The Big Book of Blob Trees (Blobs)

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By using --stdin we are instructing git hash-object to take its input from the standard input. This will provide us with the relevant hash value.

Counselling example using BLOB TREE - Pip Wilson Counselling example using BLOB TREE - Pip Wilson

Why is that? Well, to know that our file has been committed, git needs to know about the latest commit. How does git do that? It goes to the HEAD: Looking at `HEAD` on Windows Looking at `HEAD` on UNIX Thanks for reading! If you enjoyed this article, you can read more on this topic on the swimm.io blog.As we can see, git log doesn’t show anything new. Why is that? 🤔 Remember that git log traces the branches to find relevant commits to show. It shows us now test and the commit it points to, and it also shows master which points to the same commit. To create another branch, we usually use the git branch command. By doing that, we actually create another pointer. So if we create a branch called test, by using git branch test, we are actually creating another pointer that points to the same commit as the branch we are currently on. Using `git branch` creates another pointer For example, what happens when we use git commit? What is stored between commits? Is it just a diff between the current and previous commit? If so, how is the diff encoded? Or is an entire snapshot of the repo stored each time? What really happens when we use git init ? How does git know where to start when looking for a commit in the repository? As I explained earlier, it looks for HEAD, which points to the current active branch (or commit, in some cases). If you are someone or you know someone that finds it difficult to put how you are feeling into words, Ive got an easy tool that would help you understand how you feel better. The Blob tree activity

Blob Tree Tools for human development - Pip Wilson Blob Tree Tools for human development - Pip Wilson

We could always reference a commit by its SHA-1 hash, but humans usually prefer other forms to name objects. A branch is one way to reference a commit, but it’s really just that. Figure 8 says that you’re a real daydreamer — you like being in your own world and away from this one. Blobs, on the other hand, are just contents — binary streams of data. A blob doesn’t register its creation date, its name, or anything but its contents.

Now that we have our .git directory ready, can we work our way to make a commit (again, without using git add or git commit). Plumbing vs Porcelain Commands in Git The beautiful thing about the “Blob Tree” is that people can use it to communicate how they are feeling, even if they cannot articulate it verbally. I loved the “Blob Tree” from the first moment I saw it and immediately added it to my arsenal of treatment materials. After I graduated, I took it with me out into the workforce, even though I wasn’t going to work with adults who’ve had strokes. Instead, I use it with children who have Autism. That’s right — we need to change test to point to our new commit. We can do that by simply changing the contents of .git\refs\heads\test:

The Big Book of Blob Trees | Pip Wilson, Ian Long | Taylor

The answer is the test branch, as this is the active branch (since HEAD points to it). Afterwards, the test pointer will move to the newly added commit. Note that HEAD still points to test. Every time we use `git commit`, the branch pointer moves to the newly created commit. We clarified how these terms relate to git commands we know by creating a new repository and committing a file using the well-known git init, git add, and git commit. It has always been a hit because it simply shows one method of using this tool in a 121 situation:: Using the commands above, we have created a file named test.txt, with the content of Testing, created a corresponding blob, and added it to the index. We also created a tree representing the index.The difference between blobs and files is that files also contain meta-data. For example, a file “remembers” when it was created, so if you move that file into another directory, its creation time remains the same.

The Big Book of Blob Trees - 2nd Edition - Pip Wilson - Ian

We can do this with the command git write-tree, which records the contents of the index in a tree object. Of course, we can use git cat-file -t to see that it’s indeed a tree: Creating a tree object of the index In sum, a branch is just a file inside .git\refs\heads, containing a hash of the commit it refers to.In git, the equivalent of a directory is a tree. A tree is basically a directory listing, referring to blobs as well as other trees. So we now know how HEAD is implemented — it’s simply a file, and its contents describe what it points to. First, as professionals, we should strive to understand the tools we use, especially if we use them all the time — like git . While you dream of great achievements, you aren’t willing to go through the tedious, boring road that leads to success. To realize your dreams you need to ascend the tree, without fear of falling. 5. If you chose Figure 5