Use checksum to rsync results

If dependencies are touched, the Makefile will detect that tools like deepcopy-gen need to be rebuilt. It will rebuild them, but Go decides the dependencies are not actually updated (maybe it was a test file - known limitation of the current Makefile) and does not touch the resulting binary. Then the Makefile touches the result explicitly to mark thatthe dep change has been handled. Then rsync blows away that change with the older file, and helpfully preserves the timestamp. Now rsync ignores it if the checksum is the same. Result = faster build.

Use checksum to rsync results
7aa91bbf · Tim Hockin · ffeb01fd · 7aa91bbf
Commit 7aa91bbf authored Oct 26, 2016 by Tim Hockin
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golang.sh hack/lib/golang.sh +1 -1

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--- a/hack/lib/golang.sh
+++ b/hack/lib/golang.sh
@@ -383,7 +383,7 @@ kube::golang::place_bins() {
    if [[ -d "${full_binpath_src}" ]]; then
      mkdir -p "${KUBE_OUTPUT_BINPATH}/${platform}"
      find "${full_binpath_src}" -maxdepth 1 -type f -exec \
-        rsync -pt {} "${KUBE_OUTPUT_BINPATH}/${platform}" \;
+        rsync -ptc {} "${KUBE_OUTPUT_BINPATH}/${platform}" \;
    fi
  done
 }