Run script on receiving email

Jordan

I would like to be able to run a script on receiving an email so this is me testing it out. I'm following the "Processing messages with a script or program" guide exactly and when I run imap2script --config config.json and send a test email I get the following:

2021/06/07 13:18:11 [INFO ] All instances started
2021/06/07 13:18:11 [INFO ] (id=0) Starting imap2script
2021/06/07 13:18:11 [INFO ] (id=0) Connected to mail.de.opalstack.com:993
2021/06/07 13:18:12 [INFO ] (id=0) Logged into test1
2021/06/07 13:18:12 [INFO ] (id=0) Selected folder INBOX
2021/06/07 13:18:12 [INFO ] (id=0) Processing 0 unread message(s)
2021/06/07 13:20:09 [INFO ] (id=0) Got an IDLE mailbox update
2021/06/07 13:20:10 [INFO ] (id=0) Processing 1 unread message(s)
2021/06/07 13:20:10 [DEBUG] (id=0, i=0) Sending to script /home/jordan/mailscript_example.py
2021/06/07 13:20:10 [INFO ] (id=0) Processed 1 message(s)
2021/06/07 13:20:10 [INFO ] (id=0) Got an IDLE mailbox update
: No such file or directory (id=0, i=0) Script Script produced stderr: /usr/bin/env: python3
2021/06/07 13:20:10 [ERROR] (id=0, i=0) Script returned nonzero exit status: exit status 127
2021/06/07 13:20:10 [INFO ] (id=0) Processing 0 unread message(s)

I've checked that /usr/bin/env does exist and have tried changing the shebang line but I then end up with different errors (such as permission denied).

sean

Jordan I think what's happening is that /usr/bin is not on the default PATH for processes spawned without a shell so the env utility is not able to locate python3.

To fix this, skip env and instead use the full path to python3 in /home/jordan/mailscript_example.py, eg:

#!/usr/bin/python3

Jordan

So I've tried it with the example you've given and I've even tried using the python interpreter for my django project on the server but every time it throws me this:

2021/06/08 07:13:40 [INFO ] (id=0) Processing 1 unread message(s)
2021/06/08 07:13:40 [DEBUG] (id=0, i=0) Sending to script /home/jordan/mailscript_example.py
2021/06/08 07:13:40 [INFO ] (id=0) Processed 1 message(s)
2021/06/08 07:13:40 [INFO ] (id=0) Got an IDLE mailbox update
2021/06/08 07:13:40 [ERROR] (id=0, i=0) Error starting process: fork/exec /home/jordan/mailscript_example.py: no such file or directory

/home/jordan/mailscript_example.py definitely exists.

sean

Jordan have you made the script executable, eg chmod 700 /home/jordan/mailscript_example.py ?

Jordan

sean yes i have

sean

Jordan I located your shell user and took a look at your script.

The problem is that it's been saved with DOS-style line endings which are breaking the shebang in the first line of the script, eg:

$ echo foo | ./mailscript_example.py 
-bash: ./mailscript_example.py: /home/jordan/apps/xxxx/env/bin/python^M: bad interpreter: No such file or directory

The ^M in there is the clue.

To fix this, convert the file to UNIX-style line endings with dos2unix:

dos2unix mailscript_example.py

Jordan

sean Thank you very much! This fixed it.