start to make sh code reusable.

hope the configure doesn't blow up, locally tested.

this now requires readlink(1) and so far only serves
the purpose to get to call python indepent of setting
a python version in a Makefile for which with the current
layout we'd have to run configure which would require
python. Or we just record the location or name of the
python executable in config.mk...

1 files changed, 3 insertions, 47 deletions

diff --git a/configure b/configure
index f6af08f..3014035 100755
--- a/configure
+++ b/configure
@@ -30,53 +30,9 @@
 #
 # 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 '$2 ~ /3.7/ { print }'`"; then
-        python="python3"
-    else
-        echo "*** At least python 3.7 is required for the buildsystem"
-        exit 1
-    fi
-# elif existence python3.1; then
-#     python="python3.1"
-# elif existence python3.2; then
-#     python="python3.2"
-# elif existence python3.3; then
-#     python="python3.3"
-# elif existence python3.4; then
-#     python="python3.4"
-# elif existence python3.5; then
-#     python="python3.5"
-# elif existence python3.6; then
-#     python="python3.6"
-elif existence python3.7; then
-    python="python3.7"
-elif existence python3.8; then
-    python="python3.8"
-else
-    echo "*** No known python3 executable found in path ***"
-    echo "*** falling back to env(1) python             ***"
-    # Unreliable, but if env finds no python, we still can
-    # not assume python in a fixed location.
-    # TODO: Check this in a clean chroot!
-    python="env python"
-fi
-
-# we could check the return value here via || echo "blafoo"
-# or fail anyway once configure.py is invoked because we
-# don't have python if we reach the point to fail.
-PYTHON=$($python -c 'import sys; print(sys.executable)')
+dir=$(dirname "$(readlink -f -- "$0")")
+. $dir/sh/lib.sh/existence.sh
+. $dir/sh/lib.sh/existence_python.sh
 
 scriptpath=build-system/taler-build-scripts