561 lines
16 KiB
Python
561 lines
16 KiB
Python
# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
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# SPDX-FileCopyrightText: Copyright (c) 2020 Melissa LeBlanc-Williams for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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`adafruit_shell`
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================================================================================
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Python helper for running Shell scripts in Python
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* Author(s): Melissa LeBlanc-Williams
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Implementation Notes
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--------------------
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**Software and Dependencies:**
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* Linux
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"""
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# imports
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import sys
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import os
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import shutil
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import subprocess
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import platform
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import fileinput
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import re
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from datetime import datetime
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from clint.textui import colored, prompt
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import adafruit_platformdetect
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__version__ = "0.0.0-auto.0"
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__repo__ = "https://github.com/adafruit/Adafruit_Python_Shell.git"
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# pylint: disable=too-many-public-methods
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class Shell:
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"""
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Class to help with converting Shell scripts over to Python. Having all
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the functions in one place makes updates easier and code shorter.
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"""
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def __init__(self):
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self._group = None
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self._dirstack = []
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@staticmethod
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def select_n(message, selections):
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"""
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Display a list of selections for the user to enter
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"""
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options = []
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for index, selection in enumerate(selections):
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options.append(
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{"selector": str(index + 1), "prompt": selection, "return": index + 1,}
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)
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return prompt.options(message, options)
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def run_command(self, cmd, suppress_message=False, return_output=False):
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"""
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Run a shell command and show the output as it runs
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"""
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original_stdout = sys.stdout
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original_stderr = sys.stderr
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try:
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proc = subprocess.Popen(
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cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE
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)
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full_output = ""
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while True:
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output = proc.stdout.readline()
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err = proc.stderr.read()
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if err and not suppress_message:
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self.error(err.decode("utf-8", errors="ignore"))
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if len(output) == 0 and proc.poll() is not None:
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break
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if output:
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decoded_output = output.decode("utf-8", errors="ignore").strip()
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if not suppress_message:
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self.info(decoded_output)
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full_output += decoded_output
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except Exception as err: # pylint: disable=broad-except
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pass
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finally:
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sys.stdout = original_stdout
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sys.stderr = original_stderr
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if return_output:
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return full_output
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r = proc.poll()
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if r == 0:
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return True
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return False
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def info(self, message):
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"""
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Display a message with the group in green
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"""
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if self._group is not None:
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print(colored.green(self._group) + " " + message)
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else:
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print(message)
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def warn(self, message):
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"""
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Display a message with the group in yellow
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"""
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if self._group is not None:
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print(colored.yellow(self._group) + " " + message)
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else:
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print(message)
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def bail(self, message=None):
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"""
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Exit and display an error message if given
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"""
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if message is None:
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self.error("Exiting due to error")
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else:
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self.error("Exiting due to error: {}".format(message))
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sys.exit(1)
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def error(self, message):
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"""
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Display some inforrmation
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"""
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if self._group is not None:
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print(colored.red(self._group) + " " + message)
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else:
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print(message)
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@staticmethod
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def print_colored(message, color):
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"""Print out a message in a specific color"""
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colors = ("red", "green", "yellow", "blue", "black", "magenta", "cyan", "white")
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if color in colors:
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colorize = getattr(colored, color)
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print(colorize(message))
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def prompt(self, message, *, default=None, force_arg=None):
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"""
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A Yes/No prompt that accepts optional defaults
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Returns True for Yes and False for No
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"""
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if force_arg is not None and self.argument_exists(force_arg):
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return True
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if default is None:
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choicebox = "[y/n]"
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else:
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if default not in ["y", "n"]:
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default = "y"
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choicebox = "[Y/n]" if default == "y" else "[y/N]"
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while True:
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reply = input(message + " " + choicebox + " ").strip()
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if reply == "" and default is not None:
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return default == "y"
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if re.match("y(?:es)?", reply, re.I):
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return True
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if re.match("n(?:o)?", reply, re.I):
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return False
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@staticmethod
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def clear():
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"""
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Clear the screen
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"""
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os.system("clear")
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@staticmethod
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def reboot():
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"""
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Reboot the system
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"""
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os.system("reboot")
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@staticmethod
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def getcwd():
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"""
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Get the Current Working Directory
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"""
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return os.getcwd()
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def chdir(self, directory):
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"""
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Change directory
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"""
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# if directory[0] != "/" and directory[0] != ".":
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# directory = self.getcwd() + "/" + directory
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directory = self.path(directory)
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if not self.exists(directory):
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raise ValueError("Directory does not exist")
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if not self.isdir(directory):
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raise ValueError("Given location is not a directory")
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os.chdir(directory)
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def pushd(self, directory):
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"""
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Change directory
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"""
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# Add current dir to stack
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self._dirstack.append(self.getcwd())
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# change dir
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self.chdir(directory)
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def popd(self):
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"""
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Change directory
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"""
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# Add current dir to stack
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if len(self._dirstack) > 0:
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directory = self._dirstack.pop()
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self.chdir(directory)
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else:
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raise RuntimeError("Directory stack empty")
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@staticmethod
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def path(file_path):
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"""
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Return the relative path. This works for paths starting with ~
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"""
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return os.path.expanduser(file_path)
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@staticmethod
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def home_dir():
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"""
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Return the User's home directory
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"""
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return os.path.expanduser("~")
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@staticmethod
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def is_root():
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"""
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Return whether the current user is logged in as root or has super user access
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"""
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return os.geteuid() == 0
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@staticmethod
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def script():
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"""
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Return the name of the script that is running
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"""
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return sys.argv[0]
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def grep(self, search_term, location):
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"""
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Run the grep command and return the result
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"""
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location = self.path(location)
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return self.run_command(
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"grep {} {}".format(search_term, location), suppress_message=True
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)
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@staticmethod
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def date():
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"""
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Return a string containing the current date and time
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"""
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return datetime.now().ctime()
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def reconfig(self, file, pattern, replacement):
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"""
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Given a filename, a regex pattern to match and a replacement string,
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perform replacement if found, else append replacement to end of file.
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"""
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if not self.isdir(file):
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if self.pattern_search(file, pattern):
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# Pattern found; replace in file
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self.pattern_replace(file, pattern, replacement)
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else:
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# Not found; append (silently)
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self.write_text_file(file, replacement, append=True)
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def pattern_search(self, location, pattern, multi_line=False):
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"""
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Similar to grep, but uses pure python
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multi_line will search the entire file as a large text glob,
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but certain regex patterns such as ^ and $ will not work on a
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line-by-line basis
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returns True/False if found
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"""
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location = self.path(location)
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found = False
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if self.exists(location) and not self.isdir(location):
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if multi_line:
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with open(location, "r+") as file:
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if re.search(pattern, file.read(), flags=re.DOTALL):
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found = True
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else:
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for line in fileinput.FileInput(location):
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if re.search(pattern, line):
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found = True
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return found
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def pattern_replace(self, location, pattern, replace="", multi_line=False):
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"""
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Similar to sed, but uses pure python
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multi_line will search the entire file as a large text glob,
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but certain regex patterns such as ^ and $ will not work on a
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line-by-line basis
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"""
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location = self.path(location)
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if self.pattern_search(location, pattern, multi_line):
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if multi_line:
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regex = re.compile(pattern, flags=re.DOTALL)
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with open(location, "r+") as file:
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data = file.read()
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file.seek(0)
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file.write(regex.sub(replace, data))
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file.truncate()
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file.close()
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else:
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regex = re.compile(pattern)
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for line in fileinput.FileInput(location, inplace=True):
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if re.search(pattern, line):
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print(regex.sub(replace, line), end="")
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else:
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print(line, end="")
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def isdir(self, location):
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"""
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Check if a location exists and is a directory
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"""
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location = self.path(location)
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return os.path.exists(location) and os.path.isdir(location)
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def exists(self, location):
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"""
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Check if a path or file exists
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"""
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location = self.path(location)
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return os.path.exists(location)
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def move(self, source, destination):
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"""
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Move a file or directory from source to destination
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"""
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source = self.path(source)
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destination = self.path(destination)
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if os.path.exists(source):
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if not os.path.isdir(source) and os.path.isdir(destination):
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destination += os.sep + os.path.basename(source)
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shutil.move(source, destination)
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def copy(self, source, destination):
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"""
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Move a file or directory from source to destination
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"""
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source = self.path(source)
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destination = self.path(destination)
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if os.path.exists(source):
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if os.path.isdir(source):
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shutil.copytree(source, destination)
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else:
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if os.path.isdir(destination):
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destination += os.sep + os.path.basename(source)
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shutil.copy(source, destination)
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def remove(self, location):
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"""
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Remove a file or directory if it exists
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"""
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location = self.path(location)
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if os.path.exists(location):
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if os.path.isdir(location):
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shutil.rmtree(location)
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else:
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os.remove(location)
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def require_root(self):
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"""
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Check if the current user has root access and exit if not.
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"""
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if not self.is_root():
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print("Installer must be run as root.")
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print("Try 'sudo python3 {}'".format(self.script()))
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sys.exit(1)
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def write_text_file(self, path, content, append=True):
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"""
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Write the contents to a file at the specified path
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"""
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if append:
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mode = "a"
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content = "\n" + content
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else:
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mode = "w"
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service_file = open(self.path(path), mode)
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service_file.write(content)
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service_file.close()
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@staticmethod
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def is_python3():
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"Check if we are running Python 3 or later"
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return int(platform.python_version()[0]) >= 3
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@staticmethod
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def is_linux():
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"""
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Check that we are running linux
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"""
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return platform.system() == "Linux" or platform.system() == "Darwin"
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@staticmethod
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def is_armhf():
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"""
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Check if Platform.machine() (same as uname -m) returns an ARM platform that
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supports hardware floating point
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"""
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return bool(re.match("armv.l", platform.machine()))
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@staticmethod
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def is_armv6():
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"""
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Check if Platform.machine() returns ARM v6
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"""
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return platform.machine() == "armv6l"
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@staticmethod
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def is_armv7():
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"""
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Check if Platform.machine() returns ARM v7
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"""
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return platform.machine() == "armv7l"
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@staticmethod
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def is_armv8():
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"""
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Check if Platform.machine() returns ARM v8
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"""
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return platform.machine() == "armv8l"
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@staticmethod
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def get_arch():
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"""Return a string containing the architecture"""
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return platform.machine()
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# pylint: disable=invalid-name
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def get_os(self):
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"""Return a string containing the release which we can use to compare in the script"""
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os_releases = (
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"Raspbian",
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"Debian",
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"Kano",
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"Mate",
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"PiTop",
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"Ubuntu",
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"Darwin",
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"Kali",
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)
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release = None
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if os.path.exists("/etc/os-release"):
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with open("/etc/os-release") as f:
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if "Raspbian" in f.read():
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release = "Raspbian"
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if self.run_command("command -v apt-get", suppress_message=True):
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with open("/etc/os-release") as f:
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release_file = f.read()
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for opsys in os_releases:
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if opsys in release_file:
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release = opsys
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if os.path.isdir(os.path.expanduser("~/.kano-settings")) or os.path.isdir(
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os.path.expanduser("~/.kanoprofile")
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):
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release = "Kano"
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if os.path.isdir(os.path.expanduser("~/.config/ubuntu-mate")):
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release = "Mate"
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if platform.system() == "Darwin":
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release = "Darwin"
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return release
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def get_raspbian_version(self):
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"""Return a string containing the raspbian version"""
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if self.get_os() != "Raspbian":
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return None
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raspbian_releases = ("buster", "stretch", "jessie", "wheezy")
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if os.path.exists("/etc/os-release"):
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with open("/etc/os-release") as f:
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release_file = f.read()
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if "/sid" in release_file:
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return "unstable"
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for raspbian in raspbian_releases:
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if raspbian in release_file:
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return raspbian
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return None
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# pylint: enable=invalid-name
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@staticmethod
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def is_raspberry_pi():
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"""
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Use PlatformDetect to check if this is a Raspberry Pi
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"""
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detector = adafruit_platformdetect.Detector()
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return detector.board.any_raspberry_pi
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@staticmethod
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def get_board_model():
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"""
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Use PlatformDetect to get the board model
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"""
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detector = adafruit_platformdetect.Detector()
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return detector.board.id
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@staticmethod
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def get_architecture():
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"""
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Get the type of Processor
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"""
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return platform.machine()
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@staticmethod
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def kernel_minimum(version):
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"""
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Check that we are running on at least the specified version
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"""
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return platform.release() >= str(version)
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@staticmethod
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def release():
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"""
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Return the latest kernel release version
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"""
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return platform.release()
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def argument_exists(self, arg, prefix="-"):
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"""
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Check if the given argument was supplied
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"""
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return prefix + arg in self.args
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@staticmethod
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def exit(status_code=0):
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"""
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Exit and return the status code to the OS
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"""
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sys.exit(status_code)
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@property
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def group(self):
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"""
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Get or set the current group that is displayed in color along with messages
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"""
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return self._group
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@group.setter
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def group(self, value):
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self._group = str(value)
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@property
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def args(self):
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"""
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Get a list of supplied arguments
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"""
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return sys.argv
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