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1 | <html> | ||
2 | <head> | ||
3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
4 | <title>3.2.4.2. Invalidating Shared State</title> | ||
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12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="3.2.4.2. Invalidating Shared State"> | ||
13 | <div class="titlepage"><div><div><h4 class="title"> | ||
14 | <a name="invalidating-shared-state"></a>3.2.4.2. Invalidating Shared State</h4></div></div></div> | ||
15 | <p> | ||
16 | The shared state code uses checksums and shared state | ||
17 | cache to avoid unnecessarily rebuilding tasks. | ||
18 | As with all schemes, this one has some drawbacks. | ||
19 | It is possible that you could make implicit changes that are not factored | ||
20 | into the checksum calculation, but do affect a task's output. | ||
21 | A good example is perhaps when a tool changes its output. | ||
22 | Let's say that the output of <code class="filename">rpmdeps</code> needed to change. | ||
23 | The result of the change should be that all the "package", "package_write_rpm", | ||
24 | and "package_deploy-rpm" shared state cache items would become invalid. | ||
25 | But, because this is a change that is external to the code and therefore implicit, | ||
26 | the associated shared state cache items do not become invalidated. | ||
27 | In this case, the build process would use the cached items rather than running the | ||
28 | task again. | ||
29 | Obviously, these types of implicit changes can cause problems. | ||
30 | </p> | ||
31 | <p> | ||
32 | To avoid these problems during the build, you need to understand the effects of any | ||
33 | change you make. | ||
34 | Note that any changes you make directly to a function automatically are factored into | ||
35 | the checksum calculation and thus, will invalidate the associated area of sstate cache. | ||
36 | You need to be aware of any implicit changes that are not obvious changes to the | ||
37 | code and could affect the output of a given task. | ||
38 | Once you are aware of such a change, you can take steps to invalidate the cache | ||
39 | and force the task to run. | ||
40 | The step to take is as simple as changing a function's comments in the source code. | ||
41 | For example, to invalidate package shared state files, change the comment statements | ||
42 | of <code class="filename">do_package</code> or the comments of one of the functions it calls. | ||
43 | The change is purely cosmetic, but it causes the checksum to be recalculated and | ||
44 | forces the task to be run again. | ||
45 | </p> | ||
46 | <div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"> | ||
47 | <h3 class="title">Note</h3> | ||
48 | For an example of a commit that makes a cosmetic change to invalidate | ||
49 | a shared state, see this | ||
50 | <a class="ulink" href="http://git.yoctoproject.org/cgit.cgi/poky/commit/meta/classes/package.bbclass?id=737f8bbb4f27b4837047cb9b4fbfe01dfde36d54" target="_self">commit</a>. | ||
51 | </div> | ||
52 | </div></body> | ||
53 | </html> | ||