Ian Wienand b71d1c60d2 package-installs : allow a list of parameters

The change Ia6f10741fa6be24b11d6991c8a6b6e07951ff68d introduced having
"when:" as a list of values.  However, this was actually not
sufficient to express the logic required for arm64/x86_64/xenial
kernel matching we wanted.

Because the package name is a key, we can't have multiple entires in
the package-map YAML files.  This means we can't do more advanced
matching and thus we need to be able to match through multiple
parameters.  Similar to Ia6f10741fa6be24b11d6991c8a6b6e07951ff68d we
modify the matching rules to allow a list.

A an example of using this is provided in the README.rst, and this
same example worked through by the unit tests.

This also slightly updates the matching logic to be more sequential.
After each check we either continue on or log the failure and continue
to the next check (rather than set a list of flags then check that at
the end).  This makes it much easier to understand what is being
matched in the logging output from the tool.

Change-Id: Idff7b067ad4255e6fc4138f7eff313a81b75c8ba

2020-05-27 06:17:57 +10:00

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package-installs

The package-installs element allows for a declarative method of installing and uninstalling packages for an image build. This is done by creating a package-installs.yaml or package-installs.json file in the element directory.

In order to work on Gentoo hosts you will need to manually install dev-python/pyyaml.

example package-installs.yaml

libxml2:
grub2:
  phase: pre-install.d
networkmanager:
  uninstall: True
os-collect-config:
  installtype: source
linux-image-amd64:
  arch: amd64
dmidecode:
  not-arch: ppc64, ppc64le
lshw:
  arch: ppc64, ppc64le
python-dev:
  dib_python_version: 2
python3-dev:
  dib_python_version: 3
libssl-dev:
  build-only: True
package-a:
  when: DIB_USE_PACKAGE_A = 1
package-b:
  when: DIB_USE_PACKAGE_A != 1

example package-installs.json

{
"libxml2": null,
"grub2": {"phase": "pre-install.d"},
"networkmanager": {"uninstall": true}
"os-collect-config": {"installtype": "source"}
}

Setting phase, uninstall, or installtype properties for a package overrides the following default values:

phase: install.d
uninstall: False
installtype: * (Install package for all installtypes)
arch: * (Install package for all architectures)
dib_python_version: (2 or 3 depending on DIB_PYTHON_VERSION, see dib-python)

Setting the installtype property causes the package only to be installed if the specified installtype would be used for the element. See the diskimage-builder docs for more information on installtypes.

Setting build-only will cause the package to be added both to the list of packages to be installed and to the list of packages to be uninstalled. This allows expressing build-time dependencies that should not end up in the final image.

The arch property is a comma-separated list of architectures to install for. The not-arch is a comma-separated list of architectures the package should be excluded from. Either arch or not-arch can be given for one package - not both. See documentation about the ARCH variable for more information.

The when property is a simple = or != match on a value in an environment variable. If the given environment variable matches the operation and value, the package is installed. If the variable is not available in the environment, an exception is raised (thus defaults will likely need to be provided in environment.d files or similar for flags used here). For example, to install an extra package when a feature is enabled:

package:
  when: DIB_FEATURE_FLAG=1

To install package when DIB_FEATURE_FLAG=0 but other_package when DIB_FEATURE_FLAG=1 (i.e. toggle between two packages), you can use something like:

package:
  when: DIB_FEATURE_FLAG=0
other_package:
  when: DIB_FEATURE_FLAG!=0

You can also use a list of items in the when statement, which will be effectively combined with and.

If you need to filter multiple paths for a single package, you can make the parameters a list. For example, if linux-image-generic package should be installed when DIB_UBUNTU_KERNEL = linux-image-generic is set except on arm64 Xenial hosts, where we would like to install linux-generic-hwe-16.04 you could use the following:

linux-image-generic:
 - not-arch: arm64
   when: DIB_UBUNTU_KERNEL = linux-image-generic
 - arch: arm64
   when:
    - DIB_RELEASE != xenial
    - DIB_UBUNTU_KERNEL = linux-image-generic

linux-generic-hwe-16.04:
  arch: arm64
  when:
   - DIB_RELEASE = xenial
   - DIB_UBUNTU_KERNEL = linux-image-generic

DEPRECATED: Adding a file under your elements pre-install.d, install.d, or post-install.d directories called package-installs-<element-name> will cause the list of packages in that file to be installed at the beginning of the respective phase. If the package name in the file starts with a "-", then that package will be removed at the end of the install.d phase.

Using post-install.d for cleanup

Package removal is done in post-install.d at level 95. If you a running cleanup functions before this, you need to be careful not to clean out any temporary files relied upon by this element. For this reason, generally post-install cleanup functions should occupy the higher levels between 96 and 99.

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package-installs

Using post-install.d for cleanup

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