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This commit disables Sphinx's localisation features when reproducible builds are requested, as determined by a non-empty SOURCE_DATE_EPOCH_ environment variable. The `Reproducible Builds`_ project aims to provide confidence to consumers of packaged software that the artefacts they're downloading and installing have not been altered by the environment they were built in, and can be replicated at a later date if required. Builds of localised documentation using Sphinx currently account for a large category of reproducible build testing failures, because the builders intentionally use varying environment locales at build-time. This can affect the contents of the ``objects.inv`` file. During investigation, it turned out that many ``gettext``-localised values (particularly in Python modules under ``sphinx.domains``) were being translated at module-load-time and would not subsequently be re-localised. This creates two unusual effects: 1. Attempting to write a test case to build the same application in two different languages was not initially possible, as the first-loaded translation catalogue (as found in the ``sphinx.locale.translators`` global variable) would remain in-use for subsequent application builds under different locales. 2. Localisation of strings could vary depending on whether the relevant modules were loaded before or after the resource catalogues were populated. We fix this by performing all translations lazily so that module imports can occur in any order and localisation of inventory entries should occur only when translations of those items are requested. Localisation can then be disabled by configuring the ``gettext`` language to the ISO-639-3 'undetermined' code (``'und'``), as this should not have an associated translation catalogue. We also want to prevent ``gettext`` from attempting to determine the host's locale from environment variables (including ``LANGUAGE``). .. _SOURCE_DATE_EPOCH: https://reproducible-builds.org/docs/source-date-epoch/ .. _Reproducible Builds: https://www.reproducible-builds.org/ |
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| locale2/en/LC_MESSAGES | ||