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Fix NixOS detection #87187

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merged 1 commit into from
Jul 21, 2021
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Fix NixOS detection #87187

merged 1 commit into from
Jul 21, 2021

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oxalica
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@oxalica oxalica commented Jul 16, 2021 •
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Use /etc/os-release instead of /etc/NIXOS for detection.
The latter one does not exist on NixOS when using tmpfs as root.

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r? @Mark-Simulacrum

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 16, 2021
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nagisa commented Jul 16, 2021

r? @nagisa

Under what circumstances might /etc/NIXOS not exist? AFAICT from grepping around nixpkgs this file is ubiquitous.

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oxalica commented Jul 16, 2021

Under what circumstances might /etc/NIXOS not exist?

I mentioned it in the code comment. It doesn't exist if you are using tmpfs root (use auto population of /etc on every boot).
/etc/NIXOS is only created in installation script but not in activation script.

Generally I think /etc/os-release should be preferred to do "distro detection", and it's more extensible if we need special treatment for some other distro.

AFAICT from grepping around nixpkgs this file is ubiquitous.

Not many outside installation but do have some. 🤔 Maybe I should also send a PR to nixpkgs to make it always present.

@oxalica oxalica mentioned this pull request Jul 16, 2021
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nagisa commented Jul 17, 2021

I mentioned it in the code comment.

Cool, I missed that when quickly looking through the PR.

Would be great if this comment was moved to a commit message and/or the PR description. A code comment here is not particularly useful, I feel. There's no context to a person reading code (especially so the future) as to why the reference to /etc/NIXOS exists at all.

Generally I think /etc/os-release should be preferred to do "distro detection", and it's more extensible if we need special treatment for some other distro.

Sure, though I would argue that extensibility and generality is not really a concern here given that the following fixups are extremely NixOS specific.

r=me once the PR description and/or commit messages are adjusted to include information about tmpfs nixos activations not having this file.

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Fix NixOS detection
919a8a5 
Use `/etc/os-release` instead of `/etc/NIXOS`.
The latter one does not exist on NixOS when using tmpfs as root.
@oxalica oxalica force-pushed the fix-nixos-detect branch from a105754 to 919a8a5 Compare July 20, 2021 16:39
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oxalica commented Jul 20, 2021

@nagisa Fixed.

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nagisa commented Jul 20, 2021

@bors r+

Thanks!

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bors commented Jul 20, 2021

📌 Commit 919a8a5 has been approved by nagisa

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 20, 2021
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Jul 21, 2021
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Rollup merge of rust-lang#87187 - oxalica:fix-nixos-detect, r=nagisa
2cc7e85 
Fix NixOS detection

Use `/etc/os-release` instead of `/etc/NIXOS` for detection.
The latter one does not exist on NixOS when using tmpfs as root.
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bors commented Jul 21, 2021

⌛ Testing commit 919a8a5 with merge db06c87bbb4c488f3fcab9df58f0ccd11cb21f3a...

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bors commented Jul 21, 2021

💥 Test timed out

@bors bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 21, 2021
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nagisa commented Jul 21, 2021

@bors retry

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 21, 2021
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@GuillaumeGomez GuillaumeGomez mentioned this pull request Jul 21, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 21, 2021
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Auto merge of rust-lang#87347 - GuillaumeGomez:rollup-ke92xxc, r=Guil…
05f2326 
…laumeGomez

Rollup of 9 pull requests

Successful merges:

 - rust-lang#87187 (Fix NixOS detection)
 - rust-lang#87206 (avoid temporary vectors/reuse iterators)
 - rust-lang#87230 (Fix docblock <table> overflow)
 - rust-lang#87273 (Recognize bounds on impls as const bounds)
 - rust-lang#87279 (Add comments explaining the unix command-line argument support.)
 - rust-lang#87301 (Fix typo in compile.rs)
 - rust-lang#87311 (Get back the more precise suggestion spans of old regionck)
 - rust-lang#87321 (Add long explanation for E0722)
 - rust-lang#87342 (Add long explanation for E0757)

Failed merges:

 - rust-lang#87270 (Don't display <table> in item summary)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 2861265 into rust-lang:master Jul 21, 2021
@rustbot rustbot added this to the 1.55.0 milestone Jul 21, 2021
@oxalica oxalica deleted the fix-nixos-detect branch July 21, 2021 17:38
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