$ git clone -n https://src.fedoraproject.org/rpms/R-tikzDevice.git /var/lib/mock/f43-build-58897389-6569095/root/chroot_tmpdir/scmroot/R-tikzDevice
Cloning into '/var/lib/mock/f43-build-58897389-6569095/root/chroot_tmpdir/scmroot/R-tikzDevice'...
$ git fetch origin e1c3cf2080c7936abca5e24478706e6b75512f13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tikzDevice
 * [new ref]         e1c3cf2080c7936abca5e24478706e6b75512f13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1c3cf2 R-maint-sig mass rebuild