$ git clone -n https://src.fedoraproject.org/rpms/xmms2.git /var/lib/mock/f42-build-865239-172845/root/chroot_tmpdir/scmroot/xmms2
Cloning into '/var/lib/mock/f42-build-865239-172845/root/chroot_tmpdir/scmroot/xmms2'...
$ git fetch origin fb191d0a194cbd17e934da82172b7d3876b15a89:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmms2
 * [new ref]         fb191d0a194cbd17e934da82172b7d3876b15a89 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb191d0 Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.4