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