$ git clone -n https://src.fedoraproject.org/rpms/perl-Unix-Process.git /var/lib/mock/f41-build-1139268-20898/root/chroot_tmpdir/scmroot/perl-Unix-Process
Cloning into '/var/lib/mock/f41-build-1139268-20898/root/chroot_tmpdir/scmroot/perl-Unix-Process'...
$ git fetch origin 413f558a3ba5b4ed8b0c62e9a35cd5ac057bbf58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unix-Process
 * [new ref]         413f558a3ba5b4ed8b0c62e9a35cd5ac057bbf58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 413f558 Eliminate use of obsolete %patchN syntax (#2283636)