When does git check for branch-X being uptodate with origin/branch-X?

Hi all,

Something I've seen a few times of late (although I doubt that's any indication that the code has changed in Git) is the reporting of branch-X being uptodate with origin/branch-X when it isn't.

When does git check to see if branch-X has a remote tracking branch and that it has changes on it? Only, the output below is misleading:

% git checkout master Switched to branch 'master' Your branch is up-to-date with 'fvwmorg/master'.

[fvwm-cvs-to-git/docs]{10345}[0][master] % git pull
remote: Counting objects: 26, done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 26 (delta 18), reused 22 (delta 14), pack-reused 0
Unpacking objects: 100% (26/26), done.
From github.com:fvwmorg/fvwm
   c029868..36cc898  master     -> fvwmorg/master
   4f0c7ec..36cc898  ta/git-docs -> fvwmorg/ta/git-docs
Updating c029868..36cc898
Fast-forward
[...]

Clearly, it's obvious that "Your branch is up-to-date with 'fvwmorg/master'." is misleading. Note that in this case, there's no passwords or other hindrances to Git being able to work out that a branch is behind another.

Any light that can be shed on this, is much appreciated!

Kindly, Thomas Adam