$ git clone -n https://src.fedoraproject.org/rpms/R-styler.git /var/lib/mock/f42-build-side-1-3502100-45977/root/chroot_tmpdir/scmroot/R-styler
Cloning into '/var/lib/mock/f42-build-side-1-3502100-45977/root/chroot_tmpdir/scmroot/R-styler'...
$ git fetch origin 5eccf2f5e6341114e8fb7f36624e90959a847af9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-styler
 * [new ref]         5eccf2f5e6341114e8fb7f36624e90959a847af9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5eccf2f R-maint-sig mass rebuild