$ git clone -n https://src.fedoraproject.org/rpms/rust-rmp-serde.git /var/lib/mock/f38-build-side-42-init-devel-1395083-31050/root/chroot_tmpdir/scmroot/rust-rmp-serde
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1395083-31050/root/chroot_tmpdir/scmroot/rust-rmp-serde'...
$ git fetch origin 2002ba7d68a79eefd4922088fc3a2db29e07b8e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rmp-serde
 * [new ref]         2002ba7d68a79eefd4922088fc3a2db29e07b8e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2002ba7 Update to version 1.1.2; Fixes RHBZ#2224604