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Use empty string as fallback value for undefined environment variables #2261

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Use empty string as fallback value for undefined environment variables #2261

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2 changes: 1 addition & 1 deletion contrib/dockerfile_build.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ def _impl(repository_ctx):
build_args.extend(["--build-arg", "%s=%s" % (pair[0], pair[1])])
if repository_ctx.attr.vars:
for env_var in repository_ctx.attr.vars:
build_args.extend(["--build-arg", "%s=%s" % (env_var, repository_ctx.os.environ.get(env_var))])
build_args.extend(["--build-arg", "%s=%s" % (env_var, repository_ctx.os.environ.get(env_var, ""))])

# The docker bulid command needs to run using the supplied Dockerfile
# because it may refer to relative paths in its ADD, COPY and WORKDIR
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