cloud build: initialize support for running commands in Dockerfile

If the Dockerfile needs to run some command, that step fails unless QEMU is set up properly first: failed to solve: rpc error: code = Unknown desc = failed to load LLB: runtime execution on platform linux/ppc64le not supported

cloud build: initialize support for running commands in Dockerfile
db0c2a7d · Patrick Ohly · be902f40 · db0c2a7d
Commit db0c2a7d authored Jun 04, 2020 by Patrick Ohly
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prow.sh prow.sh +6 -0

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--- a/prow.sh
+++ b/prow.sh
@@ -1198,6 +1198,12 @@ gcr_cloud_build () {
    # Required for "docker buildx build --push".
    gcloud auth configure-docker

+    if find . -name Dockerfile | grep -v ^./vendor | xargs --no-run-if-empty cat | grep -q ^RUN; then
+        # Needed for "RUN" steps on non-linux/amd64 platforms.
+        # See https://github.com/multiarch/qemu-user-static#getting-started
+        (set -x; docker run --rm --privileged multiarch/qemu-user-static --reset -p yes)
+    fi
+
    # Extract tag-n-hash value from GIT_TAG (form vYYYYMMDD-tag-n-hash) for REV value.
    REV=v$(echo "$GIT_TAG" | cut -f3- -d 'v')