Модуль: OS::Linux::Keg Закрытый

31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73

# File 'extend/os/linux/keg_relocate.rb', line 31

def change_rpath!(file, old_prefix, new_prefix, skip_protodesc_cold: false)
  return false if !file.elf? || !file.dynamic_elf?

  # Skip relocation of files with `protodesc_cold` sections because patchelf.rb seems to break them,
  # but only when bottling (as we don't want to break existing bottles that require relocation).
  # https://github.com/Homebrew/homebrew-core/pull/232490#issuecomment-3161362452
  return false if skip_protodesc_cold && file.section_names.include?("protodesc_cold")

  updated = {}
  old_rpath = file.rpath
  new_rpath = if old_rpath
    rpath = old_rpath.split(":")
                     .map { |x| x.sub(old_prefix, new_prefix) }
                     .select { |x| x.start_with?(new_prefix, "$ORIGIN") }

    lib_path = "#{new_prefix}/lib"
    rpath << lib_path unless rpath.include? lib_path

    # Add GCC's lib directory (as of GCC 12+) to RPATH when there is existing versioned linkage.
    # This prevents broken linkage when pouring bottles built with an old GCC formula.
    unless name.match?(Version.formula_optionally_versioned_regex(:gcc))
      rpath.map! { |rp| rp.sub(%r{lib/gcc/\d+$}, "lib/gcc/current") }
    end

    rpath.join(":")
  end
  updated[:rpath] = new_rpath if old_rpath != new_rpath

  old_interpreter = file.interpreter
  new_interpreter = if old_interpreter.nil?
    nil
  elsif File.readable? "#{new_prefix}/lib/ld.so"
    "#{new_prefix}/lib/ld.so"
  else
    old_interpreter.sub old_prefix, new_prefix
  end
  updated[:interpreter] = new_interpreter if old_interpreter != new_interpreter
  return false if updated.empty?

  file.patch!(interpreter: updated[:interpreter], rpath: updated[:rpath])
  require_relocation!
  true
end

76
77
78
79
80
81
82
83
84
85
86
87
88

# File 'extend/os/linux/keg_relocate.rb', line 76

def detect_cxx_stdlibs(options = {})
  skip_executables = options.fetch(:skip_executables, false)
  results = Set.new
  elf_files.each do |file|
    next unless file.dynamic_elf?
    next if file.binary_executable? && skip_executables

    dylibs = file.dynamically_linked_libraries
    results << :libcxx if dylibs.any? { |s| s.include? "libc++.so" }
    results << :libstdcxx if dylibs.any? { |s| s.include? "libstdc++.so" }
  end
  results.to_a
end

91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108

# File 'extend/os/linux/keg_relocate.rb', line 91

def elf_files
  hardlinks = Set.new
  elf_files = []
  path.find do |pn|
    next if pn.symlink? || pn.directory?

    pn = ELFPathname.wrap(pn)
    next if !pn.dylib? && !pn.binary_executable?

    # If we've already processed a file, ignore its hardlinks (which have the
    # same dev ID and inode). This prevents relocations from being performed
    # on a binary more than once.
    next unless hardlinks.add? [pn.stat.dev, pn.stat.ino]

    elf_files << pn
  end
  elf_files
end

14
15
16
17
18
19
20
21
22
23
24
25

# File 'extend/os/linux/keg_relocate.rb', line 14

def relocate_dynamic_linkage(relocation, skip_protodesc_cold: false)
  # Patching the dynamic linker of glibc breaks it.
  return if name.match? Version.formula_optionally_versioned_regex(:glibc)

  old_prefix, new_prefix = relocation.replacement_pair_for(:prefix)

  elf_files.each do |file|
    file.ensure_writable do
      change_rpath!(file, old_prefix, new_prefix, skip_protodesc_cold:)
    end
  end
end