GNU bug report logs - #48232
[PATCH 0/2] Add mercurial-commitsigs and some changes to Mercurial.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Xinglu Chen <public <at> yoctocell.xyz>
Subject: bug#48232: closed (Re: [bug#48232] [PATCH v2 0/2] Add
 hg-commitsigs and some changes to Mercurial.)
Date: Mon, 17 May 2021 20:09:02 +0000

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Your bug report

#48232: [PATCH 0/2] Add mercurial-commitsigs and some changes to Mercurial.

which was filed against the guix-patches package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 48232 <at> debbugs.gnu.org.

-- 
48232: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=48232
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Xinglu Chen <public <at> yoctocell.xyz>
To: 48232-done <at> debbugs.gnu.org
Subject: Re: [bug#48232] [PATCH v2 0/2] Add hg-commitsigs and some changes
 to Mercurial.
Date: Mon, 17 May 2021 22:07:55 +0200

The patches have been applied, closing.

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From: Xinglu Chen <public <at> yoctocell.xyz>
To: guix-patches <at> gnu.org
Subject: [PATCH 0/2] Add mercurial-commitsigs and some changes to Mercurial.
Date: Tue, 04 May 2021 22:58:01 +0200

The first patch adds the commitsigs extension for Mercurial, it allows
users to sign Mercurial changesets (equivalent to Git commits) with
GnuPG or OpenSSL.

The second patch adds PYTHONPATH to the ‘native-search-paths’ field of
Mercurial, this allows Mercurial to automatically find third-party
extensions (like commitsigs) installed in
/gnu/store/...-profile/lib/python3.8/site-packages/hgext3rd.  By
default, it only looks at
/gnu/store/...-mercurial/lib/python3.8/site-packages/hgext3rd.

However, I am not sure this is the best approach since it messes with
PYTHONPATH, AFAIK there is no such things as a HGEXTENSIONS variable I
could set.  Another problem is that I have to hardcode “python3.8”, this
would obviously have to be updated if the default Python version gets
updated.  I did try to do something like this:

#+begin_src scheme
(string-append
  "lib/python"
  (string-join
    (drop-right (string-split (package-version python) #\.) 1)
    ".")
  "/site-packages/hgext3rd")
#+end_src

but it just gave me a confusing error message when trying to build it;
it worked fine if I hit {C-x C-e} in Emacs, though.

What we could do instead is to delegate the work of installing Mercurial
extensions to Guix Home[1] (I am currently working on adding a service
for Mercurial[2]) and add a ‘mercurial-extension-file-path’ key to the
‘properties’ field of Mercurial extensions so Guix Home can tell
Mercurial where to find the extension by the relevant lines in hgrc.  We
could have a package definition like this:

#+begin_src scheme
(package
  (name "mercurial-commitsigs")
  ...
  (properties
   '((mercurial-extension-file-path . "commitsigs.py"))))
#+end_src

hgrc:

#+begin_src
[extensions]
commitsigs = /gnu/store/...-mercurial-commitsigs/commitsigs.py
#+end_src

[1]: https://yhetil.org/guix-devel/878s6u2pco.fsf <at> trop.in/
[2]: https://lists.sr.ht/~abcdw/rde-devel/patches/22421

Xinglu Chen (2):
  gnu: Add mercurial-commitsigs.
  gnu: mercurial: Add PYTHONPATH to ‘native-search-paths’.

 gnu/packages/version-control.scm | 68 ++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)


base-commit: aa7eeabe9a782afc2535581298990050d16b1895
-- 
2.31.1

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