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inotify: server: new data structure to keep track of changes....
inotify: server: new data structure to keep track of changes. == Rationale for the new structure == Current structure was a dictionary tree. One directory was tracked as a dictionary: - keys: file/subdir name - values: - for a file, the status (a/r/m/...) - for a subdir, the directory representing the subdir It allowed efficient lookups, no matter of the type of the terminal leaf: for part in path.split('/'): tree = tree[part] However, there is no way to represent a directory and a file with the same name because keys are conflicting in the dictionary. Concrete example: Initial state: root dir |- foo (file) |- bar (file) # data state is: {'foo': 'n', 'bar': 'n'} Remove foo: root dir |- bar (file) # Data becomes {'foo': 'r'} until next commit. Add foo, as a directory, and foo/barbar file: root dir |- bar (file) |-> foo (dir) |- barbar (file) # New state should be represented as: {'foo': {'barbar': 'a'}, 'bar': 'n'} however, the key "foo" is already used and represents the old file. The dirstate: D foo A foo/barbar cannot be represented, hence the need for a new structure. == The new structure == 'directory' class. Represents one directory level. * Notable attributes: Two dictionaries: - 'files' Maps filename -> status for the current dir. - 'dirs' Maps subdir's name -> directory object representing the subdir * methods - walk(), formerly server.walk - lookup(), old server.lookup - dir(), old server.dir This new class allows embedding all the tree walks/lookups in its own class, instead of having everything mixed together in server. Incidently, since files and directories are not stored in the same dictionaries, we are solving the previous key conflict problem. The small drawback is that lookup operation is a bit more complex: for a path a/b/c/d/e we have to check twice the leaf, if e is a directory or a file.
Henrik Stuart - - Load All Authors

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test-convert-cvs-builtincvsps
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#!/bin/sh
"$TESTDIR/hghave" cvs || exit 80
cvscall()
{
cvs -f "$@"
}
hgcat()
{
hg --cwd src-hg cat -r tip "$1"
}
echo "[extensions]" >> $HGRCPATH
echo "convert = " >> $HGRCPATH
echo "graphlog = " >> $HGRCPATH
echo "[convert]" >> $HGRCPATH
echo "cvsps=builtin" >> $HGRCPATH
echo % create cvs repository
mkdir cvsrepo
cd cvsrepo
CVSROOT=`pwd`
export CVSROOT
CVS_OPTIONS=-f
export CVS_OPTIONS
cd ..
cvscall -q -d "$CVSROOT" init
echo % create source directory
mkdir src-temp
cd src-temp
echo a > a
mkdir b
cd b
echo c > c
cd ..
echo % import source directory
cvscall -q import -m import src INITIAL start
cd ..
echo % checkout source directory
cvscall -q checkout src
echo % commit a new revision changing b/c
cd src
sleep 1
echo c >> b/c
cvscall -q commit -mci0 . | grep '<--' |\
sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
cd ..
echo % convert fresh repo
hg convert src src-hg | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
hgcat a
hgcat b/c
echo % convert fresh repo with --filemap
echo include b/c > filemap
hg convert --filemap filemap src src-filemap | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
hgcat b/c
hg -R src-filemap log --template '{rev} {desc} files: {files}\n'
echo % commit new file revisions
cd src
echo a >> a
echo c >> b/c
cvscall -q commit -mci1 . | grep '<--' |\
sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
cd ..
echo % convert again
hg convert src src-hg | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
hgcat a
hgcat b/c
echo % convert again with --filemap
hg convert --filemap filemap src src-filemap | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
hgcat b/c
hg -R src-filemap log --template '{rev} {desc} files: {files}\n'
echo % commit branch
cd src
cvs -q update -r1.1 b/c
cvs -q tag -b branch
cvs -q update -r branch > /dev/null
echo d >> b/c
cvs -q commit -mci2 . | grep '<--' |\
sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
cd ..
echo % convert again
hg convert src src-hg | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
hgcat b/c
echo % convert again with --filemap
hg convert --filemap filemap src src-filemap | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
hgcat b/c
hg -R src-filemap log --template '{rev} {desc} files: {files}\n'
echo % commit a new revision with funny log message
cd src
sleep 1
echo e >> a
cvscall -q commit -m'funny
----------------------------
log message' . | grep '<--' |\
sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
cd ..
echo % convert again
hg convert src src-hg | sed -e 's/connecting to.*cvsrepo/connecting to cvsrepo/g'
echo "graphlog = " >> $HGRCPATH
hg -R src-hg glog --template '{rev} ({branches}) {desc} files: {files}\n'
echo % testing debugcvsps
cd src
hg debugcvsps | sed -e 's/Author:.*/Author:/' -e 's/Date:.*/Date:/'