Validate repository directory ownership (v1.3) #6268
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GitHub is removing support for the unauthenticated git protocol; test with the https protocol.
Provide individual file ownership checks for both the current user and the system user, as well as a combined current user and system user check.
Ensure that the repository directory is owned by the current user; this prevents us from opening configuration files that may have been created by an attacker.
Provide a mock for file ownership for testability.
Test that we prevent opening directories that are not owned by ourselves.
Pull the global configuration loader out of the symlink check so that it can be re-used.
Obey the `safe.directory` configuration variable if it is set in the global or system configuration. (Do not try to load this from the repository configuration - to avoid malicious repositories that then mark themselves as safe.)
Introduce the `GIT_OPT_SET_OWNER_VALIDATION` option, so that users can disable repository ownership validation.
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Backport of #6266 to the v1.3 branch.