Class: Braid::Operations::Git

Inherits:
Proxy
  • Object
show all
Defined in:
lib/braid/operations.rb

Defined Under Namespace

Classes: BlobWithMode

Instance Method Summary collapse

Methods inherited from Proxy

command, #require_version, #require_version!, #version

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Braid::Operations::Proxy

Instance Method Details

#add_item_to_index(item, path, update_worktree) ⇒ Object

Add the item (as returned by get_tree_item) to the index at the given path. If update_worktree is true, then update the worktree, otherwise disregard the state of the worktree (most useful with a temporary index file).



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# File 'lib/braid/operations.rb', line 293

def add_item_to_index(item, path, update_worktree)
  if item.is_a?(BlobWithMode)
    # Our minimum git version is 1.6.0 and the new --cacheinfo syntax
    # wasn't added until 2.0.0.
    invoke(:update_index, '--add', '--cacheinfo', item.mode, item.hash, path)
    if update_worktree
      # XXX If this fails, we've already updated the index.
      invoke(:checkout_index, path)
    end
  else
    # Yes, if path == '', "git read-tree --prefix=/" works. :/
    invoke(:read_tree, "--prefix=#{path}/", update_worktree ? '-u' : '-i', item)
  end
end

#BlobWithMode ⇒ Object

Allow the class to be referenced as ‘git.BlobWithMode`.



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# File 'lib/braid/operations.rb', line 264

def BlobWithMode
  Git::BlobWithMode
end

#branch ⇒ Object 



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# File 'lib/braid/operations.rb', line 383

def branch
  status, out, err = exec!("git branch | grep '*'")
  out[2..-1]
end

#checkout(treeish) ⇒ Object 



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# File 'lib/braid/operations.rb', line 194

def checkout(treeish)
  invoke(:checkout, treeish)
  true
end

#clone(*args) ⇒ Object 



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# File 'lib/braid/operations.rb', line 388

def clone(*args)
  # overrides builtin
  invoke(:clone, *args)
end

#commit(message, *args) ⇒ Object 



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# File 'lib/braid/operations.rb', line 167

def commit(message, *args)
  cmd = 'git commit --no-verify'
  if message # allow nil
    message_file = Tempfile.new('braid_commit')
    message_file.print("Braid: #{message}")
    message_file.flush
    message_file.close
    cmd << " -F #{message_file.path}"
  end
  cmd << " #{args.join(' ')}" unless args.empty?
  status, out, err = exec(cmd)
  message_file.unlink if message_file

  if status == 0
    true
  elsif out.match(/nothing.* to commit/)
    false
  else
    raise ShellExecutionError, err
  end
end

#config(args) ⇒ Object 



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# File 'lib/braid/operations.rb', line 344

def config(args)
  invoke(:config, args) rescue nil
end

#diff_to_stdout(*args) ⇒ Object 



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# File 'lib/braid/operations.rb', line 364

def diff_to_stdout(*args)
  # For now, ignore the exit code.  It can be 141 (SIGPIPE) if the user
  # quits the pager before reading all the output.
  system("git diff #{args.join(' ')}")
end

#ensure_clean! ⇒ Object 



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# File 'lib/braid/operations.rb', line 375

def ensure_clean!
  status_clean? || raise(LocalChangesPresent)
end

#fetch(remote = nil, *args) ⇒ Object 



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# File 'lib/braid/operations.rb', line 189

def fetch(remote = nil, *args)
  args.unshift "-n #{remote}" if remote
  exec!("git fetch #{args.join(' ')}")
end

#get_tree_item(tree, path) ⇒ Object

Get the item at the given path in the given tree. If it’s a tree, just return its hash; if it’s a blob, return a BlobWithMode object. (This is how we remember the mode for single-file mirrors.)



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# File 'lib/braid/operations.rb', line 271

def get_tree_item(tree, path)
  if path.nil? || path == ''
    tree
  else
    m = /^([^ ]*) ([^ ]*) ([^\t]*)\t.*$/.match(invoke(:ls_tree, tree, path))
    mode = m[1]
    type = m[2]
    hash = m[3]
    if type == 'tree'
      hash
    elsif type == 'blob'
      return BlobWithMode.new(hash, mode)
    else
      raise ShellExecutionError, 'Tree item is not a tree or a blob'
    end
  end
end

#head ⇒ Object 



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# File 'lib/braid/operations.rb', line 379

def head
  rev_parse('HEAD')
end

#is_inside_worktree ⇒ Object

If the current directory is not inside a git repository at all, this command will fail with “fatal: Not a git repository” and that will be propagated as a ShellExecutionError. is_inside_worktree can return false when inside a bare repository and in certain other rare cases such as when the GIT_WORK_TREE environment variable is set.



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# File 'lib/braid/operations.rb', line 154

def is_inside_worktree
  invoke(:rev_parse, '--is-inside-work-tree') == 'true'
end

#make_tree_with_item(main_content, item_path, item) ⇒ Object 



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# File 'lib/braid/operations.rb', line 330

def make_tree_with_item(main_content, item_path, item)
  with_temporary_index do
    # If item_path is '', then rm_r_cached will fail.  But in that case,
    # we can skip loading the main content because it would be deleted
    # anyway.
    if main_content && item_path != ''
      read_tree_im(main_content)
      rm_r_cached(item_path)
    end
    add_item_to_index(item, item_path, false)
    write_tree
  end
end

#merge_base(target, source) ⇒ Object

Returns the base commit or nil.



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# File 'lib/braid/operations.rb', line 200

def merge_base(target, source)
  invoke(:merge_base, target, source)
rescue ShellExecutionError
  nil
end

#merge_trees(base_treeish, local_treeish, remote_treeish) ⇒ Object

Merge three trees (local_treeish should match the current state of the index) and update the index and working tree.

The usage of ‘git merge-recursive’ doesn’t seem to be officially documented, but it does accept trees. When a single base is passed, the ‘recursive’ part (i.e., merge of bases) does not come into play and only the trees matter. But for some reason, Git’s smartest tree merge algorithm is only available via the ‘recursive’ strategy.



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# File 'lib/braid/operations.rb', line 244

def merge_trees(base_treeish, local_treeish, remote_treeish)
  invoke(:merge_recursive, base_treeish, "-- #{local_treeish} #{remote_treeish}")
  true
rescue ShellExecutionError => error
  # 'CONFLICT' messages go to stdout.
  raise MergeError, error.out
end

#read_ls_files(prefix) ⇒ Object 



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# File 'lib/braid/operations.rb', line 252

def read_ls_files(prefix)
  invoke('ls-files', prefix)
end

#read_tree_im(treeish) ⇒ Object

Read tree into the root of the index. This may not be the preferred way to do it, but it seems to work.



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# File 'lib/braid/operations.rb', line 310

def read_tree_im(treeish)
  invoke(:read_tree, '-im', treeish)
  true
end

#relative_working_dir ⇒ Object

Get the prefix of the current directory relative to the worktree. Empty string if it’s the root of the worktree, otherwise ends with a slash. In some cases in which the current directory is not inside a worktree at all, this will successfully return an empty string, so it may be desirable to check is_inside_worktree first.



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# File 'lib/braid/operations.rb', line 163

def relative_working_dir
  invoke(:rev_parse, '--show-prefix')
end

#remote_add(remote, path) ⇒ Object

Implies tracking.



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# File 'lib/braid/operations.rb', line 213

def remote_add(remote, path)
  invoke(:remote, 'add', remote, path)
  true
end

#remote_rm(remote) ⇒ Object 



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# File 'lib/braid/operations.rb', line 218

def remote_rm(remote)
  invoke(:remote, 'rm', remote)
  true
end

#remote_url(remote) ⇒ Object

Checks git remotes.



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# File 'lib/braid/operations.rb', line 224

def remote_url(remote)
  key = "remote.#{remote}.url"
  invoke(:config, key)
rescue ShellExecutionError
  nil
end

#repo_file_path(path) ⇒ Object

Get the physical path to a file in the git repository (e.g., ‘MERGE_MSG’), taking into account worktree configuration. The returned path may be absolute or relative to the current working directory.



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# File 'lib/braid/operations.rb', line 140

def repo_file_path(path)
  if require_version('2.5')  # support for --git-path
    invoke(:rev_parse, '--git-path', path)
  else
    # Git < 2.5 doesn't support linked worktrees anyway.
    File.join(invoke(:rev_parse, '--git-dir'), path)
  end
end

#reset_hard(target) ⇒ Object 



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# File 'lib/braid/operations.rb', line 231

def reset_hard(target)
  invoke(:reset, '--hard', target)
  true
end

#rev_parse(opt) ⇒ Object 



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# File 'lib/braid/operations.rb', line 206

def rev_parse(opt)
  invoke(:rev_parse, opt)
rescue ShellExecutionError
  raise UnknownRevision, opt
end

#rm_r(path) ⇒ Object 



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# File 'lib/braid/operations.rb', line 348

def rm_r(path)
  invoke(:rm, '-r', path)
  true
end

#rm_r_cached(path) ⇒ Object

Remove from index only.



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# File 'lib/braid/operations.rb', line 354

def rm_r_cached(path)
  invoke(:rm, '-r', '--cached', path)
  true
end

#status_clean? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/braid/operations.rb', line 370

def status_clean?
  status, out, err = exec('git status')
  !out.split("\n").grep(/nothing to commit/).empty?
end

#tree_hash(path, treeish = 'HEAD') ⇒ Object 



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# File 'lib/braid/operations.rb', line 359

def tree_hash(path, treeish = 'HEAD')
  out = invoke(:ls_tree, treeish, '-d', path)
  out.split[2]
end

#with_temporary_index ⇒ Object

Execute a block using a temporary git index file, initially empty.



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# File 'lib/braid/operations.rb', line 321

def with_temporary_index
  Dir.mktmpdir('braid_index') do |dir|
    Operations::with_modified_environment(
      {'GIT_INDEX_FILE' => File.join(dir, 'index')}) do
      yield
    end
  end
end

#write_tree ⇒ Object

Write a tree object for the current index and return its ID.



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# File 'lib/braid/operations.rb', line 316

def write_tree
  invoke(:write_tree)
end