Issue1856

I am unable to write to files under /sys (sysfs) directory using Jython 2.5.2

When I run the attached "jyproc.py" file, I get

Traceback (most recent call last):
  File "jyproc.py", line 4, in <module>
    f.write("1")
IOError: [Errno 13] Permission denied: '/sys/block/sdc/device/delete'

...

Same code runs fine under Python 2.7.2. 

$ jython -V
Jython 2.5.2

$ java -version
java version "1.6.0_30"
Java(TM) SE Runtime Environment (build 1.6.0_30-b12)
Java HotSpot(TM) 64-Bit Server VM (build 20.5-b03, mixed mode)

Attaching similar program written in Java which works just fine. So it doesn't seem to be a Java problem but a Jython problem.

Sorry for the slow response - can you tell me more about your platform? Mainly what os you are on and some details about how /sys (sysfs) is mounted etc?

I am running CentOS 6.3 64-bit which uses Linux 2.6.32.x kernel.

$ mount | grep sysfs 
sysfs on /sys type sysfs (rw)

$ java -version
java version "1.7.0_09-icedtea"
OpenJDK Runtime Environment (rhel-2.3.7.1.el6_3-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

Nothing fancy :)

Please can you run the following jython code on your system and report the results?

Thanks.

################
from java.io import BufferedWriter, FileWriter
import java.lang

if __name__ == "__main__":
    fileName = "/sys/block/sdb/device/delete"
    try:
        writer = BufferedWriter(FileWriter(fileName,True))
        writer.write("1")
        writer.close()
    except java.lang.Exception, e:
        e.printStackTrace()
################

Any updates?

Somewhat similar issue in #2358

We need to come up with a robust testing strategy, using some sort of emulation/virtualization. We normally don't expect tests to being doing something like the following: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/removing_devices.html Perhaps Docker can be used here?

Now #2358 is closed, is this still a live issue?