Subversion: howto find all revisions that are not merged to trunk?

Question

Branching sources for release cycle is one of common source management scenarios. Merging as soon as possible is a good practice. Thus we have a human factor: branch is closed, but someone forgot to merge something back to trunk.

Q: Is there a "one click" way to get all revision numbers that were not merged from branch X to trunk?

(Note: I do not need these revision numbers to find what to merge, I need them to create automated validation, that would remind people to make sure they did not forget to merge something to trunk. Merging itself is not an issue.)

It seems like svn mergeinfo command fails to help here. Passing branch and trunk roots will fail if merge was performed not on root level (and it is a common scenario).

Scripts, tools any kind of svn hooks as a solution are welcome.

P.S.

Latest version of SVN. No need to argue how common or good this scenario is ;)

Answer 1

You can do this super easily if you're using a relatively newish version of Subversion (1.5 or higher, I think) with the mergeinfo sub-command.

svn mergeinfo --show-revs eligible svn://repo/branches/your-branch-name svn://repo/trunk 

This will show you all the revisions that are eligible to be merged to the trunk from the branch "your-branch-name".

Source: http://svnbook.red-bean.com/en/1.5/svn.ref.svn.c.mergeinfo.html

Answer 2

Short answer: I don't think so.

Long answer: I ended up writing a python script to answer this question. Whenever developers merge a changeset they're required to put "merged rXXX" in the log message. (This from before svn:mergeinfo existed) The script parses all live svn branches + trunk and recursively scans all "merged" links, outputting a per-developer list of changes they haven't merged.

[update] The answer from @tmont is better now that everyone has a svn version that supports svn mergeinfo --show-revs eligible and svn merge --record-only for those times when you want to record the logical fix only.