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Diffstat (limited to 'documentation/ref-manual/technical-details.xml')
| -rw-r--r-- | documentation/ref-manual/technical-details.xml | 59 |
1 files changed, 9 insertions, 50 deletions
diff --git a/documentation/ref-manual/technical-details.xml b/documentation/ref-manual/technical-details.xml index 5ef764c8e0..6bad547e50 100644 --- a/documentation/ref-manual/technical-details.xml +++ b/documentation/ref-manual/technical-details.xml @@ -901,56 +901,15 @@ <title>Debugging</title> <para> - When things go wrong, debugging needs to be straightforward. - Because of this, the Yocto Project includes strong debugging - tools: - <itemizedlist> - <listitem><para>Whenever a shared state package is written - out into the - <link linkend='var-SSTATE_DIR'><filename>SSTATE_DIR</filename></link>, - a corresponding <filename>.siginfo</filename> file is - also written. - This file contains a pickled Python database of all - the Metadata that went into creating the hash for a - given shared state package. - Whenever a stamp is written into the stamp directory - <link linkend='var-STAMP'><filename>STAMP</filename></link>, - a corresponding <filename>.sigdata</filename> file - is created that contains the same hash data that - represented the executed task. - </para></listitem> - <listitem><para>You can use BitBake to dump out the - signature construction information without executing - tasks by using either of the following BitBake - command-line options: - <literallayout class='monospaced'> - ‐‐dump-signatures=<replaceable>SIGNATURE_HANDLER</replaceable> - -S <replaceable>SIGNATURE_HANDLER</replaceable> - </literallayout> - <note> - Two common values for - <replaceable>SIGNATURE_HANDLER</replaceable> are - "none" and "printdiff" to only dump the signature - or to compare the dumped signature with the - cached one, respectively. - </note> - Using BitBake with either of these options causes - BitBake to dump out <filename>.sigdata</filename> files - in the stamp directory for every task it would have - executed instead of building the specified target - package. - </para></listitem> - <listitem><para>There is a - <filename>bitbake-diffsigs</filename> command that - can process <filename>.sigdata</filename> and - <filename>.siginfo</filename> files. - If you specify one of these files, BitBake dumps out - the dependency information in the file. - If you specify two files, BitBake compares the two - files and dumps out the differences between the two. - This more easily helps answer the question of "What - changed between X and Y?"</para></listitem> - </itemizedlist> + Seeing what metadata went into creating the input signature + of a shared state (sstate) task can be a useful debugging aid. + This information is available in signature information + (<filename>siginfo</filename>) files in + <link linkend='var-SSTATE_DIR'><filename>SSTATE_DIR</filename></link>. + For information on how to view and interpret information in + <filename>siginfo</filename> files, see the + "<link linkend='usingpoky-viewing-task-variable-dependencies'>Viewing Task Variable Dependencies</link>" + section. </para> </section> |