function pdf_to_image_shell_exec in PDF to ImageField 7.3

Run the given command (expected to be an imageMagick Commandline).

Wrapped in a bugfix workaround.

Parameters

string $command: Command to execute.

Return value

string the shell response

3 calls to pdf_to_image_shell_exec()

pdf_to_image_check_imagemagick in ./pdf_to_image.module

Check the binary path of 'convert' on the server.

pdf_to_image_convert_exec in ./pdf_to_image.module

Actually execute the shell command.

pdf_to_image_count_pages in ./pdf_to_image.module

Use imagemagick routine to count the number of pages in a given PDF.

File

./pdf_to_image.module, line 786

Generates thumbnail image(s) from an uploaded PDF.

Code

function pdf_to_image_shell_exec($command) {

  // Horrible bug. If running on Acquia dev desktop, it sets a custom path for
  // the dynamic link library. But 2012-04 that was OLDER than the libraries
  // My OS expected to use to run graphics utilities with.
  // Reason: Incompatible library version:
  // dot requires version 10.0.0 or later,
  // but libltdl.7.dylib provides version 9.0.0
  // UNSET the Acquia DYLD_LIBRARY_PATH before dropping to commandline to run.
  $dyld_library_path = getenv("DYLD_LIBRARY_PATH");
  putenv("DYLD_LIBRARY_PATH=");

  // This looks like a no-op, but it's actually sometimes neccessary
  // (maybe just under dev desktop)
  // in order to allow gs to be found! Mad.
  putenv('PATH=' . getenv('PATH'));
  watchdog('pdf_to_image', 'Running commandline %command', array(
    '%command' => $command,
  ), WATCHDOG_DEBUG);

  // Capture error output in the response as well.
  $response = shell_exec($command);

  // Put it back just in case it matters.
  putenv("DYLD_LIBRARY_PATH={$dyld_library_path}");
  return $response;
}