changing-files: rework the way we store changed files in side-data
We need to store new data so this is a good opportunity to rework this fully.
1) We directly store the list of affected file in the side data:
* This avoid having to fetch and parse the `files` list in the revision in
addition to the sidedata. Making the data more self sufficient.
* This work around situation where that `files` field contains wrong
information, and open the way to other bug fixing (eg:
issue6219)
* The format (fixed initial index, sorted files) allow for fast lookup of
filename within the structure.
* This unify the storage of affected files and copies sources and destination,
limiting the number filename stored redundantly.
* This prepare for the fact we should drop the `files` as soon as we do any
change affecting the revision schema.
* This rely on compression to avoid a significant increase of the changelog.d.
More testing on this will be done before we freeze the final format.
2) We can store additional data:
* The new "merged" field,
* A future "salvaged" set recording files that might have been deleted but have
were still present in the final result.
Differential Revision: https://phab.mercurial-scm.org/D9090
#require test-repo pylint hg10
Run pylint for known rules we care about.
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There should be no recorded failures; fix the codebase before introducing a
new check.
Current checks:
- W0102: no mutable default argument
$ touch $TESTTMP/fakerc
$ pylint --rcfile=$TESTTMP/fakerc --disable=all \
> --enable=W0102,C0321 \
> --reports=no \
> --ignore=thirdparty \
> mercurial hgdemandimport hgext hgext3rd | sed 's/\r$//'
Using config file *fakerc (glob) (?)
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