Stripping Exif Tags

strip_exif_tags_filter.rb

# Custom filter to run exiftool to strip images of every Exif tag. exiftool
# must be installed separately on the system; the filter assumes a Unix-like
# environment.
class StripExifTagsFilter < Nanoc3::Filter
  identifier :strip_exif_tags
  type :binary

  def run filename, params = {}
    tool_present = system 'which exiftool >/dev/null 2>&1'
    if tool_present
      system "exiftool -q -all= -o #{output_filename} -P #{filename}"
      unless $? == 0
        raise "Error running exiftool"
      end
    else
      puts "exiftool not found; skipping"
      FileUtils.cp filename, output_filename
    end
  end
end