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865cb0188c
Fixes a regression introduced in 7173c2c0ca. Additional discussion at
https://codeberg.org/guix/guix/pulls/5977.
* nix/libutil/util.cc (_deletePathAt): chmod directory and retry open when it
fails with EACCES. Do this using an O_PATH file descriptor referenced via
/proc/self/fd whenever possible to avoid it being replaced by a
non-directory immediately before being chmod'ed.
* nix/libutil/util.hh (deletePath): document TOCTTOU race on non-linux systems
where hardlinks aren't protected.
* tests/derivations.scm ("unreadable directories in build tree can be
removed"): new test.
Fixes: guix/guix#5891
Reported-by: Liliana Marie Prikler <liliana.prikler@gmail.com>
Change-Id: I749127fe5254ebabc8387a2f0ef47e3c116bfcc5
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Merges: #6460