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Building template using Disposable VM

Qubes builder do support building the whole template (including all the VM components) in DispVM. This has two advantages:

  1. You start with clean environment, so the build process do not depend on any local (potentially uncommited) changes.
  2. You do not need to trust all the build scripts, including postinstallation scripts of installed packages, configuration scripts etc. Note: while you do not need to trust those scripts during build process, this doesn't apply to the result package itself - if the template is compromised during build process, all the VMs based on this template will be compromised too. But only that VMs.

To use this feature you'll need to install a few Qubes RPC services:

  1. In dom0:
  • qubesbuilder.ExportDisk
  • qubesbuilder.AttachDisk
  1. In your VM (from where you start the build process);
  • qubesbuilder.CopyTemplateBack

And respective policies for them. RPC services file are in rpc-services subdirectory, to install them - copy those files to /etc/qubes-rpc (in dom0 for first two services, in VM for the third one). There are also example policies to be placed in /etc/qubes-rpc/policy (in dom0, for all the services) - you need to update your devel VM name in qubesbuilder.ExportDisk and qubesbuilder.CopyTemplateBack policy.

When you've done, you probably want to adjust some builder.conf settings. You have two options:

  1. You can use the same builder.conf for building the template in DispVM. In this case you don't need to do anything.
  2. You can use separate builder.conf, even different one for every template type. The builder.conf file can be provided using BUILDER_TEMPLATE_CONF setting. That variable contains space-separated list of <dist>:<location> pairs, where is code name of template (like fc20, or wheezy+whonix-workstation), and is path to the config file. Alternatively you can, instead of plain path, provide git repo location, which contains config/builder.conf file. In this case consists of three parameters:

That builder.conf should contain all the settings needed to build the template itself. As the file will be copied alone, it should be self-contained at least for the first get-sources stage (to download builder and its plugins). Then it can include other files from builder builder plugins, if needed.

Your original builder.conf should contain settings how to package the template, especially how it should be named (TEMPLATE_LABEL option).

Then you can start the build process. To build all selected templates (according to DISTS_VM setting) - each in new DispVM:

$ make template-in-dispvm

Or alternatively you can build just selected one by appending its code name:

$ make template-in-dispvm-fc21

Details on building template in Disposable VM

When you execute make template-in-dispvm it call script scripts/build_full_template_in_dispvm, which:

  1. Create an empty disk image.
  2. Mount it, copy qubes-builder there, including provided config or key to verify git tag.
  3. Unmount that image.
  4. Generate random key, associate the disk image with it (qubesbuilder.ExportDisk service).
  5. Launch new DispVM using qubes.VMShell service, pass there a script and a key generated in previous step.
  6. Inside the DispVM mount exported disk image (qubesbuilder.AttachDisk service), optionally clone repo to extract config file (of course verify git tag before accessing any file there).
  7. Still inside DispVM, download sources according to builder.conf (that one pointed by BUILDER_TEMPLATE_CONF setting). First builder component is downloaded to possibly load some builder extensions.
  8. When all the sources are downloaded, start the build process calling make qubes-vm template.
  9. The last step is to transfer just built root.img and default lists of appmenus back to original VM (qubesbuilder.CopyTemplateBack service). This process uses the same key as in step 4 to authorize the transfer.
  10. At this stage DispVM is destroyed, including disk image created in the first step.
  11. The last step is to create rpm package to carry root.img and appmenus list. It is important to note that it doesn't parse root.img in any way, just make an archive with it.
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