feat: add support for locally installed headers

Some linux distros allow headers to be installed through
tools like rpm. If the runtime sets
process.config.variables.use_prefix_to_find_headers, look
for matching headers based on the directory set for the
prefix in process.config.variables.prefix

Signed-off-by: Michael Dawson <midawson@redhat.com>

lib/configure.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const { promises: fs } = require('graceful-fs')
+const fsSync = require('graceful-fs')
 const path = require('path')
 const log = require('./log')
 const os = require('os')
@@ -13,6 +14,10 @@ const { findAccessibleSync } = require('./util')
 const { findPython } = require('./find-python')
 const { findVisualStudio } = win ? require('./find-visualstudio') : {}
 
+const majorRe = /^#define NODE_MAJOR_VERSION (\d+)/m
+const minorRe = /^#define NODE_MINOR_VERSION (\d+)/m
+const patchRe = /^#define NODE_PATCH_VERSION (\d+)/m
+
 async function configure (gyp, argv) {
   const buildDir = path.resolve('build')
   const configNames = ['config.gypi', 'common.gypi']
@@ -27,6 +32,28 @@ async function configure (gyp, argv) {
     // 'python' should be set by now
     process.env.PYTHON = python
 
+    const prefix = process.config.variables.node_prefix
+    if (!gyp.opts.nodedir &&
+        process.config.variables.use_prefix_to_find_headers) {
+      // check if the headers can be found using the prefix specified
+      // at build time. Use them if they match the version expected
+      let availVersion
+      try {
+        const nodeVersionH = fsSync.readFileSync(path.join(prefix,
+          'include', 'node', 'node_version.h'), { encoding: 'utf8' })
+        const major = nodeVersionH.match(majorRe)[1]
+        const minor = nodeVersionH.match(minorRe)[1]
+        const patch = nodeVersionH.match(patchRe)[1]
+        availVersion = major + '.' + minor + '.' + patch
+      } catch {}
+      if (availVersion === release.version) {
+        // ok version matches, use the headers
+        gyp.opts.nodedir = prefix
+        log.verbose('using local node headers based on prefix',
+          'setting nodedir to ' + gyp.opts.nodedir)
+      }
+    }
+
     if (gyp.opts.nodedir) {
       // --nodedir was specified. use that for the dev files
       nodeDir = gyp.opts.nodedir.replace(/^~/, os.homedir())

test/test-configure-nodedir.js

@@ -0,0 +1,115 @@
+'use strict'
+
+const { describe, it } = require('mocha')
+const assert = require('assert')
+const path = require('path')
+const gyp = require('../lib/node-gyp')
+const requireInject = require('require-inject')
+const semver = require('semver')
+
+const versionSemver = semver.parse(process.version)
+
+const configure = requireInject('../lib/configure', {
+  'graceful-fs': {
+    openSync: () => 0,
+    closeSync: () => {},
+    existsSync: () => true,
+    readFileSync: () => '#define NODE_MAJOR_VERSION ' + versionSemver.major + '\n' +
+        '#define NODE_MINOR_VERSION ' + versionSemver.minor + '\n' +
+        '#define NODE_PATCH_VERSION ' + versionSemver.patch + '\n',
+    promises: {
+      stat: async () => ({}),
+      mkdir: async () => {},
+      writeFile: async () => {}
+    }
+  }
+})
+
+const configure2 = requireInject('../lib/configure', {
+  'graceful-fs': {
+    openSync: () => 0,
+    closeSync: () => {},
+    existsSync: () => true,
+    readFileSync: () => '#define NODE_MAJOR_VERSION 8\n' +
+        '#define NODE_MINOR_VERSION 0\n' +
+        '#define NODE_PATCH_VERSION 0\n',
+    promises: {
+      stat: async () => ({}),
+      mkdir: async () => {},
+      writeFile: async () => {}
+    }
+  }
+})
+
+const SPAWN_RESULT = cb => ({ on: function () { cb() } })
+
+describe('configure-nodedir', function () {
+  it('configure nodedir with node-gyp command line', function (done) {
+    const prog = gyp()
+    prog.parseArgv(['dummy_prog', 'dummy_script', '--nodedir=/usr'])
+
+    prog.spawn = function (program, args) {
+      for (let i = 0; i < args.length; i++) {
+        if (path.join(path.sep, 'usr', 'include', 'node',
+          'common.gypi').localeCompare(args[i]) === 0) {
+          return SPAWN_RESULT(done)
+        }
+      };
+      assert.fail()
+    }
+    configure(prog, [], assert.fail)
+  })
+
+  if (process.config.variables.use_prefix_to_find_headers) {
+    it('use-prefix-to-find-headers build time option - match', function (done) {
+      const prog = gyp()
+      prog.parseArgv(['dummy_prog', 'dummy_script'])
+
+      prog.spawn = function (program, args) {
+        for (let i = 0; i < args.length; i++) {
+          const nodedir = process.config.variables.node_prefix
+          if (path.join(path.sep, nodedir, 'include', 'node',
+            'common.gypi').localeCompare(args[i]) === 0) {
+            return SPAWN_RESULT(done)
+          }
+        };
+        assert.fail()
+      }
+      configure(prog, [], assert.fail)
+    })
+
+    it('use-prefix-to-find-headers build time option - no match', function (done) {
+      const prog = gyp()
+      prog.parseArgv(['dummy_prog', 'dummy_script'])
+
+      prog.spawn = function (program, args) {
+        for (let i = 0; i < args.length; i++) {
+          const nodedir = process.config.variables.node_prefix
+          if (path.join(path.sep, nodedir, 'include', 'node',
+            'common.gypi').localeCompare(args[i]) === 0) {
+            assert.fail()
+          }
+        };
+        return SPAWN_RESULT(done)
+      }
+      configure2(prog, [], assert.fail)
+    })
+
+    it('use-prefix-to-find-headers build time option, target specified', function (done) {
+      const prog = gyp()
+      prog.parseArgv(['dummy_prog', 'dummy_script', '--target=8.0.0'])
+
+      prog.spawn = function (program, args) {
+        for (let i = 0; i < args.length; i++) {
+          const nodedir = process.config.variables.node_prefix
+          if (path.join(path.sep, nodedir, 'include', 'node',
+            'common.gypi').localeCompare(args[i]) === 0) {
+            assert.fail()
+          }
+        };
+        return SPAWN_RESULT(done)
+      }
+      configure(prog, [], assert.fail)
+    })
+  }
+})

test/test-configure-python.js

@@ -11,6 +11,7 @@ const configure = requireInject('../lib/configure', {
   'graceful-fs': {
     openSync: () => 0,
     closeSync: () => {},
+    existsSync: () => {},
     promises: {
       stat: async () => ({}),
       mkdir: async () => {},