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"""Helpers for Docker image generation."""
def _docker_image_impl(ctx):
importer = ctx.actions.declare_file(ctx.label.name)
importer_content = [
"#!/bin/bash",
"set -euo pipefail",
"exec docker import " + " ".join([
"-c '%s'" % attr
for attr in ctx.attr.statements
]) + " " + " ".join([
"'%s'" % f.path
for f in ctx.files.data
]) + " $1",
"",
]
ctx.actions.write(importer, "\n".join(importer_content), is_executable = True)
return [DefaultInfo(
runfiles = ctx.runfiles(ctx.files.data),
executable = importer,
)]
docker_image = rule(
implementation = _docker_image_impl,
doc = "Tool to load a Docker image; takes a single parameter (image name).",
attrs = {
"statements": attr.string_list(doc = "Extra Dockerfile directives."),
"data": attr.label_list(doc = "All image data."),
},
executable = True,
)
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