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a5e1820702
Summary:
This splits out the logic in the `fsmonitor` extension that is responsible for
publishing `hg.filemerge` and `hg.update` state changes to Watchman into
its own extension, `hgevents`. This is because we want the behavior of
`hgevents` when Hg is running in Eden, but we do not want the remaining
behavior of `fsmonitor` when Hg is running in Eden, so splitting the logic
into separate extensions is the most straightforward way to achieve that.
To achieve the split, we move some more logic that is common to both
`fsmonitor` and `hgevents` out of `hgext/fsmonitor/__init__.py` and into
`hgext/extlib/watchmanclient/__init__.py`. Then we move these lines
out of `extsetup()` in `fsmonitor` to create `extsetup()` in `hgevents`:
```
extensions.wrapfunction(merge, 'update', wrapupdate)
extensions.wrapfunction(filemerge, '_xmerge', _xmerge)
```
We also have to pull all of the transitive dependencies for this logic
into `hgevents`.
Finally, we also have to define a `reposetup()` function in `hgevents`
that does a subset of what `reposetup()` does in `fsmonitor`. Specifically,
it ensures that a Watchman client is created for a `repo`, as appropriate,
so that it can be used to dispatch state changes to Watchman in
`state_filemerge` and `state_update`.
Note that the utility functions `createclientforrepo()` and
`getclientforrepo()` have been added to ensure that only one
Watchman client is created (and shared) when both `fsmonitor`
and `hgevents` are enabled.
Today, when an Hg repo is created in Eden, we set `extensions.fsmonitor=!`
in the `.hg/hgrc`:
diffusion/FBS/browse/master/fbcode/eden/hooks/hg/post-clone.py$69
Therefore, to get existing repos (both Eden and non-Eden) to pick up
the `hgevents` extension automatically, we add it to the list of
`[extensions]` in `common.rc`:
diffusion/FBS/browse/master/fbcode/scm/hg/fb/staticfiles/etc/mercurial/repo-specific/common.rc$53-60
as this is where `fsmonitor` is configured. We do not enable it in
`scm/hg/fb/staticfiles/etc/mercurial/facebook.rc` because
there is no reason to enable `hgevents` on Hg servers. Therefore, we
also decline to add `hgevents` to the set of `DEFAULT_EXTENSIONS` in
`scm/hg/mercurial/extensions.py`.
Reviewed By: quark-zju
Differential Revision: D8003628
fbshipit-source-id: 4f23881f8c25f4638f5475c292537b0352ae8d15
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| state.py | ||