[bug#28660] [PATCH] gnu: python-numpy: Give sh store location instead of setting $SHELL.

[Thomas Danckaert]

Hi Guix,

I slightly botched the last numpy update: setting $SHELL works, but 
then we have to set $SHELL for every package which uses numpy's 
distutils.  I don't know how many packages there are, but it includes 
scipy and python-hdf (and therefore those builds are currently broken 
on master...).

The attached patch should fix the issue for all packages, by setting 
the default shell to the “/bin/sh” of the build environment's bash 
package (i.e. bash-minimal).

Thomas

>From cfaebf1b09c71585b5513629005e7cf3c5d17508 Mon Sep 17 00:00:00 2001
From: Thomas Danckaert <address@hidden>
Date: Sun, 1 Oct 2017 14:32:04 +0200
Subject: [PATCH] gnu: python-numpy: Give sh store location instead of setting
 $SHELL.

* gnu/packages/python.scm (python-numpy): [arguments] Don't set $SHELL in the
  environment, but embed the location of bash as a default shell.  Otherwise,
  we have to set $SHELL for every package which uses numpy's distutils.
---
 gnu/packages/python.scm | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index e95c22de1..267715b0f 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -3742,8 +3742,6 @@ between language specification and implementation 
aspects.")
        (modify-phases %standard-phases
         (add-before 'build 'set-environment-variables
          (lambda* (#:key inputs #:allow-other-keys)
-           ;; numpy's distutils uses $SHELL to run external commands.
-          (setenv "SHELL" "bash")
           (call-with-output-file "site.cfg"
             (lambda (port)
               (format port
@@ -3762,6 +3760,10 @@ include_dirs = ~a/include
                       (assoc-ref inputs "openblas")
                       (assoc-ref inputs "lapack")
                       (assoc-ref inputs "lapack"))))
+          ;; Insert bash store location for default shell /bin/sh.
+          (substitute* "numpy/distutils/exec_command.py"
+            (("(os.environ.get\\('SHELL', ')(/bin/sh'\\))" match match-start 
match-end)
+            (string-append match-start (assoc-ref inputs "bash") match-end)))
           ;; Use "gcc" executable, not "cc".
           (substitute* "numpy/distutils/system_info.py"
             (("c = distutils\\.ccompiler\\.new_compiler\\(\\)")
-- 
2.14.1