$ git clone -n https://src.fedoraproject.org/rpms/scrub.git /var/lib/mock/f41-build-1190190-22180/root/chroot_tmpdir/scmroot/scrub
Cloning into '/var/lib/mock/f41-build-1190190-22180/root/chroot_tmpdir/scmroot/scrub'...
$ git fetch origin c4f0d93d026b24560b410b3a8d75b34c100a2b7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scrub
 * [new ref]         c4f0d93d026b24560b410b3a8d75b34c100a2b7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4f0d93 Eliminate use of obsolete %patchN syntax (#2283636)