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make buildx: fix Makefile version being ignored

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The `BUILDX_COMMIT` variable was set as a Make variable,
which isn't exported, and thus not available in scripts,
unless referenced through `$(VAR)` (non-curly-brackets).
As a result `--build-arg BUILDX_COMMIT` did not set the
`BUILDX_COMMIT` build-arg, and the default from the Dockerfile
(`master`) was used instead.

This patch exports the default version that's set in the
Makefile, so that it can be used as a regular environment
variable. The script was also slighly modified to no longer
use the `Make` variable.

In addition, the `buildx` target now calls `buildx version`,
which is useful to confirm if the binary was successfully built
(and with the correct version).

Before:

    rm -f bundles/buildx && make buildx && ./bundles/buildx version
    # => => naming to docker.io/library/moby-buildx:v0.3.0
    github.com/docker/buildx v0.3.1 6db68d0

    # using a make variable:
    rm -f bundles/buildx && make BUILDX_COMMIT=v0.2.1 buildx && ./bundles/buildx version
    # => => naming to docker.io/library/moby-buildx:v0.2.1
    github.com/docker/buildx v0.3.1 6db68d0

    # using an environment variable:
    rm -f bundles/buildx && BUILDX_COMMIT=v0.2.2 make buildx && ./bundles/buildx version
    # => => naming to docker.io/library/moby-buildx:v0.2.2
    github.com/docker/buildx v0.3.1 6db68d0

After:

    # default
    rm -f bundles/buildx && make buildx
    # => => naming to docker.io/library/moby-buildx:v0.3.0
    github.com/docker/buildx v0.3.0 c967f1d

    # using a make variable:
    rm -f bundles/buildx && make BUILDX_COMMIT=v0.2.1 buildx
    # => => naming to docker.io/library/moby-buildx:v0.2.1
    github.com/docker/buildx v0.2.1 0eb2df5

    # using an environment variable:
    rm -f bundles/buildx && BUILDX_COMMIT=v0.2.2 make buildx
    # => => naming to docker.io/library/moby-buildx:v0.2.2
    github.com/docker/buildx v0.2.2 ab5fe3d

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2019-10-14 14:32:10 +02:00
parent ce28a91cca
commit 365b3aee2d
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1 changed files with 14 additions and 5 deletions
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Makefile
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@ -252,16 +252,25 @@ else
buildx:
endif
BUILDX_COMMIT ?= v0.3.0
export BUILDX_COMMIT
bundles/buildx: BUILDX_DOCKERFILE ?= Dockerfile.buildx
bundles/buildx: BUILDX_COMMIT ?= v0.3.0
bundles/buildx: bundles ## build buildx CLI tool
# This intetionally is not using the `--output` flag from the docker CLI which is a buildkit option
# The idea here being that if buildx is being used, it's because buildkit is not supported natively
docker build -f $(BUILDX_DOCKERFILE) -t "moby-buildx:$(BUILDX_COMMIT)" \
docker build -f $(BUILDX_DOCKERFILE) -t "moby-buildx:$${BUILDX_COMMIT:-latest}" \
--build-arg BUILDX_COMMIT \
--build-arg BUILDX_REPO \
--build-arg GOOS=$$(if [ -n "$(GOOS)" ]; then echo $(GOOS); else go env GOHOSTOS || uname | awk '{print tolower($$0)}' || true; fi) \
--build-arg GOARCH=$$(if [ -n "$(GOARCH)" ]; then echo $(GOARCH); else go env GOHOSTARCH || true; fi) \
. && \
id=$$(docker create moby-buildx:$(BUILDX_COMMIT)); \
if [ -n "$${id}" ]; then docker cp $${id}:/usr/bin/buildx $@ && touch $@; docker rm -f $${id}; fi
.
id=$$(docker create moby-buildx:$${BUILDX_COMMIT:-latest}); \
if [ -n "$${id}" ]; then \
docker cp $${id}:/usr/bin/buildx $@ \
&& touch $@; \
docker rm -f $${id}; \
fi
$@ version