From: "Ludovic Courtès" <ludo@gnu.org>
To: 33432@debbugs.gnu.org
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 [thread overview]
Message-ID: <20181119161325.7801-1-ludo@gnu.org> (raw)
Hello Guix!
This patch series adds the Software Heritage (SWH) client library initially
discussed at:
https://lists.gnu.org/archive/html/guix-devel/2018-11/msg00285.html
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.
https://docs.softwareheritage.org/devel/swh-vault/api.html
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
status.
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
commit/tag:
https://forge.softwareheritage.org/T1352
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:
https://forge.softwareheritage.org/T1350
Feedback welcome!
Ludo’.
Ludovic Courtès (2):
Add (guix swh).
git-download: Download from Software Heritage as a last resort.
Makefile.am | 1 +
guix/git-download.scm | 64 +++--
guix/swh.scm | 551 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 596 insertions(+), 20 deletions(-)
create mode 100644 guix/swh.scm
--
2.19.1
next reply other threads:[~2018-11-19 16:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-19 16:13 Ludovic Courtès [this message]
2018-11-19 16:24 ` [bug#33432] [PATCH 1/2] Add (guix swh) Ludovic Courtès
2018-11-19 16:24 ` [bug#33432] [PATCH 2/2] git-download: Download from Software Heritage as a last resort Ludovic Courtès
2018-11-21 10:15 ` [bug#33432] On tags Ludovic Courtès
2018-11-26 10:11 ` bug#33432: [PATCH 0/2] Download Git checkouts from Software Heritage as a last resort Ludovic Courtès
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