[MacPorts] WorkingWithGitSVN modified

[MacPorts]

Page "WorkingWithGitSVN" was changed by cal at macports.org
Diff URL: <https://trac.macports.org/wiki/WorkingWithGitSVN?action=diff&version=9>
Revision 9
Comment: += git-filter-branch(1)
Changes:
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Index: WorkingWithGitSVN
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--- WorkingWithGitSVN (version: 8)
+++ WorkingWithGitSVN (version: 9)
@@ -106,3 +106,9 @@
 With the current git mirror everyone interested in base is also required to fetch the trees for dports/, doc/ and doc-new/, and www/. Also, all branches for base are missing.
 
 For disk space and usability reasons, a separate repository might be easier to handle, especially when you can just add that to sources.conf. Note we already have contrib/ and users/ as separate repositories.
+
+Given your Git repository, you can use `git filter-branch(1)` to remove all history but that in a subdirectory. Note that you should do this on a copy of your repository. For example, to split www from the rest of the repository, use
+
+{{{
+git filter-branch --subdirectory-filter www --prune-empty -- --all
+}}}
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