$ git clone -n https://src.fedoraproject.org/rpms/libkexiv2.git /var/lib/mock/f42-build-3273281-41310/root/chroot_tmpdir/scmroot/libkexiv2
Cloning into '/var/lib/mock/f42-build-3273281-41310/root/chroot_tmpdir/scmroot/libkexiv2'...
$ git fetch origin 0fac2ff700dba24afa08078440b8902fd71d7349:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libkexiv2
 * [new ref]         0fac2ff700dba24afa08078440b8902fd71d7349 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fac2ff Rebuild for ppc64le enablement