$ git clone -n https://src.fedoraproject.org/rpms/rust-serde-value.git /var/lib/mock/f45-build-44836-818/root/chroot_tmpdir/scmroot/rust-serde-value
Cloning into '/var/lib/mock/f45-build-44836-818/root/chroot_tmpdir/scmroot/rust-serde-value'...
$ git fetch origin 83d1ca4628590a995817fd6083199b70c469bc59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde-value
 * [new ref]         83d1ca4628590a995817fd6083199b70c469bc59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83d1ca4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild