$ git clone -n https://src.fedoraproject.org/rpms/newscache.git /var/lib/mock/f41-build-772668-13507/root/chroot_tmpdir/scmroot/newscache
Cloning into '/var/lib/mock/f41-build-772668-13507/root/chroot_tmpdir/scmroot/newscache'...
$ git fetch origin 92cc31d71e8daa5af819716db36478dd08794c0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/newscache
 * [new ref]         92cc31d71e8daa5af819716db36478dd08794c0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 92cc31d Eliminate use of obsolete %patchN syntax (#2283636)