From e1a700dcdcb3b69fb400bbec30de3cafba006269 Mon Sep 17 00:00:00 2001 From: Ben Noordhuis Date: Thu, 10 Aug 2017 13:51:41 +0200 Subject: [PATCH] build: better support for python3 systems Improve support for systems where `python` is actually `python3`. Not all systems have a `python2` binary, so simply updating the shebang won't work. What we can do is apply some cleverness: start life as a shell script, locate the python binary, then re-execute the script but this time as python code. Special care is taken to ensure that spaces in arguments are passed on verbatim. --- configure | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/configure b/configure index 44ec5d2c472ed6..994701502ae10e 100755 --- a/configure +++ b/configure @@ -1,4 +1,15 @@ -#!/usr/bin/env python +#!/bin/sh + +# Locate python2 interpreter and re-execute the script. Note that the +# mix of single and double quotes is intentional, as is the fact that +# the ] goes on a new line. +_=[ 'exec' '/bin/sh' '-c' ''' +which python2.7 >/dev/null && exec python2.7 "$0" "$@" +which python2 >/dev/null && exec python2 "$0" "$@" +exec python "$0" "$@" +''' "$0" "$@" +] +del _ import sys if sys.version_info[0] != 2 or sys.version_info[1] not in (6, 7):