qubes-doc/QubesBuilder.md

---
layout: doc
title: QubesBuilder
permalink: /doc/QubesBuilder/
redirect_from: /wiki/QubesBuilder/
---

Building Qubes from scratch
===========================

We have a fully automated build system for Qubes, that downloads, builds and
packages all the Qubes components, and finally should spit out a ready-to-use
installation ISO.

In order to use it one should use an rpm-based distro, like Fedora :) and should ensure the following packages are installed:

-   git
-   createrepo
-   rpm-build
-   make
-   wget
-   rpmdevtools
-   python-sh
-   dialog
-   rpm-sign

Unusually one can install those packages by just issuing:

{% highlight trac-wiki %}
sudo yum install git createrepo rpm-build make wget rpmdevtools python-sh dialog rpm-sign
{% endhighlight %}

The build system creates build environments in chroots and so no other packages are needed on the host. All files created by the build system are contained within the qubes-builder directory. The full build requires some 25GB of free space, so keep that in mind when deciding where to place this directory.

The build system is configured via builder.conf file -- one should copy the attached builder.conf.default, and modify it as needed, e.g.:

{% highlight trac-wiki %}
cp builder.conf.default builder.conf 
# edit the builder.conf file and set the following variables: 
# (make sure to leave no spaces around '=' sign!) 
NO_SIGN=1

# As time of writing this, the default for Qubes 2 Dom0 is fc20
# and VMs is fc20 so if you want to build Qubes 2
DIST_DOM0=fc20
DISTS_VM=fc20
{% endhighlight %}

One additional useful requirement is that 'sudo root' work without any prompt, which is default on most distros (e.g. 'sudo bash' brings you the root shell without asking for any password). This is important as the builder needs to switch to root and then back to user several times during the build process.

Additionally, if building with signing enabled (so NO\_SIGN is not set), one must adjust \~/.rpmmacro file so that it point to the GPG key used for package signing, e.g.:

{% highlight trac-wiki %}
%_signature gpg
%_gpg_path /home/user/.gnupg
%_gpg_name AC1BF9B3  # <-- Key ID used for signing
{% endhighlight %}

It is also recommended to use an empty passphrase for the private key used for signing. Contrary to a popular belief, this doesn't affect your key or sources security -- if somebody compromised your system, then the game is over, whether you use additional passphrase for the key or not.

So, to build Qubes one would do:

{% highlight trac-wiki %}
# Import the Qubes master key 
gpg --recv-keys 0x36879494 

# Verify its fingerprint, set as 'trusted'. 
# This is described here: 
# https://www.qubes-os.org/doc/VerifyingSignatures

wget http://keys.qubes-os.org/keys/qubes-developers-keys.asc 
gpg --import qubes-developers-keys.asc 

git clone git://github.com/QubesOS/qubes-builder.git qubes-builder 
cd qubes-builder 

cp example-configs/qubes-os-master.conf builder.conf 
# edit the builder.conf file and set the following variables: 
# (make sure to leave no spaces around '=' sign!) 
# NO_SIGN="1"

# Download all components:

make get-sources

# And now to build all Qubes rpms (this will take a few hours): 

make qubes 

# ... and then to build the ISO 

make iso 
{% endhighlight %}

And this should produce a shiny new ISO.

You can also build selected component separately. Eg. to compile only gui virtualization agent/daemon:

    make gui-daemon

Full list you can get from make help. For advanced use and preparing sources
for use with [QubesBuilder](/doc/QubesBuilder/) take a look at [doc directory
in QubesBuilder](https://github.com/marmarek/qubes-builder/tree/master/doc) or 
[QubesBuilderDetails](/doc/QubesBuilderDetails/) page.

Making customized build
-----------------------

### Manual source modification

If you want to somehow modify sources, you can also do it, here are some basic steps:

1.  Download qubes-builder as described above (if you want to use marmarek's branches, you should also download qubes-builder from his repo - replace 'QubesOS' with 'marmarek' in above git clone command)
2.  Edit builder.conf (still the same as above), some useful additions:
    -   You can also set GIT\_PREFIX="marmarek/qubes-" to use my repo instead of "mainstream" - it contains newer (but less tested) versions

1.  Download unmodified sources

    make get-sources

1.  **Make your modifications here**

1.  Build the Qubes
     `make qubes` actually is just meta target which build all required
     components in correct order. List of components is configured in
     builder.conf. You can also check the current value at the end of `make
     help`, or using `make build-info`. 

> `get-sources` is already done, so continue with the next one. You can skip `sign-all` if you've disabled signing
>
> {% highlight trac-wiki %}
> make xen core kernel gui addons docs template kde-dom0 installer qubes-manager dom0-updates
> {% endhighlight %}

1.  build iso installation image

    make iso

Code verification keys management
=================================

[QubesBuilder](/doc/QubesBuilder/) by default verifies signed tags on every downloaded code. Public keys used for that are stored in `keyrings/git`. By default Qubes developers' keys are imported automatically, but if you need some additional keys (for example your own), you can add them using:

{% highlight trac-wiki %}
GNUPGHOME=$PWD/keyrings/git gpg --import /path/to/key.asc
GNUPGHOME=$PWD/keyrings/git gpg --edit-key ID_OF_JUST_IMPORTED_KEY
# here use "trust" command to set key fully or ultimately trusted - only those keys are accepted by QubesBuilder
{% endhighlight %}

All Qubes developers' keys are signed by the Qubes Master Signing Key (which is set as ultimately trusted key), so are trusted automatically.

If you are the owner of Master key and want to revoke such signature, use the `revsig` gpg key edit command and update the key in qubes-developers-keys.asc - now the key will be no longer trusted (unless manually set as such).