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annotate libpam-sys/libpam-sys-impls/build.rs @ 108:e97534be35e3

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Make some proc macros for doing cfg-like stuff for PAM impls.
author Paul Fisher <paul@pfish.zone>
date Sat, 28 Jun 2025 00:34:45 -0400
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children bb465393621f
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108
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
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1 use strum::EnumString;
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2
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3 fn main() {
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4 let pam_impl = match option_env!("LIBPAMSYS_IMPL") {
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5 // The default option: Guess what PAM impl we're using based on OS.
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6 None => {
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7 // Otherwise, guess what PAM impl we're using based on the OS.
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8 if cfg!(target_os = "linux") {
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9 PamImpl::LinuxPam
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10 } else if cfg!(any(
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11 target_os = "macos",
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12 target_os = "freebsd",
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13 target_os = "netbsd",
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14 target_os = "dragonfly",
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15 target_os = "openbsd"
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16 )) {
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17 PamImpl::OpenPam
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18 } else if cfg!(any()) {
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19 PamImpl::Illumos
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20 } else {
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21 PamImpl::MinimalOpenPam
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22 }
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23 }
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24 Some("_detect") => {
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25 // Detect which impl it is from system headers.
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26 if header_exists("security/_pam_types.h") {
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27 PamImpl::LinuxPam
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28 } else if header_exists("security/openpam.h") {
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29 PamImpl::OpenPam
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30 } else if header_exists("security/pam_appl.h") {
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31 // We figure we're *probably* on Illumos or something like that.
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32 PamImpl::Illumos
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33 } else {
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34 // If all else fails, assume the bare minimum.
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35 PamImpl::MinimalOpenPam
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36 }
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37 }
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38 Some(other) => match PamImpl::try_from(other) {
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39 Ok(i) => i,
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40 Err(_) => panic!("unknown PAM implementation {other:?}")
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41 }
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42 };
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43 println!("cargo:rustc-env=LIBPAMSYS_IMPL={pam_impl:?}");
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44 }
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45
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46 #[derive(Debug, EnumString)]
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47 enum PamImpl {
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48 Illumos,
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49 LinuxPam,
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50 OpenPam,
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51 MinimalOpenPam,
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52 }
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53
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54 fn header_exists(header: &str) -> bool {
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55 bindgen::Builder::default()
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56 .blocklist_item(".*")
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57 .header_contents("header.h", &format!("#include <{header}>"))
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58 .generate()
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59 .is_ok()
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60 }