basecamp/fast_remote_cache

A faster version of Capistrano's remote_cache deployment strategy

fast_remote_cache's Issues

git reset --hard breaks the hard links

Although the copy.rb script will make the copy into the release directory fast, this time is actually just shifting to the git reset --hard command since it will break all the hard links, even for unchanged files. Breaking hard links equates to copying the file to replace the hard link.

Ideally this would be fixed in git, but as a workaround I found that git reset --mixed #{revision} && git checkout -f . checks out the files without breaking hard links, so actually speeds up deploys when using fast_remote_cache.

Adding the following to config/deploy.rb will speed up deploys by using avoid git reset --hard.

module FastGitSync
  def sync(revision, destination)
    git     = command
    remote  = origin
    branch  = head

    execute = []
    execute << "cd #{destination}"

    execute << "#{git} fetch #{verbose} #{remote} +#{branch}:refs/remotes/#{remote}/#{branch}"

    # Reset the git index
    execute << "#{git} reset #{verbose} --mixed #{revision}"

    # Checkout the index into the work tree
    execute << "#{git} checkout -f ."

    # Remove untracked files
    execute << "#{git} clean #{verbose} -d -x -f"

    execute.join(" && ")
  end
end

set(:source) { Capistrano::Deploy::SCM.new(scm, self).extend(FastGitSync) }

Some conditions from sync where removed for brevity. See the original source for the sync method for details.

Any thoughts on how this change should be integrated into fast_remote_cache?

No such file or directory -- /data/myapp/shared/bin/copy.rb (LoadError)

Trying to use fast_remote_cache for the first time, I get:

    copying the cached version to /data/myapp/releases/20100317102524
  * executing "ruby /data/myapp/shared/bin/copy.rb /data/myapp/shared/cached-copy /data/myapp/releases/20100317102524 test doc && (echo 211ffbb4792233899a947d745fb89e14d0d0374b > /data/myapp/releases/20100317102524/REVISION)"
    servers: ["myhost.com"]
    [myhost.com] executing command
 ** [out :: myhost.com] ruby:
 ** [out :: myhost.com] No such file or directory -- /data/myapp/shared/bin/copy.rb (LoadError)
    command finished

I'm on ruby 1.8.7, Capistrano 2.5.18, Rails 2.3.5 with the proper line in my Capfile. I added:

set :deploy_via,          :fast_remote_cache
set :copy_exclude,        %w(test doc)

to my config/deploy.rb

Here is the full deploy log: https://gist.github.com/1931a5a675becab7a13d

Why is it running "git ls-remote"? Isn't that superseded by fast_remote_cache?