Add an os.get_exec_path() function to return the list of directories
that launching a subprocess will search for the executable.
Refactors some code in os._execvpe().
diff --git a/Lib/os.py b/Lib/os.py
index 1c5b5ce..580b983 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -342,28 +342,23 @@
def _execvpe(file, args, env=None):
if env is not None:
- func = execve
+ exec_func = execve
argrest = (args, env)
else:
- func = execv
+ exec_func = execv
argrest = (args,)
env = environ
head, tail = path.split(file)
if head:
- func(file, *argrest)
+ exec_func(file, *argrest)
return
- if 'PATH' in env:
- envpath = env['PATH']
- else:
- envpath = defpath
- PATH = envpath.split(pathsep)
last_exc = saved_exc = None
saved_tb = None
- for dir in PATH:
+ for dir in get_exec_path(env):
fullname = path.join(dir, file)
try:
- func(fullname, *argrest)
+ exec_func(fullname, *argrest)
except error as e:
last_exc = e
tb = sys.exc_info()[2]
@@ -376,6 +371,18 @@
raise last_exc.with_traceback(tb)
+def get_exec_path(env=None):
+ """Returns the sequence of directories that will be searched for the
+ named executable (similar to a shell) when launching a process.
+
+ *env* must be an environment variable dict or None. If *env* is None,
+ os.environ will be used.
+ """
+ if env is None:
+ env = environ
+ return env.get('PATH', defpath).split(pathsep)
+
+
# Change environ to automatically call putenv(), unsetenv if they exist.
from _abcoll import MutableMapping # Can't use collections (bootstrap)