$ git clone -n https://src.fedoraproject.org/rpms/R-highlight.git /var/lib/mock/f42-build-side-1-3499315-45964/root/chroot_tmpdir/scmroot/R-highlight
Cloning into '/var/lib/mock/f42-build-side-1-3499315-45964/root/chroot_tmpdir/scmroot/R-highlight'...
$ git fetch origin 10d9328b9182de77f013d3f3f829761adfb5f7df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-highlight
 * [new ref]         10d9328b9182de77f013d3f3f829761adfb5f7df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10d9328 R-maint-sig mass rebuild