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Use one of `get` or `getOr` instead which will either return a null-pointer (with a nicer error message) or a default value when the key is missing.
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Shell completion improvements
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There is a correctnes issue here, but #3724 will fix that. This is just
a cleanup for brevity's sake.
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libutil: Fix restoring mount namespace
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libutil: Reserve memory when en/decoding base64
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`string_view::find_first_not_of(...)` and
`string_view::find_first_of(...)` return `string_view::npos` on error
not `string::npos`.
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The size of the output when encoding to and decoding from base64 is
(roughly) known so we can allocate it in advance to prevent
reallocation.
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Saving the cwd fd didn't actually work well -- prior to this commit, the
following would happen:
: ~/w/vc/nix ; doas outputs/out/bin/nix --experimental-features 'nix-command flakes' run nixpkgs#coreutils -- --coreutils-prog=pwd
pwd: couldn't find directory entry in ‘../../../..’ with matching i-node
: ~/w/vc/nix ; doas outputs/out/bin/nix --experimental-features 'nix-command flakes' develop -c pwd
pwd: couldn't find directory entry in ‘../../../..’ with matching i-node
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This doesn't work very well (maybe I'm misunderstanding the desired
implementation):
: ~/w/vc/nix ; doas outputs/out/bin/nix --experimental-features 'nix-command flakes' develop -c pwd
pwd: couldn't find directory entry in ‘../../../..’ with matching i-node
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Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
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It's a GNU extension, as pointed out by pennae.
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Just in case making libutil depend on std::filesystem is unacceptable,
here is the non-filesystem approach.
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I regularly pass around simple scripts by using nix-shell as the script
interpreter, eg. like this:
#!/usr/bin/env nix-shell
#!nix-shell -p dd_rescue coreutils bash -i bash
While this works most of the time, I recently had one occasion where it
would not and the above would result in the following:
$ sudo ./myscript.sh
bash: ./myscript.sh: No such file or directory
Note the "sudo" here, because this error only occurs if we're root.
The reason for the latter is because running Nix as root means that we
can directly access the store, which makes sure we use a filesystem
namespace to make the store writable. XXX - REWORD!
So when stracing the process, I stumbled on the following sequence:
openat(AT_FDCWD, "/proc/self/ns/mnt", O_RDONLY) = 3
unshare(CLONE_NEWNS) = 0
... later ...
getcwd("/the/real/cwd", 4096) = 14
setns(3, CLONE_NEWNS) = 0
getcwd("/", 4096) = 2
In the whole strace output there are no calls to chdir() whatsoever, so
I decided to look into the kernel source to see what else could change
directories and found this[1]:
/* Update the pwd and root */
set_fs_pwd(fs, &root);
set_fs_root(fs, &root);
The set_fs_pwd() call is roughly equivalent to a chdir() syscall and
this is called when the setns() syscall is invoked[2].
[1]: https://github.com/torvalds/linux/blob/b14ffae378aa1db993e62b01392e70d1e585fb23/fs/namespace.c#L4659
[2]: https://github.com/torvalds/linux/blob/b14ffae378aa1db993e62b01392e70d1e585fb23/kernel/nsproxy.c#L346
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Before the change on a system with `auto-optimise-store = true`:
$ nix store gc --verbose --max 1
deleted all the paths instead of one path (we requested 1 byte limit).
It happens because every file in `auto-optimise-store = true` has at
least 2 links: file itself and a link in /nix/store/.links/ directory.
The change conservatively assumes that any file that has one (as before)
or two links (assume auto-potimise mode) will free space.
Co-authored-by: Sandro <sandro.jaeckel@gmail.com>
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no need for function<> with c++17 deduction. this saves allocations and virtual
calls, but has the same semantics otherwise. not going through function has the
side effect of giving compilers more insight into the cleanup code, so we need a
few local warning disables.
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Allows completing `nix build ~/flake#<Tab>`.
We can implement expansion for `~user` later if needed.
Not using wordexp(3) since that expands way too much.
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Allows completing `nix why-depends /run/cur<Tab>` to /run/current-system
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https://hydra.nixos.org/build/168594664
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GCC is not as good at music as it seems to think it is. Fixes #4546.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
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Also use std::string_view in a few more places.
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hercules-ci/issue-3294-fix-interruptCallback-deadlock
Fix deadlocked nix-daemon zombies on darwin #3294
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I noticed that occasional Ctrl-C leaves *.lock files around.
`nix-daemon`'s journal logs contained crashes like:
nix-daemon[30416]: terminate called after throwing an instance of 'nix::SysError'
nix-daemon[30416]: what(): error: writing to file: Broken pipe
And core dump backtraces pointed at `teriminate()` call from
destructors:
...
_Unwind_Resume ()
nix::ignoreException() ()
nix::LocalDerivationGoal::~LocalDerivationGoal()
...
void ignoreException()
{
try {
throw;
} catch (std::exception & e) {
printError("error (ignored): %1%", e.what());
}
}
The crashes happen when client side closes early and printError() throws
an IO error.
The change wraps `ignoreException()` into blanket `try { ... } catch (...) {}`.
Closes: https://github.com/NixOS/nix/issues/6046
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This changes the representation of the interrupt callback list to
be safe to use during interrupt handling.
Holding a lock while executing arbitrary functions is something to
avoid in general, because of the risk of deadlock.
Such a deadlock occurs in https://github.com/NixOS/nix/issues/3294
where ~CurlDownloader tries to deregister its interrupt callback.
This happens during what seems to be a triggerInterrupt() by the
daemon connection's MonitorFdHup thread. This bit I can not confirm
based on the stack trace though; it's based on reading the code,
so no absolute certainty, but a smoking gun nonetheless.
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Fixes #6017
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optimize primops and utils by caching more and copying less
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Remove shared strings
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These were needed back in the pre-C++11 era because we didn't have
move semantics. But now we do.
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improve parser performance a bit
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when given a string yacc will copy the entire input to a newly allocated
location so that it can add a second terminating NUL byte. since the
parser is a very internal thing to EvalState we can ensure that having
two terminating NUL bytes is always possible without copying, and have
the parser itself merely check that the expected NULs are present.
# before
Benchmark 1: nix search --offline nixpkgs hello
Time (mean ± σ): 572.4 ms ± 2.3 ms [User: 563.4 ms, System: 8.6 ms]
Range (min … max): 566.9 ms … 579.1 ms 50 runs
Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 381.7 ms ± 1.0 ms [User: 348.3 ms, System: 33.1 ms]
Range (min … max): 380.2 ms … 387.7 ms 50 runs
Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.936 s ± 0.005 s [User: 2.715 s, System: 0.221 s]
Range (min … max): 2.923 s … 2.946 s 50 runs
# after
Benchmark 1: nix search --offline nixpkgs hello
Time (mean ± σ): 571.7 ms ± 2.4 ms [User: 563.3 ms, System: 8.0 ms]
Range (min … max): 566.7 ms … 579.7 ms 50 runs
Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 376.6 ms ± 1.0 ms [User: 345.8 ms, System: 30.5 ms]
Range (min … max): 374.5 ms … 379.1 ms 50 runs
Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.922 s ± 0.006 s [User: 2.707 s, System: 0.215 s]
Range (min … max): 2.906 s … 2.934 s 50 runs
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there's a couple places that can be easily converted from using strings to using
string_views instead. gives a slight (~1%) boost to system eval.
# before
nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.946 s ± 0.026 s [User: 2.655 s, System: 0.209 s]
Range (min … max): 2.905 s … 2.995 s 20 runs
# after
Time (mean ± σ): 2.928 s ± 0.024 s [User: 2.638 s, System: 0.211 s]
Range (min … max): 2.893 s … 2.970 s 20 runs
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This was already accidentally disabled in ba87b08. It also no longer
appears to be beneficial, and in fact slow things down, e.g. when
evaluating a NixOS system configuration:
elapsed time: median = 3.8170 mean = 3.8202 stddev = 0.0195 min = 3.7894 max = 3.8600 [rejected, p=0.00000, Δ=0.36929±0.02513]
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On Docker (but not podman), unshare(CLONE_FS) fails with EPERM. So
let's ignore it and hope nothing bad happens.
Attempted fix for #5777.
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Fixes #5674.
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According to XDG Base Directory Specification,
it should fall back to /etc/xdg when the env var is not present.
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This prevents Nix from barfing when run in a container where it
doesn't have the appropriate privileges.
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Fixed a bug in initialization of 'base64DecodeChars' variable.
Currently decoder do not fail on invalid Base64 strings.
Added test-case to verify the fix.
Also have made 'base64DecodeChars' to be computed at compile time.
And added a test case to encode/decode string with non-printable charactes.
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