$ git clone -n https://src.fedoraproject.org/rpms/tomcat-native.git /var/lib/mock/f45-build-37260-712/root/chroot_tmpdir/scmroot/tomcat-native
Cloning into '/var/lib/mock/f45-build-37260-712/root/chroot_tmpdir/scmroot/tomcat-native'...
$ git fetch origin 47952a94455ece33a8bbcb4fa2e9ef817bd160c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tomcat-native
 * [new ref]         47952a94455ece33a8bbcb4fa2e9ef817bd160c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47952a9 Update to 2.0.15