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85889266b1
...most notably we now produce fully static binaries in an alpine
image.
A few assorted thoughts:
* I really like static binaries, ideally I'd like to run EggsFS
deployments with just systemd scripts and a few binaries.
* Go already does this, which is great.
* C++ does not, which is less great.
* Linking statically against `glibc` works, but is unsupported.
Not only stuff like NSS (which `gethostbyname` requires)
straight up does not work, unless you build `glibc` with
unsupported and currently apparently broken flags
(`--enable-static-nss`), but also other stuff is subtly
broken (I couldn't remember exactly what was broken,
but see comments such as
<https://github.com/haskell/haskell-language-server/issues/2431#issuecomment-985880838>).
* So we're left with alternative libcs -- the most popular being
musl.
* The simplest way to build a C++ application using musl is to just
build on a system where musl is already the default libc -- such
as alpine linux.
The backtrace support is in a bit of a bad state. Exception stacktraces
work on musl, but DWARF seems to be broken on the normal release build.
Moreover, libunwind doesn't play well with musl's signal handler:
<https://maskray.me/blog/2022-04-10-unwinding-through-signal-handler>.
Keeping it working seems to be a bit of a chore, and I'm going to revisit
it later.
In the meantime, gdb stack traces do work fine.
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
// #include <bits/types/struct_timespec.h>
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#include <cstdio>
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#include <time.h>
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#include "Exception.hpp"
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#include "Time.hpp"
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#include "Assert.hpp"
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std::ostream& operator<<(std::ostream& out, Duration d) {
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if (d.ns < 1'000) {
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out << d.ns << "ns";
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} else if (d.ns < 1'000'000) {
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out << d.ns/1'000 << "." << d.ns%1'000 << "us";
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} else if (d.ns < 1'000'000'000) {
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out << d.ns/1'000'000 << "." << d.ns%1'000'000 << "ms";
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} else if (d.ns < 1'000'000'000ull*60) {
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out << d.ns/1'000'000'000 << "." << d.ns%1'000'000'000 << "s";
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} else if (d.ns < 1'000'000'000ull*60*60) {
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out << d.ns/(1'000'000'000ull*60) << "." << d.ns%(1'000'000'000ull*60) << "m";
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} else {
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out << d.ns/(1'000'000'000ull*60*60) << "." << d.ns%(1'000'000'000ull*60*60) << "h";
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}
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return out;
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}
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EggsTime eggsNow() {
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struct timespec now;
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if (clock_gettime(CLOCK_REALTIME, &now) != 0) {
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throw SYSCALL_EXCEPTION("clock_gettime");
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}
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return EggsTime(((uint64_t)now.tv_nsec + ((uint64_t)now.tv_sec * 1'000'000'000ull)) - EGGS_EPOCH);
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}
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std::ostream& operator<<(std::ostream& out, EggsTime eggst) {
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time_t secs = (EGGS_EPOCH + eggst.ns) / 1'000'000'000ull;
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uint64_t nsecs = eggst.ns % 1'000'000'00ull;
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struct tm tm;
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if (gmtime_r(&secs, &tm) == nullptr) {
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throw SYSCALL_EXCEPTION("gmtime_r");
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}
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// "2006-01-02T15:04:05.999999999"
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char buf[31];
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ALWAYS_ASSERT(strftime(buf, 29, "%Y-%m-%dT%H:%M:%S.", &tm) == 20);
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ALWAYS_ASSERT(snprintf(buf+20, 10, "%09lu", nsecs) == 9);
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buf[30] = '\0';
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out << buf;
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return out;
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} |