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eCryptfs Failure After Ubuntu Upgrade

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I had my laptop halfway upgraded from Ubuntu 11.10 and 12.04 for a while. There was some reason for that which escapes me now, so I decided to complete the upgrade. So far only one issue has cropped up with an ecryptfs volume that I had created. It failed to mount with an error

Error attempting to evaluate mount options: [-22] Invalid argument

Based on a Redhat bug report I found, it looks like I need to SUID root /sbin/mount.ecryptfs.

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IPv6 Anycast

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IPv6 has a neat feature called Duplicate Address Detection (DAD). When you add an IPv6 address to an interface, it checks to be sure that nobody else is already using that address. That's a Good Thing®. But if you're using IPv6 addresses for anycast and two (or more) devices are on the same subnet it can cause problems. The solution is to not put your anycasted addresses on the shared interface (e.g. eth0); rather, put them on the loopback interface.

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QLandekarteGT and Garmin Devices

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I use QLandkarteGT on Linux to access my Garmin Venture HC GPS. All things considered, it works pretty well. I recently upgraded my computer to Ubuntu 12.04 and it stopped communicating with my GPS though, and I was very sad. The error was "Failed to download waypoints. Failed to configure USB: could not set config 1: Operation not permitted." After tinkering with it I remembered that the way I fixed it before was by setting qlandkartegt to run suid root.

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Android App: Beacon Mission Manager

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Last week I dove in and wrote my first Android app. I've been waiting for a good reason to give it a try and one finally fell into my lap. I'm a volunteer member of a search and rescue team. We use management software from Radishworks.com named Mission Manager. They released an API the other day so I took up the challenge.

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Cleaning Up After Amazon Appstore

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Amazon Appstore for Android has a nasty habid of leaving old files around. This can cause major problems when your SD card fills up and you don't discover it until you're trying to snap a photo. What happens is Amazon downloads the APK file to the SD card and then installs it. That part is fine and necessary, in fact. The problem is the file never gets cleaned up. I can't think of any good reason for that. Maybe there's an argument for leaving it for a brief time, just in case you re-install the app, but not forever.

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SOPA/PIPA Blackout

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Today is the great SOPA/PIPA blackout. These are two proposed bills in Congress which would create a censorship regime for the Internet, much like China, Iran, and Syria have. And we know how great those governments are, so why wouldn't we follow in their footsteps? Wikipedia and Google are the most notable, but thousands of other sites went offline in protest. We at zmonkey.org fully support these actions.

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