Move the call to `pytest.importorskip()` function into a specific test
case that relies on imported modules. This will make test cases in the
same file to be run, even if importing the modules fail.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
Introduce a new class `SpdxLicenseExpressionCreator`, responsible for
converting license texts extracted from packages, into an SPDX-compliant
license expressions. If the `license_expression` Python package is
available on the system, it is used to determine the license text
extracted from a package is a valid SPDX license expression. If it is,
it's returned as is back to the caller. If it is not, or of the package
is not available on the system, the license text is wrapped in a
`ExtractedLicensingInfo` instance.
The `SpdxLicenseExpressionCreator` object keeps track of all generated
`ExtractedLicensingInfo` instances and de-duplicates them based on the
license text. This means that if two packages use the same
SPDX-non-compliant license text, they will be wrapped by an
`ExtractedLicensingInfo` instance with the same `LicenseRef-` ID.
The reason for fallback when `license_expression` package is not
available is that it is not available on RHEL and CentOS Stream. This
implementation allows us to ship the functionality in RHEL and
optionally enabling it by installing `license_expression` from a 3rd
party repository. In any case, the generated SBOM document will always
contain valid SPDX license expressions.
Extend unit tests to cover the newly added functionality.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
FIXUP: sbom/spdx: use compliant license expressions
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
Add implementation of standard-agnostic model for SBOM, and simple SPDX
v2.3 model. Also add convenience functions for converting DNF4 package
set to the standard-agnostic model and for converting it to SPDX model.
Cover the functionality with unit tests.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
