$ git clone -n https://src.fedoraproject.org/rpms/perl-threads-lite.git /var/lib/mock/f42-build-side-1-3499015-45964/root/chroot_tmpdir/scmroot/perl-threads-lite
Cloning into '/var/lib/mock/f42-build-side-1-3499015-45964/root/chroot_tmpdir/scmroot/perl-threads-lite'...
$ git fetch origin 99f4e5b14f30fbe978f6c53bc7669a2c9702697f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-threads-lite
 * [new ref]         99f4e5b14f30fbe978f6c53bc7669a2c9702697f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99f4e5b Modernize a spec file