97c01e48ed
Currently we have all our elements and library files in a top-level directory and install them into <root>/share/diskimage-builder/[elements|lib] (where root is either / or the root of a virtualenv). The problem with this is that editable/development installs (pip -e) do *not* install data_files. Thus we have no canonical location to look for elements -- leading to the various odd things we do such as a whole bunch of guessing at the top of disk-image-create and having a special test-loader in tests/test_elements.py so we can run python unit tests on those elements that have it. data_files is really the wrong thing to use for what are essentially assets of the program. data_files install works well for things like config-files, init.d files or dropping documentation files. By moving the elements under the diskimage_builder package, we always know where they are relative to where we import from. In fact, pkg_resources has an api for this which we wrap in the new diskimage_builder/paths.py helper [1]. We use this helper to find the correct path in the couple of places we need to find the base-elements dir, and for the paths to import the library shell functions. Elements such as svc-map and pkg-map include python unit-tests, which we do not need tests/test_elements.py to special-case load any more. They just get found automatically by the normal subunit loader. I have a follow-on change (I69ca3d26fede0506a6353c077c69f735c8d84d28) to move disk-image-create to a regular python entry-point. Unfortunately, this has to move to work with setuptools. You'd think a symlink under diskimage_builder/[elements|lib] would work, but it doesn't. [1] this API handles stuff like getting files out of .zip archive modules, which we don't do. Essentially for us it's returning __file__. Change-Id: I5e3e3c97f385b1a4ff2031a161a55b231895df5b |
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| .. | ||
| binary-deps.d | ||
| dracut-drivers.d | ||
| environment.d | ||
| extra-data.d/scripts/module | ||
| init.d | ||
| install.d | ||
| post-install.d | ||
| README.rst | ||
| element-deps | ||
| pkg-map | ||
| source-repository-dracut | ||
README.rst
dracut-ramdisk
Build Dracut-based ramdisks
This is an alternative to the ramdisk element that uses Dracut to provide the base system functionality instead of Busybox.
For elements that need additional drivers in the ramdisk image, a dracut-drivers.d feature is included that works in a similar fashion to the binary-deps.d feature. The element needing to add drivers should create a dracut-drivers.d directory and populate it with a single file listing all of the kernel modules it needs added to the ramdisk. Comments are not supported in this file. Note that these modules must be installed in the chroot first.
By default, the virtio, virtio_net, and virtio_blk modules are included so that ramdisks are able to function properly in a virtualized environment.