$ git clone -n https://src.fedoraproject.org/rpms/R-tesseract.git /var/lib/mock/f38-build-724159-99404/root/chroot_tmpdir/scmroot/R-tesseract
Cloning into '/var/lib/mock/f38-build-724159-99404/root/chroot_tmpdir/scmroot/R-tesseract'...
$ git fetch origin 8c6a401ce9e7b9ee39ddcf50d14303824f2f6098:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tesseract
 * [new ref]         8c6a401ce9e7b9ee39ddcf50d14303824f2f6098 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c6a401 R-maint-sig mass rebuild