>I'm trying to understand how it works and I'll appreciate if someone could >help.
>1. git uses object abstraction for the different types and so >everything is in one directory (objects). From what I've seen in the >implementation, the different kind of objects are not of the same type >(there aren't any operations which work on two different types) and >thus in each step when an object is used its type is verified. >What's the benefit of having them all in the same tree? An alternative >would be to separate the different object types into different >directories which trivially allows getting a list of all commits, or >trees or blobs. If all the commits were in ".git/objects/commits/xx/xxxxx", etc. then every time git opened a file the kernel would have one extra level of directory to walk to get to the file ... so opens would be fractionally slower. There is no normal-use upside to this overhead. While it would be easier to find all the blobs if they were kept separate from the trees and commits, there isn't any time that we'd ever want to scan through just the blobs. Git never goes searching through a directory opening files to see what they are (exception: fsck-cache does scan all objects). >2. A commit can have more than one parent. Can anyone draw an example >of such a case? When do we get a commit graph which is not linear? When a merge happens. E.g. I take a snapshot of Linus' tree when a file is at version 1.2. We both make a couple of changes before I ask him to pull from my tree: 1.1 -> 1.2 -> 1.3 -> 1.4 -> 1.5 \ / 1.2.1 -> 1.2.2 ---/ The changeset to create 1.5 has two parents ... the changeset that Linus made to create 1.4, and the changeset that I made to create 1.2.2 >3. How does git handle binary files? I guess it doesn't really care if >it's binary or text, but how would the diff and merge scripts handle >them? Yes, git doesn't care. Diff is somewhat smart about noticing that its input files aren't text: $ diff /bin/cat /bin/ls Binary files /bin/cat and /bin/ls differ But in general this will be an issue for the SCM layer if there are binary files checked into the tree. -Tony - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html