rbsync

Synchronize files src to dest . 
this class can sync files and recuresively
options are
+sync update file only
+no overwrite when dist files are newer than src
+sync by file digest hash , not useing filename

== usage
=== mirror files
同期元と同期先を同じにする
          require 'rbsync'
          rsync =RbSync.new
          rsync.sync( "src", "dest" )
=== mirror updated only files
同期先に、同期元と同名のファイルがあったら、更新日時を調べる。新しいモノだけをコピーする．
          require 'rbsync'
          rsync =RbSync.new
          rsync.sync( "src", "dest",{:update=>true} )
=== using exclude pattern
同期先と同期元を同じにする，但し、*.rb / *.log の拡張子は除外する．
          require 'rbsync'
          rsync =RbSync.new
          rsync.sync( "src", "dest",{:excludes=>["*.log","*.bak"]} )
== sync by another name  if file name confilicts
send src file with anothername. when file name confilicts
名前が衝突した場合で、ファイルを書換える時は，転送元のファイルを別名で転送する
windows のファイルコピーっぽい動作
before sync
|src  | test.txt | 2011-06-14
|dest | test.txt | 2011-06-12
after sync
|src  | test.txt    | 2011-06-14
|dest | test(1).txt | 2011-06-14 # same to src
|dest | test.txt    | 2011-06-12
== sync with backup 
名前が衝突した場合で、ファイルを書換える場合転送先のファイルを別名で保存してから転送する
before sync
|src  | test.txt | 2011-06-14
|dest | test.txt | 2011-06-12
after sync
|src  | test.txt                   | 2011-06-14
|dest | test.txt                   | 2011-06-14 # same to src
|dest | test_20110614022255.txt    | 2011-06-12 # moved

==special usage , sync by file cotetets 
if directory has a same file with different file name. insted of filename , sync file by file hash
when files are theses,
 |src| test.txt | "47bce5c74f589f4867dbd57e9ca9f808" |
 |dst| test.bak | "47bce5c74f589f4867dbd57e9ca9f808" |
:check_hash results no effect.
ディレクトリ内のファイル名をうっかり変えてしまったときに使う．ファイル名でなく、ファイルの中身を比較して同期する．
 |src| test.txt | "47bce5c74f589f4867dbd57e9ca9f808" |
 |dst| test.bak | "47bce5c74f589f4867dbd57e9ca9f808" |
の場合何もおきません
          require 'rbsync'
          rsync =RbSync.new
          rsync.sync( "src", "dest",{:check_hash=>true} )
=== directory has very large file ,such as mpeg video
using with :check_hash=>true
checking only head of 1024*1024 bytes to distinguish src / dest files.this is for speed up.
FileUtils::cmp is reading whole file. large file will take time.With :hash_limit_size Rbsync read only head of files for comparing.
巨大なファイルだと，全部読み込むのに時間が掛かるので、先頭1024*1024 バイトを比較してOKとする.写真とかはコレで十分
ファイル名を書換えてしまってコンテンツ内容の比較だけで使う。
:check_hash=>true とペアで使います
          require 'rbsync'
          rsync =RbSync.new
          rsync.sync( "src", "dest",{:check_hash=>true,:hash_limit_size=1024*1024} )

=== sync both updated files
To sync both, call sync methods twice 
双方向に同期させたい場合は２回起動する．
          require 'rbsync'
          rsync =RbSync.new
          rsync.updated_file_only = true
          rsync.sync( "src", "dest" )
          rsync.sync( "dest", "src" )# swap src to dest , dest to src

Contributing to rbsync

Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet
Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it
Fork the project
Start a feature/bugfix branch
Commit and push until you are happy with your contribution
Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

rbsync

Contributing to rbsync

Copyright