$ git clone -n https://src.fedoraproject.org/rpms/R-tesseract.git /var/lib/mock/f40-build-789228-135686/root/chroot_tmpdir/scmroot/R-tesseract
Cloning into '/var/lib/mock/f40-build-789228-135686/root/chroot_tmpdir/scmroot/R-tesseract'...
$ git fetch origin e4d0149913c7cdb75b3fb088781d269354f94c82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tesseract
 * [new ref]         e4d0149913c7cdb75b3fb088781d269354f94c82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4d0149 Rebuild (tesseract)