$ git clone -n https://src.fedoraproject.org/rpms/createrepo_c.git /var/lib/mock/f40-build-2196113-51554/root/chroot_tmpdir/scmroot/createrepo_c
Cloning into '/var/lib/mock/f40-build-2196113-51554/root/chroot_tmpdir/scmroot/createrepo_c'...
$ git fetch origin 31b2994c789db32020cb2fd0401da219dbd3418d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/createrepo_c
 * [new ref]         31b2994c789db32020cb2fd0401da219dbd3418d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31b2994 Add 0001-build-Restore-compatiblity-with-libxml2-2.12.0.patch