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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.
Martin Geisler - - Load All Authors

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test-qrecord.out
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% help (no mq, so no qrecord)
hg: unknown command 'qrecord'
Mercurial Distributed SCM
basic commands:
add add the specified files on the next commit
annotate show changeset information by line for each file
clone make a copy of an existing repository
commit commit the specified files or all outstanding changes
diff diff repository (or selected files)
export dump the header and diffs for one or more changesets
forget forget the specified files on the next commit
init create a new repository in the given directory
log show revision history of entire repository or files
merge merge working directory with another revision
parents show the parents of the working directory or revision
pull pull changes from the specified source
push push changes to the specified destination
remove remove the specified files on the next commit
serve export the repository via HTTP
status show changed files in the working directory
update update working directory
use "hg help" for the full list of commands or "hg -v" for details
% help (mq present)
hg qrecord [OPTION]... PATCH [FILE]...
interactively record a new patch
See 'hg help qnew' & 'hg help record' for more information and usage.
options:
-e --edit edit commit message
-g --git use git extended diff format
-U --currentuser add "From: <current user>" to patch
-u --user add "From: <given user>" to patch
-D --currentdate add "Date: <current date>" to patch
-d --date add "Date: <given date>" to patch
-I --include include names matching the given patterns
-X --exclude exclude names matching the given patterns
-m --message use <text> as commit message
-l --logfile read commit message from <file>
use "hg -v help qrecord" to show global options
% base commit
% changing files
% whole diff
diff -r 1057167b20ef 1.txt
--- a/1.txt
+++ b/1.txt
@@ -1,5 +1,5 @@
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diff -r 1057167b20ef 2.txt
--- a/2.txt
+++ b/2.txt
@@ -1,5 +1,5 @@
a
-b
+b b
c
d
e
diff -r 1057167b20ef dir/a.txt
--- a/dir/a.txt
+++ b/dir/a.txt
@@ -1,4 +1,4 @@
-hello world
+hello world!
someone
up
% qrecord a.patch
diff --git a/1.txt b/1.txt
2 hunks, 4 lines changed
examine changes to '1.txt'? [Ynsfdaq?] @@ -1,3 +1,3 @@
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-2
+2 2
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record change 1/6 to '1.txt'? [Ynsfdaq?] @@ -3,3 +3,3 @@
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+4 4
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record change 2/6 to '1.txt'? [Ynsfdaq?] diff --git a/2.txt b/2.txt
1 hunks, 2 lines changed
examine changes to '2.txt'? [Ynsfdaq?] @@ -1,5 +1,5 @@
a
-b
+b b
c
d
e
record change 4/6 to '2.txt'? [Ynsfdaq?] diff --git a/dir/a.txt b/dir/a.txt
1 hunks, 2 lines changed
examine changes to 'dir/a.txt'? [Ynsfdaq?]
% after qrecord a.patch 'tip'
changeset: 1:5d1ca63427ee
tag: qtip
tag: tip
tag: a.patch
tag: qbase
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: aaa
diff -r 1057167b20ef -r 5d1ca63427ee 1.txt
--- a/1.txt Thu Jan 01 00:00:00 1970 +0000
+++ b/1.txt Thu Jan 01 00:00:00 1970 +0000
@@ -1,5 +1,5 @@
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+2 2
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diff -r 1057167b20ef -r 5d1ca63427ee 2.txt
--- a/2.txt Thu Jan 01 00:00:00 1970 +0000
+++ b/2.txt Thu Jan 01 00:00:00 1970 +0000
@@ -1,5 +1,5 @@
a
-b
+b b
c
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e
% after qrecord a.patch 'diff'
diff -r 5d1ca63427ee 1.txt
--- a/1.txt
+++ b/1.txt
@@ -1,5 +1,5 @@
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-4
+4 4
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diff -r 5d1ca63427ee dir/a.txt
--- a/dir/a.txt
+++ b/dir/a.txt
@@ -1,4 +1,4 @@
-hello world
+hello world!
someone
up
% qrecord b.patch
diff --git a/1.txt b/1.txt
1 hunks, 2 lines changed
examine changes to '1.txt'? [Ynsfdaq?] @@ -1,5 +1,5 @@
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2 2
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-4
+4 4
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record change 1/3 to '1.txt'? [Ynsfdaq?] diff --git a/dir/a.txt b/dir/a.txt
1 hunks, 2 lines changed
examine changes to 'dir/a.txt'? [Ynsfdaq?] @@ -1,4 +1,4 @@
-hello world
+hello world!
someone
up
record change 3/3 to 'dir/a.txt'? [Ynsfdaq?]
% after qrecord b.patch 'tip'
changeset: 2:b056198bf878
tag: qtip
tag: tip
tag: b.patch
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: bbb
diff -r 5d1ca63427ee -r b056198bf878 1.txt
--- a/1.txt Thu Jan 01 00:00:00 1970 +0000
+++ b/1.txt Thu Jan 01 00:00:00 1970 +0000
@@ -1,5 +1,5 @@
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2 2
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-4
+4 4
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diff -r 5d1ca63427ee -r b056198bf878 dir/a.txt
--- a/dir/a.txt Thu Jan 01 00:00:00 1970 +0000
+++ b/dir/a.txt Thu Jan 01 00:00:00 1970 +0000
@@ -1,4 +1,4 @@
-hello world
+hello world!
someone
up
% after qrecord b.patch 'diff'
% --- end ---