$ git clone -n https://src.fedoraproject.org/rpms/guile30.git /var/lib/mock/f40-build-2209865-52168/root/chroot_tmpdir/scmroot/guile30
Cloning into '/var/lib/mock/f40-build-2209865-52168/root/chroot_tmpdir/scmroot/guile30'...
$ git fetch origin 6d21044f8613b817230d43996525c240a10bd805:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile30
 * [new ref]         6d21044f8613b817230d43996525c240a10bd805 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d21044 Drop obsolete install-info scriptlets