$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime-Format-W3CDTF.git /var/lib/mock/f41-build-1115257-20214/root/chroot_tmpdir/scmroot/perl-DateTime-Format-W3CDTF
Cloning into '/var/lib/mock/f41-build-1115257-20214/root/chroot_tmpdir/scmroot/perl-DateTime-Format-W3CDTF'...
$ git fetch origin 52b1d28fd5b190852b9d03d18e61014f521ce379:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime-Format-W3CDTF
 * [new ref]         52b1d28fd5b190852b9d03d18e61014f521ce379 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52b1d28 Eliminate use of obsolete %patchN syntax (#2283636)