$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ruby-shadow.git /var/lib/mock/f41-build-1093593-19988/root/chroot_tmpdir/scmroot/rubygem-ruby-shadow
Cloning into '/var/lib/mock/f41-build-1093593-19988/root/chroot_tmpdir/scmroot/rubygem-ruby-shadow'...
$ git fetch origin 46d7ffc9ee00ca7e2316d4970363eef7c03bc3f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ruby-shadow
 * [new ref]         46d7ffc9ee00ca7e2316d4970363eef7c03bc3f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46d7ffc Eliminate use of obsolete %patchN syntax (#2283636)