$ git clone -n https://src.fedoraproject.org/rpms/kguitar.git /var/lib/mock/f40-build-2210487-52181/root/chroot_tmpdir/scmroot/kguitar
Cloning into '/var/lib/mock/f40-build-2210487-52181/root/chroot_tmpdir/scmroot/kguitar'...
$ git fetch origin 9681bce9528ff874e5d0e97dcc79d552284dc790:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kguitar
 * [new ref]         9681bce9528ff874e5d0e97dcc79d552284dc790 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9681bce Fix build with autoconf 2.72