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bitbake: bitbake-user-manual: Updated "Task Checksums and Setscene" section

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Fixes [#YOCTO 12030]

Updated the "Task Checksums and Setscene" section to provide a bit
of user information around the bitbake-dumpsigs use that lets a
user examine signatures and inputs that determine if a do_compile
task is indeed supposed to be run.

Added more explanation of how a user can examine signatures used
to determine if a do_compile task is indeed supposed to be run.

(Bitbake rev: 103bbc6642261cd5da038ba2071621919ee01253)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2018-04-12 12:55:29 -07:00
committed by Richard Purdie
parent adde339596
commit 8dbf71b553
1 changed files with 47 additions and 29 deletions
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76
bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
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@@ -2651,53 +2651,71 @@
OpenEmbedded metadata-based example.
</para>
<!--
<para>
Bug 12030: This list is a place holder of content existed from previous work
on the manual.
Some or all of it probably needs integrated into the subsections
that make up this section.
For now, I have just provided a short glossary-like description
for each variable.
These checksums are stored in
<link linkend='var-STAMP'><filename>STAMP</filename></link>.
You can examine the checksums using the following BitBake command:
<literallayout class='monospaced'>
$ bitbake-dumpsigs
</literallayout>
This command returns the signature data in a readable format
that allows you to examine the inputs used when the
OpenEmbedded build system generates signatures.
For example, using <filename>bitbake-dumpsigs</filename>
allows you to examine the <filename>do_compile</filename>
task's “sigdata” for a C application (e.g.
<filename>bash</filename>).
Running the command also reveals that the “CC” variable is part of
the inputs that are hashed.
Any changes to this variable would invalidate the stamp and
cause the <filename>do_compile</filename> task to run.
</para>
-->
<para>
The following list describes related variables:
<itemizedlist>
<listitem><para><filename>STAMP</filename>:
The base path to create stamp files.</para></listitem>
<listitem><para><filename>STAMPCLEAN</filename>
Again, the base path to create stamp files but can use wildcards
for matching a range of files for clean operations.
</para></listitem>
<listitem><para><filename>BB_STAMP_WHITELIST</filename>
Lists stamp files that are looked at when the stamp policy
is "whitelist".
</para></listitem>
<listitem><para><filename>BB_STAMP_POLICY</filename>
Defines the mode for comparing timestamps of stamp files.
</para></listitem>
<listitem><para><filename>BB_HASHCHECK_FUNCTION</filename>
<listitem><para>
<link linkend='var-BB_HASHCHECK_FUNCTION'><filename>BB_HASHCHECK_FUNCTION</filename></link>:
Specifies the name of the function to call during
the "setscene" part of the task's execution in order
to validate the list of task hashes.
</para></listitem>
<listitem><para><filename>BB_SETSCENE_VERIFY_FUNCTION2</filename>
Specifies a function to call that verifies the list of
planned task execution before the main task execution
happens.
</para></listitem>
<listitem><para><filename>BB_SETSCENE_DEPVALID</filename>
<listitem><para>
<link linkend='var-BB_SETSCENE_DEPVALID'><filename>BB_SETSCENE_DEPVALID</filename></link>:
Specifies a function BitBake calls that determines
whether BitBake requires a setscene dependency to
be met.
</para></listitem>
<listitem><para><filename>BB_TASKHASH</filename>
<listitem><para>
<link linkend='var-BB_SETSCENE_VERIFY_FUNCTION2'><filename>BB_SETSCENE_VERIFY_FUNCTION2</filename></link>:
Specifies a function to call that verifies the list of
planned task execution before the main task execution
happens.
</para></listitem>
<listitem><para>
<link linkend='var-BB_STAMP_POLICY'><filename>BB_STAMP_POLICY</filename></link>:
Defines the mode for comparing timestamps of stamp files.
</para></listitem>
<listitem><para>
<link linkend='var-BB_STAMP_WHITELIST'><filename>BB_STAMP_WHITELIST</filename></link>:
Lists stamp files that are looked at when the stamp policy
is "whitelist".
</para></listitem>
<listitem><para>
<link linkend='var-BB_TASKHASH'><filename>BB_TASKHASH</filename></link>:
Within an executing task, this variable holds the hash
of the task as returned by the currently enabled
signature generator.
</para></listitem>
<listitem><para>
<link linkend='var-STAMP'><filename>STAMP</filename></link>:
The base path to create stamp files.
</para></listitem>
<listitem><para>
<link linkend='var-STAMPCLEAN'><filename>STAMPCLEAN</filename></link>:
Again, the base path to create stamp files but can use wildcards
for matching a range of files for clean operations.
</para></listitem>
</itemizedlist>
</para>
</section>