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\begin{frame}[fragile]
\frametitle{start the image}
\begin{verbatim}
% runqemu qemux86 core-image-minimal
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/
├── buildstats
├── cache
├── deploy
├── log
├── sstate-control
├── stamps
├── sysroots
├── work
└── work-shared
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/buildstats/core-image-minimal-qemux86/201408271416/
├── acl-2.2.52-r0
├── acl-native-2.2.52-r0
├── alsa-lib-native-1.0.27.2-r0
├── attr-2.4.47-r0
├── attr-native-2.4.47-r0
├── autoconf-native-2.69-r11
...
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/buildstats/core-image-minimal-qemux86/201408271416/acl-2.2.52-r0/
├── do_compile
├── do_compile_ptest_base
├── do_configure
├── do_configure_ptest_base
├── do_fetch
├── do_install
├── do_install_ptest_base
├── do_package
├── do_packagedata
├── do_package_write_rpm
├── do_patch
├── do_populate_lic
├── do_populate_sysroot
└── do_unpack
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
408271416/acl-2.2.52-r0/do_unpack
Event: TaskStarted
Started: 1409143746.65
acl-2.2.52-r0: do_unpack: Elapsed time: 0.22 seconds
CPU usage: 7.1%
EndIOinProgress: 0
EndReadsComp: 973062
EndReadsMerged: 543875573
EndSectRead: 36860156
EndSectWrite: 1158945211
EndTimeIO: 30104972
EndTimeReads: 5545878
EndTimeWrite: 1455538600
...
StartWritesComp: 12202741
Status: PASSED
Ended: 1409143746.87
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/
├── buildstats
├── cache
├── deploy
├── log
├── sstate-control
├── stamps
├── sysroots
├── work
└── work-shared
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/deploy/
├── images
│ └── qemux86
│ ├── bzImage -> bzImage--3.14+git0+09424...
│ ├── core-image-minimal-qemux86-20140827121546.rootfs.ext3
│ ├── core-image-minimal-qemux86-20140827121546.rootfs.manifest
│ ├── core-image-minimal-qemux86-20140827121546.rootfs.tar.bz2
│ ├── core-image-minimal-qemux86.ext3 -> core-image...
│ ├── ...
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/deploy/
├── licenses
│ ├── acl
│ │ ├── COPYING
│ │ ├── COPYING.LGPL
│ │ ├── generic_GPLv2
│ │ └── generic_LGPLv2.1
│ ├── acl-native
│ ├── alsa-lib-native
│ ├── apr-native
│ ├── ..
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
tmp/deploy/
└── rpm
├── all
│ ├── packagegroup-core-standalone-sdk-target-1.0-r8.all.rpm
│ ├── packagegroup-core-standalone-sdk-target-dbg-1.0-r8.all.rpm
│ ├── packagegroup-core-standalone-sdk-target-dev-1.0-r8.all.rpm
│ ├── repodata
│ ├── run-postinsts-1.0-r9.all.rpm
│ ├── ...
├── i586
├── qemux86
└── x86_64_nativesdk
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{inspect the build}
\begin{verbatim}
├── % cat sstate-control/manifest-<pn>.<task>
| /home/devel/poky/build/tmp/sysroots/x86_64-linux/usr/include/zconf.h
| /home/devel/poky/build/tmp/sysroots/x86_64-linux/usr/include/zlib.h
| /home/devel/poky/build/tmp/sysroots/x86_64-linux/usr/lib/libz.so.1
\end{verbatim}
\pause
\begin{verbatim}
├── sysroots # for the differnet architectures
\end{verbatim}
\pause
\begin{verbatim}
├── work # work directories / where the sources are built
| % ls tmp/work/qemux86-poky-linux/linux-yocto/3.14+gitAUTOINC+0942...
| deploy-linux-yocto linux packages-split
| deploy-rpms linux-qemux86-standard-build pkgdata
| image linux-yocto.spec pseudo
| license-destdir package sysroot-destdir
| temp
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{execute a specific task}
\begin{verbatim}
bitbake <recipe> -c <task>
\end{verbatim}
use
\begin{verbatim}
bitbake <recipe> -c listtasks
\end{verbatim}
to get a list of all available tasks
\end{frame}
\begin{frame}[fragile]
\frametitle{build dependencies}
dependency graphs (sucks because they're really huge)
\begin{verbatim}
bitbake -g <target>
\end{verbatim}
\pause
it is better to use the dependency explorer
\begin{verbatim}
bitbake -g -u depexp <target>
\end{verbatim}
\end{frame}
\begin{frame}[fragile]
\frametitle{developer shell}
\begin{verbatim}
bitbake <recipe> -c devshell
\end{verbatim}
use ./configure and make to debug build issues
\end{frame}
\begin{frame}[fragile]
\frametitle{cleanup}
\begin{verbatim}
% bitbake -c clean core-image-minimal
\end{verbatim}
\pause
\begin{itemize}
\item doesn't cleanup dependencies
\item doesn't remove deployed files
\item triggers repackaging of all packages
\end{itemize}
\vspace{2em}
To start from scratch backup the conf directory
and remove everything from build. Otherwise
sstate-cache will be used.
\end{frame}
\begin{frame}[fragile]
\frametitle{cleanup}
\begin{verbatim}
% bitbake -c clean xserver-nodm-init
\end{verbatim}
\pause
\begin{itemize}
\item doesn't cleanup dependencies
\item removes deployed files
\item removes downloaded files
\item removes data from work and sysroot directory
\item doesn't remove data from sstate
\item triggers restoring files from sstate-cache
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{cleanup}
\begin{verbatim}
% bitbake -c cleanall xserver-nodm-init
\end{verbatim}
\pause
\begin{itemize}
\item doesn't cleanup dependencies
\item removes deployed files
\item removes downloaded files
\item removes data from work and sysroot directory
\item removes data from sstate-cache
\item triggers fetch, compilation and packaging of the component
\item BUT changes will not be in the image
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{force recompilation}
\begin{verbatim}
% bitbake -f -c compile xserver-nodm-init
\end{verbatim}
\begin{itemize}
\item changes are not in the image
\item and not in the package
\end{itemize}
\end{frame}
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