mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-12 01:14:28 -05:00
5009cbabac
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 """
|
|
|
|
def _patchelf_impl(ctx):
|
|
output = ctx.outputs.out
|
|
ctx.actions.run_shell(
|
|
inputs = [ctx.file.src, ctx.file.rpath, ctx.file.interpreter],
|
|
tools = [ctx.executable._patchelf_binary],
|
|
outputs = [output],
|
|
arguments = [
|
|
ctx.executable._patchelf_binary.path,
|
|
ctx.file.rpath.path,
|
|
ctx.file.interpreter.path,
|
|
output.path,
|
|
ctx.file.src.path,
|
|
],
|
|
command = "\"$1\" --set-rpath \"$(cat \"$2\")\" --set-interpreter \"$(cat \"$3\")\" --output \"$4\" \"$5\"",
|
|
progress_message = "Patching ELF binary " + ctx.file.src.basename,
|
|
)
|
|
return DefaultInfo(
|
|
files = depset([output]),
|
|
executable = output,
|
|
)
|
|
|
|
patchelf = rule(
|
|
implementation = _patchelf_impl,
|
|
attrs = {
|
|
"out": attr.output(mandatory = True),
|
|
"rpath": attr.label(mandatory = True, allow_single_file = True),
|
|
"interpreter": attr.label(mandatory = True, allow_single_file = True),
|
|
"src": attr.label(mandatory = True, allow_single_file = True),
|
|
"_patchelf_binary": attr.label(
|
|
default = Label("@patchelf//:bin/patchelf"),
|
|
allow_single_file = True,
|
|
executable = True,
|
|
cfg = "exec",
|
|
),
|
|
},
|
|
doc = """Uses patchelf to set the rpath and interpreter of an ELF binary.
|
|
|
|
This is a post processing step for binaries that are built by Bazel
|
|
that link shared libraries from Nix.
|
|
Native nix binaries always use absolute paths to a specific linker and
|
|
embed the rpath for each linked library as an absolute nix store path.
|
|
Bazel embeds rpaths using $ORIGIN and uses paths relative to
|
|
the binaries output location. Without patchelf, the binary would only
|
|
work if we also ship all runfiles with the binary and preserve the relative
|
|
directory structure.
|
|
See https://github.com/tweag/rules_nixpkgs/issues/449 for more details.
|
|
""",
|
|
executable = True,
|
|
)
|