$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_derive.git /var/lib/mock/f45-build-44841-818/root/chroot_tmpdir/scmroot/rust-serde_derive
Cloning into '/var/lib/mock/f45-build-44841-818/root/chroot_tmpdir/scmroot/rust-serde_derive'...
$ git fetch origin be0cb151b7c0e4870e31b4b269864770f01d981d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_derive
 * [new ref]         be0cb151b7c0e4870e31b4b269864770f01d981d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be0cb15 Update to version 1.0.229; Fixes RHBZ#2502142