Styleguide: Difference between revisions

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= Naming Conventions =
This page has moved to the [https://docs.yoctoproject.org/dev/contributor-guide/recipe-style-guide.html Yocto Documentation Contributors Guide]
 
[[Versioning Policy|Use $packagename_$version.bb]]
 
= Format Guidelines =
 
* No spaces are allowed behind the line continuation symbol
* The correct spacing for a variable is FOO = "BAR".
* Use quotes on the right hand side of assignments: FOO = "BAR"
* Comments inside bb files are allowed using the '#' character at the beginning of a line.
* Use spaces for indentation as developers tends to use different amount of spaces per one tab.
* Indentation of multiline variables such as SRC_URI is desireable.
* Python functions should be four space indented, no tabs.
* Shell functions are usually tab character indented.
 
= Style Checking tools =
 
Please run ./contrib/oe-stylize.py on your recipes before submitting them.
 
= Style Guidelines =
 
* Put the ''inherit'' declaration after the initial variables are set up and before any custom ''do_'' routines. This is flexible as ordering is often important.
* If you define custom ''do_'' routines, keep them in the order of the tasks being executed, that is:
** do_fetch
** do_unpack
** do_patch
** do_configure
** do_compile
** do_install
** do_populate_sysroot
** do_package
 
* Don't use ''cp'' to put files into staging or destination directories, use ''install'' instead.
* Don't use ''mkdir'' to create destination directories, use ''install -d'' instead.
 
* There is a standard set of variables often found in a .bb file and the preferred order (to make the file easily readable to seasoned developers) is
** DESCRIPTION
** AUTHOR
** HOMEPAGE
** SECTION
** PRIORITY
** LICENSE
** DEPENDS
** RDEPENDS
** RRECOMMENDS
** RSUGGESTS
** PROVIDES
** RPROVIDES
** RCONFLICTS
** SRCDATE
** PV
** PR
** SRC_URI
** S
** inherit ...
** build class specific variables, i.e. EXTRA_QMAKEVARS_POST
** task overrides, i.e. do_configure
** PACKAGE_ARCH
** PACKAGES
** FILES
 
* Package related variables for a given package are often grouped together for clarity.
 
= Example Recipe =
 
<pre>
DESCRIPTION = "X11 Code Viewer"
AUTHOR = "John Bazz <john.bazz@example.org>"
HOMEPAGE = "http://www.example.org/xcv/"
SECTION = "x11/applications"
PRIORITY = "optional"
LICENSE = "GPLv2"
DEPENDS = "libsm libx11 libxext libxaw"
RDEPENDS = "shared-mime-info"
RRECOMMENDS = "ctags"
RCONFLICTS = "xcv2"
SRCDATE = "20060815"
PV = "0.0+cvs${SRCDATE}"
PR = "r5"
 
# upstream does not yet publish any release so we have to fetch last working version from CVS
SRC_URI = "cvs://anonymous@xcv.example.org/cvsroot/xcv;module=xcv \
          file://toolbar-resize-fix.patch;patch=1"
 
S = "${WORKDIR}/xcv/"
 
inherit autotools
 
do_configure_prepend() {
    rm ${S}/aclocal.m4
}
 
do_install() {
    install -d ${D}${bindir}
    install -d ${D}${mandir}/man1
 
    install -m 0755 xcv ${D}${bindir}/ 
    install -m 0644 xcv.1.gz ${D}${mandir}/man1/
}
</pre>
 
= PR variables with recipes that use INC files =
When recipe include files are used, the PR handling gets kind of messy.  Its a pain to have to audit the PR in all the dependent recipes when you change something in an INC file.  We usually use the following solution:
 
<pre>
recipe: PR = "${INC_PR}.1"
 
inc file: INC_PR = "r1"
</pre>
 
When converting existing recipes to use INC_PR, set the initial INC_PR to the maximum of the current PRs.
[[Category:Policy]]

Latest revision as of 16:54, 30 August 2023

This page has moved to the Yocto Documentation Contributors Guide

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