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bitbake: user-manual-execution.xml: Updated "Checksum (Signatures) section. 

Fixes [YOCTO #5357]

Added a paragraph at the end of this section to address the fact
that the user can now debug Bitbake's processing of signatures.
This introduces the -S bitbake option and the fact that the
user can provide a couple parameters with it: "none" and
"printdiff".

(Bitbake rev: 4093fa6c96eebe0bbafb93dc27d8a978cca436c4)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2014-03-27 15:35:43 +00:00 committed by Richard Purdie
parent e7277a53ed
commit 34f4a9d8b7
1 changed files with 24 additions and 0 deletions
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bitbake/doc/user-manual/user-manual-execution.xml
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@ -750,6 +750,30 @@
</itemizedlist>
</para>
<para>
It is worth noting that BitBake's "-S" option lets you
debug Bitbake's processing of signatures.
The options passed to -S allow different debugging modes
to be used, either using BitBake's own debug functions
or possibly those defined in the metadata/signature handler
itself.
The simplest parameter to pass is "none", which causes a
set of signature information to be written out into
<filename>STAMP_DIR</filename>
corresponding to the targets specified.
The other currently available parameter is "printdiff",
which causes BitBake to try to establish the closest
signature match it can (e.g. in the sstate cache) and then
run <filename>bitbake-diffsigs</filename> over the matches
to determine the stamps and delta where these two
stamp trees diverge.
<note>
It is likely that future versions of BitBake with
provide other signature handlers triggered through
additional "-S" paramters.
</note>
</para>
<para>
You can find more information on checksum metadata in the
"<link linkend='task-checksums-and-setscene'>Task Checksums and Setscene</link>"