$ git clone -n https://src.fedoraproject.org/rpms/perl-Time-OlsonTZ-Download.git /var/lib/mock/f41-build-898908-16975/root/chroot_tmpdir/scmroot/perl-Time-OlsonTZ-Download
Cloning into '/var/lib/mock/f41-build-898908-16975/root/chroot_tmpdir/scmroot/perl-Time-OlsonTZ-Download'...
$ git fetch origin 521e8e1438dfdec978ad0a876a40ef8e4968f2ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Time-OlsonTZ-Download
 * [new ref]         521e8e1438dfdec978ad0a876a40ef8e4968f2ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 521e8e1 Eliminate use of obsolete %patchN syntax (#2283636)