problem when pulling a specific branch from origin

[Ivan Kanis <expire-by-2011-02-06@kanis.fr>]

Hello,

When I pull a specific branch from a repository I get in a state where
git thinks I am ahead of the branch by one commit. The use case is a
programmer that doesn't want to pull all the branches of the server.

I have made a small script to reproduce the problem:

----
#!/bin/sh

rm -rf foo bar
git --version
mkdir foo
cd foo
git init
echo foo > foo.txt
git add foo.txt
git commit -am"foo"
git checkout -b branch
cd ..
git clone foo bar
cd foo
echo bar > foo.txt
git commit -am"bar"
cd ..
cd bar
git pull origin branch
git status
git branch -rv
----

I get the following output:

----
git version 1.7.3.5
Initialized empty Git repository in /home/ivan/tmp/foo/.git/
[master (root-commit) eefa065] foo
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 foo.txt
Switched to a new branch 'branch'
Cloning into bar...
done.
[branch 7ecd065] bar
 1 files changed, 1 insertions(+), 1 deletions(-)
remote: Counting objects: 5, done.
remote: Total 3 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
From /home/ivan/tmp/foo
 * branch            branch     -> FETCH_HEAD
Updating eefa065..7ecd065
Fast-forward
 foo.txt |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
nothing to commit (working directory clean)
  origin/HEAD   -> origin/master
  origin/branch eefa065 foo
  origin/master eefa065 foo
----

I expected to not be ahead of origin/master and that origin/branch
points to 7ecd065. Is this a bug? 

Take care,
-- 
Ivan Kanis

Sure, ninety percent of science fiction is crud. That's because ninety
percent of everything is crud.
    -- Theodore Sturgeon