Mercurial revert/backout a single file

Question

In Mercurial I have an old changeset which is all good apart from the alterations to a single file. How would I revert the alterations to that single file?

Even just being able to view the state of the file at the previous changeset would be good then I could cut & paste.

My Mercurial client is TortoiseHg.

Answer 1

As of TortoiseHg 2.8.1

1. Commit in case something goes wrong
2. Right click the revision you want to roll back to, select Browse At Revision
3. Find the file you want to revert to this revision, right click, 'Revert to this revision (Ctrl+Shift+R)
4. Repeat 3 for all files you want to revert

Answer 2

Raghuram's answer is no longer correct due to stylistic(~) changes to TortoiseHG. "Repository Browser" has been renamed "TortoiseHG Workbench", but, more importantly, "Revert file contents" is no longer an action on the context menu.

As of version 2.0.4, you'll want to:

1. Commit your current repository in case something goes wrong.
2. Open the relevant changeset in "TortoiseHG Explorer"
3. In the file listing, right-click on the file you which to revert.
4. Select "Revert to Revision" from the context menu.
5. You'll be presented with a confirmation dialog that contains a checkbox labeled "Revert all files to this revision". Make sure that it's unchecked.
6. Hit "OK".
7. Verify that only that file was reverted. If everything was reverted, update to the revision created in step 1.

The first time I tried this, I'm not sure what I did wrong, but I reverted the whole repository instead of the single file. So, definitely make sure you commit a new revision before trying it.