validate that git is installed before executing any command.

[GuyAfik]

Related Issues

fixes: https://jira-hq.paloaltonetworks.local/browse/XSUP-27651

Description

1. validate that git is installed before executing any command and if not exit gracefully
2. make sure that for git operations we will only use the GitUtil class and not Repo class to manage git operations anymore.
3. add a ruff rule to prevent devs to import git.repo, but instead use GitUtil class

[dorschw]

See GitUtil, we (re)raise InvalidGitRepositoryError, better handle it there.

[GuyAfik]

however, we have several places that we just the Repo class from github-python and not the GitUtil object.
In order words we do not use only the GitUtil class for git stuff.

[GuyAfik]

Its not possible to do it in GitUtil as we import git module in __main__.py and if git is not installed, its not possible to import git at all, an ImportError exception will be raised.

The SDK crashes over it

Traceback (most recent call last):
  File "/usr/local/bin/demisto-sdk", line 5, in <module>
    from demisto_sdk.__main__ import main
  File "/usr/local/lib/python3.10/site-packages/demisto_sdk/__main__.py", line 11, in <module>
    import git
  File "/usr/local/lib/python3.10/site-packages/git/__init__.py", line 91, in <module>
    raise ImportError("Failed to initialize: {0}".format(_exc)) from _exc
ImportError: Failed to initialize: Bad git executable

[GuyAfik]

basically it crashes when the first git imported is reached (which happens in __main__.py)

[dorschw]

Very nice

[dorschw]

Suggested change

logger.debug(f"Using content path: {content_path}")

let's move the log line into the GitUtil constructor, f"GitUtil: using {content_path=}"

[GuyAfik]

can't use logger in GitUtil due to circular import :(
we have standard to use the logger from demisto_sdk.commands.common.logger?
or may i use the logger from logging module..
i prefer to keep our standards

[coveralls]

Pull Request Test Coverage Report for Build d8ebd8bc-7655-4401-8f31-5c017b0dfead

• 38 of 44 (86.36%) changed or added relevant lines in 13 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.004%) to 81.167%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
demisto_sdk/commands/common/hook_validations/content_entity_validator.py	0	1	0.0%
demisto_sdk/commands/common/hook_validations/graph_validator.py	0	1	0.0%
demisto_sdk/commands/common/tools.py	6	7	85.71%
demisto_sdk/commands/create_artifacts/content_artifacts_creator.py	0	1	0.0%
demisto_sdk/commands/common/content/content.py	10	12	83.33%

Totals
Change from base Build dede1326-2d45-485f-ba20-3b64febbac6a:	-0.004%
Covered Lines:	31967
Relevant Lines:	39384

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💛 - Coveralls