Is it possible to undo an import in subversion?

By accident I called "svn import ..." in the wrong directory. Is there a sensible way to undo this mistake?

Googling I didn't find any useful answer, and the closest to my problem I found on stackoverflow was importing the correct data to the wrong place, whereas I imported the wrong data to the correct place.

And: the repository is NOT new, so deleting it is out of question.

It would be a kind of ironic, if I couldn't undo operations in a version control system. So can someone help me? (Thanks!)

EDIT: I got my repository stored in a Berkley Database, i.e., it's in the file system. Looking at the modification date of all files/directories and at the content of the just modified开发者_开发技巧 files I was able to work out what to do except for one thing: does anybody know what's the file txn-current is for? I guess it's connected to the transaction handling, but what's the meaning of its content (length is 2 bytes)?

EDIT 2: Thanks for both helpful answers. I accepted Martin's answer as it should provide the proper way of doing it (as I'm under time pressure I just deleted some files as hinted in my first EDIT ignoring the content of txn-current and live fine with until now). But check out the link Wim gave in his comment!

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You can't undo a commit directly, the only option for this is to do an svnadmin dump, remove the commit from the dumpfile (either by hand using a text editor, or using svndumpfilter, and svnadmin load it again.

If it's not a real problem that the data stays somewhere in the repository as an older revision, you can just svn delete it and commit something else instead.

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If there were no other commits since you imported your files, then you can easily delete the last revision using svn dump.

The following example is taken from this page:

• (assuming revisions 1-125 are OK, 126 is that last revision, causing the problem)
• make a backup of the repository, then dump the repository (except the last revision):
  • > svnadmin dump -r1:125 myrepo > my.dump
• now create a new repository and load the dump:
  • > svnadmin create myrepo
  • > svnadmin load myrepo < my.dump