mirror of
https://github.com/edgelesssys/constellation.git
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e174c4dfe1
This rule allows overwriting a binaries' rpath. This is required to use binaries built by Bazel that link against cc_library targets from nix (like `/nix/store/<hash>/lib/*.so`).
52 lines
2.0 KiB
Python
52 lines
2.0 KiB
Python
""" Bazel rule for postprocessing elf files with patchelf """
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def _patchelf_impl(ctx):
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output = ctx.outputs.out
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ctx.actions.run_shell(
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inputs = [ctx.file.src, ctx.file.rpath, ctx.file.interpreter],
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tools = [ctx.executable._patchelf_binary],
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outputs = [output],
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arguments = [
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ctx.executable._patchelf_binary.path,
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ctx.file.rpath.path,
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ctx.file.interpreter.path,
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output.path,
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ctx.file.src.path,
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],
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command = "\"$1\" --set-rpath \"$(cat \"$2\")\" --set-interpreter \"$(cat \"$3\")\" --output \"$4\" \"$5\"",
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progress_message = "Patching ELF binary " + ctx.file.src.basename,
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)
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return DefaultInfo(
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files = depset([output]),
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executable = output,
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)
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patchelf = rule(
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implementation = _patchelf_impl,
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attrs = {
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"interpreter": attr.label(mandatory = True, allow_single_file = True),
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"out": attr.output(mandatory = True),
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"rpath": attr.label(mandatory = True, allow_single_file = True),
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"src": attr.label(mandatory = True, allow_single_file = True),
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"_patchelf_binary": attr.label(
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default = Label("@patchelf//:bin/patchelf"),
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allow_single_file = True,
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executable = True,
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cfg = "exec",
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),
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},
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doc = """Uses patchelf to set the rpath and interpreter of an ELF binary.
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This is a post processing step for binaries that are built by Bazel
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that link shared libraries from Nix.
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Native nix binaries always use absolute paths to a specific linker and
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embed the rpath for each linked library as an absolute nix store path.
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Bazel embeds rpaths using $ORIGIN and uses paths relative to
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the binaries output location. Without patchelf, the binary would only
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work if we also ship all runfiles with the binary and preserve the relative
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directory structure.
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See https://github.com/tweag/rules_nixpkgs/issues/449 for more details.
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""",
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executable = True,
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)
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