$ git clone -n https://src.fedoraproject.org/rpms/gnome-music.git /var/lib/mock/f39-build-1771096-41502/root/chroot_tmpdir/scmroot/gnome-music
Cloning into '/var/lib/mock/f39-build-1771096-41502/root/chroot_tmpdir/scmroot/gnome-music'...
$ git fetch origin 4b6896cea6d3ca0a29de670728f823d726db6861:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-music
 * [new ref]         4b6896cea6d3ca0a29de670728f823d726db6861 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b6896c Update to 45.0