$ git clone -n https://src.fedoraproject.org/rpms/rust-serde.git /var/lib/mock/f41-build-side-1-3134908-39764/root/chroot_tmpdir/scmroot/rust-serde
Cloning into '/var/lib/mock/f41-build-side-1-3134908-39764/root/chroot_tmpdir/scmroot/rust-serde'...
$ git fetch origin 1410975e44ef2d7e5a5187854f86cf8ea879b4f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde
 * [new ref]         1410975e44ef2d7e5a5187854f86cf8ea879b4f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1410975 Update to version 1.0.215; Fixes RHBZ#2325334