Fixes for CVE 2022-29187#6349
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To match git's behavior with CVE 2022-29187, validate not only the working directory, but also the gitdir and gitlink (if it exists). This a follow up to CVE-2022-24765 that was fixed earlier.
In the ownership checks implemented for CVE-2022-24765, we disallowed users to access their own repositories when running with `sudo`. Examine the `SUDO_UID` environment variable and allow users running with `sudo`. This matches git's behavior.
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Forward porting the v1.3.2 / v1.4.4 fixes for CVE 2022-29187.
A fix for compatibility with git's (new) behavior for CVE 2022-24765 allows users on POSIX systems to access a git repository that is owned by them when they are running in
sudo.A fix for further compatibility with git's (existing) behavior for CVE 2022-24765 allows users on Windows to access a git repository that is owned by the Administrator when running with escalated privileges (using
runas Administrator).