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 | ||
| init.d | ||
| element-deps | ||
| package-installs.yaml | ||
| README.rst | ||
hwdiscovery
A ramdisk to report the hardware of a machine to an inventory service.
This will collect up some basic information about the hardware it boots on:
- CPU cores
- RAM
- Disk
- NIC mac address
This information will then be collated into a JSON document, base64 encoded and passed, via HTTP POST, to a URL that you must specify on the kernel commandline, thus:
HW_DISCOVERY_URL=http://1.2.3.4:56/hw_script.asp
This is currently fairly fragile as there can be a huge variability in the number of disks/NICs in servers and how they are configured.
If other elements wish to inject data into the hardware discovery data, they can - they should be specified before hwdiscovery to the image building script, and they should contain something like this in their init fragment:
- _vendor_hwdiscovery_data="$_vendor_hwdiscovery_data
-
"some vendor key" : "some data you care about", "some other vendor key" : "some other data you care about","
Note that you are essentially feeding JSON into the main hwdiscovery JSON.
This will allow any number of vendor specific hwdiscovery elements to chain together their JSON fragments and maintain consistency.