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• How to properly escape shell arguments on Windows ?

  20 novembre 2016, par PeeHaa

  I am trying to properly escape user supplied data for a command line script. Normally I would use escapeshellarg, however this will simply not work because it’s breaks the eventual command line in glorious ways.

  The use case is trying to add meta data to videos using ffmpeg. A simplified and isolated problem case is the following command :

  ffmpeg -i in.mp4 -metadata author="My Name" out.mp4

  The author value is user supplied (My Name). I tried escaping only the user supplied part which resulted in :

  ffmpeg -i in.mp4 -metadata author=""My Name"" out.mp4

  Which results in the following ffmpeg error :

  Name : Invalid argument

  Next I tried escaping the entire flag (-metadata author="My Name") which results in :

  ffmpeg -i in.mp4 "-metadata author= My Name " out.mp4

  "Unrecognized option ’metadata author= My Name ’.

  Test cases :

  $flag = '-metadata author="%s"';
  
  
  
  var_dump(sprintf($flag, escapeshellarg('My Name')));
  
  var_dump(escapeshellarg(sprintf($flag, 'My Name')));

  Is there anything that will properly escape the user supplied data so that users cannot pass arbitrary flags to my command and that will make ffmpeg happy without having to do it manually with the risk of forgetting something and screwing it up ?

  Update

  I also tried escaping the entire flag value which works unless there is a double quote inside the user supplied part :

  $flag = 'author="%s"';
  
  
  
  var_dump('-metadata ' . escapeshellarg(sprintf($flag, 'My Name')));
  
  var_dump('-metadata ' . escapeshellarg(sprintf($flag, 'My "Name"')));

  Which results in :

  -metadata "author= My Name "
  
  -metadata "author= My  Name  " // it eats my quotes

• Piwik 3 Development Update #2 – Git master branch will become Piwik 3

  2 septembre 2016, par Piwik Core Team — Community, Development

  As mentioned in the Piwik 3 Development Update #1 we are actively working on the new major Piwik 3 release.

  This blog post is an announcement regarding an upcoming change on our Git repository.

  On October 4th CET, we will merge the current changes done for Piwik 3 from the “3.x-dev” branch into the “master“ branch across our Piwik projects and plugin repositories. While this is not important for most of our users, it can be a problem if you have installed and deployed Piwik from git.

  • If you are currently on “master” branch and want to continue using Piwik 2, you need to checkout the newly created “2.x-dev” branch instead of “master” anytime within the next 4 weeks. Don’t forget to update your scripts and scheduled tasks (cronjobs) that may reference “master” branch.
  • If you want to receive an early version of Piwik 3 via git automatically, you won’t have to change anything.

  The final Piwik 3 release will be ready before the end of the year. If you want to give it a try, you can either use Piwik from Git and check out the “3.x-dev” branch, or download Piwik 3 from GitHub.

  Until our next Piwik 3 dev update, Happy analysis !

• Merge commit ’6d3ea1957f681b3bf9c752e6d21a501cc8d4180d’

  16 décembre 2013, par Michael Niedermayer

  Merge commit ’6d3ea1957f681b3bf9c752e6d21a501cc8d4180d’
  * commit ’6d3ea1957f681b3bf9c752e6d21a501cc8d4180d’ :
  
    Bump major of libavfilter for reference counted buffer API changes.
  Conflicts :
  
  	libavfilter/version.h
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/APIchanges
  • [DH] libavfilter/version.h