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Replace the !cmd macros #18

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zimbatm opened this issue Jan 26, 2021 · 2 comments
Closed

Replace the !cmd macros #18

zimbatm opened this issue Jan 26, 2021 · 2 comments

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@zimbatm
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zimbatm commented Jan 26, 2021

I'm suspicious of things like cmd!("{cmd_arg} {arg...} {path}"). They are probably invoking /bin/sh -c "{cmd_arg} {arg...} {path}" under the hood instead of execve(cmd_arg, arg..., path). This might cause some escaping issues if any of the argument contains a whitespace in them.
@Rizary
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Rizary commented Jan 27, 2021

I have talked to matklad, and he said he doesn't invoke /bin/sh -c.

@zimbatm
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zimbatm commented Jan 27, 2021

I did an strace and can confirm that it invokes execve() as expected. Matklad is the best.

@zimbatm zimbatm closed this as completed Jan 27, 2021
brianmcgee added a commit that referenced this issue May 13, 2024
@brianmcgee
fix: stalling on large file sets (#18)
55ca446 
When running against nixpkgs we were stalling. This was due to a long running read tx which was preventing any writes.

This breaks up reading the cache when walking the filesystem into many smaller read txs.

On my laptop I'm now getting the following with the echo sample:

```console
# fresh cache

❯ nix run .# -- -c --config-file ./test/echo.toml --tree-root ../../../github.com/nixos/nixpkgs
38825 files changed in 320.655826ms

# hot cache

❯ nix run .# -- --config-file ./test/echo.toml --tree-root ../../../github.com/nixos/nixpkgs
0 files changed in 252.920853ms%
```

Signed-off-by: Brian McGee <[email protected]>

Reviewed-on: https://git.numtide.com/numtide/treefmt/pulls/18
Reviewed-by: Jonas Chevalier <[email protected]>
Co-authored-by: Brian McGee <[email protected]>
Co-committed-by: Brian McGee <[email protected]>
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@zimbatm @Rizary