LZV.nrw DCM Bag Builder

This package extends the make_bag method of the bagit library according to the specifications of the project LZV.nrw.

Specifics

An instance of the DCM BagBuilder can be generated, with the optional arguments manifests and tagmanifests to set the algorithms to be used when creating bags. The default checksums are imported from the default set in the bagit library. After instantiation, a BagBuilder-object provides the make_bag-method to create a BagIt-Bag and the property log (a dcm-common Logger-object) containing information on initialization and all build-jobs.

The deviation from the bags generated from the make_bag-method in the bagit-library consists of the following steps:

1. update the BagIt-Version in the bagit.txt to 1.0,

2. update the bag info in the bag-info.txt to account for basic specifications of the LZV.nrw project:

   • addition of the field Bagging-DateTime, and
   • removal of the - now redundant - field Bagging-Date.

3. Optional: If a metadata directory is passed to the method, the directory is moved into the bag - but not into the payload - and the tagmanifest files are renewed.

4. If different algorithms for manifests and tag-manifests are requested, the bag is first created with the union of those two sets but afterwards 'cleaned up' (i.e. unwanted files and entries in tag-manifests are removed).

   This is due to the bagit library not supporting settings the two sets of algorithms individually.

5. Call the basic validation routine is_valid() from the bagit library to validate the bag before returning it.

Setup

Install this package and its dependencies by issuing pip install . .

Test

This repository contains test data for building a bag (located in test_dcm_bag_builder/fixtures):

Run pytest-Tests (install by pip install pytest) with pytest -v -s --cov.

Contributors

• Sven Haubold
• Orestis Kazasidis
• Stephan Lenartz
• Kayhan Ogan
• Michael Rahier
• Steffen Richters-Finger
• Malte Windrath