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libutil: Print stack trace on assertion failure

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This change overrides __assert_fail on glibc/musl
to instead call std::terminate that we have a custom
handler for. This ensures that we have more context
to diagnose issues encountered by users in the wild.
This commit is contained in:
Sergei Zimmerman 2025-10-11 01:30:21 +03:00
parent 2308aaf192
commit 46382ade74
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3 changed files with 51 additions and 0 deletions
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17
nix-meson-build-support/common/assert-fail/wrap-assert-fail.cc Normal file
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@ -0,0 +1,17 @@
#include "nix/util/error.hh"
#include <cstdio>
#include <cstdlib>
#include <cinttypes>
#include <string_view>
extern "C" [[noreturn]] void __attribute__((weak))
__wrap___assert_fail(const char * assertion, const char * file, unsigned int line, const char * function)
{
char buf[512];
int n =
snprintf(buf, sizeof(buf), "Assertion '%s' failed in %s at %s:%" PRIuLEAST32, assertion, function, file, line);
if (n < 0)
nix::panic("Assertion failed and could not format error message");
nix::panic(std::string_view(buf, std::min(static_cast<int>(sizeof(buf)), n)));
}