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Gollum::GitAccess

Controls all access to the Git objects from Gollum. Extend this class to add custom caching for special cases.

Attributes

commit_map[R]

Gets a Hash cache of commit SHAs to the Grit::Commit instance.

{"abcd123" => <Grit::Commit>}
path[R]

Gets the String path to the Git repository.

ref_map[R]

Gets a Hash cache of refs to commit SHAs.

{"master" => "abc123", ...}
repo[R]

Gets the Grit::Repo instance for the Git repository.

tree_map[R]

Gets a Hash cache of commit SHAs to a recursive tree of blobs.

{"abc123" => [<BlobEntry>, <BlobEntry>]}

Public Class Methods

new(path, page_file_dir = nil, bare = false) click to toggle source

Initializes the GitAccess instance.

path - The String path to the Git repository that holds the

Gollum site.

page_file_dir - String the directory in which all page files reside

Returns this instance.

# File lib/gollum-lib/git_access.rb, line 12
def initialize(path, page_file_dir = nil, bare = false)
  @page_file_dir = page_file_dir
  @path = path
  @repo = Grit::Repo.new(path, { :is_bare => bare })
  clear
end

Public Instance Methods

blob(sha) click to toggle source

Public: Fetches the contents of the Git blob at the given SHA.

sha - A String Git SHA.

Returns the String content of the blob.

# File lib/gollum-lib/git_access.rb, line 63
def blob(sha)
  cat_file!(sha)
end
cat_file!(sha) click to toggle source

Reads the content from the Git db at the given SHA.

sha - The String SHA.

Returns the String content of the Git object.

# File lib/gollum-lib/git_access.rb, line 181
def cat_file!(sha)
  @repo.git.cat_file({:p => true}, sha)
end
clear() click to toggle source

Public: Clears all of the cached data that this GitAccess is tracking.

Returns nothing.

# File lib/gollum-lib/git_access.rb, line 90
def clear
  @ref_map    = {}
  @tree_map   = {}
  @commit_map = {}
end
commit(ref) click to toggle source

Public: Looks up the Git commit using the given Git SHA or ref.

ref - A String Git SHA or ref.

Returns a Grit::Commit.

# File lib/gollum-lib/git_access.rb, line 72
def commit(ref)
  if sha?(ref)
    get_cache(:commit, ref) { commit!(ref) }
  else
    if sha = get_cache(:ref, ref)
      commit(sha)
    else
      if cm = commit!(ref)
        set_cache(:ref,    ref,   cm.id)
        set_cache(:commit, cm.id, cm)
      end
    end
  end
end
commit!(sha) click to toggle source

Reads a Git commit.

sha - The string SHA of the Git commit.

Returns a Grit::Commit.

# File lib/gollum-lib/git_access.rb, line 190
def commit!(sha)
  @repo.commit(sha)
end
decode_git_path(path) click to toggle source

Decode octal sequences (NNN) in tree path names.

path - String path name.

Returns a decoded String.

# File lib/gollum-lib/git_access.rb, line 239
def decode_git_path(path)
  if path[0] == "" && path[-1] == ""
    path = path[1...-1]
    path.gsub!(/\\\d{3}/)   { |m| m[1..-1].to_i(8).chr }
  end
  path.gsub!(/\\[rn"\\]/) { |m| eval(%("#{m.to_s}")) }
  path
end
exist?() click to toggle source

Public: Determines whether the Git repository exists on disk.

Returns true if it exists, or false.

# File lib/gollum-lib/git_access.rb, line 22
def exist?
  @repo.git.exist?
end
get_cache(name, key) click to toggle source

Attempts to get the given data from a cache. If it doesn’t exist, it’ll pass the results of the yielded block to the cache for future accesses.

name - The cache prefix used in building the full cache key. key - The unique cache key suffix, usually a String Git SHA.

Yields a block to pass to the cache. Returns the cached result.

# File lib/gollum-lib/git_access.rb, line 202
def get_cache(name, key)
  cache = instance_variable_get("@#{name}_map")
  value = cache[key]
  if value.nil? && block_given?
    set_cache(name, key, value = yield)
  end
  value == :_nil ? nil : value
end
parse_tree_line(line) click to toggle source

Parses a line of output from the `ls-tree` command.

line - A String line of output:

"100644 blob 839c2291b30495b9a882c17d08254d3c90d8fb53  Home.md"

Returns an Array of BlobEntry instances.

# File lib/gollum-lib/git_access.rb, line 229
def parse_tree_line(line)
  mode, type, sha, size, *name = line.split(/\s+/)
  BlobEntry.new(sha, name.join(' '), size.to_i, mode.to_i(8))
end
ref_to_sha(ref) click to toggle source

Public: Converts a given Git reference to a SHA, using the cache if available.

ref - a String Git reference (ex: “master”)

Returns a String, or nil if the ref isn’t found.

# File lib/gollum-lib/git_access.rb, line 32
def ref_to_sha(ref)
  ref = ref.to_s
  return if ref.empty?
  sha =
    if sha?(ref)
      ref
    else
      get_cache(:ref, ref) { ref_to_sha!(ref) }
    end.to_s
  sha.empty? ? nil : sha
end
ref_to_sha!(ref) click to toggle source

Looks up the Git SHA for the given Git ref.

ref - String Git ref.

Returns a String SHA.

# File lib/gollum-lib/git_access.rb, line 148
def ref_to_sha!(ref)
  @repo.git.rev_list({:max_count=>1}, ref)
rescue Grit::GitRuby::Repository::NoSuchShaFound
end
refresh() click to toggle source

Public: Refreshes just the cached Git reference data. This should be called after every Gollum update.

Returns nothing.

# File lib/gollum-lib/git_access.rb, line 100
def refresh
  @ref_map.clear
end
set_cache(name, key, value) click to toggle source

Writes some data to the internal cache.

name - The cache prefix used in building the full cache key. key - The unique cache key suffix, usually a String Git SHA. value - The value to write to the cache.

Returns nothing.

# File lib/gollum-lib/git_access.rb, line 218
def set_cache(name, key, value)
  cache      = instance_variable_get("@#{name}_map")
  cache[key] = value || :_nil
end
sha?(str) click to toggle source

Checks to see if the given String is a 40 character hex SHA.

str - Possible String SHA.

Returns true if the String is a SHA, or false.

# File lib/gollum-lib/git_access.rb, line 139
def sha?(str)
  !!(str =~ /^[0-9a-f]{40}$/)
end
tree(ref) click to toggle source

Public: Gets a recursive list of Git blobs for the whole tree at the given commit.

ref - A String Git reference or Git SHA to a commit.

Returns an Array of BlobEntry instances.

# File lib/gollum-lib/git_access.rb, line 50
def tree(ref)
  if sha = ref_to_sha(ref)
    get_cache(:tree, sha) { tree!(sha) }
  else
    []
  end
end
tree!(sha) click to toggle source

Looks up the Git blobs for a given commit.

sha - String commit SHA.

Returns an Array of BlobEntry instances.

# File lib/gollum-lib/git_access.rb, line 158
def tree!(sha)
  tree  = @repo.git.native(:ls_tree,
    {:r => true, :l => true, :z => true}, sha)
  if tree.respond_to?(:force_encoding)
    tree.force_encoding("UTF-8")
  end
  items = tree.split("\00"").inject([]) do |memo, line|
    memo << parse_tree_line(line)
  end

  if dir = @page_file_dir
    regex = /^#{dir}\//
    items.select { |i| i.path =~ regex }
  else
    items
  end
end

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