[PATCH] test: use the python interpreter in sh.config

[David Bremner]

The configure script chooses "python" if both python and python{2,3}
exist exists, so this could change the version of python used to run
the test suite.

The checking for ${NOTMUCH_PYTHON} in the test suite is arguably
over-engineering, since the configure step will fail if it can't find
it.
---

Here is an updated version which fixes the subject typo, and actually
tests for the python binary read from sh.config. I'll probably merge this version unless there are objections

 configure           |  2 ++
 test/T390-python.sh |  2 ++
 test/test-lib.sh    | 15 ++++-----------
 3 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/configure b/configure
index 56f550b..20fbed6 100755
--- a/configure
+++ b/configure
@@ -114,6 +114,8 @@ Other environment variables can be used to control configure itself,
 	XAPIAN_CONFIG	The program to use to determine flags for
 			compiling and linking against the Xapian
 			library. [$XAPIAN_CONFIG]
+	PYTHON		Name of python command to use in
+			configure and the test suite.
 
 Additionally, various options can be specified on the configure
 command line.
diff --git a/test/T390-python.sh b/test/T390-python.sh
index 26d0b97..c3f24f7 100755
--- a/test/T390-python.sh
+++ b/test/T390-python.sh
@@ -2,6 +2,8 @@
 test_description="python bindings"
 . ./test-lib.sh
 
+test_require_external_prereq ${NOTMUCH_PYTHON}
+
 add_email_corpus
 
 test_begin_subtest "compare thread ids"
diff --git a/test/test-lib.sh b/test/test-lib.sh
index 3466e9c..db3b6aa 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -621,9 +621,9 @@ test_expect_equal_json () {
     # The test suite forces LC_ALL=C, but this causes Python 3 to
     # decode stdin as ASCII.  We need to read JSON in UTF-8, so
     # override Python's stdio encoding defaults.
-    output=$(echo "$1" | PYTHONIOENCODING=utf-8 python -mjson.tool \
+    output=$(echo "$1" | PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -mjson.tool \
         || echo "$1")
-    expected=$(echo "$2" | PYTHONIOENCODING=utf-8 python -mjson.tool \
+    expected=$(echo "$2" | PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -mjson.tool \
         || echo "$2")
     shift 2
     test_expect_equal "$output" "$expected" "$@"
@@ -1153,14 +1153,8 @@ test_python() {
 	export LD_LIBRARY_PATH=$TEST_DIRECTORY/../lib
 	export PYTHONPATH=$TEST_DIRECTORY/../bindings/python
 
-	# Some distros (e.g. Arch Linux) ship Python 2.* as /usr/bin/python2,
-	# most others as /usr/bin/python. So first try python2, and fallback to
-	# python if python2 doesn't exist.
-	cmd=python2
-	[[ ${test_missing_external_prereq_[python2]} == t ]] && cmd=python
-
 	(echo "import sys; _orig_stdout=sys.stdout; sys.stdout=open('OUTPUT', 'w')"; cat) \
-		| $cmd -
+		| $NOTMUCH_PYTHON -
 }
 
 test_ruby() {
@@ -1325,5 +1319,4 @@ test_declare_external_prereq emacs
 test_declare_external_prereq ${TEST_EMACSCLIENT}
 test_declare_external_prereq gdb
 test_declare_external_prereq gpg
-test_declare_external_prereq python
-test_declare_external_prereq python2
+test_declare_external_prereq ${NOTMUCH_PYTHON}
-- 
2.1.4