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Building bitcoin with the gitian-builder host image

These are instructions to build version 0.9.1 of bitcoin with the gitian-host image.

They are based on https://github.com/bitcoin/bitcoin/blob/0.9.1/doc/release-process.md (and more recent versions).

Preparing the gitian environment

First, login into the freshly spawned gitian-host container with 'debian' user.

Install a few extra packages:

sudo apt-get install -y parallel patch

Apply this patch to gitian-builder:

diff --git a/bin/make-base-vm b/bin/make-base-vm
index c1920f3..8a44f13 100755
--- a/bin/make-base-vm
+++ b/bin/make-base-vm
@@ -109,16 +109,3 @@ rm -rf $OUT
 sudo vmbuilder kvm ubuntu --rootsize 10240 --arch=$ARCH --suite=$SUITE --addpkg=$addpkg --removepkg=$removepkg --ssh-key=var/id_dsa.pub --ssh-user-key=var/id_dsa.pub --mirror=$MIRROR --secu
 mv $OUT/*.qcow2 $OUT.qcow2
 rm -rf $OUT
-
-if [ $LXC = "1" ]; then
-    #sudo debootstrap --include=$addpkg --arch=$ARCH $SUITE $OUT-root $MIRROR
-    echo Extracting partition for lxc
-    qemu-img convert $OUT.qcow2 $OUT.raw
-    loop=`sudo kpartx -av $OUT.raw|sed -n '/loop.p1/{s/.*loop\(.\)p1.*/\1/;p}'`
-    sudo cp --sparse=always /dev/mapper/loop${loop}p1 $OUT
-    sudo chown $USER $OUT
-    sudo kpartx -d /dev/loop$loop
-    rm -f $OUT.raw
-    # bootstrap-fixup is done in libexec/make-clean-vm
-fi
-

Afterwards run this script:

#!/bin/bash
set -e

source ~/.bash_profile

export VERSION=0.9.1
git clone https://github.com/bitcoin/bitcoin.git
cd bitcoin
git checkout v${VERSION}
cd ../gitian-builder
mkdir -p var
if [ ! -e var/id_dsa ]; then
  ssh-keygen -t dsa -f var/id_dsa -N ""
fi

export MIRROR_HOST=$GITIAN_HOST_IP
SUITE=precise

echo -e "MIRROR_HOST=$GITIAN_HOST_IP bin/make-base-vm --lxc --arch i386 --suite $SUITE\nMIRROR_HOST=$GITIAN_HOST_IP bin/make-base-vm --lxc --arch amd64 --suite $SUITE" | parallel -j2 || exit $?

function ext_partition() {
	local OUT=$1
	echo Extracting $OUT partition for lxc
	qemu-img convert $OUT.qcow2 $OUT.raw
 	loop=`sudo kpartx -av $OUT.raw|sed -n '/loop.p1/{s/.*loop\(.\)p1.*/\1/;p}'`
	sudo cp --sparse=always /dev/mapper/loop${loop}p1 $OUT
	sudo chown $USER $OUT
	sudo sync
	sleep 5
	sudo kpartx -d /dev/loop$loop
	sudo rm /dev/mapper/loop${loop}p1
	rm -f $OUT.raw
}

ext_partition base-${SUITE}-i386 && \
ext_partition base-${SUITE}-amd64 || exit $?

At this point you have prepared a gitian builder environment for deterministic bitcoin builds. You might want to stop the container and create an image to store away so that in future you can fork from here for new builds.