The previous flow required the operator to manually install yt-dlp on the
server. Now the server downloads the correct binary for the current OS/arch
from GitHub Releases (latest) the first time a playlist fetch is requested,
caches it under %appdata%/.mc_custom (resolved per-OS), chmod +x's it on
POSIX, and skips the download on every subsequent call.
- shared/paths.ts: add getAppDataDir() + getMcCustomDir() that map %appdata%
to ~/.config (Linux), ~/Library/Application Support (macOS), or
process.env.APPDATA (Windows) so the path is OS-agnostic.
- server/youtube.ts: replace the old "probe PATH and bail" probeYtDlp with
ensureYtDlp(): picks the right GitHub asset name per platform.arch
(yt-dlp.exe / yt-dlp_macos / yt-dlp_linux / yt-dlp_linux_aarch64 /
yt-dlp_linux_armv7l), downloads it with redirect-following https.get to
the install path, chmods +x, then verifies with `--version` before
reporting success. Uses an installPromise singleton so concurrent
requests don't race the download. On any failure it cleans up the
partial file and throws YtDlpUnavailableError with a real reason.
- docs/yt-dlp-setup.md: note that auto-install is now the default; manual
install is only for environments where the auto-download fails.
Smoke-tested on this Linux x64 box: first call downloads to
~/.config/.mc_custom/yt-dlp_linux and reports `2026.03.17`; second call
takes ~700ms (just the version probe) and reuses the cached file.
claude-bot
7349d4e71e