$ git clone -n https://src.fedoraproject.org/rpms/rust-fat-macho.git /var/lib/mock/f40-build-2036314-48018/root/chroot_tmpdir/scmroot/rust-fat-macho
Cloning into '/var/lib/mock/f40-build-2036314-48018/root/chroot_tmpdir/scmroot/rust-fat-macho'...
$ git fetch origin cae6a6eeebbee75a66d3cb2d8410cdd0d0e03c62:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fat-macho
 * [new ref]         cae6a6eeebbee75a66d3cb2d8410cdd0d0e03c62 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cae6a6e Update to version 0.4.7; Fixes RHBZ#2214292