Permission denied running a method from a Ruby gem

问题

I'm using a gem called IMGKit and when I use the gem's to_img method in the console I get this error:

IMGKit::CommandFailedError: Command failed: /rubyprograms/search --format jpg http://google.com -: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open3.rb:67:in `exec': Permission denied - /rubyprograms/search (Errno::EACCES)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open3.rb:67:in `popen3'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/open3.rb:53:in `fork'

I have no clue what's going on.

This is the to_img method:

def to_img(format = nil)
  append_stylesheets
  set_format(format)

  result = nil
  stderr_output = nil
  Open3.popen3(*command) do |stdin,stdout,stderr|
    stdin << (@source.to_s) if @source.html?
    stdin.close
    result = stdout.gets(nil)
    result.force_encoding("ASCII-8BIT") if result.respond_to? :force_encoding
    stderr_output = stderr.readlines.join
    stdout.close
    stderr.close
  end
  raise CommandFailedError.new(command.join(' '), stderr_output)  unless result
  return result
end

回答1:

This means the user as which your Ruby program is executed does not have the permissions to read or execute the file at /rubyprograms/search (or possible the /rubyprograms directory itself). Check if the directory and/or file exist and are executable by your user. If doesn't exist then you'll need to install some packages or adjust the path in the gem's configuration. If it exists then maybe you need to change ownership or permissions using chown/chmod.

来源：https://stackoverflow.com/questions/6515807/permission-denied-running-a-method-from-a-ruby-gem