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opam: Allow shared state between loader runs using multi-instance opam root

Antoine R. Dumont requested to merge generated-differential-D6318-source into generated-differential-D6318-target

It allow the opam loader to reuse existing opam root with multiple instances. It's the complementary code that goes with the loader adaptation [1].

As the opam show (cli) [2] version currently packaged does not support the means to enclose the metadata extraction per opam instance (when sharing the same opam root), we actually work around this by opening internal details to opam.

  • [1] swh-lister!406 (closed)

  • [2] opam show is currently the interface we are using to extract and list information about a package. It does work on standalone opam root folder but it comes short when sharing multiple instances within one opam root (for now).

Related to T3590

Test Plan

tox

Migrated from D6318 (view on Phabricator)

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