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List:       busybox
Subject:    Fwd: Piping to functions in busybox hush shell with NOMMU CPU
From:       Konstantin Lazarev <cnlazarev () gmail ! com>
Date:       2015-08-28 19:36:37
Message-ID: CABwJm7ZKhqcrGQrqKp15T=_qW6nc-74_E52==CmUN2UxSv6aqQ () mail ! gmail ! com
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Hello,

I have issue with busybox hash built for NOMMU CPU.

I am experiencing a problem with different behaviour of piping between
functions in script when using hush on NOMMU platform and ash shells on MMU
platform running busybox 1.23.2.

I have test script which is called with parameter:
./script.sh /tmp
And in hush following script is getting stuck.
With debug output added to read implementation I figured out that it is
stuck because "read" in test_method function is getting stdin from console
instead of piping from calling code:
-------------------------------------------------------------
#!/bin/sh

test_method()
{
  while read p; do
    echo "$p"
  done
}

do_ls()
{
  ls -1RF "$1" | test_method
}


processArgs()
{
  do_ls "$1"
}

processArgs "$@" | sort -u
-------------------------------------------------------------

The same script works as expected in busybox ash shell.

And it works in busybox hush if last sort is removed.
Also in busybox hush if I do the same without functions with following
commands it works fine too:
ls -1RF /tmp | while read p; do echo "$p"; done | sort -u

It seems that issue is in hush NOMMU implementation in the case when piping
happens to a function.

Can anybody to be so kind to give me idea how fix this problem without
changing test script?

Thank you,
Konstantin Lazarev.

[Attachment #5 (text/html)]

<div dir="ltr">Hello,<br><div class="gmail_quote"><div \
dir="ltr"><div><br></div><div>I have issue with busybox hash built for NOMMU \
CPU.<br><br></div><div>I am experiencing a problem with different behaviour of piping \
between functions in script when using hush on NOMMU platform and ash shells on MMU \
platform running  busybox 1.23.2.<br></div><div><br>I have test script which is \
called with parameter:<br></div><div>./script.sh /tmp<br></div>And in hush following \
script is getting stuck.<br><div>With debug output added to read implementation I \
figured out that it is stuck because &quot;read&quot; in test_method function is \
getting stdin from console instead of piping from calling \
code:<br>-------------------------------------------------------------<br>#!/bin/sh<br><br>test_method()<br>{<br> \
while read p; do<br>       echo &quot;$p&quot;<br>   \
done<br>}<br><br>do_ls()<br>{<br>   ls -1RF &quot;$1&quot; | \
test_method<br>}<br><br><br>processArgs()<br>{<br>   do_ls \
&quot;$1&quot;<br>}<br><br>processArgs &quot;$@&quot; | sort \
-u<br>-------------------------------------------------------------<br><br></div><div>The \
same script works as expected in busybox ash shell.<br><br></div><div>And it works in \
busybox hush if last sort is removed.<br></div><div>Also in busybox hush if I do the \
same without functions with following commands it works fine too:<br>ls -1RF /tmp | \
while read p; do echo &quot;$p&quot;; done | sort -u<br><br></div><div>It seems that \
issue is in hush NOMMU implementation in the case when piping happens to a \
function.<br><br></div><div>Can anybody to be so kind to give me idea how fix this \
problem without changing test script?<br><br></div><div>Thank \
you,<br></div><div>Konstantin Lazarev.<br></div></div> </div><br></div>



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