$ git clone -n https://src.fedoraproject.org/rpms/R-processx.git /var/lib/mock/f38-build-side-42-init-devel-612732-26287/root/chroot_tmpdir/scmroot/R-processx
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-612732-26287/root/chroot_tmpdir/scmroot/R-processx'...
$ git fetch origin c03b0d2f77e535a0dd00f464141a08b52ec2c47a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-processx
 * [new ref]         c03b0d2f77e535a0dd00f464141a08b52ec2c47a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c03b0d2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild