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annotate libpam-sys/libpam-sys-consts/README.md @ 148:4b3a5095f68c

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Move libpam-sys helpers into their own library. - Renames libpam-sys-helpers to libpam-sys-consts. - Moves libpam-sys-helpers::helpers into libpam-sys-helpers, which moves them completely out of libpam-sys's dependency chain. - Moves the aliases from libpam-sys into libpam-sys::aliases.
author Paul Fisher <paul@pfish.zone>
date Mon, 07 Jul 2025 12:11:43 -0400
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1 # `libpam-sys-consts`: Constants for LibPAM
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2
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3 This crate does two primary things:
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4
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5 - Detects which implementation of LibPAM the current machine uses (as part of the build script), and exports that information to downstream crates.
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6 - Exports the constants specific to that version of LibPAM.
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7 These are located in the `constants` module.
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8
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9 ## Handling different PAM implmementations
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10
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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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15
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16 The current PAM implementation is available in `PamImpl::CURRENT`.
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17 This is present as a string literal macro in `pam_impl_name!`.
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18
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19 ### Conditional compilation
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20
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21 This package provides custom `#[cfg]`s to compile based on the current PAM implementation.
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22
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23 First, **enable custom `#[cfg]`s in your build.rs**:
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24
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25 ```rust
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26 // build.rs
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27 use libpam_sys_helpers::pam_impl;
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28
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29 fn main() {
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30 pam_impl::enable_pam_impl_cfg();
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31
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32 // everything else you do at build time
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33 }
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34 ```
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35
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36 This will then allow you to use the `pam_impl` configuration variable at compile time:
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37
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38 ```rust
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39 #[cfg(pam_impl = "LinuxPam")]
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40 fn handle_pam() {
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41 // do things in a Linux-PAM specific way
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42 }
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43
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44 #[cfg(not(pam_impl = "LinuxPam"))]
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45 fn handle_pam() {
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46 // do things in another, more different way
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47 }
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48 ```
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49
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50 ## Configuration
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51
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52 By default, this crate automatically detects your libpam version.
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53 Known implementations are listed in the `PamImpl` enum.
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54
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55 You can override this **at build time** by setting the `LIBPAMSYS_IMPL` environment variable to one of those names.
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56 For example, `LIBPAMSYS_IMPL=OpenPam cargo build` will build this library for OpenPAM.
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57
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58 ## MSRV
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59
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60 This library supports **Rust 1.75**, as the version currently (July 2025) available in Debian Trixie and Ubuntu 24.04 LTS.