$ git clone -n https://src.fedoraproject.org/rpms/perl.git /var/lib/mock/f41-build-side-1-3070210-38790/root/chroot_tmpdir/scmroot/perl
Cloning into '/var/lib/mock/f41-build-side-1-3070210-38790/root/chroot_tmpdir/scmroot/perl'...
$ git fetch origin 6d820c7ef2bdcb5dbbf98e02ad1e354415b137f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl
 * [new ref]         6d820c7ef2bdcb5dbbf98e02ad1e354415b137f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d820c7 Removed unnecessary conversion (rhbz#2318488)