$ git clone -n https://src.fedoraproject.org/rpms/R-knitr.git /var/lib/mock/f37-build-side-32-misc-devel-226905-13746/root/chroot_tmpdir/scmroot/R-knitr
Cloning into '/var/lib/mock/f37-build-side-32-misc-devel-226905-13746/root/chroot_tmpdir/scmroot/R-knitr'...
$ git reset --hard afccaa65f58c64b978d9828fe6f3dfd18c12dc2f
HEAD is now at afccaa6 rebuild for R 4.2.1, update to 1.39