由于 SVN 存储库中的复杂结构，某些外部文件无法从存储库中正确检索。由于更改存储库结构不是一种选择，我开发了一个脚本，它遍历外部并在需要时“手动”检索它们（感谢“svn export”）。为了检测是否确实需要这个操作，我执行'svn info'，假设如果文件不存在，或者它没有版本控制，它将返回不同于0。这确实是在 host1 (SVN Client 1.6.17) 中获得的行为：
# Initially, the directory is empty
host1$ ls
host1$ svn update
Fetching external item into 'main.rbf'
svn: warning: '<REMOTE_SVN_LOCATION1>'
is not the same repository as
'<REMOTE_SVN_LOCATION2>'
At revision 18413.
# Although we do the update, the external item is not fetched,
# as it is a single file coming from a different repository
# (known problem)
host1$ ls
# The file is not present, and SVN info acts accordingly
host1$ svn info main.rbf
main.rbf: (Not a versioned resource)
svn: A problem occurred; see other errors for details
# If we force the SVN export
host1$ svn export <REMOTE_SVN_LOCATION1> main.rbf
A main.rbf
Export complete.
host1$ ls
main.rbf
# then SVN info detects it and acts accordingly
host1$ svn info main.rbf
main.rbf: (Not a versioned resource)
svn: A problem occurred; see other errors for details
host1$
在 host2（SVN Client 1.6.11）中，“SVN info”的行为完全不同：无论文件是否存在（来自以前的导出），答案是：
# Directory is empty
host2$ ls
host2$ svn info main.rbf
Path: .
URL: <REMOTE_LOCATION>
Repository Root: ...
Repository UUID: ...
Revision: 18413
Node Kind: directory
Schedule: normal
Last Changed Author: ...
Last Changed Rev: 18326
Last Changed Date: ...
host2$
有什么理由来解释这种不一致的行为吗？如何在 host2 中检测到这个未版本控制的文件？