$ git clone -n https://src.fedoraproject.org/rpms/egl-gbm.git /var/lib/mock/f40-build-801991-143908/root/chroot_tmpdir/scmroot/egl-gbm
Cloning into '/var/lib/mock/f40-build-801991-143908/root/chroot_tmpdir/scmroot/egl-gbm'...
$ git fetch origin e76ce7151eaf5dd46e23aa4fee2163b843938d13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/egl-gbm
 * [new ref]         e76ce7151eaf5dd46e23aa4fee2163b843938d13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e76ce71 Add an epoch as some fool addded an epoch to their thirdparty repo!