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watch_file flake.nix
watch_file flake.lock
DEVENV_ROOT_FILE="$(mktemp)"
printf %s "$PWD" > "$DEVENV_ROOT_FILE"
if ! use flake . --override-input devenv-root "file+file://$DEVENV_ROOT_FILE"
then
echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
fi

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.direnv/
.devenv/
.pre-commit-config.yaml

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LICENSE Normal file
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# musicomp
A simple music compression tool.
If you're anything like me, you obtain music in FLAC format for archival and compress it down to a codec such as Opus for actual listening.
musicomp exists to automate the continuous compression work that would otherwise have to be done manually.
It:
* scans the source and destination directories,
* makes sure the content is properly synchronized (i.e., there are no tracks in destination that don't exist in source and vice versa), and
* compresses the music from FLAC to Opus in parallel.
## Dependencies
musicomp requires `opusenc` in `$PATH` in order to function.
The Nix package wraps musicomp to include `opusenc` out of the box.
## NixOS
A NixOS module is provided within this flake.
Here's an example of how to use it:
```nix
{
self,
lib,
pkgs,
...
}: {
services.musicomp.jobs.main = {
music = "/srv/music";
comp = "/srv/compmusic";
timerConfig = {
OnCalendar = "daily";
Persistent = true;
};
inhibitsSleep = true;
post = let
remoteDir = "/my/music/folder";
rsyncExe = lib.getExe pkgs.rsync;
rsh = "${lib.getExe pkgs.openssh} -i /etc/ssh/ssh_host_ed25519_key -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null";
in ''
${rsyncExe} \
--archive \
--recursive \
--delete \
--update \
--mkpath \
--verbose --verbose \
--exclude lost+found \
--rsh ${lib.escapeShellArg rsh} \
/srv/compmusic/ root@my.server:${remoteDir}
'';
};
}
```

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devenv.nix Normal file
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{
}

307
flake.lock Normal file
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{
"nodes": {
"cachix": {
"inputs": {
"devenv": [
"devenv"
],
"flake-compat": [
"devenv"
],
"git-hooks": [
"devenv"
],
"nixpkgs": "nixpkgs"
},
"locked": {
"lastModified": 1742042642,
"narHash": "sha256-D0gP8srrX0qj+wNYNPdtVJsQuFzIng3q43thnHXQ/es=",
"owner": "cachix",
"repo": "cachix",
"rev": "a624d3eaf4b1d225f918de8543ed739f2f574203",
"type": "github"
},
"original": {
"owner": "cachix",
"ref": "latest",
"repo": "cachix",
"type": "github"
}
},
"devenv": {
"inputs": {
"cachix": "cachix",
"flake-compat": "flake-compat",
"git-hooks": "git-hooks",
"nix": "nix",
"nixpkgs": "nixpkgs_3"
},
"locked": {
"lastModified": 1743783972,
"narHash": "sha256-5wPsNCnWmeLpLxavsftA9L7tnYgtlexV7FwLegxtpy4=",
"owner": "cachix",
"repo": "devenv",
"rev": "2f53e2f867e0c2ba18b880e66169366e5f8ca554",
"type": "github"
},
"original": {
"owner": "cachix",
"repo": "devenv",
"type": "github"
}
},
"devenv-root": {
"flake": false,
"locked": {
"narHash": "sha256-d6xi4mKdjkX2JFicDIv5niSzpyI0m/Hnm8GGAIU04kY=",
"type": "file",
"url": "file:///dev/null"
},
"original": {
"type": "file",
"url": "file:///dev/null"
}
},
"flake-compat": {
"flake": false,
"locked": {
"lastModified": 1733328505,
"narHash": "sha256-NeCCThCEP3eCl2l/+27kNNK7QrwZB1IJCrXfrbv5oqU=",
"owner": "edolstra",
"repo": "flake-compat",
"rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec",
"type": "github"
},
"original": {
"owner": "edolstra",
"repo": "flake-compat",
"type": "github"
}
},
"flake-parts": {
"inputs": {
"nixpkgs-lib": [
"devenv",
"nix",
"nixpkgs"
]
},
"locked": {
"lastModified": 1712014858,
"narHash": "sha256-sB4SWl2lX95bExY2gMFG5HIzvva5AVMJd4Igm+GpZNw=",
"owner": "hercules-ci",
"repo": "flake-parts",
"rev": "9126214d0a59633752a136528f5f3b9aa8565b7d",
"type": "github"
},
"original": {
"owner": "hercules-ci",
"repo": "flake-parts",
"type": "github"
}
},
"flake-parts_2": {
"inputs": {
"nixpkgs-lib": "nixpkgs-lib"
},
"locked": {
"lastModified": 1743550720,
"narHash": "sha256-hIshGgKZCgWh6AYJpJmRgFdR3WUbkY04o82X05xqQiY=",
"owner": "hercules-ci",
"repo": "flake-parts",
"rev": "c621e8422220273271f52058f618c94e405bb0f5",
"type": "github"
},
"original": {
"owner": "hercules-ci",
"repo": "flake-parts",
"type": "github"
}
},
"git-hooks": {
"inputs": {
"flake-compat": [
"devenv"
],
"gitignore": "gitignore",
"nixpkgs": [
"devenv",
"nixpkgs"
]
},
"locked": {
"lastModified": 1742649964,
"narHash": "sha256-DwOTp7nvfi8mRfuL1escHDXabVXFGT1VlPD1JHrtrco=",
"owner": "cachix",
"repo": "git-hooks.nix",
"rev": "dcf5072734cb576d2b0c59b2ac44f5050b5eac82",
"type": "github"
},
"original": {
"owner": "cachix",
"repo": "git-hooks.nix",
"type": "github"
}
},
"gitignore": {
"inputs": {
"nixpkgs": [
"devenv",
"git-hooks",
"nixpkgs"
]
},
"locked": {
"lastModified": 1709087332,
"narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
"owner": "hercules-ci",
"repo": "gitignore.nix",
"rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
"type": "github"
},
"original": {
"owner": "hercules-ci",
"repo": "gitignore.nix",
"type": "github"
}
},
"libgit2": {
"flake": false,
"locked": {
"lastModified": 1697646580,
"narHash": "sha256-oX4Z3S9WtJlwvj0uH9HlYcWv+x1hqp8mhXl7HsLu2f0=",
"owner": "libgit2",
"repo": "libgit2",
"rev": "45fd9ed7ae1a9b74b957ef4f337bc3c8b3df01b5",
"type": "github"
},
"original": {
"owner": "libgit2",
"repo": "libgit2",
"type": "github"
}
},
"nix": {
"inputs": {
"flake-compat": [
"devenv"
],
"flake-parts": "flake-parts",
"libgit2": "libgit2",
"nixpkgs": "nixpkgs_2",
"nixpkgs-23-11": [
"devenv"
],
"nixpkgs-regression": [
"devenv"
],
"pre-commit-hooks": [
"devenv"
]
},
"locked": {
"lastModified": 1741798497,
"narHash": "sha256-E3j+3MoY8Y96mG1dUIiLFm2tZmNbRvSiyN7CrSKuAVg=",
"owner": "domenkozar",
"repo": "nix",
"rev": "f3f44b2baaf6c4c6e179de8cbb1cc6db031083cd",
"type": "github"
},
"original": {
"owner": "domenkozar",
"ref": "devenv-2.24",
"repo": "nix",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1733212471,
"narHash": "sha256-M1+uCoV5igihRfcUKrr1riygbe73/dzNnzPsmaLCmpo=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "55d15ad12a74eb7d4646254e13638ad0c4128776",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs-lib": {
"locked": {
"lastModified": 1743296961,
"narHash": "sha256-b1EdN3cULCqtorQ4QeWgLMrd5ZGOjLSLemfa00heasc=",
"owner": "nix-community",
"repo": "nixpkgs.lib",
"rev": "e4822aea2a6d1cdd36653c134cacfd64c97ff4fa",
"type": "github"
},
"original": {
"owner": "nix-community",
"repo": "nixpkgs.lib",
"type": "github"
}
},
"nixpkgs_2": {
"locked": {
"lastModified": 1717432640,
"narHash": "sha256-+f9c4/ZX5MWDOuB1rKoWj+lBNm0z0rs4CK47HBLxy1o=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "88269ab3044128b7c2f4c7d68448b2fb50456870",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "release-24.05",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_3": {
"locked": {
"lastModified": 1733477122,
"narHash": "sha256-qamMCz5mNpQmgBwc8SB5tVMlD5sbwVIToVZtSxMph9s=",
"owner": "cachix",
"repo": "devenv-nixpkgs",
"rev": "7bd9e84d0452f6d2e63b6e6da29fe73fac951857",
"type": "github"
},
"original": {
"owner": "cachix",
"ref": "rolling",
"repo": "devenv-nixpkgs",
"type": "github"
}
},
"nixpkgs_4": {
"locked": {
"lastModified": 1743827369,
"narHash": "sha256-rpqepOZ8Eo1zg+KJeWoq1HAOgoMCDloqv5r2EAa9TSA=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "42a1c966be226125b48c384171c44c651c236c22",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"devenv": "devenv",
"devenv-root": "devenv-root",
"flake-parts": "flake-parts_2",
"nixpkgs": "nixpkgs_4"
}
}
},
"root": "root",
"version": 7
}

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{
description = "My NixOS configuration";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
flake-parts.url = "github:hercules-ci/flake-parts";
devenv-root = {
url = "file+file:///dev/null";
flake = false;
};
devenv.url = "github:cachix/devenv";
};
outputs = {
self,
nixpkgs,
flake-parts,
...
} @ inputs:
flake-parts.lib.mkFlake {inherit inputs;} {
imports = [
inputs.devenv.flakeModule
];
systems = ["x86_64-linux" "aarch64-linux"];
flake.nixosModules = let
musicomp = import ./nixos/musicomp.nix inputs;
in {
inherit musicomp;
default = musicomp;
};
perSystem = {
pkgs,
inputs',
lib,
...
}: {
devenv.shells.default = {
devenv.root = let
devenvRootFileContent = builtins.readFile inputs.devenv-root.outPath;
in
lib.mkIf (devenvRootFileContent != "") devenvRootFileContent;
name = "musicomp";
imports = [
./devenv.nix
];
};
packages = let
packages = lib.packagesFromDirectoryRecursive {
inherit (pkgs) callPackage;
directory = ./packages;
};
in packages // {
default = packages.musicomp;
};
};
};
}

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self: {
lib,
pkgs,
utils,
config,
...
}: let
inherit (lib) types;
inherit (utils.systemdUtils.unitOptions) unitOption;
in {
options.services.musicomp.jobs = lib.mkOption {
description = ''
Compression jobs to run with musicomp.
'';
default = {};
type = types.attrsOf (types.submodule {
options = {
music = lib.mkOption {
type = types.str;
description = ''
Source directory.
'';
example = "/srv/music";
};
comp = lib.mkOption {
type = types.str;
description = ''
Destination directory for compressed music.
'';
example = "/srv/comp";
};
post = lib.mkOption {
type = types.lines;
default = "";
description = ''
Shell commands that are run after compression has finished.
'';
};
workers = lib.mkOption {
type = lib.types.int;
default = 0;
description = ''
Number of workers. A number less than 1 means that musicomp will use the amount of available processor threads.
'';
};
timerConfig = lib.mkOption {
type = lib.types.nullOr (lib.types.attrsOf unitOption);
default = {
OnCalendar = "daily";
Persistent = true;
};
description = ''
When to run the job.
'';
};
package = lib.mkPackageOption self.packages.${pkgs.system} "musicomp" {};
inhibitsSleep = lib.mkOption {
default = false;
type = lib.types.bool;
example = true;
description = ''
Prevents the system from sleeping while running the job.
'';
};
};
});
};
config = {
systemd.services =
lib.mapAttrs'
(
name: job:
lib.nameValuePair "musicomp-jobs-${name}" {
wantedBy = ["multi-user.target"];
restartIfChanged = false;
script = ''
${lib.optionalString job.inhibitsSleep ''
${lib.getExe' pkgs.systemd "systemd-inhibit"} \
--mode block \
--who musicomp \
--what sleep \
--why ${lib.escapeShellArg "Scheduled musicomp ${name}"}
''}
${lib.getExe job.package} \
${lib.optionalString (job.workers > 0) "--workers ${job.workers}"} \
--verbose \
-- ${job.music} ${job.comp}
'';
postStart = job.post;
serviceConfig.Type = "oneshot";
}
)
config.services.musicomp.jobs;
systemd.timers =
lib.mapAttrs'
(name: job:
lib.nameValuePair "musicomp-jobs-${name}" {
wantedBy = ["timers.target"];
inherit (job) timerConfig;
})
(lib.filterAttrs (_: job: job.timerConfig != null) config.services.musicomp.jobs);
};
}

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{
lib,
python3Packages,
opusTools,
}:
python3Packages.buildPythonApplication {
pname = "musicomp";
version = "0.1.0";
src = ../../.;
pyproject = true;
doCheck = false;
build-system = [python3Packages.hatchling];
makeWrapperArgs = [
"--prefix"
"PATH"
":"
(lib.makeBinPath [opusTools])
];
meta.mainProgram = "musicomp";
}

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pyproject.toml Normal file
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[project]
name = "musicomp"
version = "0.1.0"
description = "Music compression tool"
authors = [{ name = "Lukas Wurzinger", email = "lukas@wrz.one" }]
readme = "README.md"
requires-python = ">=3.12"
license = "Apache-2.0"
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
[project.scripts]
musicomp = "musicomp.cli:main"
[tool.hatch.build.targets.wheel]
packages = ["src/musicomp"]

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src/musicomp/__main__.py Normal file
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from .cli import main
main()

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src/musicomp/clean.py Normal file
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from os import PathLike
from pathlib import Path
def clean(dst: str | PathLike[str]) -> None:
Path(dst).unlink(missing_ok=True)

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import sys
from multiprocessing import Pool, cpu_count
from argparse import ArgumentParser, ArgumentTypeError, Namespace
from pathlib import Path
from .todo import Todo
args = Namespace()
def task(todo: Todo) -> None:
todo.run()
if args.verbose:
print("finished", todo, file=sys.stderr)
def main():
def workers_type_func(value: object) -> int:
try:
value = int(value) # pyright: ignore[reportArgumentType]
if value <= 0:
raise ArgumentTypeError(f"{value} is not a positive integer")
except ValueError:
raise ArgumentTypeError(f"{value} is not an integer")
return value
parser = ArgumentParser()
_ = parser.add_argument(
"-w",
"--workers",
default=cpu_count(),
type=workers_type_func,
help="amount of worker processes",
)
_ = parser.add_argument(
"-i",
"--interactive",
action="store_true",
help="prompt before running",
)
_ = parser.add_argument(
"-k",
"--keep",
action="store_true",
help="whether source files should be kept if both directories are the same",
)
_ = parser.add_argument(
"-r",
"--redo",
action="store_true",
help="whether everything should be re-encoded regardless of whether they have already been transcoded",
)
_ = parser.add_argument(
"-v",
"--verbose",
action="count",
default=0,
help="verbose output",
)
_ = parser.add_argument(
"music",
nargs=1,
type=Path,
help="the source directory",
)
_ = parser.add_argument(
"comp",
nargs=1,
type=Path,
help="the destination directory for compressed files",
)
global args
args = parser.parse_args(sys.argv[1:])
assert isinstance(args.workers, int) # pyright: ignore[reportAny]
assert isinstance(args.interactive, bool) # pyright: ignore[reportAny]
assert isinstance(args.keep, bool) # pyright: ignore[reportAny]
assert isinstance(args.redo, bool) # pyright: ignore[reportAny]
assert isinstance(args.verbose, int) # pyright: ignore[reportAny]
assert isinstance(args.music, list) # pyright: ignore[reportAny]
assert len(args.music) == 1 # pyright: ignore[reportUnknownMemberType, reportUnknownArgumentType]
assert isinstance(args.music[0], Path) # pyright: ignore[reportUnknownMemberType]
assert isinstance(args.comp, list) # pyright: ignore[reportAny]
assert len(args.comp) == 1 # pyright: ignore[reportUnknownMemberType, reportUnknownArgumentType]
assert isinstance(args.comp[0], Path) # pyright: ignore[reportUnknownMemberType]
src_dir = args.music[0] # pyright: ignore[reportUnknownMemberType]
dst_dir = args.comp[0] # pyright: ignore[reportUnknownMemberType]
plan = list(
Todo.plan(
src_dir,
dst_dir,
replace=src_dir.samefile(dst_dir) and not args.keep,
redo=args.redo,
)
)
if len(plan) == 0:
print("Nothing to do", file=sys.stderr)
sys.exit(0)
if args.verbose >= 1 or args.interactive:
print("Plan:", file=sys.stderr)
for todo in plan:
print(todo, file=sys.stderr)
if args.interactive:
result = input("Do you want to continue? [Y/n] ")
if result.lower() not in ("", "y", "yes"):
sys.exit(1)
with Pool(args.workers) as pool:
_ = pool.map(task, plan)

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from os import PathLike
from pathlib import Path
def replace(src: str | PathLike[str]) -> None:
Path(src).unlink(missing_ok=True)

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from pathlib import Path
from os import PathLike
from enum import StrEnum
from dataclasses import dataclass
from typing import Self, override
from collections.abc import Generator
from .transcode import transcode as todo_transcode
from .clean import clean as todo_clean
from .replace import replace as todo_replace
SRC_SUFFIX = ".flac"
DST_SUFFIX = ".opus"
class TodoAct(StrEnum):
TRANSCODE = "transcode"
CLEAN = "clean"
REPLACE = "replace"
@dataclass
class Todo:
act: TodoAct
src: str | PathLike[str]
dst: str | PathLike[str]
@classmethod
def plan(
cls: type[Self],
src_dir: str | PathLike[str],
dst_dir: str | PathLike[str],
replace: bool = False,
redo: bool = False,
) -> Generator[Self]:
def list_files(dir: str | PathLike[str], suffix: str) -> list[Path]:
files: list[Path] = []
for f in Path(dir).rglob("*"):
if f.is_file() and f.suffix == suffix:
files.append(f)
return files
src_files = list_files(src_dir, SRC_SUFFIX)
dst_files = list_files(dst_dir, DST_SUFFIX)
for f in src_files:
e = dst_dir / (f.relative_to(src_dir).with_suffix(DST_SUFFIX))
if redo or e not in dst_files:
yield cls(TodoAct.TRANSCODE, f, e)
if replace:
yield cls(TodoAct.REPLACE, f, e)
for f in dst_files:
e = src_dir / (f.relative_to(dst_dir).with_suffix(SRC_SUFFIX))
if e not in src_files:
yield cls(TodoAct.CLEAN, f, e)
def run(self) -> None:
match self.act:
case TodoAct.TRANSCODE:
todo_transcode(self.src, self.dst)
case TodoAct.CLEAN:
todo_clean(self.dst)
case TodoAct.REPLACE:
todo_replace(self.src)
@override
def __str__(self) -> str:
return f"{self.act} {self.src} -> {self.dst}"

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from pathlib import Path
from subprocess import run
from os import PathLike
class TranscodingError(Exception):
pass
def transcode(src: str | PathLike[str], dst: str | PathLike[str]) -> None:
dst = Path(dst)
dst.parent.mkdir(parents=True, exist_ok=True)
if dst.is_file():
dst.unlink()
opusenc: tuple[str, ...] = (
"opusenc",
"--quiet",
"--bitrate",
"96.000",
"--music",
"--vbr",
"--comp",
"10",
"--",
str(src),
str(dst),
)
cp = run(opusenc)
if cp.returncode != 0:
raise TranscodingError(f"opusenc exited with code {cp.returncode}")