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Change-Id: I992dc0c1d40f563ade56a833162d409b02be90a0
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We assumed that the sha1 of the tree of the commit of the ref we care
about was sufficient to cache, but `git replace` means that you need to
know the state of other branches too, since anything in refs/replace can
completely change what the tree you check-out is.
This behaviour can be disabled globally by setting
GIT_NO_REPLACE_OBJECTS, so we're going to do that.
If we need to integrate a project that uses git-replace to change the
contents of their git trees then we could support that by:
if any(refs/replace/*):
potentially_replacable_objects = [
`git rev-parse HEAD`,
`git rev-parse HEAD^{commit}`,
`git rev-parse HEAD^{tree}`]
potentially_replacable_objects.extend(
`git ls-tree -r HEAD | awk '{print $3}'`)
# NOTE: doesn't handle submodules, and you'd need to expand this
# set whenever you process a replacement
for object in refs/replace/*:
if basename(object) not in potentially_replacable_objects: continue
cache_key['replacements'][basename(object)] = `git rev-parse $object`
If we were to support this would need to traverse the tree anyway, doing
replacements, so we may as well use libgit to do the checkout anyway,
and list which replacements were used.
However, since the expected use-case of `git replace` is as a better way
to do history grafting, we're unlikely to need it, as it would only have
any effect if it replaced the commit we were using with a different one.
Rubber-stamped-by: Daniel Silverstone
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We want to use file paths to locate morphologies now, so the old model
of get a list of names and hand it those back to get the contents
doesn't really make sense any more.
This abstraction initially came about as one idea I had for moving
morphologies out of the source tree was to put them in something like
git notes, where it's possible to look up information for one commit in
another ref in the repository, at which point this abstraction would
have been flexible enough to handle that as well as in the
However, moving the chunk morphologies into the definitions repository
has other benefits too, so it makes more sense to be honest about using
filenames in the API.
It remains as a single point where we can put the logic for knowing which
files in a repository look like morphologies, but if we need to remove
any further functionality, it should be replaced by a single function.
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MorphologyFinder is a small wrapper on top of GitDirectory that
allows the inspection of morphologies in the repository.
Its purpose is to isolate the logic for reading morphologies into one
place.
It is used by passing a GitDirectory and optionally a ref to the
MorpholgyFinder constructor, then list_morphologies and read_morphology
may be used.
The ref is passed directly to the GitDirectory, so its semantics for
a ref of None or omitted are used. i.e. It uses the working tree.
Ref resolving is deferred until a morphology is listed or read, so
it will not raise an exception for an invalid ref until then.
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