systemd Failed to listen on sockets

[Jack Thomasson]

on CoreOS Stable (1353.7.0) trying An example network service with systemd-activated socket in Python.

systemctl start foo.socket
foo.socket: Failed to listen on sockets: No such file or directory

i know base CoreOS does not have Python but that is easily fixed.

ideas?

[Jack Thomasson]

also fails on 1409.0.0 (alpha); however, succeeds on coreos-developer (1409.0.0+2017-05-18-1149).  now i'm really confused.

[Jack Thomasson]

coreos-developer retains developer tools including /usr/bin/python.  systemd uses the SELinux label of the application in the associated service file.  without /usr/bin/python (not developer) the lookup fails with ENOENT.  the error message is correct and entirely misleading.