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#!/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
if test ! -z "`python3 --version | awk '$2 ~ /3.7/ { print }'`"; then
python="python3"
else
echo "*** At least python 3.7 is required for the buildsystem"
exit 1
fi
# elif existence python3.1; then
# python="python3.1"
# elif existence python3.2; then
# python="python3.2"
# elif existence python3.3; then
# python="python3.3"
# elif existence python3.4; then
# python="python3.4"
# elif existence python3.5; then
# python="python3.5"
# elif existence python3.6; then
# python="python3.6"
elif existence python3.7; then
python="python3.7"
elif existence python3.8; then
python="python3.8"
else
echo "*** No known python3 executable found in path ***"
echo "*** falling back to env(1) python ***"
# Unreliable, but if env finds no python, we still can
# not assume python in a fixed location.
# TODO: Check this in a clean chroot!
python="env python"
fi
# we could check the return value here via || echo "blafoo"
# or fail anyway once configure.py is invoked because we
# don't have python if we reach the point to fail.
PYTHON=$($python -c 'import sys; print(sys.executable)')
# 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 $@
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