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Catch a few stray cargo fmt things.
author Paul Fisher <paul@pfish.zone>
date Wed, 30 Jul 2025 18:43:07 -0400
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1 # `libpam-sys-impls`: LibPAM library detection
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3 This crate detects what implementation of LibPAM should be used, as part of the build script, and exports that information to downstream crates.
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5 This is mostly a backend crate for [libpam-sys](https://crates.io/crates/libpam-sys/).
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6 That crate re-exports pretty much everything we provide.
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7 In most cases, you can just use that instead of depending upon this directly.
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9 ## Usage
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11 Different PAM implementations have different constants and some different behaviors.
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12 If you need to change your library's behavior based on PAM implementation, there are a few ways to do so.
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13
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14 ### Constants
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16 You can match on the current PAM implementation at runtime.
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17 All known PAM implementations are in the `PamImpl` enumeration, and `PamImpl::CURRENT` is set to the current implementation.
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18 This is present as a string literal macro in `pam_impl_name!`.
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20 ### Conditional compilation
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22 This package provides custom `#[cfg]`s to compile based on the current PAM implementation.
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24 First, **enable custom `#[cfg]`s in your build.rs**:
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26 ```rust
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27 // build.rs
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28 use libpam_sys_impls::pam_impl;
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30 fn main() {
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31 pam_impl::enable_pam_impl_cfg();
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32
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33 // everything else you do at build time
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34 }
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35 ```
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36
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37 This will then allow you to use the `pam_impl` configuration variable at compile time:
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39 ```rust
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40 #[cfg(pam_impl = "LinuxPam")]
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41 fn handle_pam() {
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42 // do things in a Linux-PAM specific way
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43 }
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45 #[cfg(not(pam_impl = "LinuxPam"))]
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46 fn handle_pam() {
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47 // do things in another, more different way
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48 }
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49 ```
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50
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51 ## Configuration
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53 Known implementations of PAM are listed in the `PamImpl` enum, and your currently installed implementation is automatically detected.
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55 If you need to configure this, you can override it **at build time** with the `LIBPAMSYS_IMPL` environment variable:
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57 - Unset or empty (the default): Use the version of PAM most commonly found on the target OS.
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58 If we don't know what kind of PAM is usually installed on this OS, we fall back to `__installed__`.
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59 - `__installed__`: Looks at the PAM library installed on the current machine.
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60 If none is recognized, falls back to `XSso`.
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61 - The name of a `PamImpl` entry: The named PAM implementation.
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62 For instance, `LIBPAMSYS_IMPL=OpenPam cargo build` will build this library for OpenPAM.
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64 ## MSRV
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66 This library supports **Rust 1.75**, as the version currently (July 2025) available in Debian Trixie and Ubuntu 24.04 LTS.