[Toybox] [PATCH] cpio: fixes for Android kernel build.

[Rob Landley]

On 8/19/20 6:05 PM, enh wrote:
>     Where's this bug? It's not in the vanilla linux as of yesterday?
> 
> https://android.googlesource.com/kernel/common/+/refs/heads/android-mainline/kernel/gen_kheaders.sh#71

Sigh. WHY is that not in scripts? Ok.

Does the attached patch look like the start of a good fix? It lets you add ~ to
the start of optstr to give every -x option the parsing behavior of "tar xvjf".

(Which I _think_ is the unix v6 semantics from 1975, which cpio seems to retain
for some reason.)

That means "cpio -pd out" should work and "cpio out -pd" should provide an error
message.

  $ ./cpio -pd out
  cpio: chdir 'out': No such file or directory
  ^C
  $ ./cpio out -pd
  cpio: Missing argument to -p (see "cpio --help")

Which looks like there's a seperate bug that the receive side ends and the send
side doesn't immediately notice, but presumably it would if we fed it some data
so it unblocked...

  $ echo xiphoid | ./cpio -pd out
  cpio: chdir 'out': No such file or directory

Yeah, that exits. Close enough, I'm probably ok with that behavior.

Rob
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