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# Gitian
Read about the project goals at the "project home page":https://gitian.org/ .
This package can do a deterministic build of a package inside a VM.
## Deterministic build inside a VM
This performs a build inside a VM, with deterministic inputs and outputs. If the build script takes care of all sources of non-determinism (mostly caused by timestamps), the result will always be the same. This allows multiple independent verifiers to sign a binary with the assurance that it really came from the source they reviewed.
## Synopsis:
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Install prereqs:
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sudo apt-get install python-vm-builder qemu-kvm apt-cacher
sudo service apt-cacher start
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Create the base VM for use in further builds (requires sudo, please review the script):
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bin/make-base-vm
Copy any additional build inputs into a directory named _inputs_.
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Then execute the build using a YAML description file (can be run as non-root):
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bin/gbuild <package>-desc.yml
or if you need to specify a commit for one of the git remotes:
bin/gbuild --commit <dir>=<hash> <package>-desc.yml
The resulting report will appear in result/\<package\>-res.yml
## Poking around
* Log files are captured to the _var_ directory
* You can run the utilities in libexec by running `PATH="libexec:$PATH"`
* To start the target VM run `start-target`
* To ssh into the target run `on-target` or `on-target -u root`
* On the target, the _build_ directory contains the code as it is compiled and _install_ contains intermediate libraries
* By convention, the script in \<package\>-desc.yml starts with any environment setup you would need to manually compile things on the target
TODO:
- disable sudo in target, just in case of a hypervisor exploit
- tar and other archive timestamp setter