$ git clone -n https://src.fedoraproject.org/rpms/openxr.git /var/lib/mock/f42-build-side-1-3504961-45986/root/chroot_tmpdir/scmroot/openxr
Cloning into '/var/lib/mock/f42-build-side-1-3504961-45986/root/chroot_tmpdir/scmroot/openxr'...
$ git fetch origin 89ac24991f97e02178316fbc94018f88aa393286:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openxr
 * [new ref]         89ac24991f97e02178316fbc94018f88aa393286 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89ac249 Update to 1.1.47 (rhbz#2358506)