Merge pull request #48708 from bmwiedemann/date

Automatic merge from submit-queue (batch tested with PRs 49222, 49333, 48708, 49337) Allow to override build date See https://reproducible-builds.org/ for why this is good and https://reproducible-builds.org/specs/source-date-epoch/ for the definition of this variable. Background: issue #48710 when trying to build the kubernetes package for the openSUSE Linux distribution ``` /usr/bin/hyperkube /usr/bin/kubeadm /usr/src/kubernetes/platforms/linux/amd64/e2e.test ``` had a date+time string embedded in them in the format 2018-08-15T19:08:34Z which meant that each build produced new binaries even when nothing actually changed. Those then had to be synced to mirrors, wasting their and our users' bandwidth.

Merge pull request #48708 from bmwiedemann/date
ab6f1f0d · Kubernetes Submit Queue · GitHub · e6a4b531 · cd0e7b9e · ab6f1f0d
Commit ab6f1f0d authored Jul 20, 2017 by Kubernetes Submit Queue Committed by GitHub Jul 20, 2017
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version.sh hack/lib/version.sh +3 -1

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--- a/hack/lib/version.sh
+++ b/hack/lib/version.sh
@@ -130,7 +130,9 @@ kube::version::ldflag() {
 kube::version::ldflags() {
  kube::version::get_version_vars

-  local -a ldflags=($(kube::version::ldflag "buildDate" "$(date -u +'%Y-%m-%dT%H:%M:%SZ')"))
+  local buildDate=
+  [[ -z ${SOURCE_DATE_EPOCH-} ]] || buildDate="--date=@${SOURCE_DATE_EPOCH}"
+  local -a ldflags=($(kube::version::ldflag "buildDate" "$(date ${buildDate} -u +'%Y-%m-%dT%H:%M:%SZ')"))
  if [[ -n ${KUBE_GIT_COMMIT-} ]]; then
    ldflags+=($(kube::version::ldflag "gitCommit" "${KUBE_GIT_COMMIT}"))
    ldflags+=($(kube::version::ldflag "gitTreeState" "${KUBE_GIT_TREE_STATE}"))