[Libguestfs] guestfs_launch() fails when C application is started as a systemd service

[Peter Dimitrov]

Hello,

I have a simple C program that uses libguestfs to extract info about disk
usage from a libvirt domain. It works when ran manually as root, but fails
when started as a systemd service.

I'm attaching the service file, source code and verbose logs from both the
successful manual run and from the service journal.

SELinix is disabled.

Error messages:
libguestfs: set_socket_create_context: getcon failed: (none): Invalid
argument [you can ignore this message if you are not using SELinux + sVirt]
libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL:
Invalid argument [you can ignore this message if you are not using SELinux
+ sVirt]
libguestfs: error: chown: /tmp/libguestfsvMMaec/guestfsd.sock: Operation
not permitted
libguestfs: clear_socket_create_context: setsockcreatecon failed: NULL:
Invalid argument [you can ignore this message if you are not using SELinux
+ sVirt]
libguestfs: trace: launch = -1 (error)
failed to launch domain: Invalid argument

(Note on the service file: CapabilityBoundingSet is for future development
- it seems to make no difference)

Best Regards,
Peter
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