Undoing an svn commit

Sometimes one may inadvertently commit a change that was not intended or need to revert a change made by someone else because it breaks functionality. For example:

$ svn ci test_vls.c
... revision: 9999

We want to "uncommit" the change. First get the URL of the trunk (shortened example):

$ svn info
Path: .
URL: https://brlcad/svnroot/trunk
Repository Root: https://brlcad/svnroot
Repository UUID: 2f96ce8b-6d43-0410-b8df-bffccc660ffb
Revision: 9999
Node Kind: directory
Schedule: normal
Last Changed Author: tom
Last Changed Rev: 9999
Last Changed Date: 2012-05-23 15:10:33 -0500 (Wed, 23 May 2012)

If we don't want to lose the changes we just committed, no worries. We can copy those file(s) to an unversioned directory before we do the merge steps below or extract those changes at any point in the future with the "svn diff" command. Stash the changed file(s) if desired.

Do the merge:

$ svn svn merge -r9999:9998 https://brlcad/svnroot/trunk
U  test_vls.c

That just "merged" the commits from revision 9999 to 9998, which effectively "undoes" 9999. Check that your trunk checkout has changed back to the state before the bad commit:

$ svn diff

Save the diffs if desired.

Commit the change (caution: this will undo local changes that were originally committed!):

$ svn commit -m "Reverting r9999 because ..."
Sending        test_vls.c
Transmitting file data .
Committed revision 10000.