YML executable paths, "logs" subcommand

example/Makefile

@@ -0,0 +1 @@
+../Makefile

example/base.conf

@@ -2,6 +2,6 @@ export SUFFIX_PROJECT=.project
 export SUFFIX_DOWN=.down
 
 export DOCKERNET=kiwinet
-export DOCKERCIDR=10.13.37.0/24
+export DOCKERCIDR=10.22.46.0/24
 
 export TARGETROOT=/var/kiwi

example/hello-world.project/docker-compose.yml

@@ -0,0 +1,15 @@
+version: "2"
+
+networks:
+  # reachable from outside
+  default:
+    driver: bridge
+  # interconnects projects
+  kiwihub:
+    external:
+      name: $DOCKERNET
+
+services:
+  hello-world:
+    image: alpine:latest
+    command: sh -c 'while :; do echo Hello World; sleep 10; done'

example/kiwi.yml

@@ -0,0 +1,22 @@
+######################################
+# kiwi-config instance configuration #
+######################################
+
+version: '0.1'
+
+runtime:
+  storage: /var/kiwi
+  env: null
+
+markers:
+  project: .project
+  down: .down
+
+network:
+  name: kiwinet
+  cidr: 10.22.46.0/24
+
+executables:
+  docker: /usr/bin/docker
+  docker-compose: /usr/local/bin/docker-compose
+  sudo: /usr/bin/sudo

kiwi.yml

@@ -1 +0,0 @@
-version: '0.1'

src/default.kiwi.yml

@@ -2,12 +2,16 @@
 # kiwi-config instance configuration #
 ######################################
 version:
+runtime:
+  storage: /var/kiwi
+  env: null
 markers:
   project: .project
   down: .down
 network:
   name: kiwinet
   cidr: 10.22.46.0/24
-runtime:
-  storage: /var/kiwi
-  env: null
+executables:
+  docker: null
+  docker-compose: null
+  sudo: null

src/kiwi/config.py

@@ -9,6 +9,7 @@ from .core import KIWI_ROOT, KIWI_CONF_NAME
 # CONSTANTS
 
 DEFAULT_KIWI_CONF_NAME = KIWI_ROOT + "/default.kiwi.yml"
+VERSION_TAG_NAME = KIWI_ROOT + "/version-tag"
 
 
 class Config:
@@ -49,35 +50,39 @@ class Config:
 
         return yml_string
 
-    def __update_from_file(self, filename):
+    def _update_from_file(self, filename):
         with open(filename, 'r') as stream:
             try:
                 self.__yml_content.update(yaml.safe_load(stream))
             except yaml.YAMLError as exc:
                 logging.error(exc)
 
-    def __save_to_file(self, filename):
-        with open(filename, 'w') as stream:
+    def save(self):
+        with open(KIWI_CONF_NAME, 'w') as stream:
             stream.write(str(self))
 
-    @classmethod
-    def default(cls):
-        result = cls()
-        result.__update_from_file(DEFAULT_KIWI_CONF_NAME)
 
-        with open(KIWI_ROOT + "/version-tag", 'r') as stream:
-            result.__yml_content["version"] = stream.read().strip()
-
-        return result
+class DefaultConfig(Config):
+    __instance = None
 
     @classmethod
-    def load(cls):
-        result = cls.default()
+    def get(cls):
+        if cls.__instance is None:
+            cls.__instance = cls()
+            cls.__instance._update_from_file(DEFAULT_KIWI_CONF_NAME)
+
+            with open(VERSION_TAG_NAME, 'r') as stream:
+                cls.__instance["version"] = stream.read().strip()
+
+        return cls.__instance
+
+
+class LoadedConfig(Config):
+    @classmethod
+    def get(cls):
+        result = DefaultConfig.get()
 
         if os.path.isfile(KIWI_CONF_NAME):
-            result.__update_from_file(KIWI_CONF_NAME)
+            result._update_from_file(KIWI_CONF_NAME)
 
         return result
-
-    def save(self):
-        self.__save_to_file(KIWI_CONF_NAME)

src/kiwi/runner.py

@@ -7,7 +7,8 @@ from .subcommands import *
 class Runner:
     __commands: List[SubCommand] = [
         InitCommand,
-        ShowCommand
+        ShowCommand,
+        LogsCommand
     ]
 
     @classmethod

src/kiwi/subcommands/__init__.py

@@ -1,6 +1,12 @@
-from .subcommand import SubCommand
+from ._utils import SubCommand
 
 from .init import InitCommand
 from .show import ShowCommand
+from .logs import LogsCommand
 
-__all__ = ['SubCommand', 'InitCommand', 'ShowCommand']
+__all__ = [
+    'SubCommand',
+    'InitCommand',
+    'ShowCommand',
+    'LogsCommand'
+]

src/kiwi/subcommands/_utils.py

@@ -0,0 +1,53 @@
+import subprocess
+
+from ..config import LoadedConfig
+
+
+class SubCommand:
+    @classmethod
+    def get_cmd(cls):
+        pass
+
+    @classmethod
+    def setup(cls):
+        pass
+
+    @classmethod
+    def run(cls):
+        pass
+
+
+class Docker:
+    __requires_root = None
+
+    @classmethod
+    def __check_requires_root(cls):
+        if cls.__requires_root is None:
+            try:
+                config = LoadedConfig.get()
+                subprocess.run(
+                    [config['executables:docker'], 'ps'],
+                    check=True,
+                    stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL
+                )
+                cls.__requires_root = False
+            except subprocess.CalledProcessError:
+                cls.__requires_root = True
+
+        return cls.__requires_root
+
+    @classmethod
+    def run_command(cls, program, args, cwd=None, env=None):
+        config = LoadedConfig.get()
+        cmd = [config['executables:' + program], *args]
+
+        if cls.__check_requires_root():
+            cmd = [config['executables:sudo'], *cmd]
+
+        print(cmd)
+        return subprocess.run(
+            cmd,
+            # stdout=subprocess.PIPE,
+            # stderr=subprocess.PIPE,
+            cwd=cwd, env=env
+        )

src/kiwi/subcommands/init.py

@@ -1,10 +1,10 @@
 import logging
 import os
 
-from kiwi.core import KIWI_CONF_NAME, Parser
-from kiwi.config import Config
+from ..core import KIWI_CONF_NAME, Parser
+from ..config import DefaultConfig
 
-from .subcommand import SubCommand
+from ._utils import SubCommand
 
 
 def user_input(config, key, prompt):
@@ -16,6 +16,25 @@ def user_input(config, key, prompt):
         config[key] = result
 
 
+def find_exe(program_name):
+    for path in os.environ["PATH"].split(os.pathsep):
+        exe_file = os.path.join(path, program_name)
+        if os.path.isfile(exe_file) and os.access(exe_file, os.X_OK):
+            return exe_file
+
+    return None
+
+
+def user_input_exe(config, program_name):
+    exe_file = find_exe(program_name)
+    key = 'executables:' + program_name
+
+    if exe_file is not None:
+        config[key] = exe_file
+    else:
+        user_input(config, key, "Enter path to '{}' executable".format(program_name))
+
+
 class InitCommand(SubCommand):
     __parser = None
 
@@ -30,19 +49,23 @@ class InitCommand(SubCommand):
 
     @classmethod
     def run(cls):
-        config = Config.default()
+        config = DefaultConfig.get()
 
         if os.path.isfile(KIWI_CONF_NAME):
             logging.warning("Overwriting existing '%s'!", KIWI_CONF_NAME)
 
         user_input(config, 'version', "Choose kiwi-config version")
 
+        user_input(config, 'runtime:storage', "Enter main directory for local data")
+
         user_input(config, 'markers:project', "Enter marker string for project directories")
         user_input(config, 'markers:down', "Enter marker string for disabled projects")
 
         user_input(config, 'network:name', "Enter name for local docker network")
         user_input(config, 'network:cidr', "Enter CIDR block for local docker network")
 
-        user_input(config, 'runtime:storage', "Enter main directory for local data")
+        user_input_exe(config, 'docker')
+        user_input_exe(config, 'docker-compose')
+        user_input_exe(config, 'sudo')
 
         config.save()

src/kiwi/subcommands/logs.py

@@ -0,0 +1,19 @@
+from ..core import Parser
+
+from ._utils import SubCommand, Docker
+
+
+class LogsCommand(SubCommand):
+    __parser = None
+
+    @classmethod
+    def get_cmd(cls):
+        return 'logs'
+
+    @classmethod
+    def setup(cls):
+        cls.__parser = Parser.get_subparsers().add_parser(cls.get_cmd(), help="Show logs of a project")
+
+    @classmethod
+    def run(cls):
+        print(Docker.run_command('docker-compose', ['logs', '-tf', '--tail=10'], cwd='hello-world.project', env={'COMPOSE_PROJECT_NAME': 'hello-world'}))

src/kiwi/subcommands/show.py

@@ -1,7 +1,7 @@
-from kiwi.config import Config
-from kiwi.core import Parser
+from ..config import LoadedConfig
+from ..core import Parser
 
-from .subcommand import SubCommand
+from ._utils import SubCommand
 
 
 class ShowCommand(SubCommand):
@@ -17,5 +17,5 @@ class ShowCommand(SubCommand):
 
     @classmethod
     def run(cls):
-        config = Config.load()
+        config = LoadedConfig.get()
         print(config)

src/kiwi/subcommands/subcommand.py

@@ -1,12 +0,0 @@
-class SubCommand:
-    @classmethod
-    def get_cmd(cls):
-        pass
-
-    @classmethod
-    def setup(cls):
-        pass
-
-    @classmethod
-    def run(cls):
-        pass