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uucore: safe_traversal is not built on AIX and Hurd #15028
Description
safe_traversal (and so the descriptor-based -R walks in chmod, chown, chgrp, du, install and rm) is gated off AIX and Hurd, which fall back to path-based walks. nix has every call it needs on both; the only build failure is the stat time fields, which they expose as st_atim/st_mtim/st_ctim timespecs.
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xtqqczze commentedon Oct 2, 2026
Apparently, we can build on Redox too:
abendrothj commentedon Oct 2, 2026
That passes because safe_traversal is still cfg'd out on Redox, so it isn't compiled. With the Redox exclusion removed, the same command fails: nix has none of the *at calls there (no
nix::dir,openat,fstatat,fchownat,unlinkat,mkdiratorAtFlags), and uu_chown additionally hits the missingrustix::fs::symlinkatin uucore's fs feature, as on main. Supporting Redox would mean rewritingDirFdon raw libc, so I've left it out of this one.