cli: fix genpolicy crash on Darwin #2133
Open
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/dev/stdin is passed to genpolicy when called from contrast cli
as a way to both a) silence genpolicy from outputting to stdout and
b) retrieve genpolicy's output back through stdin. This causes
a crash on Darwin like so:
time=2026-01-21T11:56:10.495+02:00 level=DEBUG msg="called `Result::unwrap()`
on an `Err` value: Os { code: 13, kind: PermissionDenied, message: \"Permission denied\" }"
This is due to architectural differences between Linux and Darwin
when attempting to write to /dev/stdin when passed via a pipe.
Minimal reproducer to run on Darwin and Linux:
echo "test" | python3 -c 'open("/dev/stdin", "w")'
Signed-off-by: Spyros Seimenis <sse@edgeless.systems>
burgerdev
reviewed
Jan 26, 2026
Member
burgerdev
left a comment
burgerdev
left a comment
There was a problem hiding this comment.
Did you have a chance to consider my comment on the original PR?
disable yaml output when --base64-out or --raw-out are present, because outputting both (or all 3) does not make any sense.
I'd say this has a good chance of being accepted upstream.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
/dev/stdin is passed to genpolicy when called from contrast cli as a way to both a) silence genpolicy from outputting to stdout and b) retrieve genpolicy's output back through stdin. This causes a crash on Darwin like so:
time=2026-01-21T11:56:10.495+02:00 level=DEBUG msg="called
Result::unwrap()on anErrvalue: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }"This is due to architectural differences between Linux and Darwin when attempting to write to /dev/stdin when passed via a pipe. Minimal reproducer to run on Darwin and Linux:
echo "test" | python3 -c 'open("/dev/stdin", "w")'