Posted Jul 10, 2008 12:17 UTC (Thu) by nix (subscriber, #2304)
[Link]
It's just a unique identifier. All the git commands accept these (as well
as tags, branch names and a huge bunch of other ways of identifying
commits, trees, and so on, see 'Specifying Revisions' in the
git-rev-parse(1) manpage).
Try 'git show b7279469d66b55119784b8b9529c99c1955fe747' to see what it is.