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environment: Add ‘--writable-root’ and default to read-only root.

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This is an incompatible change where the root file system in
‘guix shell -C’ is now read-only by default.

* guix/scripts/environment.scm (show-environment-options-help)
(%options): Add ‘--writable-root’.
* guix/scripts/environment.scm (setup-fhs): Invoke /sbin/ldconfig; moved
from…
(launch-environment): … here.
(launch-environment/container): Add #:writable-root? and pass it to
‘call-with-container’.  Move root file system setup to #:populate-file-system.
(guix-environment*): Honor ‘--writable-root’.
* tests/guix-environment-container.sh: Test it.
* doc/guix.texi (Invoking guix shell): Document ‘--writable-root’.
(Debugging Build Failures): Mention it before “rm /bin/sh”.

Change-Id: I2e8517d6f01eb8093160bffc0f9f56071ad6fee6
Reviewed-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
This commit is contained in:
Ludovic Courtès
2025-04-04 23:38:45 +02:00
parent 7d28e6512c
commit ce363c1dc7
3 changed files with 76 additions and 46 deletions
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11
tests/guix-environment-container.sh
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@@ -1,7 +1,7 @@
# GNU Guix --- Functional package management for GNU
# Copyright © 2015 David Thompson <davet@gnu.org>
# Copyright © 2022, 2023 John Kehayias <john.kehayias@protonmail.com>
# Copyright © 2023 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2023, 2025 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of GNU Guix.
#
@@ -186,6 +186,15 @@ HOME="$tmpdir" guix environment --bootstrap --container --user=foognu \
-- /bin/sh -c 'test $(pwd) == "/home/foo" -a ! -d '"$tmpdir"
)
# Check that the root file system is read-only by default...
guix environment --bootstrap --container --ad-hoc guile-bootstrap \
-- guile -c '(mkdir "/whatever")' && false
# ... and can be made writable.
guix environment --bootstrap --container --ad-hoc guile-bootstrap \
--writable-root \
-- guile -c '(mkdir "/whatever")'
# Check the exit code.
abnormal_exit_code="