Re: Submodule commits not show by git log

> Hi all,
> 
> I'm trying to track changes on a git submodule. `$ git log
> path/to/submodule` is not showing any commits that changed the
> submodule commit.
> 
> For example, in my repo I have a submodule at the path
> ./memcache_utils that has had the commit referenced changed several
> times. It's definitely a submodule:
> 
> $ git submodule
> 
> 13eb087304b995705693d6f0927dec2d88dfadaf datastore_utils
> (heads/master-2-g13eb087)
>  7f5d6710b767a27f14e3e7bc009f026b3e5f0e74 memcache_utils (heads/master)
>  5877e2c2d82645fa44f121884291ee48cf24584d potatobase (5877e2c)
> 
> Yet the only commit shown is when there were files at that path:
> 
> $ git log memcache_utils
> commit 2cbe65bf31901873b01331e95fec72724e7458eb
> Author: [...]
> Date:   Thu Jan 26 20:44:07 2012 +0000
> 
>     Experimenting with Paul G's port of cache-machine. It should
> really be a git submodule but just want to see how it works so have
> taken a copy from [...]
> $
> 
> Have I missed something? I've tried and failed to create a minimal
> test case that demonstrates this behaviour. I can't see anything in
> the man pages to suggest that I'm using git log incorrectly, and
> Googling doesn't help.
> 
> Is this user error, a known bug, or a new one?