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container: Allow 'container-excursion' to the same namespaces.

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Before that, 'container-excursion' would call 'setns' even when the
target namespace is the one the caller is already in, which would fail.

* gnu/build/linux-container.scm (container-excursion): Introduce
'source' and 'target'.  Compare the result of 'readlink' on these
instead of comparing file descriptors to decide whether to call
'setns'.
* tests/containers.scm ("container-excursion, same namespace"): New test.
This commit is contained in:
Ludovic Courtès
2016-10-18 23:22:03 +02:00
parent 99df12cd19
commit 7fee5b5397
2 changed files with 20 additions and 9 deletions
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9
tests/containers.scm
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@@ -162,4 +162,13 @@
(waitpid pid)
(zero? result)))))))
(skip-if-unsupported)
(test-equal "container-excursion, same namespaces"
42
;; The parent and child are in the same namespaces. 'container-excursion'
;; should notice that and avoid calling 'setns' since that would fail.
(container-excursion (getpid)
(lambda ()
(primitive-exit 42))))
(test-end)