bug#52139: jupyter trying to modify /gnu/store

[Lars-Dominik Braun <lars@6xq.net>]

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Hi Ludo,

> But precisely: as Alexander wrote, when JUPYTER_CONFIG_DIR points to the
> store, jupyterlab cannot drop a config file there.  Or am I missing
> something?
sorry, my message was unclear here. The config file is written at
build time.

> BTW, if JUPYTER_CONFIG_DIR is meant to contain a directory name, as
> opposed to a colon-separated search path, we should make this change:
Looking at the documentation[1] again this is correct, but I feel we
should use JUPYTER_CONFIG_PATH instead, because it supports
colon-delimited entries, see attached patch. However that does not get
rid of error messages like these, when trying to use Settings→JupyterLab
Theme for example:

[W 08:10:14.476 LabApp] 500 PUT /lab/api/workspaces/lab?1639383014500 (127.0.0.1): [Errno 30] Read-only file system: '/gnu/store/8q7wdpdddfqh46plbbsa3rwci5092n5y-profile/etc/jupyter/lab'

So it seems that JUPYTER_CONFIG_PATH overrides the default
JUPYTER_CONFIG_DIR, when the latter is not set. Or maybe guix-science’s
jupyterlab is simply too old – not sure right now.

Cheers,
Lars

[1] https://jupyter.readthedocs.io/en/latest/use/jupyter-directories.html

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diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index db2ab8e5f0..450d17208f 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -8478,7 +8478,7 @@ (define-public python-jupyter-core
     ;; search paths.
     (native-search-paths
      (list (search-path-specification
-            (variable "JUPYTER_CONFIG_DIR")
+            (variable "JUPYTER_CONFIG_PATH")
             (files '("etc/jupyter")))
            (search-path-specification
             (variable "JUPYTER_PATH")
@@ -12145,8 +12145,6 @@ (define-public python-nbconvert
              (when tests?
                ;; Some tests invoke the installed nbconvert binary.
                (add-installed-pythonpath inputs outputs)
-               ;; Tries to write to this path.
-               (unsetenv "JUPYTER_CONFIG_DIR")
                ;; Tests depend on templates installed to output.
                (setenv "JUPYTER_PATH"
                        (string-append
@@ -12254,6 +12252,8 @@ (define-public python-notebook
                ;; Some tests do not expect all files to be installed in the
                ;; same directory, but JUPYTER_PATH contains multiple entries.
                (unsetenv "JUPYTER_PATH")
+               ;; Interferes with tests that check paths.
+               (unsetenv "JUPYTER_CONFIG_PATH")
                ;; Some tests need HOME
                (setenv "HOME" "/tmp")
                (with-directory-excursion "/tmp"