$ git clone -n https://src.fedoraproject.org/rpms/perl-V.git /var/lib/mock/f39-build-1840579-41980/root/chroot_tmpdir/scmroot/perl-V
Cloning into '/var/lib/mock/f39-build-1840579-41980/root/chroot_tmpdir/scmroot/perl-V'...
$ git fetch origin 4a9d3de23ec654a1b972ec9545cdf3adf896bad9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-V
 * [new ref]         4a9d3de23ec654a1b972ec9545cdf3adf896bad9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a9d3de Upgrade to new upstream.