$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON-PP.git /var/lib/mock/f41-build-816910-150476/root/chroot_tmpdir/scmroot/perl-JSON-PP
Cloning into '/var/lib/mock/f41-build-816910-150476/root/chroot_tmpdir/scmroot/perl-JSON-PP'...
$ git fetch origin 9294cc1bce4271875eadc5ec2c7217d18abc0f30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON-PP
 * [new ref]         9294cc1bce4271875eadc5ec2c7217d18abc0f30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9294cc1 Perl 5.40 re-rebuild of bootstrapped packages