$ git clone -n https://src.fedoraproject.org/rpms/rust-uuid.git /var/lib/mock/f40-build-1476592-23795/root/chroot_tmpdir/scmroot/rust-uuid
Cloning into '/var/lib/mock/f40-build-1476592-23795/root/chroot_tmpdir/scmroot/rust-uuid'...
$ git fetch origin 3c3d50367256254b567f068f38facc30a39d438b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uuid
 * [new ref]         3c3d50367256254b567f068f38facc30a39d438b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c3d503 Update to 1.9.1 (close RHBZ#2294052)