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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.
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test-backout.out
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# should complain
abort: please specify a revision to backout
abort: please specify just one revision
# basic operation
adding a
reverting a
changeset 2:2929462c3dff backs out changeset 1:a820f4f40a57
a
# file that was removed is recreated
adding a
adding a
changeset 2:de31bdc76c0d backs out changeset 1:76862dcce372
content
# backout of backout is as if nothing happened
removing a
changeset 3:7f6d0f120113 backs out changeset 2:de31bdc76c0d
cat: a: No such file or directory
# across branch
adding a
adding b
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
abort: cannot backout change on a different branch
adding c
created new head
abort: cannot backout change on a different branch
# backout with merge
adding a
reverting a
created new head
changeset 3:26b8ccb9ad91 backs out changeset 1:5a50a024c182
merging with changeset 3:26b8ccb9ad91
merging a
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
line 1
line 2
line 3
# backout should not back out subsequent changesets
adding a
adding b
reverting a
created new head
changeset 3:3202beb76721 backs out changeset 1:22bca4c721e5
the backout changeset is a new head - do not forget to merge
(use "backout --merge" if you want to auto-merge)
b
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding a
adding b
adding c
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding d
created new head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# backout of merge should fail
abort: cannot backout a merge changeset without --parent
# backout of merge with bad parent should fail
abort: cb9a9f314b8b is not a parent of b2f3bb92043e
# backout of non-merge with parent should fail
abort: cannot use --parent on non-merge changeset
# backout with valid parent should be ok
removing d
changeset 5:10e5328c8435 backs out changeset 4:b2f3bb92043e
rolling back last transaction
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing c
changeset 5:033590168430 backs out changeset 4:b2f3bb92043e
# named branches
adding default
marked working directory as branch branch1
adding file1
marked working directory as branch branch2
adding file2
removing file1
created new head
changeset 3:d4e8f6db59fb backs out changeset 1:bf1602f437f3
the backout changeset is a new head - do not forget to merge
(use "backout --merge" if you want to auto-merge)
% on branch2 with branch1 not merged, so file1 should still exist:
45bbcd363bf0 (branch2)
C default
C file1
C file2
% on branch2 with branch1 merged, so file1 should be gone:
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
22149cdde76d (branch2) tip
C default
C file2
% on branch1, so no file1 and file2:
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
bf1602f437f3 (branch1)
C default
C file1