$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ffi.git /var/lib/mock/f38-build-side-42-init-devel-573926-25952/root/chroot_tmpdir/scmroot/rubygem-ffi
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-573926-25952/root/chroot_tmpdir/scmroot/rubygem-ffi'...
$ git fetch origin 54f2db42a737c5ddd29d8eaeb66797fade62bd87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ffi
 * [new ref]         54f2db42a737c5ddd29d8eaeb66797fade62bd87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54f2db4 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild