$ git clone -n https://src.fedoraproject.org/rpms/R-bit.git /var/lib/mock/f39-build-1536009-36254/root/chroot_tmpdir/scmroot/R-bit
Cloning into '/var/lib/mock/f39-build-1536009-36254/root/chroot_tmpdir/scmroot/R-bit'...
$ git fetch origin e93fb6db2062fef9efb4f0bcdf9350d857db5cf7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-bit
 * [new ref]         e93fb6db2062fef9efb4f0bcdf9350d857db5cf7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e93fb6d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild