$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_cbor.git /var/lib/mock/f45-build-44859-818/root/chroot_tmpdir/scmroot/rust-serde_cbor
Cloning into '/var/lib/mock/f45-build-44859-818/root/chroot_tmpdir/scmroot/rust-serde_cbor'...
$ git fetch origin 51c8143dc04d024a9a631bf340d1c5e2068fda09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_cbor
 * [new ref]         51c8143dc04d024a9a631bf340d1c5e2068fda09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51c8143 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild