\input{configpres}

\title{ELBE example}
\maketitle

\subsection{What will be done?}

\begin{frame}
\frametitle{Goal}
\begin{itemize}
\item generate an ELBE buildenv
\item generate a software component and manage it with debian tools
\item build own software component inside the ELBE buildenv
\item include own application in target RFS
\item define a stripped target RFS
\item setup a local debian mirror
\end{itemize}
\end{frame}

\subsection{generate a buildenv}

\lstset{language=xml}
\begin{frame}[fragile]
\frametitle{minimal XML file}
\begin{lstlisting}
<ns0:RootFileSystem
 xmlns:ns0="https://www.linutronix.de/projects/Elbe"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 created="2009-05-20T08:50:56" revision="6"
 xsi:schemaLocation="https://www.linutronix.de/projects/Elbe dbsfed.xsd">
  <project>
    <name>mini xml</name>
    <version>1</version>
    <description>
      optimal to use as buildenv
    </description>
    <buildtype>armel</buildtype>
    <mirror>
      <primary_host>ftp.debian.org</primary_host>
      <primary_path>/debian</primary_path>
      <primary_proto>http</primary_proto>
      <url-list>
        <url>
          <binary>http://debian.linutronix.de/elbe wheezy main</binary>
        </url>
      </url-list>
    </mirror>
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{minimal XML file}
\begin{lstlisting}
    <suite>wheezy</suite>
    <buildimage>
      <kinitrd>elbe-bootstrap</kinitrd>
      <pkg-list>
        <pkg>build-essential</pkg>
        <pkg>debhelper</pkg>
        <pkg>devscripts</pkg>
        <pkg>autotools-dev</pkg>
        <pkg>automake</pkg>
      </pkg-list>
    </buildimage>
  </project>
  <target>
    <hostname>mini</hostname>
    <domain>linutronix</domain>
    <passwd>foo</passwd>
    <finetuning>
    </finetuning>
    <pkg-list>
      <pkg>bash</pkg>
    </pkg-list>
  </target>
</ns0:RootFileSystem>
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{create and build mini.xml}
\begin{lstlisting}
$ elbe create --directory=./buildenv mini.xml
$ cd buildenv
$ make
\end{lstlisting}
\end{frame}

\subsection{build an own application}

\begin{frame}[fragile]
\frametitle{myapp.c}
\begin{lstlisting}
$ mkdir myapp
$ cd myapp
$ $EDITOR myapp.c
\end{lstlisting}
\begin{lstlisting}
#include <stdio.h>
#include <time.h>

int main (int argc, char **argv)
{
    while (1) {
        printf ("Hello ELBE\n");
        sleep (1);
    }

    return 0;
}
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{use autotools}
\begin{lstlisting}
$ $EDITOR Makefile.am
\end{lstlisting}
\begin{lstlisting}
bin_PROGRAMS = myapp
myapp_SOURCES = myapp.c
\end{lstlisting}
\begin{lstlisting}
$ autoscan
$ mv configure.scan configure.ac
$ rm autoscan.log
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle {use autotools}
\begin{lstlisting}
$ $EDITOR configure.ac
\end{lstlisting}
\begin{lstlisting}
#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.69])
AC_INIT([myapp], [1.0], [manut@linutronix.de])
AM_INIT_AUTOMAKE([-Wall -Werror])
AC_CONFIG_SRCDIR([myapp.c])
AC_CONFIG_HEADERS([config.h])

# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_CONFIG_FILES([Makefile])

AC_OUTPUT
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{use autotools}
\begin{lstlisting}
$ touch NEWS README AUTHORS ChangeLog
$ $EDITOR autogen.sh
\end{lstlisting}
\begin{lstlisting}
#!/bin/bash
automake --add-missing
autoreconf -sif
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{use autotools}
\begin{lstlisting}
$ chmod +x autogen.sh
$ ls -lh
insgesamt 12K
-rw-r--r-- 1 local local   0 Jan  7 09:45 AUTHORS
-rwxr-xr-x 1 local local  28 Jan  7 09:24 autogen.sh
-rw-r--r-- 1 local local   0 Jan  7 09:45 ChangeLog
-rw-r--r-- 1 local local 496 Jan  7 09:20 configure.ac
-rw-r--r-- 1 local local  35 Jan  7 09:35 Makefile.am
-rw-r--r-- 1 local local 143 Jan  7 09:18 myapp.c
-rw-r--r-- 1 local local   0 Jan  7 09:45 NEWS
-rw-r--r-- 1 local local   0 Jan  7 09:45 README
# these files may be added to your vcs
$ ./autogen.sh
$ ./configure
$ make
$ ./myapp
Hello ELBE
Hello ELBE
Hello ELBE
^C
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{debianize myapp}
\begin{lstlisting}
$ dh_make -n -p myapp_1.0 -e manut@linutronix.de
$ cd debian
$ rm *.ex *.EX docs README* copyright
$ $EDITOR changelog
\end{lstlisting}
\begin{lstlisting}
myapp (1.0) stable; urgency=low

  * Initial Release.

 -- Manuel Traut <manut@linutronix.de>  Tue, 07 Jan 2014 10:20:20 +0100
\end{lstlisting}
\begin{lstlisting}
$ ls -lh
insgesamt 16K
-rw-r--r-- 1 local local 122 Jan  7 10:20 changelog
-rw-r--r-- 1 local local   2 Jan  7 10:20 compat
-rw-r--r-- 1 local local 517 Jan  7 10:20 control
-rwxr-xr-x 1 local local 135 Jan  7 10:20 rules
drwxr-xr-x 2 local local  19 Jan  7 10:20 source
# these files may be added to your vcs
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{debianize myapp}
\begin{lstlisting}
$ cd ..
$ $EDITOR Makefile.am
\end{lstlisting}
\begin{lstlisting}
bin_PROGRAMS = myapp
myapp_SOURCES = myapp.c

EXTRA_DIST = debian/changelog debian/compat debian/control debian/rules \
  debian/source/format
\end{lstlisting}
\begin{lstlisting}
$ dpkg-buildpackage
$ ls ..
myapp                     myapp_1.0_i386.deb
myapp_1.0.dsc             myapp_1.0.tar.gz
myapp_1.0_i386.changes
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{host myapp in a debian repository}
\begin{lstlisting}
$ cd ..
$ mkdir -p myrepo/conf
$ cd myrepo
$ $EDITOR conf/distributions
\end{lstlisting}
\begin{lstlisting}
Origin: myrepo
Label: myrepo
Suite: stable
Codename: wheezy
Update: - myremoterepo
Version:
Architectures: i386 amd64 source
Components: main
Description: my debian packages
\end{lstlisting}
\begin{lstlisting}
$ $EDITOR conf/updates
\end{lstlisting}
\begin{lstlisting}
Name: myremoterepo
Method: http://localhost/myrepo
Components: main
Architectures: i386 amd64 armel source
VerifyRelease: blindtrust
IgnoreRelease: yes
\end{lstlisting}
\end{frame}


\begin{frame}[fragile]
\frametitle{host myapp in a debian repository}
\begin{lstlisting}
$ reprepro include wheezy ../myapp_1.0_i386.changes
$ sudo mkdir /var/www/
$ sudo rsync -av --exclude=db --exclude=conf * /var/www/myrepo/
\end{lstlisting}
\end{frame}


\begin{frame}[fragile]
\frametitle{build debian package inside the buildenv}
\begin{lstlisting}
$ cd ../buildenv
$ make run-con
\end{lstlisting}
login into buildenv and configure apt to use myrepo
\begin{lstlisting}
$ echo 'deb-src http://10.0.2.2/myrepo wheezy main' >> /etc/apt/sources.list
$ apt-get update
\end{lstlisting}
retrive myapp source package and build armel binary package
\begin{lstlisting}
$ apt-get source myapp
$ cd myapp-1.0
$ ./autogen.sh
$ dpkg-buildpackage -b
\end{lstlisting}
copy the package to the host PC and install it into the buildenv
\begin{lstlisting}
$ scp ../myapp*.changes ../myapp*.deb 10.0.2.2:/tmp
$ dpkg -i ../myapp*.deb
$ myapp
\end{lstlisting}
\end{frame}


\begin{frame}[fragile]
\frametitle{add myapp armel package to the repo}
\begin{lstlisting}
$ cd ../myrepo
$ reprepro include wheezy /tmp/myapp_1.0_armel.changes
$ sudo rsync -av --exclude=db --exclude=conf * /var/www/myrepo/
\end{lstlisting}
\end{frame}


\subsection{include app in target RFS}

\begin{frame}[fragile]
\frametitle{add repo including myapp}
\begin{lstlisting}
$ cd ..
$ $EDIT mini.xml
\end{lstlisting}
\begin{lstlisting}
...
    <mirror>
      <primary_host>ftp.debian.org</primary_host>
      <primary_path>/debian</primary_path>
      <primary_proto>http</primary_proto>
      <url-list>
        <url>
          <binary>http://debian.linutronix.de/elbe wheezy main</binary>
        </url>
        <url>
          <binary>http://LOCALMACHINE/myrepo wheezy main</binary>
          <source>http://LOCALMACHINE/myrepo wheezy main</source>
        </url>
      </url-list>
    </mirror>
    <noauth/>
...
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{add myapp}
\begin{lstlisting}
...
  <target>
    <hostname>mini</hostname>
    <domain>linutronix</domain>
    <passwd>foo</passwd>
    <finetuning>
      <rm>var/cache/apt/archives/*.deb</rm>
    </finetuning>
    <pkg-list>
      <pkg>bash</pkg>
      <pkg>myapp</pkg>
    </pkg-list>
  </target>
</ns0:RootFileSystem>
\end{lstlisting}
\end{frame}

\subsection{define a striped target RFS}
\begin{frame}[fragile]
\frametitle{define sdcard image}
\begin{lstlisting}
...
  <target>
    <hostname>mini</hostname>
    <domain>linutronix</domain>
    <passwd>foo</passwd>
    <console>ttyAMA0,115200</console>
    <package>
      <tar>
        <name>rootfs.tar.gz</name>
      </tar>
    </package>
    <images>
      <msdoshd>
        <name>my.img</name>
        <size>64MiB</size>
        <partition>
          <size>remain</size>
          <label>rfs</label>
        </partition>
      </msdoshd>
    </images>
...
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{create fstab and set elbe mode}
\begin{lstlisting}
...
    </images>
    <fstab>
      <bylabel>
        <label>rfs</label>
        <mountpoint>/</mountpoint>
        <fs>
          <type>ext2</type>
          <tune2fs>-i 0</tune2fs>
        </fs>
      </bylabel>
    </fstab>
    <diet />
    <norecommend />
    <finetuning>
...
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{build and extract target as nfsroot}
\begin{lstlisting}
$ elbe create mini.xml --directory=./target
$ cd target
$ make
\end{lstlisting}
hint: it is possible to generate a html page from the elbe-report.txt:
\begin{lstlisting}
$ asciidoc elbe-report.txt
\end{lstlisting}
host the nfs root filesystem
\begin{lstlisting}
$ sudo mkdir -p /nfs/elbe-armel
$ sudo tar xzf rootfs.tar.gz -C /nfs/elbe-armel
$ su -c 'echo "/nfs *(rw,sync,no_subtree_check,insecure) >> /etc/exports"'
$ sudo /etc/init.d/nfs-kernel-server restart
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{build current kernel for qemu armel boot}
\begin{lstlisting}
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux
$ cd linux
$ mkdir ../linux-qemu-arm
$ ARCH=arm CROSS_COMPILE=arm-none-eabi- make O=../linux-qemu-arm versatile_defconfig
$ # enable Kernel Features / Use the ARM EABI to compile the kernel
$ #                  Allow old ABI binaries to run with this kernel
$ #        Networking support / Networking options / TCP/IP networking /
$ #           IP: kernel level autoconfiguration / IP: DHCP Support
$ ARCH=arm CROSS_COMPILE=arm-none-eabi- make O=../linux-qemu-arm menuconfig
$ ARCH=arm CROSS_COMPILE=arm-none-eabi- make O=../linux-qemu-arm -j5 
$ cd ..
\end{lstlisting}
\end{frame}


\begin{frame}[fragile]
\frametitle{boot nfsroot with qemu}
\begin{lstlisting}
qemu-system-arm -M versatilepb -no-reboot \
  -m 256 -usb \
  -kernel linux-qemu-arm/arch/arm/boot/zImage \
  -append 'root=/dev/nfs nfsroot=10.0.2.2:/nfs/elbe-armel ip=dhcp init=/usr/bin/myapp'
\end{lstlisting}
\end{frame}

\begin{frame}[fragile]
\frametitle{strip the nfsroot}
\begin{lstlisting}
$ sudo rm -rf /nfs/elbe-armel/etc
$ sudo rm -rf /nfs/elbe-armel/sbin
$ sudo rm -rf /nfs/elbe-armel/var
$ sudo rm -rf /nfs/elbe-armel/usr/share
$ sudo rm -rf /nfs/elbe-armel/usr/lib
$ sudo rm -rf /nfs/elbe-armel/usr/sbin
$ sudo cp /nfs/elbe-armel/usr/bin/myapp .
$ sudo rm -rf /nfs/elbe-armel/usr/bin/*
$ sudo mv myapp /nfs/elbe-armel/usr/bin/
$ sudo cp -a /nfs/elbe-armel/lib/arm-linux-gnueabi/ld-* .
$ sudo cp -a /nfs/elbe-armel/lib/arm-linux-gnueabi/libc-2.13.so .
$ sudo cp -a /nfs/elbe-armel/lib/arm-linux-gnueabi/libc.so.6 .
$ sudo rm /nfs/elbe-armel/lib/arm-linux-gnueabi/*
$ sudo mv libc-2.13.so /nfs/elbe-armel/lib/arm-linux-gnueabi/
$ sudo mv libc.so.6 /nfs/elbe-armel/lib/arm-linux-gnueabi/
$ sudo mv ld-* /nfs/elbe-armel/lib/arm-linux-gnueabi/
\end{lstlisting}
\end{frame}


\begin{frame}[fragile]
\frametitle{update the ELBE XML file}
\begin{lstlisting}
$ sudo mkdir /nfs/elbe-armel-orig
$ sudo tar xzf rootfs.tar.gz -C /nfs/elbe-armel-orig/
$ elbe pkgdiff
$ sudo elbe diff /nfs/elbe-armel-orig /nfs/elbe-armel > diff.txt
$ cd ..
\end{lstlisting}
\begin{lstlisting}
$ vim mini.xml
$ # place cursor in finetuning section
$ <ESC>:read target/diff.txt<RETURN>
$ # remove everything until 'suggesting:'
$ <ESC>:x<RETURN>
\end{lstlisting}
\begin{lstlisting}
$ elbe create --directory=target-stripped mini.xml
$ cd target-stripped
$ make
$ # get debian kernel and initrd from the buildenv:
$ make .elbe-vm/vmkernel .elbe-vm/vminitrd
$ # boot the image
$ qemu-system-arm -M versatilepb \
-kernel .elbe-vm/vmkernel -initrd .elbe-vm/vminitrd \
-append 'root=/dev/sda1 init=/usr/bin/myapp' my.img
\end{lstlisting}
\end{frame}

\subsection{setup own debian mirror}

\begin{frame}[fragile]
\frametitle{partial clone a remote debian mirror}
\begin{lstlisting}
$ mkdir -p /mirrors/debian
$ cd debian
$ debmirror -p -d wheezy, -a i386,amd64,armel,armhf --di-dist=wheezy \
--method=http --no-check-gpg -h ftp.de.debian.org .
$ cd /var/www/html
$ ln -s  /mirrors/debian
\end{lstlisting}
\end{frame}

\subsection{Conclusion}
\begin{frame}
\begin{itemize}
\item generate an ELBE buildenv with a minimal XML file
\item manage software components with autotools, dpkg and reprepro
\item build own software component inside the ELBE buildenv
\item include own debian packages in the target RFS
\item edit a running rootfs and make it reproducable
\item setup a partial, local debian mirror
\end{itemize}
\end{frame}

\input{tailpres}
