eryksun added the comment:
In subprocess.py there's the following code that builds a sequence of potential
paths for the executable [1]:
executable = os.fsencode(executable)
if os.path.dirname(executable):
executable_list = (executable,)
else:
# This matches the behavior of os._execvpe().
executable_list = tuple(
os.path.join(os.fsencode(dir), executable)
for dir in os.get_exec_path(env))
In this case it tries to execute "/home/user1/bin/asdf", which fails with
EACCES (to log this using strace, use -f to follow the fork). This occurs in
child_exec in _posixsubprocess.c, in the following loop [2]:
/* This loop matches the Lib/os.py _execvpe()'s PATH search when */
/* given the executable_list generated by Lib/subprocess.py. */
saved_errno = 0;
for (i = 0; exec_array[i] != NULL; ++i) {
const char *executable = exec_array[i];
if (envp) {
execve(executable, argv, envp);
} else {
execv(executable, argv);
}
if (errno != ENOENT && errno != ENOTDIR && saved_errno == 0) {
saved_errno = errno;
}
}
/* Report the first exec error, not the last. */
if (saved_errno)
errno = saved_errno;
saved_errno will be set to EACCES and stored back to errno after all attempts
to execute potential paths fail. This is then reported back to the parent
process, which raises a PermissionError.
[1]: https://hg.python.org/cpython/file/3.5/Lib/subprocess.py#l1463
[2]: https://hg.python.org/cpython/file/3.5/Modules/_posixsubprocess.c#l487
----------
nosy: +eryksun
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<http://bugs.python.org/issue25481>
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