$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_repr.git /var/lib/mock/f39-build-2186487-51358/root/chroot_tmpdir/scmroot/rust-serde_repr
Cloning into '/var/lib/mock/f39-build-2186487-51358/root/chroot_tmpdir/scmroot/rust-serde_repr'...
$ git fetch origin 6bf98d7d7b4f42596af4b0a83dc6792b97c3d3b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_repr
 * [new ref]         6bf98d7d7b4f42596af4b0a83dc6792b97c3d3b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bf98d7 Update to version 0.1.18; Fixes RHBZ#2256429