Paperclip File Not Found Error

Question

I just switched from a paperclip rails plugin to a paperclip gem. The project is a rails 2.3 application and I am using paperclip 2.7.2 gem.

I am getting the following odd error:

identify: unable to open image `file': No such file or directory @ error/blob.c/OpenBlob/2617.
identify: no decode delegate for this image format `file' @ error/constitute.c/ReadImage/544.

Seems like paperclip is looking for a file called 'file' but I am not sure why. I didn't change any of the code we had before. It used to work, all I did was upgrade to a newer version and use a gem over a plugin.

Any ideas?

Update

It to be a bug in paper clip where it does not parse the content of the command properly. I dug deep into the paperclip source to find:

def run(cmd, arguments = "", local_options = {})
  if options[:image_magick_path]
    Paperclip.log("[DEPRECATION] :image_magick_path is deprecated and will be removed. Use :command_path instead")
  end
  command_path = options[:command_path] || options[:image_magick_path]
  Cocaine::CommandLine.path = [Cocaine::CommandLine.path, command_path].flatten.compact.uniq
  local_options = local_options.merge(:logger => logger) if logging? && (options[:log_command] || local_options[:log_command])

  Cocaine::CommandLine.new(cmd, arguments, local_options).run
end

and

# Uses ImageMagick to determing the dimensions of a file, passed in as either a
# File or path.
# NOTE: (race cond) Do not reassign the 'file' variable inside this method as it is likely to be
# a Tempfile object, which would be eligible for file deletion when no longer referenced.
def self.from_file file
  file_path = file.respond_to?(:path) ? file.path : file
  raise(Paperclip::NotIdentifiedByImageMagickError.new("Cannot find the geometry of a file with a blank name")) if file_path.blank?
  geometry = begin
               Paperclip.run("identify", "-format %wx%h :file", :file => "#{file_path}[0]")
             rescue Cocaine::ExitStatusError
               ""
             rescue Cocaine::CommandNotFoundError => e
               raise Paperclip::CommandNotFoundError.new("Could not run the `identify` command. Please install ImageMagick.")
             end
  parse(geometry) ||
    raise(NotIdentifiedByImageMagickError.new("#{file_path} is not recognized by the 'identify' command."))
end

The Paperclip.run command fails to replace the :file placeholder for some reason. I verified this by running the following on the commandline:

identify :file

Monkey patching the replacement by hand yields other errors where a similar thing happens.

Answer 1

Ok I managed to solve it.

It was a problem with Cocaine. Seems paperclip has a dependency on cocaine that only says it must be Cociane > 0.02. The latest version of Cocaine 0.4.2 (at the time of this writing) has a new API which is not backward compatible. You need to downgrade to Cocaine 0.3.2.

Simply put this in your Gemfile before paperclip:

gem "cocaine", "0.3.2"