Asterisk 13 AGI Python: No such file or directory

Asterisk Asterisk Support
1

Hello, I installed Asterisk 13 on Raspberry Pi 3 and recently I’m trying to call Python script from Asterisk dialplan. The script contains email sending function and call of that function. I put it in /var/lib/asterisk/agi-bin/ and I gave permission to execute with chmod 777 to whole folder. In dialplan I’ve got this simply example: exten => 190,1,AGI(sendemail.py). When I try to call this extension I’m receiving error like that:

Executing [190@default:1] AGI(“SIP/1235-00000003”, “sendemail.py”) in new stack
– Launched AGI Script /var/lib/asterisk/agi-bin/sendemail.py
sendemail.py: Failed to execute ‘/var/lib/asterisk/agi-bin/sendemail.py’: No such file or directory
– Auto fallthrough, channel ‘SIP/1235-00000003’ status is ‘UNKNOWN’

What does mean “No such file or directory”?
I just want to execute python script from asterisk dialplan, nothing more. We are not talking about programming asterisk from python.
When I do the same with bash file: exten => 88,1,AGI(/home/pi/opendoor.sh) it executes without any error! Opendoor script is changing state of GPIO pin to turn on/off relay for door.

Any help would be appreciated.

2

Double check the name of your script. Here you have senemail.py:

But your CLI output shows the invocation as sendemail.py. Note that d in the output.

Is it supposed to be sendmail.py?

3

Yes, sorry it’s just a mistake here in post, need to be corrected. I checked it now in program/console and everything is right.

4

AGI doesn’t do anything fancy when spawning the script. It forks the process, then calls execv to execute the file:

	if ((pid = ast_safe_fork(1)) < 0) {
		ast_log(LOG_WARNING, "Failed to fork(): %s\n", strerror(errno));
		return AGI_RESULT_FAILURE;
	}
	if (!pid) {
               ... a bunch of environment set up ...


		/* Close everything but stdin/out/error */
		ast_close_fds_above_n(STDERR_FILENO + 1);

		/* Execute script */
		/* XXX argv should be deprecated in favor of passing agi_argX paramaters */
		execv(script, argv);
		/* Can't use ast_log since FD's are closed */
		ast_child_verbose(1, "Failed to execute '%s': %s", script, strerror(errno));
		/* Special case to set status of AGI to failure */
		fprintf(stdout, "failure\n");
		fflush(stdout);
		_exit(1);
	}

execv is what is returning the error you’re seeing - namely that the file or directory doesn’t exist. That implies that - for whatever reason - your system doesn’t believe that sendemail.py exists. At that point, Asterisk is completely out of the loop in finding or executing the file.

I would triple check that:

  • You have the file name and directory correct
  • The file is executable
  • The file has sufficient permissions to be executed by the user/group that Asterisk is running under
  • The directory path to the file has sufficient permissions to be found by the user/group that Asterisk is running under
5

Could it also produce the error if the #! line contains the wrong name for the Python interpreter?

6

It definitely wouldn’t work if the interpreter specified is wrong. I’m not sure what error it would kick back. From the man page:

Interpreter scripts

An interpreter script is a text file that has execute permission enabled and whose first line is of the form:
#! interpreter [optional-arg]
The interpreter must be a valid pathname for an executable which is not itself a script. If the filename argument of execve() specifies an interpreter script, then interpreter will be invoked with the following arguments:
interpreter [optional-arg] filename arg…
where arg… is the series of words pointed to by the argv argument of execve().

7

How can I check user/group that Asterisk is running under?
And how to add file to this group if so?

8

ps, although you will need to look up the options, or simply look at what you configured it to run as;

chown

See their man pages for details.