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 svn13
$ cat <<EOF >> $HGRCPATH
> [extensions]
> mq =
> [diff]
> nodates = 1
> [subrepos]
> allowed = true
> svn:allowed = true
> EOF
fn to create new repository, and cd into it
$ mkrepo() {
> hg init $1
> cd $1
> hg qinit
> }
handle svn subrepos safely
$ svnadmin create svn-repo-2499
$ SVNREPOPATH=`pwd`/svn-repo-2499/project
$ SVNREPOURL="`"$PYTHON" $TESTDIR/svnurlof.py \"$SVNREPOPATH\"`"
$ mkdir -p svn-project-2499/trunk
$ svn import -qm 'init project' svn-project-2499 "$SVNREPOURL"
qnew on repo w/svn subrepo
$ mkrepo repo-2499-svn-subrepo
$ svn co "$SVNREPOURL"/trunk sub
Checked out revision 1.
$ echo 'sub = [svn]sub' >> .hgsub
$ hg add .hgsub
$ hg status -S -X '**/format'
A .hgsub
$ hg qnew -m0 0.diff
$ cd sub
$ echo a > a
$ svn add a
A a
$ svn st
A* a (glob)
$ cd ..
$ hg status -S # doesn't show status for svn subrepos (yet)
$ hg qnew -m1 1.diff
abort: uncommitted changes in subrepository "sub"
[255]
$ cd ..