60 lines
2.1 KiB
Nix
60 lines
2.1 KiB
Nix
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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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# 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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}: depot.nix.writeExecline "nix-run-with-channel-${channel}" {} [
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# TODO: prevent race condition by writing a temporary gc root
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"backtick" "-iE" "storepath" [
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bins.nix-build
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"-I" "nixpkgs=channel:${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" "-ui" "PATH" "PATH"
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"export" "PATH" "\${storepath}/bin:\${PATH}"
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executable "$@"
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];
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in nix-run-with-channel {
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channel = "nixos-unstable";
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packageNamesAtRuntime = [ "yt-dlp" ];
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executable = depot.nix.writeExecline "ytextr" { readNArgs = 1; } [
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"getcwd" "-E" "cwd"
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bins.bwrap
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"--ro-bind" "/nix/store" "/nix/store"
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"--ro-bind" "/etc" "/etc"
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"--bind" "$cwd" "$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" "mkv"
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"-f" "bestvideo[height<=?1080]+bestaudio/best"
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"$1"
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];
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}
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