$ git clone -n https://src.fedoraproject.org/rpms/maven-reporting-api.git /var/lib/mock/f40-build-2721458-73080/root/chroot_tmpdir/scmroot/maven-reporting-api
Cloning into '/var/lib/mock/f40-build-2721458-73080/root/chroot_tmpdir/scmroot/maven-reporting-api'...
$ git fetch origin 989915c507a072581affbc30fdefc3fb7453d9a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-reporting-api
 * [new ref]         989915c507a072581affbc30fdefc3fb7453d9a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 989915c Build for JDK 8 at a minimum (rhbz#2266673)