$ git clone -n https://src.fedoraproject.org/rpms/rubygem-sys-uname.git /var/lib/mock/f38-build-side-42-init-devel-647863-26439/root/chroot_tmpdir/scmroot/rubygem-sys-uname
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-647863-26439/root/chroot_tmpdir/scmroot/rubygem-sys-uname'...
$ git fetch origin 88f586371e376507a93d05591da305b9fe119b5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-sys-uname
 * [new ref]         88f586371e376507a93d05591da305b9fe119b5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88f5863 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild