Checkout a specific dev version of module using git I want to checkout a specific dev version of the feeds module using git.  I have a site which is using feeds 7.x-2.x-dev.  On the modules admin page the module version number is reported as 7.x-2.0-alpha8+99-dev. 

I have cloned the feeds module repo but can't work out how to checkout that specific version.  I tried using git checkout 7.x-2.0-alpha8+99-dev, but it didn't work.  I guess if I knew the commit number I could check it out, but not sure how to easily work this out other than manually reviewing the commit log and working out what was the 99th commit after alpha8.  I am hoping there might be an easier way.

Would appreciate any suggestions.
This is more a git question than Drupal, but you can use rev-list command to retrieve a list of commit hashes since the 7.x-2.0-alpha8 tag. Using the tail command you can reverse the list to show the first 100 commits (I think the +XX- scheme is an offset from the first commit) then filter that down to the last result (which should be +99-dev commit).

git rev-list 7.x-2.0-alpha8^..HEAD  | tail -r -n 100 | tail -n -1