[PATCH] bin: Hide os.fork() deprecation warning at module level

[PATCH] bin: Hide os.fork() deprecation warning at module level

[Mathieu Dubois-Briand]

Add the message filtering directly in the python module where the error
happens, so we do not need to repeat the filter in all consumers. This
will also make sure the filter is applied in any user of createDaemon().

Fixes [YOCTO #16080]

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Suggested-by: Chen Qi <Qi.Chen@windriver.com>
---
 bin/bitbake         | 1 -
 bin/bitbake-layers  | 1 -
 bin/bitbake-server  | 1 -
 bin/bitbake-worker  | 1 -
 lib/bb/daemonize.py | 3 +++
 5 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/bin/bitbake b/bin/bitbake
index 2eb5f9103d31..a995bd665352 100755
--- a/bin/bitbake
+++ b/bin/bitbake
@@ -14,7 +14,6 @@ import os
 import sys
 import warnings
 warnings.simplefilter("default")
-warnings.filterwarnings("ignore", category=DeprecationWarning, message=".*use.of.fork.*may.lead.to.deadlocks.in.the.child.*")
 
 sys.path.insert(0, os.path.join(os.path.dirname(os.path.dirname(__file__)),
                                 'lib'))
diff --git a/bin/bitbake-layers b/bin/bitbake-layers
index 37c196226cbe..c49a5f30eef4 100755
--- a/bin/bitbake-layers
+++ b/bin/bitbake-layers
@@ -16,7 +16,6 @@ import sys
 import argparse
 import warnings
 warnings.simplefilter("default")
-warnings.filterwarnings("ignore", category=DeprecationWarning, message=".*use.of.fork.*may.lead.to.deadlocks.in.the.child.*")
 
 bindir = os.path.dirname(__file__)
 toolname = os.path.basename(__file__).split(".")[0]
diff --git a/bin/bitbake-server b/bin/bitbake-server
index 01f83d982f0c..1428f72a7e57 100755
--- a/bin/bitbake-server
+++ b/bin/bitbake-server
@@ -9,7 +9,6 @@ import os
 import sys
 import warnings
 warnings.simplefilter("default")
-warnings.filterwarnings("ignore", category=DeprecationWarning, message=".*use.of.fork.*may.lead.to.deadlocks.in.the.child.*")
 import logging
 sys.path.insert(0, os.path.join(os.path.dirname(os.path.dirname(sys.argv[0])), 'lib'))
 
diff --git a/bin/bitbake-worker b/bin/bitbake-worker
index d2b146a6a92f..d522ca54b7f8 100755
--- a/bin/bitbake-worker
+++ b/bin/bitbake-worker
@@ -9,7 +9,6 @@ import os
 import sys
 import warnings
 warnings.simplefilter("default")
-warnings.filterwarnings("ignore", category=DeprecationWarning, message=".*use.of.fork.*may.lead.to.deadlocks.in.the.child.*")
 sys.path.insert(0, os.path.join(os.path.dirname(os.path.dirname(sys.argv[0])), 'lib'))
 from bb import fetch2
 import logging
diff --git a/lib/bb/daemonize.py b/lib/bb/daemonize.py
index 76894044363e..70d9b8ee0e70 100644
--- a/lib/bb/daemonize.py
+++ b/lib/bb/daemonize.py
@@ -15,9 +15,12 @@ import os
 import sys
 import io
 import traceback
+import warnings
 
 import bb
 
+warnings.filterwarnings("ignore", category=DeprecationWarning, message=".*use.of.fork.*may.lead.to.deadlocks.in.the.child.*")
+
 def createDaemon(function, logfile):
     """
     Detach a process from the controlling terminal and run it in the

---
base-commit: 921e4ce1e030e4c8c3ecd5d6ffc7343df473d13c
change-id: 20260205-mathieu-fork-warning-filter-9b867e1c6acb

Best regards,
-- 
Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>

Re: [bitbake-devel] [PATCH] bin: Hide os.fork() deprecation warning at module level

[Richard Purdie]

On Thu, 2026-02-05 at 15:13 +0100, Mathieu Dubois-Briand via lists.openembedded.org wrote:
> Add the message filtering directly in the python module where the error
> happens, so we do not need to repeat the filter in all consumers. This
> will also make sure the filter is applied in any user of createDaemon().
> 
> Fixes [YOCTO #16080]
> 
> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
> Suggested-by: Chen Qi <Qi.Chen@windriver.com>
> ---
>  bin/bitbake         | 1 -
>  bin/bitbake-layers  | 1 -
>  bin/bitbake-server  | 1 -
>  bin/bitbake-worker  | 1 -

Nearly! :)

You need to leave bitbake-worker alone as it has a different use of
os.fork().

Cheers,

Richard

Re: [bitbake-devel] [PATCH] bin: Hide os.fork() deprecation warning at module level

[Mathieu Dubois-Briand]

On Thu Feb 5, 2026 at 4:29 PM CET, Richard Purdie wrote:
> On Thu, 2026-02-05 at 15:13 +0100, Mathieu Dubois-Briand via lists.openembedded.org wrote:
>> Add the message filtering directly in the python module where the error
>> happens, so we do not need to repeat the filter in all consumers. This
>> will also make sure the filter is applied in any user of createDaemon().
>> 
>> Fixes [YOCTO #16080]
>> 
>> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
>> Suggested-by: Chen Qi <Qi.Chen@windriver.com>
>> ---
>>  bin/bitbake         | 1 -
>>  bin/bitbake-layers  | 1 -
>>  bin/bitbake-server  | 1 -
>>  bin/bitbake-worker  | 1 -
>
> Nearly! :)
>
> You need to leave bitbake-worker alone as it has a different use of
> os.fork().
>

Right! I missed that point, sending a v2.

Thanks,
Mathieu


-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com