$ git clone -n https://src.fedoraproject.org/rpms/baobab.git /var/lib/mock/f39-build-1578255-37993/root/chroot_tmpdir/scmroot/baobab
Cloning into '/var/lib/mock/f39-build-1578255-37993/root/chroot_tmpdir/scmroot/baobab'...
$ git fetch origin 729a7e5dcec7ad31dd69b54afa609346a9829891:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/baobab
 * [new ref]         729a7e5dcec7ad31dd69b54afa609346a9829891 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 729a7e5 Update to 45.0