Re: [PATCH v2 11/12] t0610: fix non-portable variable assignment

> Older versions of the Dash shell fail to parse `local var=val`
> assignments in some cases when `val` is unquoted. Such failures can be
> observed e.g. with Ubuntu 20.04 and older, which has a Dash version that
> still has this bug.
>
> Such an assignment has been introduced in t0610. The issue wasn't
> detected for a while because this test used to only run when the
> GIT_TEST_DEFAULT_REF_FORMAT environment variable was set to "refatble".
> We have dropped that requirement now though, meaning that it runs
> unconditionally, inclluding on jobs which use such older versions of
> Ubuntu.

> We have worked around such issues in the past, e.g. in ebee5580ca
> (parallel-checkout: avoid dash local bug in tests, 2021-06-06), by
> quoting the `val` side. Apply the same fix to t0610.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>