openstack/diskimage-builder
Code Issues Proposed changes
f0b70211c6
diskimage-builder/diskimage_builder/elements/svc-map/README.rst
Ian Wienand 97c01e48ed Move elements & lib relative to diskimage_builder package 
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
2016-11-01 17:27:41 -07:00

3.1 KiB
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svc-map

Map service names to distro specific services.

Provides the following:

  • bin/svc-map

    usage: svc-map [-h] SERVICE

    Translate service name to distro specific name.

    optional arguments:

    -h, --help show this help message and exit

  • Any element may create its own svc-map YAML config file using the one of 3 sections for the distro/family/ and or default. The family is set automatically within svc-map based on the supplied distro name. Families include:

    • redhat: includes centos, fedora, and rhel distros
    • debian: includes debian and ubuntu distros
    • suse: includes the opensuse distro

    The most specific section takes priority. Example for Nova and Glance (NOTE: default is using the common value for redhat and suse families)

    The key used for the service name should always be the same name used for the source installation of the service. The svc-map script will check for the source name against systemd and upstart and return that name if it exists instead of the mapped name.

    Example format for Nova:

    nova-api:
  default: openstack-nova-api
  debian: nova-api
nova-cert:
  default: openstack-nova-cert
  debian:  nova-cert
nova-compute:
  default: openstack-nova-compute
  debian: nova-compute
nova-conductor:
  default: openstack-nova-conductor
  debian: nova-conductor
nova-consoleauth:
  default: openstack-nova-console
  debian: nova-console

    Example format for Glance:

    glance-api:
  debian: glance-api
  default: openstack-glance-api
glance-reg:
  debian: glance-reg
  default: openstack-glance-registry

    If the distro is of the debian family the combined services file would be:

    nova-cert: nova-cert
nova-compute: nova-compute
glance-api: glance-api
nova-conductor: nova-conductor
nova-api: nova-api
glance-reg: glance-reg
nova-consoleauth: nova-console

    If the distro is of the suse or redhat families the combined services file would be:

    nova-cert: openstack-nova-cert
nova-compute: openstack-nova-compute
glance-reg: openstack-glance-registry
nova-conductor: openstack-nova-conductor
glance-api: openstack-glance-api
nova-consoleauth: openstack-nova-console
nova-api: openstack-nova-api

    Example commands using this format:

    svc-map nova-compute

Returns: openstack-nova-compute

svc-map nova-compute

Returns: openstack-nova-compute

svc-map nova-compute

Returns: nova-compute

  • This output can be used to filter what other tools actually install (install-services can be modified to use this for example)

  • If you pass more than one service argument, the result for each service is printed on its own line.

  • Individual svc-map files live within each element. For example if you have created an Apache element your svc-map YAML file should be created at elements/apache/svc-map.