os/linux/ld: add support for using system ld.so
This commit is contained in:
Michael Cho
parent
6e9da0ba4c
commit
896edb4451
@ -1,26 +1,13 @@
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# typed: strict
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# frozen_string_literal: true
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require "os/linux/ld"
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require "utils/output"
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module OS
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module Linux
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module Install
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module ClassMethods
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# This is a list of known paths to the host dynamic linker on Linux if
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# the host glibc is new enough. The symlink_ld_so method will fail if
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# the host linker cannot be found in this list.
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DYNAMIC_LINKERS = %w[
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/lib64/ld-linux-x86-64.so.2
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/lib64/ld64.so.2
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/lib/ld-linux.so.3
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/lib/ld-linux.so.2
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/lib/ld-linux-aarch64.so.1
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/lib/ld-linux-armhf.so.3
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/system/bin/linker64
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/system/bin/linker
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].freeze
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# We link GCC runtime libraries that are not specifically used for Fortran,
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# which are linked by the GCC formula. We only use the versioned shared libraries
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# as the other shared and static libraries are only used at build time where
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@ -67,7 +54,7 @@ module OS
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ld_so = HOMEBREW_PREFIX/"opt/glibc/bin/ld.so"
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unless ld_so.readable?
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ld_so = DYNAMIC_LINKERS.find { |s| File.executable? s }
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ld_so = OS::Linux::Ld.system_ld_so
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if ld_so.blank?
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::Kernel.raise "Unable to locate the system's dynamic linker" unless brew_ld_so.readable?
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@ -5,37 +5,69 @@ module OS
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module Linux
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# Helper functions for querying `ld` information.
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module Ld
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sig { returns(String) }
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def self.brewed_ld_so_diagnostics
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@brewed_ld_so_diagnostics ||= T.let({}, T.nilable(T::Hash[Pathname, String]))
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# This is a list of known paths to the host dynamic linker on Linux if
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# the host glibc is new enough. Brew will fail to create a symlink for
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# ld.so if the host linker cannot be found in this list.
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DYNAMIC_LINKERS = %w[
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/lib64/ld-linux-x86-64.so.2
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/lib64/ld64.so.2
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/lib/ld-linux.so.3
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/lib/ld-linux.so.2
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/lib/ld-linux-aarch64.so.1
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/lib/ld-linux-armhf.so.3
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/system/bin/linker64
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/system/bin/linker
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].freeze
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brewed_ld_so = HOMEBREW_PREFIX/"lib/ld.so"
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return "" unless brewed_ld_so.exist?
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# The path to the system's dynamic linker or `nil` if not found
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sig { returns(T.nilable(Pathname)) }
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def self.system_ld_so
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@system_ld_so ||= T.let(nil, T.nilable(Pathname))
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@system_ld_so ||= begin
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linker = DYNAMIC_LINKERS.find { |s| File.executable? s }
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Pathname(linker) if linker
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end
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end
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brewed_ld_so_target = brewed_ld_so.readlink
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@brewed_ld_so_diagnostics[brewed_ld_so_target] ||= begin
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ld_so_output = Utils.popen_read(brewed_ld_so, "--list-diagnostics")
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sig { params(brewed: T::Boolean).returns(String) }
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def self.ld_so_diagnostics(brewed: true)
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@ld_so_diagnostics ||= T.let({}, T.nilable(T::Hash[Pathname, String]))
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ld_so_target = if brewed
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ld_so = HOMEBREW_PREFIX/"lib/ld.so"
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return "" unless ld_so.exist?
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ld_so.readlink
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else
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ld_so = system_ld_so
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return "" unless ld_so&.exist?
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ld_so
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end
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@ld_so_diagnostics[ld_so_target] ||= begin
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ld_so_output = Utils.popen_read(ld_so, "--list-diagnostics")
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ld_so_output if $CHILD_STATUS.success?
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end
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@brewed_ld_so_diagnostics[brewed_ld_so_target].to_s
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@ld_so_diagnostics[ld_so_target].to_s
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end
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sig { returns(String) }
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def self.sysconfdir
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sig { params(brewed: T::Boolean).returns(String) }
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def self.sysconfdir(brewed: true)
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fallback_sysconfdir = "/etc"
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match = brewed_ld_so_diagnostics.match(/path.sysconfdir="(.+)"/)
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match = ld_so_diagnostics(brewed:).match(/path.sysconfdir="(.+)"/)
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return fallback_sysconfdir unless match
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match.captures.compact.first || fallback_sysconfdir
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end
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sig { returns(T::Array[String]) }
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def self.system_dirs
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sig { params(brewed: T::Boolean).returns(T::Array[String]) }
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def self.system_dirs(brewed: true)
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dirs = []
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brewed_ld_so_diagnostics.split("\n").each do |line|
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ld_so_diagnostics(brewed:).split("\n").each do |line|
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match = line.match(/path.system_dirs\[0x.*\]="(.*)"/)
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next unless match
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@ -45,9 +77,9 @@ module OS
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dirs
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end
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sig { params(conf_path: T.any(Pathname, String)).returns(T::Array[String]) }
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def self.library_paths(conf_path = Pathname(sysconfdir)/"ld.so.conf")
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conf_file = Pathname(conf_path)
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sig { params(conf_path: T.any(Pathname, String), brewed: T::Boolean).returns(T::Array[String]) }
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def self.library_paths(conf_path = "ld.so.conf", brewed: true)
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conf_file = Pathname(sysconfdir(brewed:))/conf_path
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return [] unless conf_file.exist?
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return [] unless conf_file.file?
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return [] unless conf_file.readable?
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@ -68,8 +100,7 @@ module OS
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line.sub!(/\s*#.*$/, "")
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if line.start_with?(/\s*include\s+/)
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include_path = Pathname(line.sub(/^\s*include\s+/, "")).expand_path
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wildcard = include_path.absolute? ? include_path : directory/include_path
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wildcard = Pathname(line.sub(/^\s*include\s+/, "")).expand_path(directory)
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Dir.glob(wildcard.to_s).each do |include_file|
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paths += library_paths(include_file)
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@ -4,6 +4,61 @@ require "os/linux/ld"
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require "tmpdir"
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RSpec.describe OS::Linux::Ld do
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let(:diagnostics) do
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<<~EOS
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path.prefix="/usr"
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path.sysconfdir="/usr/local/etc"
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path.system_dirs[0x0]="/lib64"
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path.system_dirs[0x1]="/var/lib"
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EOS
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end
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describe "::system_ld_so" do
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let(:ld_so) { "/lib/ld-linux.so.3" }
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before do
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allow(File).to receive(:executable?).and_return(false)
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described_class.instance_variable_set(:@system_ld_so, nil)
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end
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it "returns the path to a known dynamic linker" do
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allow(File).to receive(:executable?).with(ld_so).and_return(true)
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expect(described_class.system_ld_so).to eq(Pathname(ld_so))
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end
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it "returns nil when there is no known dynamic linker" do
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expect(described_class.system_ld_so).to be_nil
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end
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end
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describe "::sysconfdir" do
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it "returns path.sysconfdir" do
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allow(described_class).to receive(:ld_so_diagnostics).and_return(diagnostics)
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expect(described_class.sysconfdir).to eq("/usr/local/etc")
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expect(described_class.sysconfdir(brewed: false)).to eq("/usr/local/etc")
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end
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it "returns fallback on blank diagnostics" do
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allow(described_class).to receive(:ld_so_diagnostics).and_return("")
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expect(described_class.sysconfdir).to eq("/etc")
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expect(described_class.sysconfdir(brewed: false)).to eq("/etc")
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end
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end
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describe "::system_dirs" do
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it "returns all path.system_dirs" do
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allow(described_class).to receive(:ld_so_diagnostics).and_return(diagnostics)
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expect(described_class.system_dirs).to eq(["/lib64", "/var/lib"])
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expect(described_class.system_dirs(brewed: false)).to eq(["/lib64", "/var/lib"])
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end
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it "returns an empty array on blank diagnostics" do
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allow(described_class).to receive(:ld_so_diagnostics).and_return("")
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expect(described_class.system_dirs).to eq([])
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expect(described_class.system_dirs(brewed: false)).to eq([])
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end
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end
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describe "::library_paths" do
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ld_etc = Pathname("")
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before do
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