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ref-manual: Updated the do_fetch closer look for checksum behavior. 

Fixes [YOCTO #5521]

I created a brief note in the do_fetch subsection of the
"Taking a Closer Look" section to deal with how the build
system uses checksums during do_fetch to re-execute stuff
if a file:// listed in the SRC_URI has had its contents
modified.

(From yocto-docs rev: 7b857635f2663af7c1d5e8aa87239472a5b47919)

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 2014-06-02 17:22:00 +03:00 committed by Richard Purdie
parent a456afa06c
commit d57b5e5149
1 changed files with 13 additions and 2 deletions
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15
documentation/ref-manual/closer-look.xml
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@ -713,8 +713,19 @@
<link linkend='ref-tasks-fetch'><filename>do_fetch</filename></link>
and
<link linkend='ref-tasks-unpack'><filename>do_unpack</filename></link>
tasks fetch the source files
and unpack them into the work directory.
tasks fetch the source files and unpack them into the work
directory.
<note>
For every local file (e.g. <filename>file://</filename>)
that is part of a recipe's
<link linkend='var-SRC_URI'><filename>SRC_URI</filename></link>
statement, the OpenEmbedded build system takes a checksum
of the file for the recipe and inserts the checksum into
the signature for the <filename>do_fetch</filename>.
If any local file has been modified, the
<filename>do_fetch</filename> task and all tasks that
depend on it are re-executed.
</note>
By default, everything is accomplished in the
<ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>,
which has a defined structure.