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nixguix: use the integrity attribute as snapshot branch name

Antoine Eiche requested to merge generated-differential-D2907-source into generated-differential-D2907-target

Snapshot branch names were the url of sources. This url is used for incremental loading: if an url is already existing in the last snapshot, this url is not downloaded again.

Using the url as key for this cache has several drawbacks:

  • if the upstream source is upgraded in place, the snapshot will reuse the previous version of the upstream source.
  • when the loader supports url mirrors, using the url as branch name will be confusing (we won't know which url to use)

Moreover, this integrity attribute will be useful to get artifacts from SWH once a metadata API will be available.

Related to #1991 (closed)

Migrated from D2907 (view on Phabricator)

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