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fix: segfault in positional arg completion

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Adding the inputPath as a positional feature uncovered this bug.
As positional argument forms were discarded from the `expectedArgs`
list, their closures were not. When the `.completer` closure was then
called, part of the surrounding object did not exist anymore.

This didn't cause an issue before, but with the new call to
`getEvalState()` in the "inputs" completer in nix/flake.cc, a segfault
was triggered reproducibly on invalid memory access to the `this`
pointer, which was always 0.

The solution of splicing the argument forms into a new list to extend
their lifetime is a bit of a hack, but I was unable to get the "nicer"
iterator-based solution to work.
This commit is contained in:
Felix Uhl 2023-10-24 22:22:05 +02:00 • committed by Théophane Hufschmitt
parent c7dcdb8325
commit f282ef5a56
3 changed files with 29 additions and 2 deletions
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4
tests/functional/completions.sh
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@ -44,6 +44,10 @@ EOF
# Input override completion
[[ "$(NIX_GET_COMPLETIONS=4 nix build ./foo --override-input '')" == $'normal\na\t' ]]
[[ "$(NIX_GET_COMPLETIONS=5 nix flake show ./foo --override-input '')" == $'normal\na\t' ]]
cd ./foo
[[ "$(NIX_GET_COMPLETIONS=3 nix flake update '')" == $'normal\na\t' ]]
cd ..
[[ "$(NIX_GET_COMPLETIONS=5 nix flake update --flake './foo' '')" == $'normal\na\t' ]]
## With multiple input flakes
[[ "$(NIX_GET_COMPLETIONS=5 nix build ./foo ./bar --override-input '')" == $'normal\na\t\nb\t' ]]
## With tilde expansion