[lxc-devel] LXD image creation tool

[Nelo-Thara Wallus]

Morning list,

Docker recently added multi-stage[1] builds, which allow to e.g. build
an application in one layer, then only copying the resulting build to
a new, slimmer, layer, removing the whole build toolchain.

[1]: https://docs.docker.com/engine/userguide/eng-image/multistage-build/

I've wanted something like that for LXD as well, however I only found
maryvilledev/lxb[2], which requires the host to run LXD instead of only
building the tar ball to spec.

[2]: https://github.com/maryvilledev/lxb

Currently I'm working on a prototype at ntnn/lxb[3], however I'd like to
use the structs and functions which already exist in the LXD codebase,
instead of reverse-engineering each step.

[3]: https://github.com/ntnn/lxb

Would you be open to a patch which moves the image spec/metadata
parsing/etc.pp. into its own package, so it can be used as a library by
third party tools?

I'd leave all the actual handling, e.g. importing, exporting, ... in
the lxd package, but functions like detectCompression, unpack{,Image},
compressFile, etc.pp. would be quite handy to not differ between an
image builder and the actual daemon handling the images.

Cheers,
Nelo

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