Stop shipping triplicate Linux shared libraries in native gems

ext/page_print/extconf.rb

@@ -12,13 +12,32 @@ def page_print_native_platform
   end
 end
 
+def restore_vendor_so_aliases(vendor_lib_dir)
+  manifest_path = File.join(vendor_lib_dir, 'so_aliases')
+  return unless File.file?(manifest_path)
+
+  File.foreach(manifest_path) do |line|
+    alias_name, target_name = line.strip.split("\t", 2)
+    next if alias_name.nil? || alias_name.empty? || target_name.nil? || target_name.empty?
+    next if alias_name.include?('/') || target_name.include?('/') || alias_name.start_with?('.') || target_name.start_with?('.')
+
+    alias_path = File.join(vendor_lib_dir, alias_name)
+    target_path = File.join(vendor_lib_dir, target_name)
+    next unless File.file?(target_path)
+    next if File.exist?(alias_path) || File.symlink?(alias_path)
+
+    File.symlink(target_name, alias_path)
+  end
+end
+
 project_root = File.expand_path('../..', __dir__)
 vendor_platform = ENV.fetch('PAGE_PRINT_VENDOR_PLATFORM', page_print_native_platform)
 vendor_dir = File.join(project_root, 'lib', 'page_print', 'vendor', vendor_platform)
 vendor_include_dir = File.join(vendor_dir, 'include')
 vendor_lib_dir = File.join(vendor_dir, 'lib')
 
 if File.directory?(vendor_include_dir) && File.directory?(vendor_lib_dir)
+  restore_vendor_so_aliases(vendor_lib_dir)
   dir_config('plutobook', vendor_include_dir, vendor_lib_dir)
 
   if vendor_platform.end_with?('-linux')

rakelib/package_linux.rake

@@ -45,7 +45,6 @@ namespace :package do
     FileUtils.mkdir_p(vendor_dir)
     FileUtils.cp_r(File.join(plutobook_install_dir, "include"), vendor_dir)
     FileUtils.cp_r(File.join(plutobook_install_dir, "lib"), vendor_dir)
-    materialize_vendor_symlinks(File.join(vendor_dir, "lib"))
 
     ENV["PAGE_PRINT_VENDOR_PLATFORM"] = PAGE_PRINT_LINUX_PLATFORM
     Rake::Task["clean"].invoke if Rake::Task.task_defined?("clean")
@@ -56,6 +55,7 @@ namespace :package do
     vendor_linux_shared_libraries(extension_path, vendor_lib_dir)
     patch_linux_rpaths(extension_path, vendor_lib_dir)
     verify_no_missing_linux_libraries(extension_path, vendor_lib_dir)
+    collapse_vendor_shared_library_aliases(vendor_lib_dir)
     FileUtils.rm_f(extension_path)
 
     Bundler.with_unbundled_env do
@@ -98,27 +98,47 @@ def vendor_linux_shared_libraries(extension_path, vendor_lib_dir)
   end
 end
 
-def materialize_vendor_symlinks(vendor_lib_dir)
+def collapse_vendor_shared_library_aliases(vendor_lib_dir)
+  aliases = {}
+
   Dir.glob(File.join(vendor_lib_dir, "*.so*")).each do |library_path|
     next unless File.symlink?(library_path)
 
-    real_path = File.realpath(library_path)
+    target_name = File.basename(File.realpath(library_path))
+    alias_name = File.basename(library_path)
+    next if alias_name == target_name
+
+    aliases[alias_name] = target_name
     FileUtils.rm(library_path)
-    File.binwrite(library_path, File.binread(real_path))
-    FileUtils.chmod(0o755, library_path)
+  end
+
+  manifest_path = File.join(vendor_lib_dir, "so_aliases")
+  if aliases.empty?
+    FileUtils.rm_f(manifest_path)
+  else
+    File.write(manifest_path, aliases.sort.map { |alias_name, target_name| "#{alias_name}\t#{target_name}\n" }.join)
   end
 end
 
 def patch_linux_rpaths(extension_path, vendor_lib_dir)
   sh "patchelf --set-rpath '$ORIGIN/vendor/#{package_linux_platform}/lib' #{extension_path.shellescape}"
 
   Dir.glob(File.join(vendor_lib_dir, "*.so*")).each do |library_path|
+    next if File.symlink?(library_path)
+
     sh "patchelf --set-rpath '$ORIGIN' #{library_path.shellescape}"
   end
 end
 
 def verify_no_missing_linux_libraries(extension_path, vendor_lib_dir)
-  [ extension_path, *Dir.glob(File.join(vendor_lib_dir, "*.so*")) ].each do |binary|
+  binaries = [extension_path]
+  Dir.glob(File.join(vendor_lib_dir, "*.so*")).each do |library_path|
+    next if File.symlink?(library_path)
+
+    binaries << library_path
+  end
+
+  binaries.each do |binary|
     output = `ldd #{binary.shellescape}`
     abort "Missing shared library for #{binary}:\n#{output}" if output.include?("not found")
   end