$ git clone -n https://src.fedoraproject.org/rpms/rust-rmp-serde.git /var/lib/mock/f45-build-44462-813/root/chroot_tmpdir/scmroot/rust-rmp-serde
Cloning into '/var/lib/mock/f45-build-44462-813/root/chroot_tmpdir/scmroot/rust-rmp-serde'...
$ git fetch origin 110b9ed3724e64aae39621ca36a2e875dd44b5d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rmp-serde
 * [new ref]         110b9ed3724e64aae39621ca36a2e875dd44b5d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 110b9ed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild