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https://github.com/bazel-contrib/bazel-lib
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74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
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"""Rule for generating integrity files
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Default output is a .sha256 file but .sha1 and .md5 files are also available
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via output groups.
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Based on https://github.com/bazelbuild/examples/blob/main/rules/implicit_output/hash.bzl
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"""
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def _impl(ctx):
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# Create actions to generate the three output files.
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# Actions are run only when the corresponding file is requested.
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md5out = ctx.actions.declare_file("{}.md5".format(ctx.file.src.basename))
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ctx.actions.run_shell(
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outputs = [md5out],
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inputs = [ctx.file.src],
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command = "ROOT=$PWD && cd {} && md5sum {} > $ROOT/{}".format(ctx.file.src.dirname, ctx.file.src.basename, md5out.path),
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)
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sha1out = ctx.actions.declare_file("{}.sha1".format(ctx.file.src.basename))
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ctx.actions.run_shell(
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outputs = [sha1out],
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inputs = [ctx.file.src],
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command = "ROOT=$PWD && cd {} && sha1sum {} > $ROOT/{}".format(ctx.file.src.dirname, ctx.file.src.basename, sha1out.path),
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)
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sha256out = ctx.actions.declare_file("{}.sha256".format(ctx.file.src.basename))
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ctx.actions.run_shell(
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outputs = [sha256out],
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inputs = [ctx.file.src],
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command = "ROOT=$PWD && cd {dirname} && $ROOT/{sha256sum} {basename} > $ROOT/{path}".format(
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dirname = ctx.file.src.dirname,
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sha256sum = ctx.executable._sha256sum.path,
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basename = ctx.file.src.basename,
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path = sha256out.path,
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),
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tools = [ctx.executable._sha256sum],
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)
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# By default (if you run `bazel build` on this target, or if you use it as a
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# source of another target), only the sha256 is computed.
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return [
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DefaultInfo(
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files = depset([sha256out]),
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),
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OutputGroupInfo(
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md5 = depset([md5out]),
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sha1 = depset([sha1out]),
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sha256 = depset([sha256out]),
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),
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]
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_hashes = rule(
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implementation = _impl,
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attrs = {
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"src": attr.label(
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allow_single_file = True,
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mandatory = True,
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),
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"_sha256sum": attr.label(
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executable = True,
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cfg = "exec",
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default = "//tools/sha256sum",
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),
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},
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)
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def hashes(name, src, **kwargs):
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_hashes(
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name = name,
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src = src,
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**kwargs
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)
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