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Use two allocators for marks, one persistent commit counter that starts at 0
and counts up commits, and a transitional counter, for files, that counts down
from maxMark, and is reset on each SVN revision.
Note that the marks file will still have marks for some, but not all, files.
The number of such marks is limited by the size of the SVN revision that affects
the most files.
For instance, this changed the size of one marks file from 19M to 3.2M.
fast-import issues: We currently set maxMark = (1<<20)-1. Anything large seems
to trigger a bug in the sparse array dumping routine in git-fast-import in
certain versions of git.
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We use the progress logs that we carefully maintained to recreate the
branch data structures, as described in earlier commits.
A major change/improvement is that reloadBranches() now uses the marks file
and internal data structures to prime the fast-import rather than using
git-rev-parse.
We also handle --resume-from properly, by truncating the log file to revisions
that only precede the revision resumed from. Note that git fast-import allows
marks to be reused without any extra processing.
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SVN directory deletes often indicate one or more branch deletions. However,
since the deleted directory isn't present in the resulting revision, several
of the indicators used by the rule-application mechanism aren't present.
This forces us to introduce several useless dummy rules to avoid errors.
We now note deletions and use the previous revision to determine several
properties, including whether the deleted item is a directory or not, and to
enumerate the contents of the directory in recurse mode.
We add an additional heuristic for unknown repositories -- i.e., when a rule
fired, but it's repository was invalid. We recurse in this case hoping to
catch a more specific rule. I believe this is safe: because some other rule
must've seen the same directory before, when it or a subdirectory was created,
and decided _not_ to create a repository at that point -- so recursing and/or
ignoring the contents of the just deleted directory won't corrupt the history,
it can only improve it.
We use mark :0 to note mark deletions internally, and in the progress logs.
(Note that cvs2svn creates wierd commits where a whole tree is copied first,
and then subtrees are pruned. In such cases, neither the previous revision
nor the current revision have the deleted directory -- we ignore this case
as before. There's no information loss since the final contents of the revision
are exactly what is desired.)
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A single SVN revision can affect multiple branches in the same repository.
Keeping track of only one mark per revision loses information and makes
the history incorrect.
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We use a literal meaning of multiple commit parents to allow us to infer
some partial repository copying as merges. This helps us
1) track history despite some directory reorganization
2) link subset commits to parents
3) infer some merges which were achieved by overwriting
a subtree with contents from another branch
This seems to work well enough even with cvs2svn monster commits. The
heuristics have been tuned by gut feel to work reasonably well with mono's
SVN repository. They can definitely be improved.
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Previously, all the SVN commits were tracked in a linear array, and we searched
for nearest commits in that array. However, SVN history is not linear, and the
'next smallest commit' search was picking the wrong commit.
I've moved the commit array into the 'Branch' structure.
As a minor subtlety, the branch creation revision is also noted in the
'commitMarks' structure, by copying the commit mark of the branch point.
We need this to ensure that the commits array is strictly non-decreasing.
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The GPLv2 is incompatible with the Apache 2.0 License used in the SVN libs.
So everyone was using this software under the GPLv3 anyway. Formalise it now.
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SVN revision
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I don't know what went wrong, but importing KDE revision 296047 there was a mixup with the marks. So instead avoid the trouble and store the thing in in cooked format already
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