lstat_cache(): print a warning if doing ping-pong between cache types

diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index b0e710d5f9c05eb86ce3ccc4e1aa4a7868f3abff..451950bab67702a236c55e77d6f3a0723a812488 100644 (file)
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -36,7 +36,9 @@ the objects and will not converge with the original branch.  You will not
 be able to easily push and distribute the rewritten branch on top of the
 original branch.  Please do not use this command if you do not know the
 full implications, and avoid using it anyway, if a simple single commit
-would suffice to fix your problem.
+would suffice to fix your problem.  (See the "RECOVERING FROM UPSTREAM
+REBASE" section in linkgit:git-rebase[1] for further information about
+rewriting published history.)
 
 Always verify that the rewritten version is correct: The original refs,
 if different from the rewritten ones, will be stored in the namespace
@@ -120,6 +122,10 @@ You can use the 'map' convenience function in this filter, and other
 convenience functions, too.  For example, calling 'skip_commit "$@"'
 will leave out the current commit (but not its changes! If you want
 that, use 'git-rebase' instead).
++
+You can also use the 'git_commit_non_empty_tree "$@"' instead of
+'git commit-tree "$@"' if you don't wish to keep commits with a single parent
+and that makes no change to the tree.
 
 --tag-name-filter <command>::
        This is the filter for rewriting tag names. When passed,
@@ -149,6 +155,16 @@ to other tags will be rewritten to point to the underlying commit.
        The result will contain that directory (and only that) as its
        project root.
 
+--prune-empty::
+       Some kind of filters will generate empty commits, that left the tree
+       untouched.  This switch allow git-filter-branch to ignore such
+       commits.  Though, this switch only applies for commits that have one
+       and only one parent, it will hence keep merges points. Also, this
+       option is not compatible with the use of '--commit-filter'. Though you
+       just need to use the function 'git_commit_non_empty_tree "$@"' instead
+       of the 'git commit-tree "$@"' idiom in your commit filter to make that
+       happen.
+
 --original <namespace>::
        Use this option to set the namespace where the original commits
        will be stored. The default value is 'refs/original'.