X-Recipient: archive-cygwin AT delorie DOT com X-Original-To: cygwin AT cygwin DOT com Delivered-To: cygwin AT cygwin DOT com DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 98469388E821 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=yandex.ru Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=anrdaemon AT yandex DOT ru DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1612379101; bh=g29ie7w1JtRz5zuan2muTVjtMLWCNh33K8soiSF2H0g=; h=In-Reply-To:Subject:To:From:Message-ID:References:Date:Reply-To; b=B+U+ZB6CZXTu3xBW5bFuHvuBaASZEF8QlvbwWeDoeuqpsIEeYnPNpRVTcucewvgzt VmHkuvg+AoaB5BH8KASP/jiXW8gt73Hf+WbeHWxh0n01KUV51BeGz/W5+UdORLLJbl mYF54jqgwlY8Tjf0lR4iG7GW/ObR1CBiBTt8fosE= Authentication-Results: vla5-8f5c42dab783.qloud-c.yandex.net; dkim=pass header.i=@yandex.ru Date: Wed, 3 Feb 2021 21:55:51 +0300 From: Andrey Repin X-Mailer: The Bat! (v6.8.8) Home X-Priority: 3 (Normal) Message-ID: <659800771.20210203215551@yandex.ru> To: "Lemke, Michael SF/HZA-ZIC2" , cygwin AT cygwin DOT com Subject: Re: python sys.executable inconsistency if called from cmd In-Reply-To: References: <399245376 DOT 20210203182748 AT yandex DOT ru> MIME-Version: 1.0 X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_THEBAT, NICE_REPLY_A, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: cygwin AT cygwin DOT com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: cygwin-bounces AT cygwin DOT com Sender: "Cygwin" Greetings, Lemke, Michael SF/HZA-ZIC2! > On Wednesday, February 3, 2021 4:28 PM Andrey Repin wrote: >>Greetings, Lemke, Michael SF/HZA-ZIC2! >> >>> I don't know anything about python but want to use cygwin's >>> python from nodejs npm with node-gyp. The node-gyp module is trying to >>> find the python executable path from sys.executable and fails. >> >>If that's true, then it should be fixed upstream. > Good to know but I doubt that they will. For those who need this - > here is a workaround for node-gyp v5.1.0 I just found: Precedently, MS Visual Studio Code comes with a wrapper, that deals with Cygwin just fine so far. > cygwin> mkdir /c/Python37 > cygwin> ln `which python3.6m` /c/Python37/python.exe > I aware of the version clash here but c:\Python37 is one of a > few explicit locations this node-gyp looks at. Doesn't seem > confused if the versions don't match. The file you link to > must be the actual Cygwin executable not any of the python > links in /bin. >> >>> While investigating this I found this to me quite inconsistent >>> behavior: >> >>> cygwin> /bin/python3.6m.exe -c 'import sys; print(sys.executable);' >>> /bin/python3.6m >> >>> cygwin> python3.6m -c 'import sys; print(sys.executable);' >>> /usr/bin/python3.6m >> >>> cygwin> python3.6 -c 'import sys; print(sys.executable);' >>> /usr/bin/python3.6 >> >>> cygwin> python3.6m.exe -c 'import sys; print(sys.executable);' >>> /usr/bin/python3.6m >> >> >>> cmd> c:/MyStuff/NCygwin64/bin/python3.6m.exe -c 'import sys; print(sys.executable);' >>> /usr/bin/python3.6m >> >>> cmd> rem add cygwin path to Windows: >>> cmd> path %PATH%;c:\MYSTUFF\ncygwin64\bin >> >>> cmd> python3.6m.exe -c 'import sys; print(sys.executable);' >>> /c/MYSTUFF/ncygwin64/bin/python3.6m >> >>> With CMD I'll never get an executable that actually works from cmd. >>> Is this expected? >> >>Yes. This is Cygwin, not Windows CMD. > Sure but python seems to start just fine under cmd and it does do > some gyrations with sys.executable dependent on calling environment. > So this looks somewhat fishy to me. Nothing "phishy". Cygwin programs work in POSIX environment, this is no surprise that paths you see in Cygwin are POSIX, unless specifically converted to Windows paths. At the same time, Cygwin programs are Windows executables. Would be surprising if they would NOT start by themselves. Said that, it is generally not expected that Cygwin programs would accept native Windows paths, although in many cases, they do just fine. The reverse also applies. Windows programs don't understand Cygwin paths and there's no simple way to convert them outside the given Cygwin environment. Use cygpath. >>> Is there a way around to make this work? >> >>Yes, write scripts correctly, correctly translate paths. > See above. -- With best regards, Andrey Repin Wednesday, February 3, 2021 20:03:43 Sorry for my terrible english... -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple