recipe style guide: add recommendation for patches without signature

>From discussion [0], the presence of git version signature at the end of
patches has been questionned. To avoid a bit more noise, the setting git
format.signature is added to the documentation and its use is
recommended.

[0]: https://lists.openembedded.org/g/openembedded-core/topic/106323318#msg199967

(From yocto-docs rev: 7da39b91a0f20cb7215d51e00c098f3dc13180fd)

Signed-off-by: Alexandre Truong <alexandre.truong@smile.fr>
Reviewed-by: Yoann Congal <yoann.congal@smile.fr>
Reviewed-by: Michael Opdenacker <michael@opdenacker.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/documentation/contributor-guide/recipe-style-guide.rst b/documentation/contributor-guide/recipe-style-guide.rst
index 08d8fb4259..142c02db1f 100644
--- a/documentation/contributor-guide/recipe-style-guide.rst
+++ b/documentation/contributor-guide/recipe-style-guide.rst
@@ -409,3 +409,15 @@ This should be the header of patch that fixes :cve:`2015-8370` in GRUB2::
    Upstream-Status: Backport [http://git.savannah.gnu.org/cgit/grub.git/commit/?id=451d80e52d851432e109771bb8febafca7a5f1f2]
    CVE: CVE-2015-8370
    Signed-off-by: Joe Developer <joe.developer@example.com>
+
+Patch format
+============
+
+By default, patches created with ``git format-patch`` have a `Git` version signature at the end.
+To avoid having a `Git` signature at the end of generated or updated patches,
+you can use `Git` configuration settings::
+
+   git config --global format.signature ""
+
+.. note::
+   Patches generated or updated by ``devtool`` are created with no signature.