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annotate rust/hgcli/build.rs @ 44304:dbbae122f5e4

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manifest: remove optional default= argument on flags(path) It had only one caller inside manifest.py, and treemanifest was actually incorrectly implemented. treemanifest is still missing the fastdelta() method from the interface (and so doesn't yet conform), but this is at least progress. Differential Revision: https://phab.mercurial-scm.org/D8069
author Augie Fackler <augie@google.com>
date Mon, 03 Feb 2020 22:16:36 -0500
parents ce088b38f92b
children 26ce8e751503
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // build.rs -- Configure build environment for `hgcli` Rust package.
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2 //
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3 // Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use std::collections::HashMap;
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9 use std::env;
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10 use std::path::Path;
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11 use std::process::Command;
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12
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13 struct PythonConfig {
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14 python: String,
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15 config: HashMap<String, String>,
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16 }
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17
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18 fn get_python_config() -> PythonConfig {
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19 // The python27-sys crate exports a Cargo variable defining the full
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20 // path to the interpreter being used.
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21 let python = env::var("DEP_PYTHON27_PYTHON_INTERPRETER")
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22 .expect("Missing DEP_PYTHON27_PYTHON_INTERPRETER; bad python27-sys crate?");
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23
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24 if !Path::new(&python).exists() {
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25 panic!(
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26 "Python interpreter {} does not exist; this should never happen",
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27 python
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28 );
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29 }
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30
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31 // This is a bit hacky but it gets the job done.
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32 let separator = "SEPARATOR STRING";
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33
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34 let script = "import sysconfig; \
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35 c = sysconfig.get_config_vars(); \
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36 print('SEPARATOR STRING'.join('%s=%s' % i for i in c.items()))";
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37
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38 let mut command = Command::new(&python);
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39 command.arg("-c").arg(script);
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40
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41 let out = command.output().unwrap();
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42
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43 if !out.status.success() {
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44 panic!(
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45 "python script failed: {}",
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46 String::from_utf8_lossy(&out.stderr)
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47 );
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48 }
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49
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50 let stdout = String::from_utf8_lossy(&out.stdout);
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51 let mut m = HashMap::new();
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52
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53 for entry in stdout.split(separator) {
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54 let mut parts = entry.splitn(2, "=");
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55 let key = parts.next().unwrap();
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56 let value = parts.next().unwrap();
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57 m.insert(String::from(key), String::from(value));
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58 }
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59
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60 PythonConfig {
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61 python: python,
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62 config: m,
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63 }
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64 }
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65
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66 #[cfg(not(target_os = "windows"))]
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67 fn have_shared(config: &PythonConfig) -> bool {
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68 match config.config.get("Py_ENABLE_SHARED") {
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69 Some(value) => value == "1",
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70 None => false,
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71 }
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72 }
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73
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74 #[cfg(target_os = "windows")]
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75 fn have_shared(config: &PythonConfig) -> bool {
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76 use std::path::PathBuf;
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77
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78 // python27.dll should exist next to python2.7.exe.
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79 let mut dll = PathBuf::from(&config.python);
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80 dll.pop();
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81 dll.push("python27.dll");
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82
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83 return dll.exists();
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84 }
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85
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86 const REQUIRED_CONFIG_FLAGS: [&str; 2] = ["Py_USING_UNICODE", "WITH_THREAD"];
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87
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88 fn main() {
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89 let config = get_python_config();
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90
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91 println!("Using Python: {}", config.python);
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92 println!("cargo:rustc-env=PYTHON_INTERPRETER={}", config.python);
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93
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94 let prefix = config.config.get("prefix").unwrap();
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95
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96 println!("Prefix: {}", prefix);
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97
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98 // TODO Windows builds don't expose these config flags. Figure out another
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99 // way.
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100 #[cfg(not(target_os = "windows"))]
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101 for key in REQUIRED_CONFIG_FLAGS.iter() {
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102 let result = match config.config.get(*key) {
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103 Some(value) => value == "1",
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104 None => false,
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105 };
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106
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107 if !result {
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108 panic!("Detected Python requires feature {}", key);
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109 }
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110 }
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111
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112 // We need a Python shared library.
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113 if !have_shared(&config) {
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114 panic!("Detected Python lacks a shared library, which is required");
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115 }
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116
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117 let ucs4 = match config.config.get("Py_UNICODE_SIZE") {
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118 Some(value) => value == "4",
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119 None => false,
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120 };
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121
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122 if !ucs4 {
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123 #[cfg(not(target_os = "windows"))]
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124 panic!("Detected Python doesn't support UCS-4 code points");
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125 }
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126 }