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Building per-artifact results in undesirable behaviour,
as multiple artifacts are produced for every chunk build.
It therefore makes more sense to build per-source.
This implies that actually, the model of one source per
morphology is wrong and we should move the dependencies
into the source.
Unlike chunks however, where every chunk artifact has the
same dependencies, stratum artifacts can have different
dependencies.
So before we can move the dependencies into the Source,
we need to have as many Sources as Stratum Artifacts.
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Before this change, if a stratum had dependencies listed, then
morph would add that stratum to the list of things to build
multiple times, resulting in more things being built.
This was not a major problem, since it would just result in more cache
lookups than necessary, but lookups are more expensive on remote
artifact caches, and anything attempting to find which artifact would
be the result of a build would get confused by there being many
top-level artifacts with no dependencies.
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This was done with the aid of the pep8 script, available by running
`easy_install pep8`.
It may be worth making this part of ./check, but that will require
putting pep8 into the development tools stratum.
This should be easy, given pep8 has no external dependencies.
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This is because we will need to integrate a RemoteRepoCache and we don't
always want to create a CachedRepo object (in fact, we only want that
for the sources of artifacts we actually need to build). So we'll use
either the local or the remote repo cache to resolve refs and morphology
texts and then later, when actually caching a repo, we'll set the
source.repo member to a CachedRepo object that we can then use to
unpack the sources.
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This is done to avoid a nasty mix of SourcePool lookups using CachedRepo
objects (e.g. for strata within a system) versus lookups using repo names
(e.g for sources within a stratum).
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We will almost always want to look up sources based on the data we find
in morphologies (e.g. chunk sources found in a stratum or strata found
in a system). For that we need to remember the original_ref in addition
to the resolved SHA1 and look up sources using this original ref. The
original ref is therefore also used as part of the hash key in
SourcePool now.
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