$ git clone -n https://src.fedoraproject.org/rpms/tomcat-taglibs-parent.git /var/lib/mock/f41-build-side-1-2762324-31842/root/chroot_tmpdir/scmroot/tomcat-taglibs-parent
Cloning into '/var/lib/mock/f41-build-side-1-2762324-31842/root/chroot_tmpdir/scmroot/tomcat-taglibs-parent'...
$ git fetch origin 37ca8087ade28214285c4d07ad8a9b7470cac762:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tomcat-taglibs-parent
 * [new ref]         37ca8087ade28214285c4d07ad8a9b7470cac762 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37ca808 convert ASL 2.0 license to SPDX