On 2019-08-08 at 06:56:14, Jonathan Nieder wrote:
> t1410.3 ("corrupt and checks") fails when run using dash versions
> before 0.5.8, with a cryptic message:
>
> mv: cannot stat '.git/objects//e84adb2704cbd49549e52169b4043871e13432': No such file or directory
>
> The function generating that path:
>
> test_oid_to_path () {
> echo "${1%${1#??}}/${1#??}"
> }
>
> which is supposed to produce a result like
>
> 12/3456789....
>
> But a dash bug[*] causes it to instead expand to
>
> /3456789...
>
> The stream of symbols that makes up this function is hard for humans
> to follow, too. The complexity mostly comes from the repeated use of
> the expression ${1#??} for the basename of the loose object. Use a
> variable instead --- nowadays, the dialect of shell used by Git
> permits local variables, so this is cheap.
>
> An alternative way to work around [*] is to remove the double-quotes
> around test_oid_to_path's return value. That makes the expression
> easier for dash to read, but harder for humans. Let's prefer the
> rephrasing that's helpful for humans, too.
>
> Noticed by building on Ubuntu trusty, which uses dash 0.5.7.
This seems like a sane, well-reasoned fix. I don't know if we care about
building on Ubuntu trusty (since it is EOL), but if we do, then we
should definitely take this patch.
I agree it makes things easier to follow as well, which is also nice,
and it preserves the shell-only nature that's so desirable on Windows.
--
brian m. carlson: Houston, Texas, US
OpenPGP: https://keybase.io/bk2204
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