An example of howto use git2go (https://github.com/libgit2/git2go) which is a libgit2 (https://libgit2.github.com/) bindings package for golang.

git-unsorted-log.go

/*
requires libgit2
*/


package main

import (
    "github.com/libgit2/git2go"
    "fmt"
    "log"
    "flag"
    "strings"
)


type Blob struct {
    *git.Blob
    id *git.Oid
}

func main(){

    repoPath := flag.String("repo", "~/git/testrepo", "path to the git repository")
    flag.Parse()

    repo, err := git.OpenRepository(*repoPath)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(repo)

    odb, err := repo.Odb()
    if err != nil {
        log.Fatal(err)
    }

    err = odb.ForEach(func(oid *git.Oid) error {
        obj, err := repo.Lookup(oid)
        if err != nil {
            return err
        }

        switch obj := obj.(type) {
        default:
        case *git.Blob:
            break
            fmt.Printf("==================================\n")
            fmt.Printf("obj:  %s\n", obj)
            fmt.Printf("Type: %s\n", obj.Type())
            fmt.Printf("Id:   %s\n", obj.Id())
            fmt.Printf("Size: %s\n", obj.Size())
        case *git.Commit:
            fmt.Printf("==================================\n")
            fmt.Printf("obj:  %s\n", obj)
            fmt.Printf("Type: %s\n", obj.Type())
            fmt.Printf("Id:   %s\n", obj.Id())
            author := obj.Author()
            fmt.Printf("    Author:\n        Name:  %s\n        Email: %s\n        Date:  %s\n", author.Name, author.Email, author.When)
            committer := obj.Committer()
            fmt.Printf("    Committer:\n        Name:  %s\n        Email: %s\n        Date:  %s\n", committer.Name, committer.Email, committer.When)
            fmt.Printf("    ParentCount: %s\n", int(obj.ParentCount()))
            fmt.Printf("    TreeId:      %s\n", obj.TreeId())
            fmt.Printf("    Message:\n\n        %s\n\n", strings.Replace(obj.Message(),"\n","\n        ", -1))
            //fmt.Printf("obj.Parent: %s\n", obj.Parent())
            //fmt.Printf("obj.ParentId: %s\n", obj.ParentId())
            //fmt.Printf("obj.Tree: %s\n", obj.Tree())
        case *git.Tree:
            break
            fmt.Printf("==================================\n")
            fmt.Printf("obj:  %s\n", obj)
            fmt.Printf("Type: %s\n", obj.Type())
            fmt.Printf("Id:   %s\n", obj.Id())
            fmt.Printf("    EntryCount: %s\n", obj.EntryCount())
        }
        return nil
    })

    if err != nil {
        log.Fatal("Lookup:", err)
    }
}