$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON-PP.git /var/lib/mock/f45-build-24282-603/root/chroot_tmpdir/scmroot/perl-JSON-PP
Cloning into '/var/lib/mock/f45-build-24282-603/root/chroot_tmpdir/scmroot/perl-JSON-PP'...
$ git fetch origin 417ac9bd9fdf877a98b8ebfcffb939ac083e0efa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON-PP
 * [new ref]         417ac9bd9fdf877a98b8ebfcffb939ac083e0efa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 417ac9b Perl 5.44 re-rebuild of bootstrapped packages