{ lib, runCommand, transmission_3_noSystemd, rqbit, writeShellScript, formats, cacert, rsync }: let urlRegexp = ''.*xt=urn:bt[im]h:([^&]{64}|[^&]{40}).*''; in { url , name ? if (builtins.match urlRegexp url) == null then "bittorrent" else "bittorrent-" + builtins.head (builtins.match urlRegexp url) , config ? if (backend == "transmission") then { } else throw "json config for configuring fetchFromBitorrent only works with the transmission backend" , hash , backend ? "transmission" , recursiveHash ? true , postFetch ? "" , postUnpack ? "" , meta ? {} }: let afterSuccess = writeShellScript "fetch-bittorrent-done.sh" '' ${postUnpack} # Flatten the directory, so that only the torrent contents are in $out, not # the folder name shopt -s dotglob mv -v $downloadedDirectory/*/* $out rm -v -rf $downloadedDirectory unset downloadedDirectory ${postFetch} kill $PPID ''; jsonConfig = (formats.json {}).generate "jsonConfig" config; in runCommand name { inherit meta; nativeBuildInputs = [ cacert ] ++ (if (backend == "transmission" ) then [ transmission_3_noSystemd ] else if (backend == "rqbit") then [ rqbit ] else throw "rqbit or transmission are the only available backends for fetchtorrent"); outputHashAlgo = if hash != "" then null else "sha256"; outputHash = hash; outputHashMode = if recursiveHash then "recursive" else "flat"; # url will be written to the derivation, meaning it can be parsed and utilized # by external tools, such as tools that may want to seed fetchtorrent calls # in nixpkgs inherit url; } (if (backend == "transmission") then '' export HOME=$TMP export downloadedDirectory=$out/downloadedDirectory mkdir -p $downloadedDirectory mkdir -p $HOME/.config/transmission cp ${jsonConfig} $HOME/.config/transmission/settings.json function handleChild { # This detects failures and logs the contents of the transmission fetch find $out exit 0 } trap handleChild CHLD transmission-cli --port $(shuf -n 1 -i 49152-65535) --portmap --finish ${afterSuccess} --download-dir $downloadedDirectory --config-dir "$HOME"/.config/transmission "$url" '' else '' export HOME=$TMP rqbit --disable-dht-persistence --http-api-listen-addr "127.0.0.1:$(shuf -n 1 -i 49152-65535)" download -o $out --exit-on-finish "$url" '')