On macOS, poll() is fundamentally broken for HUP detection. It loses event
subscriptions when EVFILT_READ fires without matching the requested events
in the pollfd. This causes daemon processes to linger after client disconnect.
This commit replaces poll() with kqueue on macOS, which is what poll()
uses internally but without the bugs. The kqueue implementation uses
EVFILT_READ which works for both sockets and pipes, avoiding EVFILT_SOCK
which only works for sockets.
On Linux and other platforms, we continue using poll() with the standard
POSIX behavior where POLLHUP is always reported regardless of requested events.
Based on work from the Lix project (https://git.lix.systems/lix-project/lix)
commit 69ba3c92db3ecca468bcd5ff7849fa8e8e0fc6c0
Fixes: https://github.com/NixOS/nix/issues/13847
Related: https://git.lix.systems/lix-project/lix/issues/729
Apple bugs: rdar://37537852 (poll), FB17447257 (poll)
Co-authored-by: Jade Lovelace <jadel@mercury.com>
(cherry picked from commit 1286d5db78)
This would print erroneous and misleading diagnostics like:
> error (ignored): error: '--arg' and '--argstr' are incompatible with flakes
When run with --expr/--file. Since this installable is used to get the
bash package it doesn't make sense to check this.
(cherry picked from commit b6f98b52a4)
• Updated input 'nixpkgs':
'github:NixOS/nixpkgs/cd32a774ac52caaa03bcfc9e7591ac8c18617ced?narHash=sha256-VtMQg02B3kt1oejwwrGn50U9Xbjgzfbb5TV5Wtx8dKI%3D' (2025-08-17)
→ 'github:NixOS/nixpkgs/d98ce345cdab58477ca61855540999c86577d19d?narHash=sha256-O2CIn7HjZwEGqBrwu9EU76zlmA5dbmna7jL1XUmAId8%3D' (2025-08-26)
This update contains d1266642a8722f2a05e311fa151c1413d2b9653c, which
is necessary for the TOML timestamps to get tested via nixpkgsLibTests job.
(cherry picked from commit 625477a7df)
This addresses several changes from toml11 4.0 bump in
nixpkgs [1].
1. Added more regression tests for timestamp formats.
Special attention needs to be paid to the precision
of the subsecond range for local-time. Prior versions select the closest
(upwards) multiple of 3 with a hard cap of 9 digits.
2. Normalize local datetime and offset datetime to always
use the uppercase separator `T`. This is actually the issue
surfaced in [2]. This canonicalization is basically a requirement
by (a certain reading) of rfc3339 section 5.6 [3].
3. If using toml11 >= 4.0 also keep the old behavior wrt
to the number of digits used for subsecond part of the local-time.
Newer versions cap it at 6 digits unconditionally.
[1]: https://www.github.com/NixOS/nixpkgs/pull/331649
[2]: https://www.github.com/NixOS/nix/issues/11441
[3]: https://datatracker.ietf.org/doc/html/rfc3339
(cherry picked from commit dc769d72cb)
Current test suite doesn't cover the subsecond formatting at
all and toml11 is quite finicky with that. We should at the very
least test its behavior to avoid silent breakages on updates.
(cherry picked from commit 7ed0229d1a)
About time we upgraded our nixpkgs flake input. Ideally
we'd have automation to do this.
Flake lock file updates:
• Updated input 'nixpkgs':
'github:NixOS/nixpkgs/adaa24fbf46737f3f1b5497bf64bae750f82942e?narHash=sha256-qhFMmDkeJX9KJwr5H32f1r7Prs7XbQWtO0h3V0a0rFY%3D' (2025-05-13)
→ 'github:NixOS/nixpkgs/cd32a774ac52caaa03bcfc9e7591ac8c18617ced?narHash=sha256-VtMQg02B3kt1oejwwrGn50U9Xbjgzfbb5TV5Wtx8dKI%3D' (2025-08-17)
(cherry picked from commit fc33681583)
Prior patches in 54dc5314e8
and 6db6190002 fixed the default
system double for i686 and ppc/ppc64. This also patch also covers
32 bit arm and mips. ARM cpu names are taken from host_machine.cpu()
for a lack of a better option, but host_machine.cpu_family() is
preferred, since that is supposed to be somewhat standard for cross
files. Endianness is handled correctly by looking at host_machine.endian().
This also updates the documentation to be up to date to how system cpu
is translated from the host_machine specification.
(cherry picked from commit 60d124b36e)
CI on release branches should be stable, otherwise backporting
might become flaky and unreliable. Dogfooding only really makes
sense for CI on master branch, where failures are not as tedious
to work around.
I've missed this while reviewing 6db6190002.
I only built big endian ppc64, so that didn't occur to me.
From meson manual:
> Those porting from autotools should note that Meson does not add
> endianness to the name of the cpu_family. For example, autotools will
> call little endian PPC64 "ppc64le", Meson will not, you must also check
> the .endian() value of the machine for this information.
This code should handle that correctly.
(cherry picked from commit ebd311b7b7)
* It is tough to contribute to a project that doesn't use a formatter,
* It is extra hard to contribute to a project which has configured the formatter, but ignores it for some files
* Code formatting makes it harder to hide obscure / weird bugs by accident or on purpose,
Let's rip the bandaid off?
Note that PRs currently in flight should be able to be merged relatively easily by applying `clang-format` to their tip prior to merge.
Co-authored-by: Graham Christensen <graham@grahamc.com>
Previously, `nix help shell` failed with "Nix has no subcommand 'shell'" despite `nix shell --help`
working correctly. This happened because the `shell` command is actually an alias for `env shell`,
and the help system wasn't resolving aliases when looking up documentation.
This patch modifies the `showHelp` function to check for and resolve aliases before generating the
manpage name, ensuring that shorthand commands like `shell` get proper help documentation.
Closes: #13431
(cherry picked from commit d678b071d6)
