From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Noam Postavsky Newsgroups: gmane.emacs.bugs Subject: bug#23779: 25.0.95; consing "SHELLVAR" onto process-environment doesn't remove it from subprocess env Date: Thu, 16 Jun 2016 23:33:02 -0400 Message-ID: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1466134459 27277 80.91.229.3 (17 Jun 2016 03:34:19 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 17 Jun 2016 03:34:19 +0000 (UTC) To: 23779@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Jun 17 05:34:12 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bDkXr-0007nc-4N for geb-bug-gnu-emacs@m.gmane.org; Fri, 17 Jun 2016 05:34:11 +0200 Original-Received: from localhost ([::1]:53544 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDkXq-0000MA-9K for geb-bug-gnu-emacs@m.gmane.org; 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:from:date:message-id:subject :to:content-transfer-encoding; bh=43n3edqgsLUTv6qRtWC2tqCKvGsROWLr8T8S+KNyoS8=; b=VqwHSZpt5uvXWLYSy6p8U7lTp1SXr2PL9rVd/QKG85w93Uy1Hiq9o4tHPooOErUm1o QLcfvqk1jLZBTcIkrXbAghtg/MzY7svFUKnA9j6v7Yna0p8phGsRiMpArjt2lWBOprmg Cn/FdbksIDz5qEKDQH3u41ee+RbUz/OlUCZ9GvTxFeRRRLSr5Eck5LjNuwIMwFfnrlyU l7mV9De+iKaNptXYbmeS64ONyzbZXTrAQFMjJnU7pnpPqEOf2OTqFQrNT2zV7HfDDo8B tJ1SEUjv6qe+MGcE3HI+dZBoEKzMf4y20+c5Syl1FEKmoN0CThqdeDLlPkaUzVh/iM2l ThZA== X-Gm-Message-State: ALyK8tIFdIYgyklmrFK02IAOs1BLIKXI+NYI9lelgqNHUsqgFkQcbBjYEMshn2Max0kgvdkDFiAUMyq3f39uRw== X-Received: by 10.157.1.107 with SMTP id 98mr235619otu.17.1466134383195; Thu, 16 Jun 2016 20:33:03 -0700 (PDT) Original-Received: by 10.157.44.103 with HTTP; Thu, 16 Jun 2016 20:33:02 -0700 (PDT) X-Google-Sender-Auth: 7mkQuAQzrtA5rLAO61cMsjRosHk X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:119647 Archived-At: Start emacs -Q, evaluate the following lisp code (I wrote the return values after ;=3D>) (defun check-env-var (var) (catch 'ret (dolist (var=3Dval (process-lines "env")) (when (string-prefix-p var var=3Dval) (throw 'ret var=3Dval))))) (check-env-var "SHELL");=3D>"SHELL=3D/bin/bash" (let ((process-environment (copy-sequence process-environment))) (setenv "SHELL" nil) (check-env-var "SHELL"));=3D>nil (let ((process-environment (cons "SHELL" process-environment))) (check-env-var "SHELL"));=3D>"SHELL=3D/bin/bash" (let ((process-environment (cons "SHELL=3D" process-environment))) (check-env-var "SHELL"));=3D>"SHELL=3D" As you can see from the 3rd expression, contrary to its docstring, consing the env variable "SHELL" onto process-environment has no effect at all. process-environment is a variable defined in =E2=80=98C source code=E2=80= =99. Its value is [...] Documentation: List of overridden environment variables for subprocesses to inherit. Each element should be a string of the form ENVVARNAME=3DVALUE. Entries in this list take precedence to those in the frame-local environments. Therefore, let-binding =E2=80=98process-environment=E2=80=99= is an easy way to temporarily change the value of an environment variable, irrespective of where it comes from. To use =E2=80=98process-environment= =E2=80=99 to remove an environment variable, include only its name in the list, without "=3DVALUE".