Re: [PATCH 2/3] var: add attributes files locations

> Currently, there are some programs which would like to read and parse
> the gitattributes files at the global or system levels.  However, it's
> not always obvious where these files live, especially for the system
> file, which may have been hard-coded at compile time or computed
> dynamically based on the runtime prefix.
>
> It's not reasonable to expect all callers of Git to intuitively know
> where the Git distributor or user has configured these locations to
> be, so add some entries to allow us to determine their location.  Honor
> the GIT_ATTR_NOSYSTEM environment variable if one is specified.  Expose
> the accessor functions in a way that we can reuse them from within the
> var code.
>
> In order to make our paths consistent on Windows and also use the same
> form as paths use in "git rev-parse", let's normalize the path before we
> return it.  This results in Windows-style paths that use slashes, which
> is convenient for making our tests function in a consistent way across
> platforms.  Note that this requires that some of our values be freed, so
> let's add a flag about whether the value needs to be freed and use it
> accordingly.
>
> Signed-off-by: brian m. carlson <bk2204@github.com>
> ---
> diff --git a/t/t0007-git-var.sh b/t/t0007-git-var.sh
> @@ -159,6 +159,26 @@ test_expect_success MINGW 'GIT_SHELL_PATH points to a suitable shell' '
> +test_expect_success 'GIT_ATTR_SYSTEM points to the correct location' '
> +       test_must_fail env GIT_ATTR_NOSYSTEM=1 git var GIT_ATTR_SYSTEM &&
> +       (
> +               sane_unset GIT_ATTR_NOSYSTEM &&
> +               git var GIT_ATTR_SYSTEM >path &&
> +               test "$(cat path)" != ""
> +       )
> +'

> +       (
> +               sane_unset XDG_CONFIG_HOME &&
> +               HOME="$TRASHDIR" git var GIT_ATTR_GLOBAL >path &&
> +               test "$(cat path)" = "$TRASHDIR/.config/git/attributes"
> +       )