Half-assed commits

During my work on the Coordinated Wesnoth User-Made Content Development Project (which we dub "wesnoth-umc-dev" for short), I came up with an interesting concept related to Subversion's standard workflow. Half-assed commits are revision commits to the Subversion repository that are not completed due to the subversion client (or server!) process dying unexpectedly, usually due to anything but a SIGTERM.

The obvious symptom of a half-assed commit in your local file system is a bunch of 'L' flags in the svn st command output. These can be removed with svn cleanup. So, most half-assed commits are harmless to you. However, according to the (holy) Subversion Book, it may leave garbage, half-assed transactions in the repository. These are not viewable to anyone but the repository admin of course, and should not harm anyone provided the filesystem on which it resides does not run out of space.

😐 Last afternoon I ran into a more harmful and painful sort of half-assed commit. I renamed some files in my working copy, invoked svn ci, and my crappy Wireless LAN connection burped just when it was about to update the working copy with the changes introduced to the repository:

Transmitting file data ...svn: Commit failed (details follow):
svn: MERGE request failed on '/svnroot/wesnoth-umc-dev/trunk/Invasion_from_the_Unknown'
svn: MERGE of '/svnroot/wesnoth-umc-dev/trunk/Invasion_from_the_Unknown': Could not read status line: Connection reset by peer
(https://wesnoth-umc-dev.svn.sourceforge.net)
svn: Your commit message was left in a temporary file:
svn:    '/home/shadowm/src/wesnoth-umc-dev/trunk/Invasion_from_the_Unknown/svn-commit.2.tmp'

Unsurprisingly, I was left with my files in an awful state that caused local conflicts with the repository. That is, next svn update failed because the commit above was successful for the server, leaving the renamed files in the repository. SVN just didn't like that at my end, because I had those renamed files already in the working copy as result of the svn move result I just (half-ass) commited.

Thanks for nothing SVN! Seriously, the protocol should have the server request for a final confirmation from the client to check-in the transaction after its changes have been merged in the client's working copy. Or the inverse: have the client react in a smarter fashion to these situations that people like me often run into.