Setting up the build environment 1.7

Quick note on how to set up a build environment.
NOTE: This document is obsolete since Alpine no longer is based on Gentoo. Please use the 1.9 build environment.
In this document the build environment will be created in /opt/alpine/1.7. You can ofcourse place it anywhere you have space.
You will need a few Gigabytes to have enough space for kernel cmpiling and storing all the binary packages and iso image.
If you already done this part and only want to 'update your build env.' then see bottom of this page.
== Requirements ==
You need a 2.6 kernel to use the chroot build environment.
* Note: Make sure your running kernel supports 16bit UIDs for backward compatibility. uCLibc needs them. Check it with:
 zcat /proc/config.gz | grep CONFIG_UID16
or if you dont have /proc/config.gz:
 grep CONFIG_UID16 /boot/config-`uname -r`
You should se something like:
 CONFIG_UID16=y
== Step-by-step ==
Before you go on please read this!
 1) There is the hard way - do it yourself - if you want that go on with step-by-step
 2) The quick/easy way: download a script that will do it for you: http://dev.alpinelinux.org/~abrodman/create-alpine-sdk.sh
 1) download the script
 2) chmod +x create-alpine-sdk.sh
 3) sudo ./create-alpine-sdk.sh
 -> it will download, unpack and compile everything for you
 -> location: /opt/alpine/alpine-sdk
 
All packages are downloaded from http://dev.alpinelinux.org/alpine/v1.7
* Download latest buildroot package from http://dev.alpinelinux.org/alpine/v1.7/sdk/ and unpack it in /opt/alpine, using the --preserve-permissions option and create a symblink named 1.7 for the development branch.
 sudo mkdir -p /opt/alpine/alpine-sdk
 cd /opt/alpine/alpine-sdk
 wget -q -O - http://dev.alpinelinux.org/alpine/v1.7/sdk/alpine-sdk-latest.tar.bz2\
 | sudo tar -vjxp
 cd ..
 sudo ln -s alpine-sdk 1.7
* Copy your DNS configuration to the build environment and mount proc.
 sudo cp /etc/resolv.conf /opt/alpine/1.7/etc/
 sudo mount -t proc proc /opt/alpine/1.7/proc
* Enter the chroot and change the prompt to reflect your chroot environment
 sudo chroot /opt/alpine/1.7 /bin/bash --login
 echo 'PS1="(chroot)$PS1"' >> /etc/profile
Now we are in the build environment chroot.
* Download latest portage snapshot portage-latest.tar.bz2 from Gentoo and unpack it to /usr
 cd /usr
 wget -q -O - http://mirror.gentoo.se/snapshots/portage-latest.tar.bz2 portage-latest.tar.bz2 | tar -vjx
* Check out the alpine-portage overlay from svn.
 svn co svn://svn.alpinelinux.org/alpine-portage/trunk /usr/alpine-portage
* Download all the tbz2 packages into the var/cache/packages directory. This is probably easiest with rsync.
 rsync -rauv rsync://rsync.alpinelinux.org/alpine/v1.7/tbz2/* /var/cache/packages/
* Check out the alpine-builder scripts in usr/src/
 svn co svn://svn.alpinelinux.org/alpine-builder/trunk /usr/src/alpine
NOTE: The trunk is constantly changing. You might want to use a tagged release like svn://svn.alpinelinux.org/alpine-builder/tags/release-1.7.7
* Configure portage to use the config from alpine-builder.
 
 rm -r /etc/make.conf /etc/portage
 ln -s /usr/src/alpine/sdk/etc/make.conf /etc
 ln -s /usr/src/alpine/sdk/etc/portage /etc
* Update the portage tree (this takes some time first time you do it)
 emerge --sync
* Build the alpine images (iso, usb, flash, etc.)
 cd /usr/src/alpine
 make
Failure compiling ipp2p: just manually 'emerge iptables' and issue 'make' again.
If you get failures while building kernel drivers then you can workaround that by commenting out the specific in /usr/src/alpine/kernel/generic/drivers.
NOTE when leaving chroot: When leaving your chroot, you should unmount the /proc
 exit
 sudo umount /opt/alpine/1.7/proc
== Updating the build env. ==
If you already setup the build env earlier and only want to enter it, update it and maybe create a iso, then this part of the documentation is what you are looking for.
* Mount proc.
 sudo mount -t proc proc /opt/alpine/1.7/proc
* Enter the chroot and change the prompt to reflect your chroot environment
 sudo chroot /opt/alpine/1.7 /bin/bash --login
Now we are in the build environment chroot.
* Update the portage snapshot from Gentoo
 emerge --sync
When emerge has done syncing, you could be advised to update the portage. In such case, you just follow instructions.
One instruction could be "* To update portage, run 'emerge portage'".
 emerge portage
Another case could be that you see "* IMPORTANT: x config files in '/etc' need updating.". In that case run the dispatch-conf tool.
 dispatch-conf
In most cases (when using the 'dispatch-conf') you should use the new config (by pressing 'u' in the console).
* Check out the alpine-portage overlay from svn.
 cd /usr/alpine-portage && svn up
* Download all the tbz2 packages into the var/cache/packages directory. This is probably easiest with rsync.
 rsync -rauv rsync://distrib-coffee.ipsl.jussieu.fr/pub/linux/alpine/alpine/v1.7/tbz2/* /var/cache/packages/
* Check out the alpine-builder scripts in usr/src/
 cd /usr/src/alpine && svn up
* Build the alpine images (iso, usb, flash, etc.)
 cd /usr/src/alpine/iso
 make iso
NOTE when leaving chroot: When leaving your chroot, you should unmount the /proc
 exit
 sudo umount /opt/alpine/1.7/proc
Category:Development