317 lines
10 KiB
JavaScript
Executable file
317 lines
10 KiB
JavaScript
Executable file
'use strict'
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const path = require('path')
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const log = require('npmlog')
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const semver = require('semver')
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const cp = require('child_process')
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const extend = require('util')._extend // eslint-disable-line
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const win = process.platform === 'win32'
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const logWithPrefix = require('./util').logWithPrefix
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function PythonFinder (configPython, callback) {
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this.callback = callback
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this.configPython = configPython
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this.errorLog = []
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}
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PythonFinder.prototype = {
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log: logWithPrefix(log, 'find Python'),
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argsExecutable: ['-c', 'import sys; print(sys.executable);'],
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argsVersion: ['-c', 'import sys; print("%s.%s.%s" % sys.version_info[:3]);'],
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semverRange: '2.7.x || >=3.5.0',
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// These can be overridden for testing:
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execFile: cp.execFile,
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env: process.env,
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win: win,
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pyLauncher: 'py.exe',
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winDefaultLocations: [
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path.join(process.env.SystemDrive || 'C:', 'Python37', 'python.exe'),
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path.join(process.env.SystemDrive || 'C:', 'Python27', 'python.exe')
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],
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// Logs a message at verbose level, but also saves it to be displayed later
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// at error level if an error occurs. This should help diagnose the problem.
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addLog: function addLog (message) {
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this.log.verbose(message)
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this.errorLog.push(message)
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},
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// Find Python by trying a sequence of possibilities.
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// Ignore errors, keep trying until Python is found.
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findPython: function findPython () {
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const SKIP = 0; const FAIL = 1
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var toCheck = getChecks.apply(this)
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function getChecks () {
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if (this.env.NODE_GYP_FORCE_PYTHON) {
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return [{
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before: () => {
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this.addLog(
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'checking Python explicitly set from NODE_GYP_FORCE_PYTHON')
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this.addLog('- process.env.NODE_GYP_FORCE_PYTHON is ' +
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`"${this.env.NODE_GYP_FORCE_PYTHON}"`)
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},
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check: this.checkCommand,
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arg: this.env.NODE_GYP_FORCE_PYTHON
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}]
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}
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var checks = [
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{
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before: () => {
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if (!this.configPython) {
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this.addLog(
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'Python is not set from command line or npm configuration')
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return SKIP
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}
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this.addLog('checking Python explicitly set from command line or ' +
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'npm configuration')
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this.addLog('- "--python=" or "npm config get python" is ' +
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`"${this.configPython}"`)
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},
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check: this.checkCommand,
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arg: this.configPython
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},
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{
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before: () => {
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if (!this.env.PYTHON) {
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this.addLog('Python is not set from environment variable ' +
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'PYTHON')
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return SKIP
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}
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this.addLog('checking Python explicitly set from environment ' +
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'variable PYTHON')
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this.addLog(`- process.env.PYTHON is "${this.env.PYTHON}"`)
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},
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check: this.checkCommand,
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arg: this.env.PYTHON
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},
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{
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before: () => { this.addLog('checking if "python3" can be used') },
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check: this.checkCommand,
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arg: 'python3'
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},
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{
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before: () => { this.addLog('checking if "python" can be used') },
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check: this.checkCommand,
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arg: 'python'
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},
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{
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before: () => { this.addLog('checking if "python2" can be used') },
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check: this.checkCommand,
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arg: 'python2'
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}
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]
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if (this.win) {
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for (var i = 0; i < this.winDefaultLocations.length; ++i) {
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const location = this.winDefaultLocations[i]
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checks.push({
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before: () => {
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this.addLog('checking if Python is ' +
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`${location}`)
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},
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check: this.checkExecPath,
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arg: location
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})
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}
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checks.push({
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before: () => {
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this.addLog(
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'checking if the py launcher can be used to find Python')
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},
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check: this.checkPyLauncher
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})
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}
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return checks
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}
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function runChecks (err) {
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this.log.silly('runChecks: err = %j', (err && err.stack) || err)
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const check = toCheck.shift()
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if (!check) {
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return this.fail()
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}
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const before = check.before.apply(this)
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if (before === SKIP) {
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return runChecks.apply(this)
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}
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if (before === FAIL) {
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return this.fail()
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}
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const args = [runChecks.bind(this)]
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if (check.arg) {
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args.unshift(check.arg)
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}
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check.check.apply(this, args)
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}
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runChecks.apply(this)
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},
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// Check if command is a valid Python to use.
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// Will exit the Python finder on success.
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// If on Windows, run in a CMD shell to support BAT/CMD launchers.
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checkCommand: function checkCommand (command, errorCallback) {
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var exec = command
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var args = this.argsExecutable
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var shell = false
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if (this.win) {
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// Arguments have to be manually quoted
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exec = `"${exec}"`
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args = args.map(a => `"${a}"`)
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shell = true
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}
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this.log.verbose(`- executing "${command}" to get executable path`)
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this.run(exec, args, shell, function (err, execPath) {
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// Possible outcomes:
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// - Error: not in PATH, not executable or execution fails
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// - Gibberish: the next command to check version will fail
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// - Absolute path to executable
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if (err) {
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this.addLog(`- "${command}" is not in PATH or produced an error`)
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return errorCallback(err)
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}
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this.addLog(`- executable path is "${execPath}"`)
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this.checkExecPath(execPath, errorCallback)
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}.bind(this))
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},
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// Check if the py launcher can find a valid Python to use.
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// Will exit the Python finder on success.
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// Distributions of Python on Windows by default install with the "py.exe"
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// Python launcher which is more likely to exist than the Python executable
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// being in the $PATH.
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checkPyLauncher: function checkPyLauncher (errorCallback) {
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this.log.verbose(
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`- executing "${this.pyLauncher}" to get Python executable path`)
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this.run(this.pyLauncher, this.argsExecutable, false,
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function (err, execPath) {
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// Possible outcomes: same as checkCommand
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if (err) {
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this.addLog(
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`- "${this.pyLauncher}" is not in PATH or produced an error`)
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return errorCallback(err)
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}
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this.addLog(`- executable path is "${execPath}"`)
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this.checkExecPath(execPath, errorCallback)
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}.bind(this))
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},
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// Check if a Python executable is the correct version to use.
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// Will exit the Python finder on success.
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checkExecPath: function checkExecPath (execPath, errorCallback) {
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this.log.verbose(`- executing "${execPath}" to get version`)
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this.run(execPath, this.argsVersion, false, function (err, version) {
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// Possible outcomes:
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// - Error: executable can not be run (likely meaning the command wasn't
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// a Python executable and the previous command produced gibberish)
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// - Gibberish: somehow the last command produced an executable path,
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// this will fail when verifying the version
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// - Version of the Python executable
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if (err) {
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this.addLog(`- "${execPath}" could not be run`)
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return errorCallback(err)
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}
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this.addLog(`- version is "${version}"`)
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const range = new semver.Range(this.semverRange)
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var valid = false
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try {
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valid = range.test(version)
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} catch (err) {
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this.log.silly('range.test() threw:\n%s', err.stack)
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this.addLog(`- "${execPath}" does not have a valid version`)
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this.addLog('- is it a Python executable?')
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return errorCallback(err)
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}
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if (!valid) {
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this.addLog(`- version is ${version} - should be ${this.semverRange}`)
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this.addLog('- THIS VERSION OF PYTHON IS NOT SUPPORTED')
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return errorCallback(new Error(
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`Found unsupported Python version ${version}`))
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}
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this.succeed(execPath, version)
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}.bind(this))
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},
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// Run an executable or shell command, trimming the output.
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run: function run (exec, args, shell, callback) {
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var env = extend({}, this.env)
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env.TERM = 'dumb'
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const opts = { env: env, shell: shell }
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this.log.silly('execFile: exec = %j', exec)
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this.log.silly('execFile: args = %j', args)
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this.log.silly('execFile: opts = %j', opts)
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try {
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this.execFile(exec, args, opts, execFileCallback.bind(this))
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} catch (err) {
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this.log.silly('execFile: threw:\n%s', err.stack)
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return callback(err)
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}
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function execFileCallback (err, stdout, stderr) {
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this.log.silly('execFile result: err = %j', (err && err.stack) || err)
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this.log.silly('execFile result: stdout = %j', stdout)
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this.log.silly('execFile result: stderr = %j', stderr)
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if (err) {
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return callback(err)
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}
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const execPath = stdout.trim()
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callback(null, execPath)
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}
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},
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succeed: function succeed (execPath, version) {
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this.log.info(`using Python version ${version} found at "${execPath}"`)
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process.nextTick(this.callback.bind(null, null, execPath))
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},
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fail: function fail () {
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const errorLog = this.errorLog.join('\n')
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const pathExample = this.win ? 'C:\\Path\\To\\python.exe'
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: '/path/to/pythonexecutable'
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// For Windows 80 col console, use up to the column before the one marked
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// with X (total 79 chars including logger prefix, 58 chars usable here):
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// X
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const info = [
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'**********************************************************',
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'You need to install the latest version of Python.',
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'Node-gyp should be able to find and use Python. If not,',
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'you can try one of the following options:',
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`- Use the switch --python="${pathExample}"`,
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' (accepted by both node-gyp and npm)',
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'- Set the environment variable PYTHON',
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'- Set the npm configuration variable python:',
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` npm config set python "${pathExample}"`,
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'For more information consult the documentation at:',
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'https://github.com/nodejs/node-gyp#installation',
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'**********************************************************'
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].join('\n')
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this.log.error(`\n${errorLog}\n\n${info}\n`)
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process.nextTick(this.callback.bind(null, new Error(
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'Could not find any Python installation to use')))
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}
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}
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function findPython (configPython, callback) {
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var finder = new PythonFinder(configPython, callback)
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finder.findPython()
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}
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module.exports = findPython
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module.exports.test = {
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PythonFinder: PythonFinder,
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findPython: findPython
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}
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