aufs-genpatch.rb

#!/usr/bin/env ruby

if ARGV[0].to_s == ""
then linux_base = "4.5"
else linux_base = ARGV[0]
end

if ARGV[1].to_s == ""
then out_dir = File.dirname(File.realpath($0))
else out_dir = ARGV[1]
end

require "tempfile"
require "fileutils"

GH_user           = "sfjro"
GH_repo           = "aufs4-standalone"
GH_branch         = "aufs#{linux_base}"
GH_tarball        = "https://github.com/#{GH_user}/#{GH_repo}/archive/#{GH_branch}.tar.gz"
GH_tarball_topdir = "#{GH_repo}-#{GH_branch}"

aufs_reldate_src = "include/uapi/linux/aufs_type.h"
aufs_reldate_re  = /^[[:space:]]*#define[[:space:]]+AUFS_VERSION[[:space:]]+"(#{linux_base}-([^"]+))"[[:space:]]*$/
aufs_reldate_raw = ""
aufs_reldate     = ""

Dir.mktmpdir { |tmpdir_tarball|
    Tempfile.create("aufs") { |tmpfile_tarball|
        `wget -q -O #{tmpfile_tarball.path} #{GH_tarball}`
        `tar -x -f #{tmpfile_tarball.path} -C #{tmpdir_tarball}`
    }

    tarball_dir = File.join(tmpdir_tarball, GH_tarball_topdir)

    File.open(File.join(tarball_dir, aufs_reldate_src)) { |f|
        f.grep(aufs_reldate_re) { |line|
            aufs_reldate_raw = aufs_reldate_re.match(line)[1]
            aufs_reldate     = aufs_reldate_re.match(line)[2]
        }
    }

    break if aufs_reldate == ""

    Dir.mktmpdir { |tmpdir_gitrepo|
        Dir.chdir(tmpdir_gitrepo)
        `git init`
        `git commit --allow-empty -m "0"`

        tree_mirror = [ "Documentation/", "fs/", "include/uapi/linux/aufs_type.h" ]

        Dir.chdir(tarball_dir)
        `tar -cf - #{tree_mirror.join(" ")} | tar -xf - -C #{tmpdir_gitrepo}`

        Dir.chdir(tmpdir_gitrepo)
        `git add .`

        common_patch = File.join(tarball_dir, "aufs4-common.patch")

        File.open(common_patch, 'w') { |f|
            f.puts("#{GH_branch} common files patch")
            f.puts()
        }
        `git diff HEAD >> #{common_patch}`

        Dir.chdir(tarball_dir)
    }

    file_renames = {
        "aufs4-common.patch"     => "0-common.patch",
        "aufs4-kbuild.patch"     => "1-kbuild.patch",
        "aufs4-base.patch"       => "2-base.patch",
        "aufs4-mmap.patch"       => "3-mmap.patch",
        "aufs4-standalone.patch" => "4-standalone.patch",
        "aufs4-loopback.patch"   => "5-loopback.patch",
        "vfs-ino.patch"          => "6-vfs-ino.patch",
        "tmpfs-idr.patch"        => "7-tmpfs-idr.patch",
    }

    file_renames.each_key{ |old_name|
        new_name = "#{linux_base}-#{aufs_reldate}-" + file_renames[old_name]
        new_name = File.join(out_dir, new_name)

        FileUtils.mv(old_name, new_name)
    }
}