Re: [PATCH v3] t6020: fix incompatible parameter expansion

On Thu, Jun 17 2021, Jiang Xin wrote:

Ævar reported that the function `make_user_friendly_and_stable_output()`
failed on a i386 box (gcc45) in the gcc farm boxes with error:

    sed: couldn't re-allocate memory

It turns out that older versions of bash (4.3) or dash (0.5.7) cannot
evaluate expression like `${A%${A#???????}}` used to get the leading 7
characters of variable A.

Replace the incompatible parameter expansion so that t6020 works on
older version of bash or dash.

Reported-by: Ævar Arnfjörð Bjarmason <redacted>
Signed-off-by: Jiang Xin <redacted>
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For what it's worth I've also tested this v3 on gcc45, it works too.