crew: Replace binutils/ar with a new library (#6642)

* Create deb_utils.rb

* Update crew

* Update core.rb

* Update const.rb

* Update deb_utils.rb

* Wrap as a module

Co-authored-by: Ed Reel <edreel@gmail.com>

bin/crew

@@ -13,6 +13,7 @@ require_relative '../lib/const'
 require_relative '../lib/util'
 require_relative '../lib/convert_size'
 require_relative '../lib/downloader'
+require_relative '../lib/deb_utils'
 
 # Add lib to LOAD_PATH
 $LOAD_PATH.unshift "#{CREW_LIB_PATH}lib"
@@ -803,19 +804,9 @@ def unpack(meta)
       puts "Unpacking archive using 'tar', this may take a while..."
       system "tar x#{@verbose}f #{meta[:filename]} -C #{@extract_dir}", exception: true
     when /\.deb$/i
-      puts "Unpacking archive using 'ar', this may take a while..."
-
-      suffix = `ar -t #{meta[:filename]}`.scan(/data.(.*)/)[0][0]
-      case suffix
-      when 'tar.xz'
-        tar_opt = '--xz'
-      when 'tgz', 'tar.gz'
-        tar_opt = '--gzip'
-      when 'bzip2'
-        tar_opt = '--bzip2'
-      end
-
-      system "ar -p #{meta[:filename]} data.#{suffix} | tar x#{@verbose} #{tar_opt} -C #{@extract_dir}", exception: true
+      puts "Unpacking '.deb' archive, this may take a while..."
+      DebUtils::extract_deb(meta[:filename], /data\..*/)
+      system "tar x#{@verbose}f data.* -C #{@extract_dir}", exception: true
     when /\.AppImage$/i
       puts "Unpacking 'AppImage' archive, this may take a while..."
       FileUtils.chmod 0o755, meta[:filename], verbose: @fileutils_verbose

lib/const.rb

@@ -1,6 +1,6 @@
 # Defines common constants used in different parts of crew
 
-CREW_VERSION = '1.21.8'
+CREW_VERSION = '1.22.0'
 
 ARCH_ACTUAL = `uname -m`.chomp
 # This helps with virtualized builds on aarch64 machines

lib/deb_utils.rb

@@ -0,0 +1,49 @@
+module DebUtils
+  def self.extract_deb(file, target)
+    # extract_deb: unarchive .deb files
+    # Usage: extract_deb(<file>, <target (optional)>)
+    #   file: a .deb archive file
+    #   target: (optional) a specified file to extract from archive, should be passed in regex or string
+    #
+    # Example:
+    #   extract_deb('example.deb', 'test.txt') # extract `test.txt` from example.deb
+    #   extract_deb('example.deb', /data\..*/) # extract files from example.deb with filenames matching the /data\..*/ regex
+    #   extract_deb('example.deb', /*/)        # extract all files from example.deb
+    #
+    file_found = false
+    src_fileIO = File.open(file, 'rb')
+    # get first line of the given file, should be a signature string (`!<arch>\n`) if it is a valid deb file
+    signature = src_fileIO.gets
+
+    abort 'Malformed archive :/' unless signature == "!<arch>\n"
+
+    # process each file in archive
+    while (line = src_fileIO.gets) do
+      # read file meta
+      name, modtime, uid, gid, mode, size, end_char = \
+        line.scan(/(.{16})(.{12})(.{6})(.{6})(.{8})(.{10})(.{1})/).flatten.map(&:strip)
+
+      # check ending byte
+      abort "Malformed archive :/" unless end_char == '`'
+
+      # capture file in archive with given offset bytes (file size)
+      fileContent = src_fileIO.read(size.to_i)
+
+      # filter filename if a target file is specified
+      if target.is_a?(String) and name == target
+        # if target is passed as string, write matched file to filesyetem and exit function
+        # write to filesystem
+        File.open(name, 'wb') {|dst_fileIO| dst_fileIO.write(fileContent) }
+        # exit function
+        return true
+      elsif target.is_a?(Regexp) and name =~ target
+        # if target is passed as regex, write matched file to filesyetem and continue
+        # searching for another matched file until EOF
+        # write to filesystem
+        File.open(name, 'wb') {|dst_fileIO| dst_fileIO.write(fileContent) }
+        file_found = true
+      end
+    end
+    abort "Target #{target.inspect} not found in archive. :/".lightred unless file_found
+  end
+end

packages/core.rb

@@ -9,7 +9,6 @@ class Core < Package
 
   is_fake
 
-  depends_on 'binutils'
   depends_on 'brotli'
   depends_on 'bz2'
   depends_on 'c_ares'