$ git clone -n https://src.fedoraproject.org/rpms/tomcatjss.git /var/lib/mock/f38-build-side-42-init-devel-688263-26774/root/chroot_tmpdir/scmroot/tomcatjss
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-688263-26774/root/chroot_tmpdir/scmroot/tomcatjss'...
$ git fetch origin 1941b9c5f14ada1101db0a4df0829c433d08e4e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tomcatjss
 * [new ref]         1941b9c5f14ada1101db0a4df0829c433d08e4e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1941b9c Rebase to Tomcat JSS 8.3.0