[MERGE] mv accepts paths containing symlinks #66964

[Aaron Bentley]

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Hi all,

Currentley, bzr commands that accept filenames don't traverse symlinks.

So if you have

foo/bar (directory)
baz (symlink -> foo)

you cannot specify "bzr mv baz/mar", even though you can with normal
UNIX mv.  Futhermore, the crash is really ugly.  This bundle

1. changes path2id so that it returns None if you specify a path that
contains a non-directory as a parent directory, because path2id returns
None if the path doesn't exist.

2. runs osutils.realpath on all input paths, in such a way that paths
*to* symlinks are not adjusted, but paths *through* symlinks are adjusted.

This only works for the current working tree, not for RevisionTrees,
etc.  Attempting to solve all of them at once proved very difficult, so
I think this is the best solution for now, and a considerable
improvement over what we had.

Aaron
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