$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime-Format-Duration.git /var/lib/mock/f41-build-1115263-20214/root/chroot_tmpdir/scmroot/perl-DateTime-Format-Duration
Cloning into '/var/lib/mock/f41-build-1115263-20214/root/chroot_tmpdir/scmroot/perl-DateTime-Format-Duration'...
$ git fetch origin c2b52810a2105a773e5743e1ed731f5e9ae30a07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime-Format-Duration
 * [new ref]         c2b52810a2105a773e5743e1ed731f5e9ae30a07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2b5281 Eliminate use of obsolete %patchN syntax (#2283636)