In posix, a command like "echo 'foo bar'" would previously get parsed
out into arguments for execve like [ "echo", "'foo", "bar'" ] which
obviously isn't what you want. After this commit, it sticks the whole
thing in an arg to sh so the execve call ends up looking like
execve("/bin/sh", ["sh", "-c", "echo 'foo bar'"], [/* 26 vars */]) = 0
This is still a little less than ideal because shell escapes become a
problem; fortunately, that's easy to deal with on the client side as
long as module developers take it into account.
73331b66e6