$ git clone -n https://src.fedoraproject.org/rpms/g4music.git /var/lib/mock/f40-build-1463611-23585/root/chroot_tmpdir/scmroot/g4music
Cloning into '/var/lib/mock/f40-build-1463611-23585/root/chroot_tmpdir/scmroot/g4music'...
$ git fetch origin a19abb811552676a1c55168956f25cdd9bf3a2aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g4music
 * [new ref]         a19abb811552676a1c55168956f25cdd9bf3a2aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a19abb8 Version 3.7.2