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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.
Will Maier - - Load All Authors

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r8721:2816239e default
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test-fncache
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Adrian Buehlmann
add test-fncache
 r7290 #!/bin/sh
echo "% init repo1"
hg init repo1
cd repo1
echo
echo "% add a; ci"
echo "some text" > a
hg add
Martin Geisler
tests: removed redundant "-d '0 0'" from test scripts...
 r8167 hg ci -m first
Adrian Buehlmann
add test-fncache
 r7290
echo
echo "% cat .hg/store/fncache"
cat .hg/store/fncache
echo
echo "% add a.i/b; ci"
mkdir a.i
echo "some other text" > a.i/b
hg add
Martin Geisler
tests: removed redundant "-d '0 0'" from test scripts...
 r8167 hg ci -m second
Adrian Buehlmann
add test-fncache
 r7290
echo
echo "% cat .hg/store/fncache"
cat .hg/store/fncache
echo
echo "% add a.i.hg/c; ci"
mkdir a.i.hg
echo "yet another text" > a.i.hg/c
hg add
Martin Geisler
tests: removed redundant "-d '0 0'" from test scripts...
 r8167 hg ci -m third
Adrian Buehlmann
add test-fncache
 r7290
echo
echo "% cat .hg/store/fncache"
cat .hg/store/fncache
echo
echo "% hg verify"
hg verify
echo
echo "% rm .hg/store/fncache"
rm .hg/store/fncache
echo
echo "% hg verify"
hg verify
Benoit Boissinot
store encoding: .i/.d encoding for non-store repo (broken by 810387f59696)
 r8633 # try non store repo encoding
cd ..
echo % non store repo
hg --config format.usestore=False init foo
cd foo
mkdir tst.d
echo foo > tst.d/foo
hg ci -Amfoo
Will Maier
test-fncache: Use find instead of ls -R....
 r8721 find .hg | sort
Benoit Boissinot
store encoding: .i/.d encoding for non-store repo (broken by 810387f59696)
 r8633
cd ..
echo % non fncache repo
hg --config format.usefncache=False init bar
cd bar
mkdir tst.d
echo foo > tst.d/Foo
hg ci -Amfoo
Will Maier
test-fncache: Use find instead of ls -R....
 r8721 find .hg | sort
Benoit Boissinot
store encoding: .i/.d encoding for non-store repo (broken by 810387f59696)
 r8633
Adrian Buehlmann
add test-fncache
 r7290 exit 0