$ git clone -n https://src.fedoraproject.org/rpms/tomcat.git /var/lib/mock/f39-build-1581695-38093/root/chroot_tmpdir/scmroot/tomcat
Cloning into '/var/lib/mock/f39-build-1581695-38093/root/chroot_tmpdir/scmroot/tomcat'...
$ git fetch origin 79c34c7f77de3bdee88862fdbe4b59e422a04c5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tomcat
 * [new ref]         79c34c7f77de3bdee88862fdbe4b59e422a04c5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79c34c7 Update tomcat-9.0.conf file