166 lines
5.7 KiB
ReStructuredText
166 lines
5.7 KiB
ReStructuredText
===================
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source-repositories
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===================
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With this element other elements can register their installation source by
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placing their details in the file ``source-repository-*``.
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source-repository-* file format
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-------------------------------
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The plain text file format is space separated and has four mandatory fields
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optionally followed by fields which are type dependent::
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<name> <type> <destination> <location> [<ref>]
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``name``
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Identifier for the source repository. Should match the file suffix.
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``type``
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Format of the source. Either ``git``, ``tar``, ``package`` or ``file``.
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``destination``
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Base path to place sources.
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``location``
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Resource to fetch sources from. For ``git`` the location is cloned. For
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``tar`` it is extracted.
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``ref`` (optional). Meaning depends on the ``type``:
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``file``: unused/ignored.
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``git``: a git reference to fetch. A value of "``*``" prunes and fetches all
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heads and tags. Defaults to ``master`` if not specified.
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``tar``:
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| "``.``" extracts the entire contents of the tarball.
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| "``*``" extracts the contents within all its subdirectories.
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| A subdirectory path may be used to extract only its contents.
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| A specific file path within the archive is **not supported**.
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The lines in the source-repository scripts are eval'd, so they may contain
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environment variables.
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The ``package`` type indicates the element should install from packages onto
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the root filesystem of the image build during the ``install.d`` phase. If the
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element provides an <element-name>-package-install directory, symlinks will be
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created for those scripts instead.
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``git`` and ``tar`` are treated as source installs. If the element provides an
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<element-name>-source-install directory under it's ``install.d`` hook directory,
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symlinks to the scripts in that directory will be created under ``install.d`` for
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the image build.
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For example, the nova element would provide::
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nova/install.d/nova-package-install/74-nova
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nova/install.d/nova-source-install/74-nova
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source-repositories will create the following symlink for the package install
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type::
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install.d/74-nova -> nova-package-install/74-nova
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Or, for the source install type::
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install.d/74-nova -> nova-source-install/74-nova
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All other scripts that exist under ``install.d`` for an element will be executed as
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normal. This allows common install code to live in a script outside of
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<element-name>-package-install or <element-name>-source-install.
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If multiple elements register a source location with the same <destination>
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then source-repositories will exit with an error. Care should therefore be taken
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to only use elements together that download source to different locations.
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The repository paths built into the image are stored in
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etc/dib-source-repositories, one repository per line. This permits later review
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of the repositories (by users or by other elements).
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The repository names and types are written to an environment.d hook script at
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01-source-repositories-environment. This allows later hook scripts during the
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install.d phase to know which install type to use for the element.
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An example of an element "custom-element" that wants to retrieve the ironic
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source from git and pbr from a tarball would be:
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*Element file: elements/custom-element/source-repository-ironic*::
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ironic git /usr/local/ironic https://opendev.org/openstack/ironic.git
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*File : elements/custom-element/source-repository-pbr*::
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pbr tar /usr/local/pbr http://tarballs.openstack.org/pbr/pbr-master.tar.gz .
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diskimage-builder will then retrieve the sources specified and place them
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at the directory ``<destination>``.
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Override per source
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-------------------
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A number of environment variables can be set by the process calling
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diskimage-builder which can change the details registered by the element, these
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are:
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``DIB_REPOTYPE_<name>`` : change the registered type
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``DIB_REPOLOCATION_<name>`` : change the registered location
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``DIB_REPOREF_<name>`` : change the registered reference
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For example if you would like diskimage-builder to get ironic from a local
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mirror you would override the ``<location>`` field and could set:
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.. sourcecode:: sh
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DIB_REPOLOCATION_ironic=git://localgitserver/ironic.git
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*As you can see above, the \<name\> of the repo is used in several bash
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variables. In order to make this syntactically feasible, any characters not in
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the set \[A-Za-z0-9_\] will be converted to \_*
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*For instance, a repository named "diskimage-builder" would set a variable called
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"DIB_REPOTYPE_diskimage_builder"*
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Alternatively if you would like to use the keystone element and build an image with
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keystone from a stable branch *stable/grizzly* then you would set:
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.. sourcecode:: sh
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DIB_REPOREF_keystone=stable/grizzly
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If you wish to build an image using code from a Gerrit review, you can set
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``DIB_REPOLOCATION_<name>`` and ``DIB_REPOREF_<name>`` to the values given by
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Gerrit in the fetch/pull section of a review. For example, setting up Nova with
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change 61972 at patchset 8:
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.. sourcecode:: sh
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DIB_REPOLOCATION_nova=https://review.opendev.org/openstack/nova
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DIB_REPOREF_nova=refs/changes/72/61972/8
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Alternate behaviors
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-------------------
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Override git remote
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^^^^^^^^^^^^^^^^^^^
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The base url for all git repositories can be set by use of:
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``DIB_GITREPOBASE``
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So setting ``DIB_GITREPOBASE=https://github.com/`` when the repo location is
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set to https://opendev.org/openstack/nova.git will result in use of the
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https://github.com/openstack/nova.git repository instead.
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Disable external fetches
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^^^^^^^^^^^^^^^^^^^^^^^^
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When doing image builds in environments where external resources are not allowed,
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it is possible to disable fetching of all source repositories by including an
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element in the image that sets ``NO_SOURCE_REPOSITORIES=1`` in an
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``environment.d`` script.
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