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Sequential Revision Numbers in Git
Sun April 19th, 2009 at 8:11 AM PDT
I've been using Git for a while now on some of my projects, and find it utterly fantastic. It's faster than any SCM I've ever seen, and makes branches a snap. BAM!

But one thing has always annoyed me about it (well, other than being forced to lug the whole repo around when lots of times that isn't necessary):

Revision numbers are a nasty 40-byte hex string.

What good is that? I'm sure it's ultra-useful to the computer, but it tells me absolutely nothing about the given commit. I like Subversion's method, where commits start from 1 and go upward sequentially.

Well, today I figured out how to convert Git's 40-byte hashes into useful revision numbers. I actually figured this out for the benefit of the integrated SCM viewer and issue tracker software I've been working on, but have come to use it a lot outside of there.

Here's a handy shell script to convert Git SHA1 object names into sequential commit numbers:

git rev-list --reverse HEAD | grep -n $rev | cut -d: -f1

where $rev is the Git commit hash. Of course, you must be in your Git working directory for the command to work.

In my extremely informal experiments, the number printed by that command seems to be consistent across multiple distributed copies of the same repository, but merges may affect it. I don't know. But if you have a central repository, the number will never change for a given commit, and that's all that's really important.

Hope this helps someone!

_WRF

Edit:
Here's a nice addition to your .bashrc:

function git-rev-number()
{
    if [[ $1 == "" ]]; then
        echo "usage: git-rev-number "
        return 1
    fi
    number=`git rev-list --reverse HEAD | grep -n $1 | cut -d: -f1`
    if [[ $number == "" ]]; then
        echo "commit not found"
        return 1
    else
        echo $number
    fi
    return 0
}
» (1 comment) (make a comment)


Last 1 comments:

dru Thu September 17th, 2009 at 5:15 AM PDT No.443 (reply)
Nice idea, thank you :)

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