git.rb

   1 require 'git/internal/object'
   2 require 'git/internal/pack'
   3 require 'git/internal/loose'
   4 require 'git/object'
   5
   6 module Git
   7   class Repository
   8     def initialize(git_dir)
   9       @git_dir = git_dir
  10     end
  11
  12     def get_object_by_sha1(sha1)
  13       r = get_raw_object_by_sha1(sha1)
  14       return nil if !r
  15
  16       case r.type
  17       when :blob
  18         return Blob.new(r, self)
  19       when :tree
  20         return Tree.new(r, self)
  21       when :commit
  22         return Commit.new(r, self)
  23       when :tag
  24         return Tag.new(r, self)
  25       else
  26         raise RuntimeError, "got invalid object-type"
  27       end
  28     end
  29
  30     def get_raw_object_by_sha1(sha1)
  31       sha1 = [sha1].pack("H*")
  32       packs = Dir.glob(@git_dir + '/objects/pack/pack-*.pack')
  33
  34       # try packs
  35       packs.each do |pack|
  36         storage = Git::Internal::PackStorage.new(pack)
  37         o = storage[sha1]
  38         return o if o
  39       end
  40
  41       # try loose storage
  42       storage = Git::Internal::LooseStorage.new(@git_dir+'/objects')
  43       o = storage[sha1]
  44       return o if o
  45
  46       # try packs again, maybe the object got packed in the meantime
  47       packs.each do |pack|
  48         storage = Git::Internal::PackStorage.new(pack)
  49         o = storage[sha1]
  50         return o if o
  51       end
  52
  53       return nil
  54     end
  55   end
  56 end