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comparison 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
2
3 This crate does two primary things:
4
5 - Detects which implementation of LibPAM the current machine uses (as part of the build script), and exports that information to downstream crates.
6 - Exports the constants specific to that version of LibPAM.
7 These are located in the `constants` module.
8
9 ## Handling different PAM implmementations
10
11 Different PAM implementations have different constants and some different behaviors.
12 If you need to change your library's behavior based on PAM implementation, there are a few ways to do so.
13
14 ### Constants
15
16 The current PAM implementation is available in `PamImpl::CURRENT`.
17 This is present as a string literal macro in `pam_impl_name!`.
18
19 ### Conditional compilation
20
21 This package provides custom `#[cfg]`s to compile based on the current PAM implementation.
22
23 First, **enable custom `#[cfg]`s in your build.rs**:
24
25 ```rust
26 // build.rs
27 use libpam_sys_helpers::pam_impl;
28
29 fn main() {
30 pam_impl::enable_pam_impl_cfg();
31
32 // everything else you do at build time
33 }
34 ```
35
36 This will then allow you to use the `pam_impl` configuration variable at compile time:
37
38 ```rust
39 #[cfg(pam_impl = "LinuxPam")]
40 fn handle_pam() {
41 // do things in a Linux-PAM specific way
42 }
43
44 #[cfg(not(pam_impl = "LinuxPam"))]
45 fn handle_pam() {
46 // do things in another, more different way
47 }
48 ```
49
50 ## Configuration
51
52 By default, this crate automatically detects your libpam version.
53 Known implementations are listed in the `PamImpl` enum.
54
55 You can override this **at build time** by setting the `LIBPAMSYS_IMPL` environment variable to one of those names.
56 For example, `LIBPAMSYS_IMPL=OpenPam cargo build` will build this library for OpenPAM.
57
58 ## MSRV
59
60 This library supports **Rust 1.75**, as the version currently (July 2025) available in Debian Trixie and Ubuntu 24.04 LTS.