[OE-core] [PATCH] icecc.bbclass: replace os.popen with subprocess.check_output

[Leonardo Sandoval]

On 06/14/2016 09:03 AM, Martin Jansa wrote:
> * otherwise there is a lot of warnings about missing close on file descriptor
>
> Signed-off-by: Martin Jansa <Martin.Jansa at gmail.com>
> ---
>   meta/classes/icecc.bbclass | 14 ++++++++++----
>   1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/meta/classes/icecc.bbclass b/meta/classes/icecc.bbclass
> index e1c06c4..cb44007 100644
> --- a/meta/classes/icecc.bbclass
> +++ b/meta/classes/icecc.bbclass
> @@ -47,7 +47,8 @@ def get_cross_kernel_cc(bb,d):
>   
>       # evaluate the expression by the shell if necessary
>       if '`' in kernel_cc or '$(' in kernel_cc:
> -        kernel_cc = os.popen("echo %s" % kernel_cc).read()[:-1]
> +        import subprocess
There are two imports like this, would it make sense to place just once 
on top?

Also, now that we switch to subprocess.check_output, I wonder if we need 
to convert it to string (the output of this method) before proceeding.
> +        kernel_cc = subprocess.check_output("echo %s" % kernel_cc, shell=True)
>   
>       kernel_cc = d.expand(kernel_cc)
>       kernel_cc = kernel_cc.replace('ccache', '').strip()
> @@ -220,9 +221,14 @@ def icecc_get_and_check_tool(bb, d, tool):
>       # PATH or icecc-create-env script will silently create an invalid
>       # compiler environment package.
>       t = icecc_get_tool(bb, d, tool)
> -    if t and os.popen("readlink -f %s" % t).read()[:-1] == get_icecc(d):
> -        bb.error("%s is a symlink to %s in PATH and this prevents icecc from working" % (t, get_icecc(d)))
> -        return ""
> +    if t:
> +        import subprocess
> +        link_path = subprocess.check_output("readlink -f %s" % t, shell=True)
> +        if link_path == get_icecc(d):
> +            bb.error("%s is a symlink to %s in PATH and this prevents icecc from working" % (t, get_icecc(d)))
> +            return ""
> +        else:
> +            return t
>       else:
>           return t
>