Emma ThorpeandClaude Opus 5
177761bb75
Apple's Music app cannot read FLAC, so getting a lossless library onto an iPod requires a converted copy somewhere. This keeps that copy beside the library on a NAS rather than on a laptop, and keeps it current unattended. Walks a source tree and reproduces it path for path as MP3: tags and cover art carried across, already-MP3 sources copied rather than re-encoded, and mirror files whose source has gone deleted along with any directories they emptied. The source library is never written to. Freshness is tracked by modification time -- an encoded file is stamped with its source's mtime, so a file is stale exactly when the two differ. That keeps runs idempotent without a database that could fall out of step with whatever owns the library, which here is Lidarr. Encodes go to a temporary file and are renamed into place, so an interrupted run cannot leave a truncated MP3 that the next run mistakes for finished work. A lock file in the mirror root prevents overlapping passes. Ships as a Python package with a console script, a container image with a TrueNAS Scale compose file, and a Nix flake providing the package, an overlay and a dev shell. The test suite runs real ffmpeg encodes rather than mocks -- the failures worth catching are in what ffmpeg does with tags, cover art and container formats. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
43 lines
1.1 KiB
Nix
43 lines
1.1 KiB
Nix
{
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description = "Maintain a lossy MP3 mirror of a lossless music library";
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inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
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outputs =
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{ self, nixpkgs }:
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let
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systems = [
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"x86_64-linux"
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"aarch64-linux"
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"x86_64-darwin"
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"aarch64-darwin"
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];
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forAllSystems = fn: nixpkgs.lib.genAttrs systems (system: fn nixpkgs.legacyPackages.${system});
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in
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{
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overlays.default = final: _prev: {
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music-mirror = final.callPackage ./package.nix { };
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};
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packages = forAllSystems (pkgs: rec {
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music-mirror = pkgs.callPackage ./package.nix { };
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default = music-mirror;
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});
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# The package builds only if the test suite passes, so this covers both.
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checks = forAllSystems (pkgs: { inherit (self.packages.${pkgs.system}) music-mirror; });
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devShells = forAllSystems (pkgs: {
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default = pkgs.mkShellNoCC {
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packages = [
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pkgs.python3
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pkgs.python3Packages.pytest
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pkgs.ffmpeg
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];
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};
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});
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formatter = forAllSystems (pkgs: pkgs.nixfmt-tree);
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};
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}
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