$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-prefix-all.git /var/lib/mock/f45-build-44866-818/root/chroot_tmpdir/scmroot/rust-serde-prefix-all
Cloning into '/var/lib/mock/f45-build-44866-818/root/chroot_tmpdir/scmroot/rust-serde-prefix-all'...
$ git fetch origin 4bc34d4894a00b5414fdbae9f0af67bdfa4f4fc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-prefix-all
 * [new ref]         4bc34d4894a00b5414fdbae9f0af67bdfa4f4fc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4bc34d4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild