Profpatsch 0e444785a1 installer/tools/get-version-suffix: set --git-dir ...

The `nixos-rebuild` tool calls `get-version-suffix` to figure out the
git revision of the nixpkgs directory if there is a .git.

https://nvd.nist.gov/vuln/detail/CVE-2022-24765 made git throw an
error if the .git search logic is not turned off and a user
tries to access a `.git` directory they don’t own (otherwise a
different user could trick them into setting arbitrary git config).

So from now on we should always explicitely set `--git-dir`, which
turns this search logic (and thus the security check) off.

2022-06-27 14:28:03 +02:00

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