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python: more informative error #1269

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python: more informative error #1269

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2 changes: 1 addition & 1 deletion .jshintrc
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@@ -1,7 +1,7 @@
{
"asi": true,
"laxcomma": true,
"es5": true,
"esversion": 6,
"node": true,
"strict": false
}
8 changes: 6 additions & 2 deletions bin/node-gyp.js
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Expand Up @@ -87,8 +87,12 @@ function run () {
prog.commands[command.name](command.args, function (err) {
if (err) {
log.error(command.name + ' error')
log.error('stack', err.stack)
errorMessage()
if (err.noPython) {
log.error(err.message)
} else {
log.error('stack', err.stack)
errorMessage()
}
log.error('not ok')
return process.exit(1)
}
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35 changes: 24 additions & 11 deletions lib/configure.js
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Expand Up @@ -461,7 +461,7 @@ PythonFinder.prototype = {
this.log.silly('stripping "rc" identifier from version')
version = version.replace(/rc(.*)$/ig, '')
}
var range = semver.Range('>=2.5.0 <3.0.0')
var range = semver.Range('>=2.6.0 <3.0.0')
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Should this be 2.7.0 instead of 2.6.0 at this point? Python 2.6 has been EOL for 5 years.

var valid = false
try {
valid = range.test(version)
Expand All @@ -479,19 +479,32 @@ PythonFinder.prototype = {
},

failNoPython: function failNoPython () {
var errmsg =
'Can\'t find Python executable "' + this.python +
'", you can set the PYTHON env variable.'
this.callback(new Error(errmsg))
const err = new Error(
'\n******************************************************************\n' +
`node-gyp can't use "${this.python}",\n` +
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Did you mean to change the wording from "can't find" to "can't use"?

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Yes because this error is printed both when python can't be found, and on windows when it's a bad version.
In #1268 the error outputed was:

stack Error: Can't find Python executable "C:\Program Files\Python35\python.EXE", you can set the PYTHON env variable.

which makes less sense.

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Is it possible to distinguish between "can't be found" and bad version? In the example output in the PR description (i.e. the not found case), I think the message is now worse.

node-gyp can't use "python",

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It's quite convoluted code...
I'll give it another look in the morning but I can't promise I can find an elegant solution. This code comes after several rounds of geusses so it difficult to know what was found but deemed unsuitable or if nothing was found at all.

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Didn't notice this PR before doing my own fix. Solves the above issue and detects if there is a wrong version + a possible infinite loop fix. See #1325

'It is recommended that you install python 2.7, set the PYTHON env,\n' +
'or use the --python switch to point to a Python >= v2.6.0 & < 3.0.0.\n' +
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Should this be 2.7.0 instead of 2.6.0 at this point? Python 2.6 has been EOL for 5 years.

'For more information consult the documentation at:\n' +
'https://github.com/nodejs/node-gyp#installation\n' +
'***********************************************************************'
);
err.noPython = true;
this.callback(err)
},

failPythonVersion: function failPythonVersion (badVersion) {
var errmsg =
'Python executable "' + this.python +
'" is v' + badVersion + ', which is not supported by gyp.\n' +
'You can pass the --python switch to point to ' +
'Python >= v2.5.0 & < 3.0.0.'
this.callback(new Error(errmsg))
const err = new Error(
'\n******************************************************************\n' +
`Python executable "${this.python}" is v${badVersion}\n` +
'this version is not supported by GYP and hence by node-gyp.\n' +
'It is recommended that you install python 2.7, set the PYTHON env,\n' +
'or use the --python switch to point to a Python >= v2.6.0 & < 3.0.0.\n' +
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Should this be 2.7.0 instead of 2.6.0 at this point? Python 2.6 has been EOL for 5 years.

'For more information consult the documentation at:\n' +
'https://github.com/nodejs/node-gyp#installation\n' +
'***********************************************************************'
);
err.noPython = true;
this.callback(err)
},

// Called on Windows when "python" isn't available in the current $PATH.
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31 changes: 17 additions & 14 deletions test/test-find-python.js
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Expand Up @@ -74,7 +74,7 @@ test('find python - python', function (t) {
})

test('find python - python too old', function (t) {
t.plan(4)
t.plan(5)

var f = new TestPythonFinder('python', done)
f.which = function(program, cb) {
Expand All @@ -88,13 +88,14 @@ test('find python - python too old', function (t) {
}
f.checkPython()

function done(err, python) {
t.ok(/is not supported by gyp/.test(err))
function done(err) {
t.ok(/this version is not supported by GYP/.test(err))
t.ok(/For more information consult the documentation/.test(err))
}
})

test('find python - python too new', function (t) {
t.plan(4)
t.plan(5)

var f = new TestPythonFinder('python', done)
f.which = function(program, cb) {
Expand All @@ -108,8 +109,9 @@ test('find python - python too new', function (t) {
}
f.checkPython()

function done(err, python) {
t.ok(/is not supported by gyp/.test(err))
function done (err) {
t.ok(/this version is not supported by GYP/.test(err))
t.ok(/For more information consult the documentation/.test(err))
}
})

Expand All @@ -123,8 +125,8 @@ test('find python - no python', function (t) {
}
f.checkPython()

function done(err, python) {
t.ok(/Can't find Python executable/.test(err))
function done(err) {
t.ok(/For more information consult the documentation/.test(err))
}
})

Expand Down Expand Up @@ -170,8 +172,8 @@ test('find python - no python2, no python, unix', function (t) {
}
f.checkPython()

function done(err, python) {
t.ok(/Can't find Python executable/.test(err))
function done(err) {
t.ok(/For more information consult the documentation/.test(err))
}
})

Expand Down Expand Up @@ -242,7 +244,7 @@ test('find python - python 3, use python launcher', function (t) {

test('find python - python 3, use python launcher, python 2 too old',
function (t) {
t.plan(9)
t.plan(10)

var f = new TestPythonFinder('python', done)
f.checkedPythonLauncher = false
Expand Down Expand Up @@ -271,8 +273,9 @@ test('find python - python 3, use python launcher, python 2 too old',
}
f.checkPython()

function done(err, python) {
t.ok(/is not supported by gyp/.test(err))
function done(err) {
t.ok(/this version is not supported by GYP/.test(err))
t.ok(/For more information consult the documentation/.test(err))
}
})

Expand Down Expand Up @@ -334,6 +337,6 @@ test('find python - no python, no python launcher, bad guess', function (t) {
f.checkPython()

function done(err, python) {
t.ok(/Can't find Python executable/.test(err))
t.ok(/For more information consult the documentation/.test(err))
}
})