Your message dated Mon, 3 Feb 2025 21:26:04 +0100 with message-id <[email protected]> and subject line closed as invalid upstream has caused the Debian Bug report #1094270, regarding std::filesystem::weakly_canonical throws if the file disappears during its execution to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 1094270: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1094270 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: libstdc++-14-dev Version: 14.2.0-12 Severity: normal Hello, thank you for maintaining libstdc++. The function std::filesystem::weakly_canonical is defined as working even if the path points to a file that does not exist. If however the path disappears while weakly_canonical does its thing, we surprisingly get an exception. I'm attaching a reproducer: $ g++ weakly_canonical.cc -o weakly_canonical $ ./weakly_canonical Canonicalized path for missing file: "…/tmp/does-not-exist" weakly_canonical failed at iteration 36: filesystem error: cannot make canonical path: No such file or directory [tmp/test] Enrico -- System Information: Debian Release: trixie/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 6.12.6-amd64 (SMP w/16 CPU threads; PREEMPT) Kernel taint flags: TAINT_WARN Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), LANGUAGE=en_IE:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages libstdc++-14-dev depends on: ii gcc-14-base 14.2.0-12 ii libc6-dev 2.40-5 ii libgcc-14-dev 14.2.0-12 ii libstdc++6 14.2.0-12 libstdc++-14-dev recommends no packages. Versions of packages libstdc++-14-dev suggests: pn libstdc++-14-doc <none> -- no debconf information#include <filesystem> #include <thread> #include <iostream> std::filesystem::path workdir("tmp"); auto oddpath = workdir / "test"; bool done = false; void glitch() { while (! done) { std::filesystem::remove(oddpath); std::filesystem::create_directory(oddpath); } } void canonical() { unsigned iteration = 0; try { while (true) { ++iteration; (void)std::filesystem::weakly_canonical(oddpath); } } catch (std::exception& e) { done = true; std::cerr << "weakly_canonical failed at iteration " << iteration << ": " << e.what() << std::endl; } } int main(int argc, const char* argv[]) { std::filesystem::create_directory(workdir); auto missing = std::filesystem::weakly_canonical(workdir / "does-not-exist"); std::cerr << "Canonicalized path for missing file: " << missing << std::endl; std::thread glitcher(glitch); canonical(); glitcher.join(); std::filesystem::remove_all(workdir); return 0; }
--- End Message ---
--- Begin Message ---closed as invalid upstream
--- End Message ---
