mirror of
https://github.com/bazel-contrib/bazel-lib
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106 lines
3.7 KiB
Python
106 lines
3.7 KiB
Python
"Rules for working with transitions."
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load("@bazel_skylib//lib:paths.bzl", "paths")
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def _transition_platform_impl(_, attr):
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return {"//command_line_option:platforms": str(attr.target_platform)}
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# Transition from any input configuration to one that includes the
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# --platforms command-line flag.
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_transition_platform = transition(
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implementation = _transition_platform_impl,
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inputs = [],
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outputs = ["//command_line_option:platforms"],
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)
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def _platform_transition_filegroup_impl(ctx):
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files = []
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runfiles = ctx.runfiles()
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for src in ctx.attr.srcs:
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files.append(src[DefaultInfo].files)
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runfiles = runfiles.merge_all([src[DefaultInfo].default_runfiles for src in ctx.attr.srcs])
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return [DefaultInfo(
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files = depset(transitive = files),
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runfiles = runfiles,
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)]
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platform_transition_filegroup = rule(
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_platform_transition_filegroup_impl,
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attrs = {
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# Required to Opt-in to the transitions feature.
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"_allowlist_function_transition": attr.label(
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default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
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),
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"target_platform": attr.label(
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doc = "The target platform to transition the srcs.",
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mandatory = True,
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),
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"srcs": attr.label_list(
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allow_empty = False,
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cfg = _transition_platform,
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doc = "The input to be transitioned to the target platform.",
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),
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},
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doc = "Transitions the srcs to use the provided platform. The filegroup will contain artifacts for the target platform.",
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)
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def _platform_transition_binary_impl(ctx):
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# We need to forward the DefaultInfo provider from the underlying rule.
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# Unfortunately, we can't do this directly, because Bazel requires that the executable to run
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# is actually generated by this rule, so we need to symlink to it, and generate a synthetic
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# forwarding DefaultInfo.
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result = []
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binary = ctx.attr.binary[0]
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default_info = binary[DefaultInfo]
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files = default_info.files
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new_executable = None
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original_executable = default_info.files_to_run.executable
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runfiles = default_info.default_runfiles
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if not original_executable:
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fail("Cannot transition a 'binary' that is not executable")
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new_executable_name = ctx.attr.basename if ctx.attr.basename else original_executable.basename
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# In order for the symlink to have the same basename as the original
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# executable (important in the case of proto plugins), put it in a
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# subdirectory named after the label to prevent collisions.
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new_executable = ctx.actions.declare_file(paths.join(ctx.label.name, new_executable_name))
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ctx.actions.symlink(
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output = new_executable,
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target_file = original_executable,
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is_executable = True,
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)
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files = depset(direct = [new_executable], transitive = [files])
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runfiles = runfiles.merge(ctx.runfiles([new_executable]))
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result.append(
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DefaultInfo(
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files = files,
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runfiles = runfiles,
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executable = new_executable,
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),
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)
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return result
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platform_transition_binary = rule(
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implementation = _platform_transition_binary_impl,
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attrs = {
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"basename": attr.string(),
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"binary": attr.label(allow_files = True, cfg = _transition_platform),
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"target_platform": attr.label(
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doc = "The target platform to transition the binary.",
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mandatory = True,
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),
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"_allowlist_function_transition": attr.label(
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default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
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),
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},
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executable = True,
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doc = "Transitions the binary to use the provided platform.",
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)
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