$ git clone -n https://src.fedoraproject.org/rpms/rust-base64ct.git /var/lib/mock/f40-build-2182850-51244/root/chroot_tmpdir/scmroot/rust-base64ct
Cloning into '/var/lib/mock/f40-build-2182850-51244/root/chroot_tmpdir/scmroot/rust-base64ct'...
$ git fetch origin 5669a490671b46b9c3b2038a178184f1e165c4b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-base64ct
 * [new ref]         5669a490671b46b9c3b2038a178184f1e165c4b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5669a49 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild