$ git clone -n https://src.fedoraproject.org/rpms/PyMca.git /var/lib/mock/f40-build-734637-105990/root/chroot_tmpdir/scmroot/PyMca
Cloning into '/var/lib/mock/f40-build-734637-105990/root/chroot_tmpdir/scmroot/PyMca'...
$ git fetch origin aba64eb342521dafc2f48293da7a4ea4895c8987:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/PyMca
 * [new ref]         aba64eb342521dafc2f48293da7a4ea4895c8987 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aba64eb Version 5.9.1