$ git clone -n https://src.fedoraproject.org/rpms/setserial.git /var/lib/mock/f41-build-1190203-22180/root/chroot_tmpdir/scmroot/setserial
Cloning into '/var/lib/mock/f41-build-1190203-22180/root/chroot_tmpdir/scmroot/setserial'...
$ git fetch origin 962e5a4ef216985a89663118b282cf11d234509d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/setserial
 * [new ref]         962e5a4ef216985a89663118b282cf11d234509d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 962e5a4 Eliminate use of obsolete %patchN syntax (#2283636)