1 files changed, 83 insertions, 1 deletions
diff --git a/configure b/configure
index 5ea41c58a..644d471de 120000..100755
--- a/configure
+++ b/configure
@@ -1 +1,83 @@
-build-scripts/configure
-\ No newline at end of file
+#!/bin/sh
+
+# This file is part of TALER
+# (C) 2019 GNUnet e.V.
+#
+# This is very simple POSIX sh script which
+# identifies the first matching
+# python3 identifier in $PATH and produces
+# configure.py from configure.py.in, and then
+# calls the new executable configure.py.
+#
+# It should be portable on Unices. Report bugs on
+# the bugtracker if you discover that it isn't
+# working as intended.
+#
+# Authors:
+# Author: ng0 <ng0@taler.net>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE
+# LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+# THIS SOFTWARE.
+#
+# SPDX-License-Identifier: 0BSD
+
+# there is a function used in curl to replicate which(1), but
+# it uses too many other tools. this one uses command and in
+# gnunet so far has no reports about failures.
+existence()
+{
+    command -v "$1" >/dev/null 2>&1
+}
+
+# We have to check every possible variant of the
+# executable name because there is a PEP which
+# defines the executable to be like this.
+if existence python3; then
+    python="python3"
+elif existence python3.1; then
+    python="python3.1"
+elif existence python3.2; then
+    python="python3.2"
+elif existence python3.3; then
+    python="python3.3"
+elif existence python3.4; then
+    python="python3.4"
+elif existence python3.5; then
+    python="python3.5"
+elif existence python3.6; then
+    python="python3.6"
+elif existence python3.7; then
+    python="python3.7"
+elif existence python3.8; then
+    python="python3.8"
+else
+    echo "*** No known python3 executable found in path ***"
+    echo "*** falling back to env(1) python             ***"
+    # Unreliable, but if env finds no python, we still can
+    # not assume python in a fixed location.
+    # TODO: Check this in a clean chroot!
+    python="env python"
+fi
+
+# we could check the return value here via || echo "blafoo"
+# or fail anyway once configure.py is invoked because we
+# don't have python if we reach the point to fail.
+PYTHON=$($python -c 'import sys; print(sys.executable)')
+#echo $PYTHON
+
+
+# Call configure.py, assuming all went well.
+# $1 is read by configure.py as the prefix.
+# If $1 is empty, the python script checks the
+# environment for PREFIX. We might need more
+# variables and switches, such as DESTDIR.
+exec $PYTHON ./configure.py $@