January 12, 2021

Edit files in (remote) Docker containers

I always had problems remembering Docker commands: to run a shell in a container, should I use docker run or docker exec? Wait, I probably need to "attach" the terminal to the running container. No problem, let's try docker attach. Ooops...

These commands initially made no much sense to me - run and exec sounds like an alias to me and attach; well, Docker authors clearly had the idea that attaching to container and attaching shell input (typing commands inside container shell) are entirely unrelated things.

Because of this, I kept personal docker.org file with all the notes how I'm going to start a container, run something in it, and so on.

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April 26, 2020

Open (un)compressed file in Emacs

In Emacs, when you open a compressed file like foo.txt.gz, it will transparently decompress it (using gzip in the case above) and open as a regular file. However, what will happen if the above file is not compressed at all?

Here is my case. I'm using excellent rclone to open remote S3 drives by mounting them in the local folder. From there, Emacs and dired works much better than any TRAMP hack I tried.

However, an application that would ship logs to S3, would ship them with gzip extension attached (hence foo.txt.gz), but files would not be compressed. I'm not sure if this behavior is intentional or bug in the script, but this will cause Emacs to fail with this error:

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February 25, 2020

Log4j2 and Clojure quick setup

As we all know, java logging is a mess and I believe most developers are wondering how the output to terminal or file can be rocket science?

Those who want to save some sanity and keep things simple, I'm sure are already are using Timbre.

But, my use case was different - the application had to log as much as possible, but that had to be fast as possible and provide plenty of configurable options for the end-user, without touching source code.

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