No such file or directory: '/sys/class/hwmon/hwmon2/fan4_input'

[ssaip]

I face the following issue running psutil (5.3.1) used by glances v2.11.1. Might be related to #990 .
glances -d gives the following:

2017-09-22 02:28:48,483 -- CRITICAL -- Error while initializing the sensors plugin ([Errno 2] No such file or directory: '/sys/class/hwmon/hwmon2/fan4_input')
2017-09-22 02:28:48,484 -- ERROR -- Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/glances/stats.py", line 117, in _load_plugin
    self._plugins[name] = plugin.Plugin(args=args)
  File "/usr/local/lib/python2.7/dist-packages/glances/plugins/glances_sensors.py", line 53, in __init__
    self.glancesgrabsensors = GlancesGrabSensors()
  File "/usr/local/lib/python2.7/dist-packages/glances/plugins/glances_sensors.py", line 245, in __init__
    self.sfans = psutil.sensors_fans()
  File "/usr/local/lib/python2.7/dist-packages/psutil/__init__.py", line 2298, in sensors_fans
    return _psplatform.sensors_fans()
  File "/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py", line 1193, in sensors_fans
    current = int(cat(base + '_input'))
  File "/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py", line 298, in cat
    with open_binary(fname) if binary else open_text(fname) as f:
  File "/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py", line 190, in open_binary
    return open(fname, "rb", **kwargs)
IOError: [Errno 2] No such file or directory: '/sys/class/hwmon/hwmon2/fan4_input'

Output in python:

>>> psutil.sensors_fans()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/psutil/__init__.py", line 2298, in sensors_fans
	return _psplatform.sensors_fans()
File "/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py", line 1193, in sensors_fans
	current = int(cat(base + '_input'))
File "/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py", line 298, in cat
	with open_binary(fname) if binary else open_text(fname) as f:
File "/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py", line 190, in open_binary
	return open(fname, "rb", **kwargs)
IOError: [Errno 2] No such file or directory: '/sys/class/hwmon/hwmon2/fan4_input'
>>>

The problem is how psutil tries to read the fans:
/usr/local/lib/python2.7/dist-packages/psutil/_pslinux.py

basenames = glob.glob('/sys/class/hwmon/hwmon*/fan*_*')

basenames = sorted(set([x.split('_')[0] for x in basenames]))
for base in basenames:
    unit_name = cat(os.path.join(os.path.dirname(base), 'name'),
                    binary=False)
    label = cat(base + '_label', fallback='', binary=False)
    current = int(cat(base + '_input'))

    ret[unit_name].append(_common.sfan(label, current))

return dict(ret)

as there is a fan4_* but no fan4_input:

00 ~ # ll /sys/class/hwmon/hwmon2/fan*
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_alarm
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_beep
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_input
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_min
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_pulses
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_target
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan1_tolerance
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_alarm
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_beep
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_input
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_min
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_pulses
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_target
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan2_tolerance
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_alarm
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_beep
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_input
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_min
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_pulses
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_target
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan3_tolerance
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan4_target
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan4_tolerance
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_alarm
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_beep
-r--r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_input
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_min
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_pulses
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_target
-rw-r--r-- 1 root root 4096 Sep 22 02:06 /sys/class/hwmon/hwmon2/fan5_tolerance

And here's the output of sensors which is working except cpu fan rpm of 0:
(edit: actually the rpm 0 is fine as well, as I only have one fan (fan2) connected.)

00 ~ # sensors
nct6779-isa-0290
Adapter: ISA adapter

Vcore:                  +0.97 V  (min =  +0.00 V, max =  +1.74 V)
in1:                    +1.02 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
AVCC:                   +3.41 V  (min =  +2.98 V, max =  +3.63 V)
+3.3V:                  +3.39 V  (min =  +2.98 V, max =  +3.63 V)
in4:                    +1.01 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in5:                    +0.00 V  (min =  +0.00 V, max =  +0.00 V)
in6:                    +0.94 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
3VSB:                   +3.41 V  (min =  +2.98 V, max =  +3.63 V)
Vbat:                   +3.30 V  (min =  +2.70 V, max =  +3.63 V)
in9:                    +1.05 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in10:                   +0.14 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in11:                   +0.12 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in12:                   +0.11 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in13:                   +0.12 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in14:                   +0.12 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
fan1:                     0 RPM  (min =    0 RPM)
fan2:                   678 RPM  (min =    0 RPM)
fan3:                     0 RPM  (min =    0 RPM)
fan5:                     0 RPM  (min =    0 RPM)
SYSTIN:                +121.0°C  (high =  +0.0°C, hyst =  +0.0°C)  sensor = ther                                                                                                                                                             mistor
CPUTIN:                 +29.0°C  (high = +80.0°C, hyst = +75.0°C)  sensor = ther                                                                                                                                                             mistor
AUXTIN0:                +29.0°C  (high =  +0.0°C, hyst =  +0.0°C)  ALARM  sensor                                                                                                                                                              = thermistor
AUXTIN1:               +114.0°C    sensor = thermistor
AUXTIN2:               +113.0°C    sensor = thermistor
AUXTIN3:                +36.0°C    sensor = thermal diode
PECI Agent 0:           +25.0°C
PCH_CHIP_CPU_MAX_TEMP:   +0.0°C
PCH_CHIP_TEMP:           +0.0°C
PCH_CPU_TEMP:            +0.0°C
intrusion0:            ALARM
intrusion1:            ALARM
beep_enable:           disabled

acpitz-virtual-0
Adapter: Virtual device
temp1:        +27.8°C  (crit = +99.0°C)
temp2:        +29.8°C  (crit = +99.0°C)

asus-isa-0000
Adapter: ISA adapter
cpu_fan:        0 RPM

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +34.0°C  (high = +80.0°C, crit = +98.0°C)
Core 0:         +34.0°C  (high = +80.0°C, crit = +98.0°C)
Core 1:         +29.0°C  (high = +80.0°C, crit = +98.0°C)
Core 2:         +33.0°C  (high = +80.0°C, crit = +98.0°C)
Core 3:         +30.0°C  (high = +80.0°C, crit = +98.0°C)

Because of this error there is no sensors information at all in glances :(

[giampaolo]

I should have fixed this in 943367f.