$ git clone -n https://src.fedoraproject.org/rpms/rust-fnv.git /var/lib/mock/f40-build-2036404-48026/root/chroot_tmpdir/scmroot/rust-fnv
Cloning into '/var/lib/mock/f40-build-2036404-48026/root/chroot_tmpdir/scmroot/rust-fnv'...
$ git fetch origin 64d0cabe3e6d45a350c70bf3a7bd96dd7fa643d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fnv
 * [new ref]         64d0cabe3e6d45a350c70bf3a7bd96dd7fa643d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64d0cab Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild