2022-01-09 12:30:03 +01:00
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{ depot, pkgs, lib, ... }:
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# ytextr is a wrapper arount yt-dlp (previously youtube-dl)
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# that extracts a single video according to my preferred settings.
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#
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# It will be sandboxed to the current directory, since I don’t particularly
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# trust the massive codebase of that tool (with hundreds of contributors).
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#
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# Since the rules for downloading videos is usually against the wishes
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# of proprietary vendors, and a video is many megabytes anyway,
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# it will be fetched from the most recent nixpkgs unstable channel before running.
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let
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bins = depot.nix.getBins pkgs.nix [ "nix-build" ]
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// depot.nix.getBins pkgs.bubblewrap [ "bwrap" ];
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# Run a command, with the given packages in scope, and `packageNamesAtRuntime` being fetched at the start in the given nix `channel`.
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nix-run-with-channel =
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{
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# The channel to get `packageNamesAtRuntime` from
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channel
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, # executable to run with `packageNamesAtRuntime` in PATH
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# and the argv
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executable
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, # A list of nixpkgs package attribute names that should be put into PATH when running `command`.
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packageNamesAtRuntime
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,
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}: depot.nix.writeExecline "nix-run-with-channel-${channel}" { } [
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# TODO: prevent race condition by writing a temporary gc root
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"backtick"
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"-iE"
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"storepath"
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[
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bins.nix-build
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"-I"
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"nixpkgs=channel:${channel}"
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"--arg"
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"packageNamesAtRuntimeJsonPath"
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(pkgs.writeText "packageNamesAtRuntime.json" (builtins.toJSON packageNamesAtRuntime))
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./create-symlink-farm.nix
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]
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"importas"
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"-ui"
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"PATH"
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"PATH"
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"export"
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2022-01-30 17:06:58 +01:00
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"PATH"
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2022-01-09 12:30:03 +01:00
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"\${storepath}/bin:\${PATH}"
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executable
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"$@"
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];
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in
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nix-run-with-channel {
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channel = "nixos-unstable";
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packageNamesAtRuntime = [ "yt-dlp" ];
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executable = depot.nix.writeExecline "ytextr" { readNArgs = 1; } [
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"getcwd"
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"-E"
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"cwd"
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bins.bwrap
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"--ro-bind"
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"/nix/store"
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"/nix/store"
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"--ro-bind"
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"/etc"
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"/etc"
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"--bind"
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"$cwd"
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"$cwd"
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"yt-dlp"
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"--no-playlist"
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"--write-sub"
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"--all-subs"
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"--embed-subs"
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"--merge-output-format"
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"mkv"
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"-f"
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"bestvideo[height<=?1080]+bestaudio/best"
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"$1"
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];
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}
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