$ git clone -n https://src.fedoraproject.org/rpms/vtable-dumper.git /var/lib/mock/f45-build-38203-722/root/chroot_tmpdir/scmroot/vtable-dumper
Cloning into '/var/lib/mock/f45-build-38203-722/root/chroot_tmpdir/scmroot/vtable-dumper'...
$ git fetch origin b3e8390c57bed506318aee96f29c44b5405b4b1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vtable-dumper
 * [new ref]         b3e8390c57bed506318aee96f29c44b5405b4b1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3e8390 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild