added daemon installation for Fedora

user instance of systemd can handle the ytdl_server.py as daemon for us.

also use virtualenv for pip installed user package to not ever clash with
site-packages where all/most of things is rpm managed

install-fedora.sh

@@ -0,0 +1,38 @@
+#! /bin/bash
+set -ex
+
+YMPV_DIR="$(readlink -f "$(dirname "$0")")"
+VENV="${XDG_DATA_HOME:-$YMPV_DIR}/.youtube-mpv-venv"
+CFGDIR="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user"
+
+
+# install dependencies
+
+if ! (which pip && which virtualenv) > /dev/null; then
+    sudo dnf install -y python-pip python-virtualenv
+fi
+[[ -e "$VENV/bin/activate" ]] || virtualenv "$VENV"
+source "$VENV/bin/activate"
+python -m youtube_dl --help &> /dev/null || pip install youtube_dl
+
+
+# register as systemd service
+
+mkdir -p "$CFGDIR"
+cat > "$CFGDIR/youtube-mpv.service" <<EOF
+[Unit]
+Description=Python server which can play youtube links
+
+[Service]
+Type=simple
+ExecStart=${VENV}/bin/python "${YMPV_DIR}/ytdl_server.py"
+
+[Install]
+WantedBy=default.target
+EOF
+
+# start the service
+
+systemctl --user daemon-reload
+systemctl --user restart youtube-mpv
+systemctl --user enable youtube-mpv