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Change-Id: I992dc0c1d40f563ade56a833162d409b02be90a0
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This is needed for distbuild to deserialise based on the split rules on
the node that did the graph calculation, rather than the node that does
the building.
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This helps debugging issues with rule matching, since SplitRules can be
print-statemented
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When overriding a default chunk splitting rule, the use 'break' would
mean that some of the other default chunk split rules might be ignored.
This isn't ever what you want.
I also clarified the current behaviour in a comment. I think in future
we should add a mechanism to extend the default rules, as well as the
current mechanism which allows only replacing them. But that is a
separate issue.
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The Source.__init__() function assumes that the artifact.split_rules
attribute is not None. Rather than complicating that code with error
checks, let's make it always be correct.
Avoids traceback from Source.__init__() when passing a cluster morph to
`morph build`.
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Rationale
=========
This patch series implements the concept of stratum splitting.
For a long time we've had code to split a chunk into multiple artifacts,
however there's not been a way to split strata up, or systems select a
subset of the produced stratum artifacts to be included in the system.
This patch series implements the ability to split strata and have systems
include them in a way which still has the same behaviour if no rules
are specified, but with default rules that split chunk artifacts up into
various components, strata into runtime and development versions and has
systems include everything by default, but can be told to include less.
The default rules have chunk foo split up into -bins, -libs, -devel,
-doc, -locale and -misc.
These rules can be overridden in the chunk morphology by adding the new
'products' field, which lists match rules like the following:
products:
- artifact: libudev
include:
- (usr/)?lib(32|64)?/lubg?udev\..*
- artifact: udev
include:
- (usr/)?s?bin/udev*
- (usr/)?lib(32|64|exec)?/systemd/systemd-udevd
Strata are by default split into -runtime and -devel. -devel by default
contains chunks ending with -devel and -doc, -runtime contains everything
else.
Extra match rules can be added to a stratum similarly to chunks, but
instead of matching file names, they match artifact names.
products:
- artifact: core-python
include:
- "cpython-.*" # lazy shortcut to put all of cpython in this stratum
- "python-.*" # lazy shortcut to include all python chunks in
Additionally, in chunk specs, chunk artifacts may be assigned to stratum
artifacts, this takes precedence over products match rules in the stratum
and the default match rules. Assigning the chunk to `null` will discard
the chunk.
chunks:
...
- name: systemd
...
artifacts:
libudev: foundation-runtime
udev: foundation-runtime
systemd-doc: null
By default a system includes every produced artifact of every stratum
listed. Instead a subset can be specified in the stratum spec as follows:
name: tiny-system
strata:
- name: build-essential
...
artifacts:
- build-essential-runtime
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This introduces a new artifactsplitrule module, which tries to provide a
nice abstraction over matching a sequence of things to a bunch of
outputs, to be used by both chunks splitting, for separating files out
into chunk artifacts, the stratum splitting, where chunks are
aggregated into stratum artifacts, and systems selecting the right
strata to go into the artifact.
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