$ git clone -n https://src.fedoraproject.org/rpms/rust-serde.git /var/lib/mock/f38-build-side-42-init-devel-1020452-29633/root/chroot_tmpdir/scmroot/rust-serde
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1020452-29633/root/chroot_tmpdir/scmroot/rust-serde'...
$ git fetch origin f659f5f0bb3b1f34a740fa1c293decb942b0e492:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde
 * [new ref]         f659f5f0bb3b1f34a740fa1c293decb942b0e492 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f659f5f Update to version 1.0.177; Fixes RHBZ#2224131