gwinc.test: inherit python interpreter

Pass sys.executable to the gen_cache.sh script, instead of using a
hard-coded interpreter path

gwinc/test/__main__.py

@@ -90,7 +90,7 @@ def gen_cache(git_hash, path):
     """
     logging.info("creating new cache for hash {}...".format(git_hash))
     subprocess.run(
-        [test_path('gen_cache.sh'), git_hash, path],
+        [test_path('gen_cache.sh'), git_hash, path, sys.executable],
         check=True,
     )
 

gwinc/test/gen_cache.sh

@@ -8,6 +8,8 @@ fi
 
 git_hash="$1"
 cache_dir="$2"
+python="$3"
+[ -z "$python" ] && python=python3
 
 mkdir -p $cache_dir
 cache_dir=$(cd $cache_dir && pwd)
@@ -19,8 +21,8 @@ git archive $git_hash | tar -x -C $gwinc_dir
 cd $gwinc_dir
 
 export LOG_LEVEL=INFO
-for ifo in $(python3 -c "import gwinc; print(' '.join(gwinc.IFOS))") ; do
-    python3 -m gwinc --save $cache_dir/${ifo}.h5 $ifo
+for ifo in $($python -c "import gwinc; print(' '.join(gwinc.IFOS))") ; do
+    $python -m gwinc --save $cache_dir/${ifo}.h5 $ifo
 done
 
 echo $git_hash > $cache_dir/git_hash