$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-IRC.git /var/lib/mock/f41-build-1287190-23295/root/chroot_tmpdir/scmroot/perl-Net-IRC
Cloning into '/var/lib/mock/f41-build-1287190-23295/root/chroot_tmpdir/scmroot/perl-Net-IRC'...
$ git fetch origin 8fbd38d12424b3d7479aecbcb32cc4e283f614c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-IRC
 * [new ref]         8fbd38d12424b3d7479aecbcb32cc4e283f614c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fbd38d Eliminate use of obsolete %patchN syntax (#2283636)