A collection of shorter thoughts, quick updates, and things I’ve learned that don’t warrant a full blog post.
Grafana has a helper in its config files called $__file{/path/to/file} that will read the file at runtime, making it easier to configure secrets via Nix.
SDKMAN can symlink existing Java installations into its own managed thing so we can have the best of both worlds by installing Java from Homebrew but managing the JAVA_HOME with SDKMAN.
GitLab CI pipelines can be executed locally using firecow/gitlab-ci-local This used to be a first party feature within the official gitlab-runner binary but they deleted it citing maintenance burden. What a shame.
Caddy has a handle_path directive that you can use to host services that don’t like being hosted on paths, it will strip the prefix for the underlying service so it sees just the root domain
In Nix it is possible to replace a call to builtins.map with lib.catAttrs if the transformation is just pulling out a field. For example: builtins.map (item: item.field) list can instead just be catAttrs "field" list.
Nix CLI’s flake info subcommand is great to find duplicate inputs, nix-melt is too much manual labor.
In Jetpack Compose you can use rememberUpdatedState to capture values that may update over time but without a full restart of the rememberUpdatedState function.
In a Nix REPL you can run :bl inputs.nixpkgs.legacyPackages.aarch64-linux.pkgs.attic-server to build the derivation and create a result link. Can also run :bl nixosConfigurations.ryzenbox.pkgs.attic-client.
FFmpeg lets you mix videos together from different sources based on a zero-indexed map of input files. For the diagram given below, you can do ffmpeg -i input_0.mp4 -i input_1.mp4 -c copy -map 0:v:0 -map 1:a:0 -shortest output.mp4 to take the video from input_0.mp4 and audio from input_1.mp4.
FFmpeg has support for concatenating files with no re-encoding # file_list.txt file 'source1.mp4' file 'source2.mp4' $ ffmpeg -f concat -safe 0 -i file_list.txt -c copy output.mp4