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[bug#33432] [PATCH 0/2] Download Git checkouts from Software Heritage as

From: Ludovic Courtès
Subject: [bug#33432] [PATCH 0/2] Download Git checkouts from Software Heritage as a last resort
Date: Mon, 19 Nov 2018 17:13:25 +0100

Hello Guix!

This patch series adds the Software Heritage (SWH) client library initially
discussed at:

Furthermore, it uses it in (guix git-download) to download code from SWH
when it is unavailable upstream and on our servers.  This bit relies on
the “vault” API of SWH, which allows you to fetch a checkout as a tarball.
Not all revisions are readily available as tarballs, understandably, so
the vault API has a mechanism that allows you to request the “cooking”
of a specific checkout.  Cooking is asynchronous and can take some time.

When downloading over SWH, the ‘swh-download’ procedure first resolves
the tag (if it’s a tag), then tries to download the corresponding tarball
from the vault.  If the vault doesn’t have it yet, it sends a cooking
request and waits for it to complete by periodically checking the cooking

In the future, we should provide a “lister” and “loader” so that SWH can
regularly obtain a list of Guix packages with their source URL and

The SWH team is also considering pre-cooking all VCS tags such that
every time we refer to a tag, we can be sure its contents are already
available in the vault:

Feedback welcome!


Ludovic Courtès (2):
  Add (guix swh).
  git-download: Download from Software Heritage as a last resort.           |   1 +
 guix/git-download.scm |  64 +++--
 guix/swh.scm          | 551 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 596 insertions(+), 20 deletions(-)
 create mode 100644 guix/swh.scm


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