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