Push without submodules

nosubs.rb

#!/usr/bin/env ruby

$dry_run = ENV['NOSUB_DRYRUN'] && %w(1 t true y yes).include?(ENV['NOSUB_DRYRUN'].downcase)
$debug = ENV['NOSUB_DEBUG'] && %w(1 t true y yes).include?(ENV['NOSUB_DEBUG'].downcase)

def usage
  puts <<-USAGE
usage: $0 [-n] [-d] <remote> <ref>"
  -d | --debug     : Show performed operations
  -n | --dry-run   : Don't actually perform the operations
USAGE
end

def die(msg, show_usage=false)
  warn msg
  (puts ; usage) if show_usage
  exit 1
end

def debug(msg)
  warn msg if $debug
end

def sys(*cmd)
  cmd = cmd.compact
  debug cmd.join(" ")
  system(*cmd) unless $dry_run
end

remote, ref, force = nil
while arg = ARGV.shift
  case arg
  when '-h', '--help'
    usage
    exit
  when '-d', '--debug'
    $debug = true
  when '-n', '--dry-run'
    $dry_run = true
  else
    if remote.nil?
      remote = arg
    elsif ref.nil?
      ref = arg
      if m = /^\+(.*)/.match(ref)
        force = '+'
        ref = m[1]
      end
    else
      die "Too many parameters", true
    end
  end
end
die "Missing remote", true unless remote
die "Missing ref", true unless ref

$debug ||= $dry_run

git_working_dir = `git rev-parse --show-toplevel`.chomp
git_dir = `git rev-parse --git-dir`.chomp

Dir.chdir(git_working_dir) {

  if ! `git status -s`.chomp.empty?
    die "The working directory is not clean! (do you know .git/info/exclude?)"
  end

  cur_ref = `git rev-parse --abbrev-ref HEAD`.chomp
  cur_sha1 = `git rev-parse HEAD`.chomp

  submodules = File.read('.gitmodules').lines.map { |line|
    if m = /^\s*path\s*=\s*(\S+)/.match(line)
      m[1]
    end
  }.compact

  quiet = $debug ? nil : '--quiet'

  sys 'git', 'submodule', quiet, 'update', '--init'
  sys 'git', 'checkout', quiet, cur_sha1

  begin
    submodules.each { |path|
      sys 'git', 'rm', '--cached', quiet, path
      sys 'rm', "#{path}/.git"
      sys 'git', 'add', path
    }
    sys 'git', 'commit', quiet, '--no-verify', '-m', "Flatten submodules"

    sys 'git', 'push', '--no-verify', remote, "#{force}HEAD:#{ref}"
  ensure
    sys 'git', 'checkout', quiet, cur_ref
    sys 'git', 'submodule', quiet, 'update', '--init'
  end

}