Install mission critical dependencies from source, improve dep handling #125
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vfetch added to perform metadata-backed file get+verify operations, storing the asset in a cache directory where it can be retrieved transparently on subsequent invocations. Add new global IG top level cache dir keyed off workroot.
To decouple from reliance on distro-provided packages for the build machine, introduce a new lightweight build framework for building packages from source. rpi-image-gen can use this scheme at bootstrap to ensure it always has required versions of mission critical programs. Build bdebstrap and genimage using this scheme, installing them to a private sysroot where they can be used for all builds. The trade off is a short on-off delay on the initial rpi-image-gen invocation plus additional distro deps. Longer term, distro dependencies will be reduced signifficantly by introducing the ability to run builds in a container. Fixes: raspberrypi#113
Extend the config parser to support env keys. Variables defined under the env key will be present in the build environment.
Re-work the dependency installation mech to support different categories of host dependencies and validate if a program installed as a dependency can be located post-install. Applying categories to dependencies should be beneficial when introducing containerised execution support. Write bootstrap information to a new output dir declared by the sys base layer. Fixes raspberrypi#106
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Introduce a mini build system framework to bootstrap a private sysroot for mission critical packages, and use it to build bdebstrap and genimage.
The trade-off is a short on-off delay on first rpi-image-gen invocation plus additional build machine dependencies (very likely already installed by default on a normal build workstation).
All tools that are built are installed to a standalone sysroot dir which is completely isolated from distro installed packages, and can be reused across all rpi-image-gen device builds.
Fixes #113 #106