CODEWITHSUNDEEP
pythonpytest
h3rb4l
h3rb4l

Reputation: 73

IOError: [Errno 2] No such file or directory - on linux, using absolute path

I am struggling to find the solution for this. I am using an absolute path that definitely exists in the file system. When same exact path is used in same script with

if host.file(logPath).exists:
    print("Exists: " + logPath)

I get

Exists: /var/opt/jws/jws3.0/v7/testinfra_node1/logs/catalina.out

But when trying:

with open(logPath, "rt") as log:

I am getting:

>               with open(logPath, "rt") as log:
E               IOError: [Errno 2] No such file or directory: '/var/opt/jws/jws3.0/v7/testinfra_node1/logs/catalina.out'

Here is the whole code (it is a testinfra script for testing JWT installation):

import pytest
import testinfra
import time
import os

@pytest.mark.parametrize("jws_version", [("3.0")])

def test_server_recycle(host, jws_version):
    instances = host.check_output("cat /var/opt/jws/jws" + jws_version + "/init/init_instances | grep -oP '(\/.*?\/)((?:[^\/]|\\\\/)+?)(?:(?<!\\\\)\s|$)'")
last = ""
for last in iter(instances.splitlines()):
    pass
last = last.strip().encode('ascii','ignore')
print(last)

instanceName = ""
for instanceName in iter(last.split("/")):
    pass
print(instanceName)

binPath = last + "/bin/"
logDir = last + "/logs/"
logPath = os.path.join(logDir, "catalina.out")
print(logPath)

runningAt0 = isInstanceRunning(host, instanceName)
if host.file(logPath).exists:
    print("Exists: " + logPath)

if (runningAt0):
    with host.sudo():
        host.run(os.path.join(binPath, "shutdown.sh"))    
        with open(logPath, "rt") as log:
            result = waitForEntry(log, "INFO  org.apache.catalina.core.StandardService- Stopping service Catalina","ERROR")
        assert not result.eq("ERROR")
        assert not isInstanceRunning(host, instanceName)
        host.run(os.path.join(binPath, "/bin/startup.sh"))
        with open(logPath, "rt") as log:
            result = waitForEntry(log, "INFO  org.apache.catalina.startup.Catalina- Server startup in","ERROR")
        assert not result.eq("ERROR")
        assert isInstanceRunning(host, instanceName)
else:
    with host.sudo():
        host.run(os.path.join(binPath, "startup.sh"))
        with open(logPath, "rt") as log:
            result = waitForEntry(log, "INFO  org.apache.catalina.core.StandardService- Stopping service Catalina","ERROR")
        assert not result.eq("ERROR")
        assert isInstanceRunning(host, instanceName)
        host.run(os.path.join(binPath, "shutdown.sh"))
        with open(logPath, "rt") as log:
            result = waitForEntry(log, "INFO  org.apache.catalina.startup.Catalina- Server startup in","ERROR")
        assert not result.eq("ERROR")
        assert not isInstanceRunning(host, instanceName)

def isInstanceRunning(host, instanceName):
    processes = host.check_output("ps auwwx | grep catalina.startup.Bootstrap")
    if  "-Dtomcat.inst.name=" + instanceName in processes:
        return True
    else:
        return False

def waitForEntry(file, entry1, entry2):
    while 1:
        file.seek(0,2)
        line = file.readline()
        if entry1 in line:
            return entry1
        else:
            if entry2 in line:
                return entry2
            else:
                time.sleep(0.1)

Instead of

host.file(logPath).exists

I have been also trying

print(host.check_output("cat " + logPath))

and it prints the file contents nicely.

Any ideas on how to approach this? Many thanks in advance!

Edit: Here is how I execute the script:

py.test -v --host=user@host tomcat_test_recycle.py --sudo

Upvotes: 1

Views: 389

Answers (1)

donkopotamus
donkopotamus

Reputation: 23206

The testinfra package appears to integrate testing the state of remote servers into pytest. Thus

host.file(logPath).exists

and

host.check_output("cat " + logPath)

are checking the existence and the contents on a remote server, whereas

open(logPath, "rb")

is acting on the local machine. The file is not on the local machine, it’s on host.

Upvotes: 3

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