ruby-buildをあるブランチに同期させる場合，ruby_buildのupgrade ⇒ "sync" or Trueを指定します． っで，そうすると頻繁にこのようなエラーが出てきました．

  * package[tar] action install (up to date)
  * package[bash] action install (up to date)
  * package[curl] action install (up to date)
  * package[git] action install (skipped due to not_if)
  * execute[Install ruby-build] action nothing (skipped due to action :nothing)
  * directory[/tmp/chef-solo] action create (up to date)
  * git[/tmp/chef-solo/ruby-build] action sync
================================================================================
Error executing action `sync` on resource 'git[/tmp/chef-solo/ruby-build]'
================================================================================


Mixlib::ShellOut::ShellCommandFailed
------------------------------------
Expected process to exit with [0], but received '128'
---- Begin output of git remote add origin https://github.com/sstephenson/ruby-build.git ----
STDOUT:
STDERR: fatal: Not a git repository (or any of the parent directories): .git
---- End output of git remote add origin https://github.com/sstephenson/ruby-build.git ----
Ran git remote add origin https://github.com/sstephenson/ruby-build.git returned 128


Resource Declaration:
---------------------
# In /tmp/chef-solo/cookbooks/ruby_build/recipes/default.rb

 58: git src_path do #~FC043 exception to support AWS OpsWorks using an older Chef
 59:   repository  git_url
 60:   reference   git_ref
 61:
 62:   if upgrade_strategy == "none"
 63:     action    :checkout
 64:   else
 65:     action    :sync
 66:   end
 67:



Compiled Resource:
------------------
# Declared in /tmp/chef-solo/cookbooks/ruby_build/recipes/default.rb:58:in `from_file'

git("/tmp/chef-solo/ruby-build") do
  provider Chef::Provider::Git
  action [:sync]
  retries 0
  retry_delay 2
  destination "/tmp/chef-solo/ruby-build"
  revision "master"
  remote "origin"
  cookbook_name :ruby_build
  recipe_name "default"
  repository "https://github.com/sstephenson/ruby-build.git"
end



[2013-11-23T14:21:40+09:00] ERROR: Running exception handlers
[2013-11-23T14:21:40+09:00] ERROR: Exception handlers complete
[2013-11-23T14:21:40+09:00] FATAL: Stacktrace dumped to /tmp/chef-solo/chef-stacktrace.out
Chef Client failed. 5 resources updated
[2013-11-23T14:21:40+09:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)
ERROR: RuntimeError: chef-solo failed. See output above.

この現象が起こった際，cookbookのソースを読んでもRubyスキルの低さゆえにはっきりとした原因も暫定対処法もわからずごにょごにょやっていたらいつの間にか更新ができるようになっていた．という日々を過ごしていました（苦笑

っで，今日もその作業をしようとしたのですが上記エラーが出てきて困ったのですが，たまたま/tmp/chef-solo/を見たところ，中途半端なディレクトリーが存在しました．

$ ls -a1 ruby-build/
.
..
.git
$ ls -a1 ruby-build/.git/objects/pack/
pack-8e9fb8271aa9880cbe25467769278a534d0ed7cd.idx
pack-8e9fb8271aa9880cbe25467769278a534d0ed7cd.pack

結果的にはこうなっているのが正常な状況なのでしょうか（若干自信はない

$ ls -a1 ruby-build/
.
..
.git
.travis.yml
test

ってことで何らかの理由でgit cloneか何かに失敗していたようです． そこで /tmp/chef-solo/ruby-build/ を削除したのちにknife solo cookを再度実行すると成功しました！！ ということで未来の自分向けのエントリーでした（何