mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-11-05 23:51:21 +00:00
142 lines
4.1 KiB
Python
142 lines
4.1 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
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# All Rights Reserved. See LICENSE file for details.
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import re
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from subprocess import run
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from getpass import getuser
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from os.path import isdir
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from datetime import datetime
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class SnapshotProvider:
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def __init__(self, directory, git_dir):
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author = f'{getuser()} via TFW {self.__class__.__name__}'
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self.gitenv = {
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'GIT_DIR': git_dir,
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'GIT_WORK_TREE': directory,
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'GIT_AUTHOR_NAME': author,
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'GIT_AUTHOR_EMAIL': '',
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'GIT_COMMITTER_NAME': author,
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'GIT_COMMITTER_EMAIL': '',
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'GIT_PAGER': 'cat'
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}
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self._check_environment()
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self.__last_valid_branch = self._branch
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self._init_repo_if_needed()
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def _check_environment(self):
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if not isdir(self.gitenv['GIT_DIR']) or not isdir(self.gitenv['GIT_WORK_TREE']):
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raise EnvironmentError('Directories "directory" and "git_dir" must exist!')
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if self._head_detached:
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raise EnvironmentError(f'{self.__class__.__name__} cannot init from detached HEAD state!')
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def _init_repo_if_needed(self):
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if not self._repo_is_initialized():
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self._run(('git', 'init'))
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def _repo_is_initialized(self):
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return self._run(('git', 'status')).returncode == 0
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def take_snapshot(self):
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if self._head_detached:
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self._checkout_new_branch_from_head()
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self._run(('git', 'add', '-A'))
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self._run(('git', 'commit', '-m', 'Snapshot'))
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def _checkout_new_branch_from_head(self):
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head_hash = self._get_head_hash()
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self._run((
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'git', 'checkout',
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'-b', head_hash, head_hash
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))
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def _get_head_hash(self):
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return self._get_stdout(('git', 'rev-parse', 'HEAD'))
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def restore_snapshot(self, date):
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commit = self._get_commit_from_timestamp(date)
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self._checkout(commit)
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def _get_commit_from_timestamp(self, date):
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return self._get_stdout((
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'git', 'rev-list',
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'--date=iso',
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'-n', '1',
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f'--before="{date.isoformat()}"',
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self._last_valid_branch
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))
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def _checkout(self, what):
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self._run((
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'git', 'checkout',
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what
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))
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def _get_stdout(self, *args, **kwargs):
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kwargs['capture_output'] = True
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stdout_bytes = self._run(*args, **kwargs).stdout
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return stdout_bytes.decode().rstrip('\n')
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def _run(self, *args, **kwargs):
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kwargs['check'] = True
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if 'env' not in kwargs:
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kwargs['env'] = self.gitenv
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return run(*args, **kwargs)
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@property
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def all_timelines(self):
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return self._branches
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@property
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def _branches(self):
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git_branch_output = self._get_stdout(('git', 'branch'))
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regex_pattern = re.compile(r'(?:[^\S\n]|[*])') # matches '*' and non-newline whitespace chars
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return re.sub(regex_pattern, '', git_branch_output).splitlines()
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@property
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def timeline(self):
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return self._branch
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@property
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def _branch(self):
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return self._get_stdout((
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'git', 'rev-parse',
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'--abbrev-ref', 'HEAD'
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))
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@property
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def _last_valid_branch(self):
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current_branch = self._branch
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if current_branch != 'HEAD':
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self.__last_valid_branch = current_branch
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return self.__last_valid_branch
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@property
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def _head_detached(self):
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return self._branch == 'HEAD'
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@timeline.setter
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def timeline(self, value):
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self._checkout(value)
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@property
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def snapshots(self):
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return self._pretty_log_branch()
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def _pretty_log_branch(self):
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git_log_output = self._get_stdout((
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'git', 'log',
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'--pretty=%H@%aI'
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))
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commits = []
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for line in git_log_output.splitlines():
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commit_hash, timestamp = line.split('@')
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commits.append({
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'hash': commit_hash,
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'timestamp': datetime.fromisoformat(timestamp)
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})
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return commits
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