Public bug reported:
GPSd fails to access the socket used to communicate PPS signals with
Chrony.
>From the startup log:
gpsd:PROG: PPS:/dev/ttyS0 connect chrony socket failed:
/var/run/chrony.ttyS0.sock, error: -2, errno: 13/Permission denied
The socket in question has these permissions:
$ ls -l /var/run/chrony.ttyS0.sock
srwxr-xr-x 1 root root 0 Apr 10 17:25 /var/run/chrony.ttyS0.sock
gpsd is running as its own user gpsd, and chrony as _chrony.
$ groups gpsd
gpsd : dialout
$ groups _chrony
_chrony : _chrony
I have tried adding gpsd to group _chrony and changing the ownership and
permissions of chrony.ttyS0.sock but to no avail. I always see the
permission denied message.
AppArmor rules for gpsd appear to allow the connection, too:
# default paths feeding GPS data into chrony
/{,var/}run/chrony.tty{,S,USB,AMA}[0-9]*.sock rw,
/tmp/chrony.tty{,S,USB,AMA}[0-9]*.sock rw,
So I am stumped.
** Affects: chrony (Ubuntu)
Importance: Undecided
Status: New
** Affects: gpsd (Ubuntu)
Importance: Undecided
Status: New
** Also affects: chrony (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1872175
Title:
gpsd unable to open chrony PPS socket
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