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1 | <html> | ||
2 | <head> | ||
3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
4 | <title>2.8.5.1. Source Fetching</title> | ||
5 | <link rel="stylesheet" type="text/css" href="../book.css"> | ||
6 | <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> | ||
7 | <link rel="home" href="index.html" title="Getting Started With Yocto Project"> | ||
8 | <link rel="up" href="bitbake-dev-environment.html" title="2.8.5. BitBake"> | ||
9 | <link rel="prev" href="bitbake-dev-environment.html" title="2.8.5. BitBake"> | ||
10 | <link rel="next" href="patching-dev-environment.html" title="2.8.5.2. Patching"> | ||
11 | </head> | ||
12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="2.8.5.1. Source Fetching"> | ||
13 | <div class="titlepage"><div><div><h4 class="title"> | ||
14 | <a name="source-fetching-dev-environment"></a>2.8.5.1. Source Fetching</h4></div></div></div> | ||
15 | <p> | ||
16 | The first stages of building a recipe are to fetch and unpack | ||
17 | the source code: | ||
18 | </p> | ||
19 | <table border="0" summary="manufactured viewport for HTML img" cellspacing="0" cellpadding="0" width="585"><tr style="height: 450px"><td align="center"><img src="figures/source-fetching.png" align="middle" width="585"></td></tr></table> | ||
20 | <p> | ||
21 | </p> | ||
22 | <p> | ||
23 | The | ||
24 | <a class="link" href="../ref-manual/ref-tasks-fetch.html" target="_self"><code class="filename">do_fetch</code></a> | ||
25 | and | ||
26 | <a class="link" href="../ref-manual/ref-tasks-unpack.html" target="_self"><code class="filename">do_unpack</code></a> | ||
27 | tasks fetch the source files and unpack them into the work | ||
28 | directory. | ||
29 | </p> | ||
30 | <div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"> | ||
31 | <h3 class="title">Note</h3> | ||
32 | For every local file (e.g. <code class="filename">file://</code>) | ||
33 | that is part of a recipe's | ||
34 | <a class="link" href="../ref-manual/var-SRC_URI.html" target="_self"><code class="filename">SRC_URI</code></a> | ||
35 | statement, the OpenEmbedded build system takes a checksum | ||
36 | of the file for the recipe and inserts the checksum into | ||
37 | the signature for the <code class="filename">do_fetch</code>. | ||
38 | If any local file has been modified, the | ||
39 | <code class="filename">do_fetch</code> task and all tasks that | ||
40 | depend on it are re-executed. | ||
41 | </div> | ||
42 | <p> | ||
43 | By default, everything is accomplished in the | ||
44 | <a class="link" href="../ref-manual/build-directory.html" target="_self">Build Directory</a>, | ||
45 | which has a defined structure. | ||
46 | For additional general information on the Build Directory, | ||
47 | see the | ||
48 | "<a class="link" href="../ref-manual/structure-core-build.html" target="_self"><code class="filename">build/</code></a>" | ||
49 | section in the Yocto Project Reference Manual. | ||
50 | </p> | ||
51 | <p> | ||
52 | Unpacked source files are pointed to by the | ||
53 | <a class="link" href="../ref-manual/var-S.html" target="_self"><code class="filename">S</code></a> | ||
54 | variable. | ||
55 | Each recipe has an area in the Build Directory where the | ||
56 | unpacked source code resides. | ||
57 | The name of that directory for any given recipe is defined from | ||
58 | several different variables. | ||
59 | You can see the variables that define these directories | ||
60 | by looking at the figure: | ||
61 | </p> | ||
62 | <div class="itemizedlist"><ul class="itemizedlist" type="disc"> | ||
63 | <li class="listitem"><p><a class="link" href="../ref-manual/var-TMPDIR.html" target="_self"><code class="filename">TMPDIR</code></a> - | ||
64 | The base directory where the OpenEmbedded build system | ||
65 | performs all its work during the build. | ||
66 | </p></li> | ||
67 | <li class="listitem"><p><a class="link" href="../ref-manual/var-PACKAGE_ARCH.html" target="_self"><code class="filename">PACKAGE_ARCH</code></a> - | ||
68 | The architecture of the built package or packages. | ||
69 | </p></li> | ||
70 | <li class="listitem"><p><a class="link" href="../ref-manual/var-TARGET_OS.html" target="_self"><code class="filename">TARGET_OS</code></a> - | ||
71 | The operating system of the target device. | ||
72 | </p></li> | ||
73 | <li class="listitem"><p><a class="link" href="../ref-manual/var-PN.html" target="_self"><code class="filename">PN</code></a> - | ||
74 | The name of the built package. | ||
75 | </p></li> | ||
76 | <li class="listitem"><p><a class="link" href="../ref-manual/var-PV.html" target="_self"><code class="filename">PV</code></a> - | ||
77 | The version of the recipe used to build the package. | ||
78 | </p></li> | ||
79 | <li class="listitem"><p><a class="link" href="../ref-manual/var-PR.html" target="_self"><code class="filename">PR</code></a> - | ||
80 | The revision of the recipe used to build the package. | ||
81 | </p></li> | ||
82 | <li class="listitem"><p><a class="link" href="../ref-manual/var-WORKDIR.html" target="_self"><code class="filename">WORKDIR</code></a> - | ||
83 | The location within <code class="filename">TMPDIR</code> where | ||
84 | a specific package is built. | ||
85 | </p></li> | ||
86 | <li class="listitem"><p><a class="link" href="../ref-manual/var-S.html" target="_self"><code class="filename">S</code></a> - | ||
87 | Contains the unpacked source files for a given recipe. | ||
88 | </p></li> | ||
89 | </ul></div> | ||
90 | <p> | ||
91 | </p> | ||
92 | </div></body> | ||
93 | </html> | ||