$ git clone -n https://src.fedoraproject.org/rpms/Perlbal.git /var/lib/mock/f41-build-1017281-17920/root/chroot_tmpdir/scmroot/Perlbal
Cloning into '/var/lib/mock/f41-build-1017281-17920/root/chroot_tmpdir/scmroot/Perlbal'...
$ git fetch origin e18e2af11ea12c5ec557346b4875bc9f9f0e3714:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Perlbal
 * [new ref]         e18e2af11ea12c5ec557346b4875bc9f9f0e3714 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e18e2af Perl 5.40 re-rebuild of bootstrapped packages