$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Digest.git /var/lib/mock/f41-build-766308-13472/root/chroot_tmpdir/scmroot/perl-IO-Digest
Cloning into '/var/lib/mock/f41-build-766308-13472/root/chroot_tmpdir/scmroot/perl-IO-Digest'...
$ git fetch origin acd584d14c4ad250c0dddcbad7a3c798243a6262:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Digest
 * [new ref]         acd584d14c4ad250c0dddcbad7a3c798243a6262 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acd584d Eliminate use of obsolete %patchN syntax (#2283636)