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authorpack <pack@packgekko.xyz>2026-08-09 10:37:07 +0000
committerpack <pack@packgekko.xyz>2026-08-09 10:37:07 +0000
commit55a4f1fc869e41aca748c63d3018f0448b1606e0 (patch)
treed132d1d01772b6d53faee3e63c534dea5706b78a /node_modules/node-gyp/lib/find-python.js
downloadcrud-55a4f1fc869e41aca748c63d3018f0448b1606e0.tar.gz
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+'use strict'
+
+const log = require('./log')
+const semver = require('semver')
+const { execFile } = require('./util')
+const win = process.platform === 'win32'
+
+function getOsUserInfo () {
+ try {
+ return require('os').userInfo().username
+ } catch {}
+}
+
+const systemDrive = process.env.SystemDrive || 'C:'
+const username = process.env.USERNAME || process.env.USER || getOsUserInfo()
+const localAppData = process.env.LOCALAPPDATA || `${systemDrive}\\${username}\\AppData\\Local`
+const foundLocalAppData = process.env.LOCALAPPDATA || username
+const programFiles = process.env.ProgramW6432 || process.env.ProgramFiles || `${systemDrive}\\Program Files`
+const programFilesX86 = process.env['ProgramFiles(x86)'] || `${programFiles} (x86)`
+
+const winDefaultLocationsArray = []
+for (const majorMinor of ['311', '310', '39', '38']) {
+ if (foundLocalAppData) {
+ winDefaultLocationsArray.push(
+ `${localAppData}\\Programs\\Python\\Python${majorMinor}\\python.exe`,
+ `${programFiles}\\Python${majorMinor}\\python.exe`,
+ `${localAppData}\\Programs\\Python\\Python${majorMinor}-32\\python.exe`,
+ `${programFiles}\\Python${majorMinor}-32\\python.exe`,
+ `${programFilesX86}\\Python${majorMinor}-32\\python.exe`
+ )
+ } else {
+ winDefaultLocationsArray.push(
+ `${programFiles}\\Python${majorMinor}\\python.exe`,
+ `${programFiles}\\Python${majorMinor}-32\\python.exe`,
+ `${programFilesX86}\\Python${majorMinor}-32\\python.exe`
+ )
+ }
+}
+
+class PythonFinder {
+ static findPython = (...args) => new PythonFinder(...args).findPython()
+
+ log = log.withPrefix('find Python')
+ argsExecutable = ['-c', 'import sys; sys.stdout.buffer.write(sys.executable.encode(\'utf-8\'));']
+ argsVersion = ['-c', 'import sys; print("%s.%s.%s" % sys.version_info[:3]);']
+ semverRange = '>=3.6.0'
+
+ // These can be overridden for testing:
+ execFile = execFile
+ env = process.env
+ win = win
+ pyLauncher = 'py.exe'
+ winDefaultLocations = winDefaultLocationsArray
+
+ constructor (configPython) {
+ this.configPython = configPython
+ this.errorLog = []
+ }
+
+ // 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 (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.
+ async findPython () {
+ const SKIP = 0
+ const FAIL = 1
+ const toCheck = (() => {
+ 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 ' +
+ `"${this.env.NODE_GYP_FORCE_PYTHON}"`)
+ },
+ check: () => this.checkCommand(this.env.NODE_GYP_FORCE_PYTHON)
+ }]
+ }
+
+ const checks = [
+ {
+ before: () => {
+ if (!this.configPython) {
+ this.addLog('--python was not set on the command line')
+ return SKIP
+ }
+ this.addLog(`--python=${this.configPython} was set on the command line`)
+ },
+ check: () => this.checkCommand(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(this.env.PYTHON)
+ }
+ ]
+
+ if (this.win) {
+ checks.push({
+ before: () => {
+ this.addLog(
+ 'checking if the py launcher can be used to find Python 3')
+ },
+ check: () => this.checkPyLauncher()
+ })
+ }
+
+ checks.push(...[
+ {
+ before: () => { this.addLog('checking if "python3" can be used') },
+ check: () => this.checkCommand('python3')
+ },
+ {
+ before: () => { this.addLog('checking if "python" can be used') },
+ check: () => this.checkCommand('python')
+ }
+ ])
+
+ if (this.win) {
+ for (let i = 0; i < this.winDefaultLocations.length; ++i) {
+ const location = this.winDefaultLocations[i]
+ checks.push({
+ before: () => this.addLog(`checking if Python is ${location}`),
+ check: () => this.checkExecPath(location)
+ })
+ }
+ }
+
+ return checks
+ })()
+
+ for (const check of toCheck) {
+ const before = check.before()
+ if (before === SKIP) {
+ continue
+ }
+ if (before === FAIL) {
+ return this.fail()
+ }
+ try {
+ return await check.check()
+ } catch (err) {
+ this.log.silly('runChecks: err = %j', (err && err.stack) || err)
+ }
+ }
+
+ return this.fail()
+ }
+
+ // Check if command is a valid Python to use.
+ // Will exit the Python finder on success.
+ // If on Windows, run in a CMD shell to support BAT/CMD launchers.
+ async checkCommand (command) {
+ let exec = command
+ let args = this.argsExecutable
+ let shell = false
+ if (this.win) {
+ // Arguments have to be manually quoted
+ exec = `"${exec}"`
+ args = args.map(a => `"${a}"`)
+ shell = true
+ }
+
+ this.log.verbose(`- executing "${command}" to get executable path`)
+ // Possible outcomes:
+ // - Error: not in PATH, not executable or execution fails
+ // - Gibberish: the next command to check version will fail
+ // - Absolute path to executable
+ try {
+ const execPath = await this.run(exec, args, shell)
+ this.addLog(`- executable path is "${execPath}"`)
+ return this.checkExecPath(execPath)
+ } catch (err) {
+ this.addLog(`- "${command}" is not in PATH or produced an error`)
+ throw err
+ }
+ }
+
+ // 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 $PATH.
+ // Because the Python launcher supports Python 2 and Python 3, we should
+ // explicitly request a Python 3 version. This is done by supplying "-3" as
+ // the first command line argument. Since "py.exe -3" would be an invalid
+ // executable for "execFile", we have to use the launcher to figure out
+ // where the actual "python.exe" executable is located.
+ async checkPyLauncher () {
+ this.log.verbose(`- executing "${this.pyLauncher}" to get Python 3 executable path`)
+ // Possible outcomes: same as checkCommand
+ try {
+ const execPath = await this.run(this.pyLauncher, ['-3', ...this.argsExecutable], false)
+ this.addLog(`- executable path is "${execPath}"`)
+ return this.checkExecPath(execPath)
+ } catch (err) {
+ this.addLog(`- "${this.pyLauncher}" is not in PATH or produced an error`)
+ throw err
+ }
+ }
+
+ // Check if a Python executable is the correct version to use.
+ // Will exit the Python finder on success.
+ async checkExecPath (execPath) {
+ this.log.verbose(`- executing "${execPath}" to get version`)
+ // Possible outcomes:
+ // - Error: executable can not be run (likely meaning the command wasn't
+ // a Python executable and the previous command produced gibberish)
+ // - Gibberish: somehow the last command produced an executable path,
+ // this will fail when verifying the version
+ // - Version of the Python executable
+ try {
+ const version = await this.run(execPath, this.argsVersion, false)
+ this.addLog(`- version is "${version}"`)
+
+ const range = new semver.Range(this.semverRange)
+ let 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?')
+ throw err
+ }
+ if (!valid) {
+ this.addLog(`- version is ${version} - should be ${this.semverRange}`)
+ this.addLog('- THIS VERSION OF PYTHON IS NOT SUPPORTED')
+ throw new Error(`Found unsupported Python version ${version}`)
+ }
+ return this.succeed(execPath, version)
+ } catch (err) {
+ this.addLog(`- "${execPath}" could not be run`)
+ throw err
+ }
+ }
+
+ // Run an executable or shell command, trimming the output.
+ async run (exec, args, shell) {
+ const env = Object.assign({}, this.env)
+ env.TERM = 'dumb'
+ const opts = { env, shell }
+
+ this.log.silly('execFile: exec = %j', exec)
+ this.log.silly('execFile: args = %j', args)
+ this.log.silly('execFile: opts = %j', opts)
+ try {
+ const [err, stdout, stderr] = await this.execFile(exec, args, opts)
+ 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)
+ return stdout.trim()
+ } catch (err) {
+ this.log.silly('execFile: threw:\n%s', err.stack)
+ throw err
+ }
+ }
+
+ succeed (execPath, version) {
+ this.log.info(`using Python version ${version} found at "${execPath}"`)
+ return execPath
+ }
+
+ 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="${pathExample}"`,
+ ' (accepted by both node-gyp and npm)',
+ '- Set the environment variable PYTHON',
+ 'For more information consult the documentation at:',
+ 'https://github.com/nodejs/node-gyp#installation',
+ '**********************************************************'
+ ].join('\n')
+
+ this.log.error(`\n${errorLog}\n\n${info}\n`)
+ throw new Error('Could not find any Python installation to use')
+ }
+}
+
+module.exports = PythonFinder