libutil: Assorted collection of fixes, address UBSan failure in AutoDelete#15172
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libutil: Assorted collection of fixes, address UBSan failure in AutoDelete#15172
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Ericson2314
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Feb 7, 2026
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Of course CI needs to be fixed, but conceptually things look good
Diagnosed by UBSan in hydra [1]: SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /nix/store/m1k4nxs8r0fl0pjxqp5n37vxgms7gdlb-gcc-14.3.0/include/c++/14.3.0/bits/move.h:234:11 in +(prefetch.sh:6) path= ++(prefetch.sh:6) onError ++(/build/source/tests/functional/common/functions.sh:241) set +x prefetch.sh: test failed at: main in prefetch.sh:6 [1]: https://hydra.nixos.org/build/321098757/nixlog/1
More correctly describes the error, since we are always reading a relative path.
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Motivation
See individual commits for details. Fixes https://hydra.nixos.org/build/321098757/nixlog/1.
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