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Getting started

If you'd like to work on the Python code that processes files for Circlean, you should take a look at PyCIRCLean, specifically the filecheck.py script. To get started contributing to Circlean, first, fork the project and git clone your fork. Then, follow the instructions in setup_with_proot.md to build an image. To make things easier, you can also download a prebuilt image as mentioned in the README, and then mount and make modifications to this image to test your changes.

The issue tracker

If you find a bug or see a problem with PyCIRCLean, please open an issue in the Github repo. We'll do our best to respond as quickly as possible. Also, feel free to contribute a solution to any of the open issues - we'll do our best to review your pull request in a timely manner. This project is in active development, so any contributions are welcome!

Dependencies

  • Timidity for playing midi files
  • Git for installing some Python dependencies
  • 7Zip for unpacking archives
  • ntfs-3g, exfat-fuse for mounting usb key partitions
  • Python 3 and pip for installing and running Python dependencies
  • Python3-lxml for handling ooxml and other Office files in filecheck.py
  • libjpeg-dev, libtiff-dev, libwebp-dev, liblcms2-dev, tcl-dev, tk-dev, and python-tk for various image formats (dependencies for pillow)
  • Exifread for file metadata
  • Pillow for handling images
  • Olefile, oletools, and officedissector for handling various Office filetypes
  • PyCIRCLean for main file handling code

Helper scripts

Use the scripts in shell_utils/ as examples - do not run them blindly as you will most probably have to change some constants/paths accordingly to your configuration.

IN ALL CASES, PLEASE READ THE COMMENTS IN THE SCRIPTS AT LEAST ONCE.

  • proper_chroot.sh: uses qemu to chroot into a raspbian instance (.img or SD Card)
  • prepare_rPI.sh: update the system, some configuration
  • create_user.sh: create the user who will run the scripts, assign the proper sudo rights.
  • copy_to_final.sh: populate the content of the directory fs/ in the image, contains a sample of dd command to write the image on the SD card. NOTE: TAKE CARE NOT TO USE THE WRONG DESTINATION

Running the tests

  • If you've made changes to the shell scripts, start by installing and running Shellcheck.

  • To emulate the Raspberry Pi hardware for testing, we'll be using Qemu, an open source machine emulator. The "qemu" package available for Ubuntu/Debian includes all of the required packages (including qemu-system-arm) except for qemu-user-static, which must be installed separately.

    sudo apt-get install qemu qemu-user-static expect
  • Get the qemu kernel for the image you are using:
   pushd tests; wget https://github.com/dhruvvyas90/qemu-rpi-kernel/raw/master/kernel-qemu; popd

  • Put some test data from tests/testFiles into tests/content_img_vfat_norm

  • Comment out the other tests in tests/run.sh or populate those directories as well

  • Make sure to set the filename of the image and the kernel in tests/run.sh

  • Run the tests:

    sudo ./run_tests.sh
  • If the image run processed images correctly but doesn't exit and unmount the images cleanly, look at tests/run.exp and make sure it's waiting for the string your qemu and kernel actually produce.