$ git clone -n https://src.fedoraproject.org/rpms/botan2.git /var/lib/mock/f41-build-1034387-18630/root/chroot_tmpdir/scmroot/botan2
Cloning into '/var/lib/mock/f41-build-1034387-18630/root/chroot_tmpdir/scmroot/botan2'...
$ git fetch origin e49932983f993d35472e59b8803459bf4370c2c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/botan2
 * [new ref]         e49932983f993d35472e59b8803459bf4370c2c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e499329 Fix intermittent assertions when running tests with newer gcc