reset history

.gitignore

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+# ---> Python
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# ---> VisualStudioCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+
+config.yaml

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python: Current File",
+            "type": "python",
+            "request": "launch",
+            "module": "onlyone",
+            "console": "integratedTerminal",
+            "args": ["--configFile","config.yaml", "--server"]
+        }
+    ]
+}

LICENSE

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+MIT License
+
+Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# onlyone
+
+pip install PyYAML
+

config.example.yaml

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+defaultProcess: nano
+processes:
+- key: cat
+  cmd: cat
+- key: nano
+  cmd: nano 

onlyone/__init__.py

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+from distutils.command.config import config
+import os
+import psutil
+import logging
+import yaml
+from typing import List
+from onlyone import namedpipes
+
+DEFAULT_CONFIG_PATH = "/etc/onlyone/config.yaml"
+
+log = logging.getLogger(__name__)
+
+def config_file_to_dict(path:str):
+    if not os.path.isfile(path):
+        log.error("missing file " + path)
+        raise "missing file " + path
+        return
+    log.info("trying to read file : " +  path)
+    configTxt = open(path, "r").read()
+    log.info("config file content : " +  configTxt)
+    log.info("trying read yaml")
+    retval = yaml.safe_load(configTxt)
+    return retval
+
+def __is_process(cmd:str, arr):
+    item = " ".join(arr)
+    #log.info("[onlyone][startprocess] -> " + item + " ends with " + cmd) 
+    if(item.endswith(cmd)):
+        return True
+    
+    #log.info("[onlyone][startprocess] -> " + item + " ends with " + cmd.replace("\"", "")) 
+    if(item.endswith(cmd.replace("\"", ""))):
+        return True
+    #log.info("[onlyone][startprocess] -> " + item + " eq " + cmd) 
+    if(item == cmd):
+        return True
+    #log.info("[onlyone][startprocess] -> " + item + " eq " + cmd.replace("\"", "")) 
+    
+    if(item == cmd.replace("\"", "")):
+          return True
+    
+    #log.info("compare finished not equal") 
+    return False
+
+def isrunning(cmd:str):
+    return __is_process(cmd, psutil.process_iter())
+
+def __isrunning(cmd:str, processes):
+    for proc in processes:
+        if __is_process(cmd,proc.cmdline()):
+            return True
+    return False
+
+def startprocess(cmd):
+    try:
+        os.popen(cmd)
+        log.info("[onlyone][startprocess] -> processed started : " + cmd) 
+    except OSError as e:
+        log.error("eror")
+    except:
+        log.error("eror")
+    
+
+def __killprocesses(killcmds:List, sysprocesses: List):
+    if killcmds == None :
+        return False
+    for proc in sysprocesses:
+        if  any( __is_process(x, proc.cmdline()) for x in killcmds):
+            try:
+               proc.kill()
+               log.info("[onlyone][__killprocesses] -> processed killed : " + proc.name())
+            except: 
+               log.info("[onlyone][__killprocesses] -> error killing process")
+                          
+           
+    return False
+
+
+def killprocesses(killcmds:List):
+    return __killprocesses(killcmds, psutil.process_iter())
+    
+
+
+def onlyone(cmd:str, killcmds:list):
+    log.info("[onlyone][onlyone] -> invoked start " + cmd + ", kill " + str(killcmds))
+    processes = psutil.process_iter()
+    __killprocesses(killcmds, processes)
+    if (not(__isrunning(cmd, processes))):
+        startprocess(cmd)
+    #__forceoneprocessinstance(cmd, processes)
+
+class Manager:
+    def __init__(self):
+        self.__processes=[]
+        self.__current=None
+
+    def load(self, dict:dict, loadDefault:bool):
+        if(dict == None):return
+        if("processes" in dict):
+            for p in dict["processes"]:
+                if "key" in  p and "cmd" in p:
+                    self.addprocess(p["key"], p["cmd"])
+        if(loadDefault and "defaultProcess" in dict):
+            self.current(dict["defaultProcess"])
+        
+    
+    def addprocess(self, key, cmd):
+        self.__processes.append({"key": key, "cmd":cmd})
+      
+    def current(self):
+        if self.__current == None:
+            return None
+        else:
+            return self.__current["key"]
+
+    def current(self, key):
+        item = None
+        if key!=None:
+            for x in self.__processes:
+                if x["key"] == key:
+                    item =x        
+        if item == None:
+            killprocesses([x["cmd"] for x in self.__processes])
+            self._current = None
+            return
+        
+        onlyone(item["cmd"], [x["cmd"] for x in self.__processes if x["key"]!=item["key"]])
+        self._current = item["key"]
+
+
+class Server:
+    def __init__(self, configPath):
+        self.manager = Manager()
+        if(configPath != None and configPath!=""):
+            configDict = config_file_to_dict(configPath)
+            self.manager.load(configDict, True)
+        self.npserver = namedpipes.Server(self.manager)
+   

onlyone/__main__.py

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+from asyncio.base_events import Server
+import logging
+import argparse
+from types import new_class
+from typing import List
+import sys
+import yaml
+import os
+import onlyone
+import onlyone.namedpipes
+
+
+
+
+
+logging.basicConfig(level="DEBUG")
+log = logging.getLogger(__name__)
+parser = argparse.ArgumentParser(description='onlyone')
+parser.add_argument('--configFile', type=str, required=False, help='configfile')
+parser.add_argument('--server', action='store_const', const=True, help='server mode')
+args = parser.parse_args()
+
+log.info("arguments - " + str(sys.argv))
+log.info("Current Path:" + os.getcwd())
+if args.server:
+    configPath = onlyone.DEFAULT_CONFIG_PATH
+    if args.configFile:
+       configPath = args.configFile
+    server = onlyone.Server(configPath)
+    
+    

onlyone/namedpipes/__init__.py

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+
+import os
+import errno
+import logging
+from signal import default_int_handler
+import threading
+import subprocess
+
+FIFO_PATH="/tmp/onlyone_fifo"
+SECURITY_GROUP="onlyone"
+
+log = logging.getLogger(__name__)
+
+def securitygroup_check(groupName:str):
+    if not securitygroup_exists(groupName):
+        securitygroup_create(groupName)
+
+def securitygroup_create(groupName:str):
+     try:
+         
+         subprocess.run(['groupadd', groupName])      
+     except:
+         print(f"Failed to create group " + groupName)                     
+         raise
+
+def securityfifo_checkpermissions(fifoPath:str, groupName:str):
+     try:
+         
+         subprocess.run(['chown', 'root:' + groupName, fifoPath]) 
+         subprocess.run(['chmod', '660', fifoPath])     
+     except:
+         print(f"Failed to set permissions")                     
+         raise
+
+def securitygroup_exists(groupName:str):
+    with open("/etc/group", "r") as groupFile:
+        for line in groupFile:
+            if line.startswith(groupName):
+                return True
+    return False
+
+def createfifo(path):
+    try:
+        os.mkfifo(path)
+    except OSError as oe: 
+        if oe.errno != errno.EEXIST:
+            raise
+
+
+
+class Server:
+    def __init__(self, manager):
+        self.manager=manager
+        self__fifoname=""
+        securitygroup_check(SECURITY_GROUP)
+        createfifo(FIFO_PATH)
+        securityfifo_checkpermissions(FIFO_PATH, SECURITY_GROUP)
+        readTask = ReadTask(self)        
+        self.__readThread = threading.Thread(target=readTask.run, args = (FIFO_PATH,) )
+        self.__readThread.start()
+
+    def kill(self):
+        self.__readThread.kill()
+
+class ReadTask:
+    def __init__(self, server):
+        self.__kill=False
+        self.server=server
+
+    def kill(self):
+        self.__kill=True
+    
+    def read(self, fifoname):
+        log.info("waiting FIFO...")
+        with open(fifoname) as fifo:
+            log.info("FIFO opened")
+            while True:
+                data = fifo.read()
+                if len(data) == 0:
+                    log.info("FIFO closed")
+                    break
+                log.info('FIFO Data: "{0}"'.format(data))
+                self.server.manager.current(format(data).strip())
+
+    def run(self, fifoname):
+        while True:
+            if self.__kill:
+                return
+            self.read(fifoname)