This is due to a change introduced with commit ce363c1dc7bd63a74dcf7788d340819f6d5db89f:

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commit ce363c1dc7bd63a74dcf7788d340819f6d5db89f
Author: Ludovic Courtès <[email protected]>

environment: Add ‘--writable-root’ and default to read-only root. This is an incompatible change where the root file system in
   ‘guix shell -C’ is now read-only by default.
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There have been follow-up commits, such as edc799dabfb059735f1a3084384925fe573d9de1 to make /tmp writable again:

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commit edc799dabfb059735f1a3084384925fe573d9de1
Author: Ludovic Courtès <[email protected]>

   environment, home: Make /tmp writable.
Fixes <https://issues.guix.gnu.org/78272>. Fixes a bug caused by commit ce363c1dc7bd63a74dcf7788d340819f6d5db89f,
   which inadvertently made /tmp read-only as well.
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The problem here is that the user's temporary home directory inside the container is now read-only by default, because it is a decendent of the read-only root directory:

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guix shell --container coreutils -- /bin/sh -c 'env > ~/.test'
/bin/sh: line 1: /home/rekado/.test: Read-only file system
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Is this intentional or should we add an exception to make the in-container home directory created for the user invoking "guix shell" writable for that same user?

--
Ricardo



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