$ git clone -n https://src.fedoraproject.org/rpms/python-webtest.git /var/lib/mock/f41-build-1032035-18543/root/chroot_tmpdir/scmroot/python-webtest
Cloning into '/var/lib/mock/f41-build-1032035-18543/root/chroot_tmpdir/scmroot/python-webtest'...
$ git fetch origin a630e2d5a8a38fccc40e2078c05b715553b184fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-webtest
 * [new ref]         a630e2d5a8a38fccc40e2078c05b715553b184fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a630e2d Add buildrequires on legacy-cgi module