Eric Sunshine <sunsh...@sunshineco.com> writes:
> The --chain-lint option detects broken &&-chains by forcing the test to
> exit early (as the very first step) with a sentinel value. If that
> sentinel is the test's overall exit code, then the &&-chain is intact;
> if not, then the chain is broken. Unfortunately, this detection does not
> extend to &&-chains within subshells even when the subshell itself is
> properly linked into the outer &&-chain.
>
> Address this shortcoming by eliminating the subshell during the
> "linting" phase and incorporating its body directly into the surrounding
> &&-chain. To keep this transformation cheap, no attempt is made at
> properly parsing shell code. Instead, the manipulations are purely
> textual. For example:
>
> statement1 &&
> (
> statement2 &&
> statement3
> ) &&
> statement4
>
> is transformed to:
>
> statement1 &&
> statement2 &&
> statement3 &&
> statement4
so, with --chain-lint, we would transform this
mkdir -p a/b/c &&
(
cd a/b/c
rm -fr ../../*
) &&
statement 4
into this sequence
(exit $sentinel) &&
mkdir -p a/b/c &&
cd a/b/c
rm -fr ../../* &&
statement 4
and then rely on the non-zero exit to cancel all the remainder?
We didn't create nor cd to the t/trash$num/a/b/c thanks to the &&
chain, and end up running rm -fr ../../* from inside t/trash$num?
Hmmmmm....
