[oe] [STABLE] [PATCH] base.bbclass: Replace os.system with subprocess call.

[Philip Balister]

Acked-by: Philip Balister <philip at balister.org>

On 11/21/2009 03:52 PM, Cory Maccarrone wrote:
> (This patch is being submitted on behalf of Khem Raj.  I am not the original
> author, nor do I claim any part of this work.)
> --------------
>
> Often gzip is reporting broken pipe errors with do_unpack of
> tar.gz files.
>
> If you use the commands described above to extract a tar.gz file, gzip
> sometimes emits a Broken pipe error message. This can safely be ignored
> if tar extracted all files without any other error message.
>
> We do not let python install its SIGPIPE handler and use subprocess call
> to invoke the command.
>
> This is based on the following python bug report.
> http://bugs.python.org/issue1652
>
> Signed-off-by: Khem Raj<raj.khem at gmail.com>
> ---
>   classes/base.bbclass |    9 +++++++--
>   1 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/classes/base.bbclass b/classes/base.bbclass
> index e622aee..69d1979 100644
> --- a/classes/base.bbclass
> +++ b/classes/base.bbclass
> @@ -716,9 +716,14 @@ base_do_buildall() {
>   	:
>   }
>
> +def subprocess_setup():
> +	import signal, subprocess
> +	# Python installs a SIGPIPE handler by default. This is usually not what
> +	# non-Python subprocesses expect.
> +	signal.signal(signal.SIGPIPE, signal.SIG_DFL)
>
>   def oe_unpack_file(file, data, url = None):
> -	import bb, os
> +	import bb, os, signal, subprocess
>   	if not url:
>   		url = "file://%s" % file
>   	dots = file.split(".")
> @@ -787,7 +792,7 @@ def oe_unpack_file(file, data, url = None):
>
>   	cmd = "PATH=\"%s\" %s" % (bb.data.getVar('PATH', data, 1), cmd)
>   	bb.note("Unpacking %s to %s/" % (base_path_out(file, data), base_path_out(os.getcwd(), data)))
> -	ret = os.system(cmd)
> +	ret = subprocess.call(cmd, preexec_fn=subprocess_setup, shell=True)
>
>   	os.chdir(save_cwd)
>