The core Git is often called "plumbing", with the prettier user
interfaces on top of it called "porcelain". You may not want to use the
plumbing directly very often, but it can be good to know what the
-plumbing does for when the porcelain isn't flushing.
+plumbing does when the porcelain isn't flushing.
Back when this document was originally written, many porcelain
commands were shell scripts. For simplicity, it still uses them as
@@ -1 +1,2 @@
Hello World
+It's a new day for git
-----
+------------
i.e. the diff of the change we caused by adding another line to `hello`.
In fact, together with the 'git rev-list' program (which generates a
list of revisions), 'git diff-tree' ends up being a veritable fount of
-changes. A trivial (but very useful) script called 'git whatchanged' is
-included with Git which does exactly this, and shows a log of recent
-activities.
-
-To see the whole history of our pitiful little git-tutorial project, you
-can do
-
-----------------
-$ git log
-----------------
-
-which shows just the log messages, or if we want to see the log together
-with the associated patches use the more complex (and much more
-powerful)
-
-----------------
-$ git whatchanged -p
-----------------
-
-and you will see exactly what has changed in the repository over its
-short history.
-
-[NOTE]
-When using the above two commands, the initial commit will be shown.
-If this is a problem because it is huge, you can hide it by setting
-the log.showroot configuration variable to false. Having this, you
-can still show it for each command just adding the `--root` option,
-which is a flag for 'git diff-tree' accepted by both commands.
-
-With that, you should now be having some inkling of what Git does, and
-can explore on your own.
-
-[NOTE]
-Most likely, you are not directly using the core
-Git Plumbing commands, but using Porcelain such as 'git add', `git-rm'
-and `git-commit'.
+changes. You can emulate `git log`, `git log -p`, etc. with a trivial
+script that pipes the output of `git rev-list` to `git diff-tree --stdin`,
+which was exactly how early versions of `git log` were implemented.
Tagging a version
$ git update-index --refresh
----------------
+
-in the new repository to make sure that the index file is up-to-date.
+in the new repository to make sure that the index file is up to date.
Note that the second point is true even across machines. You can
duplicate a remote Git repository with *any* regular copy mechanism, be it
----------------
where the `-u` flag means that you want the checkout to keep the index
-up-to-date (so that you don't have to refresh it afterward), and the
+up to date (so that you don't have to refresh it afterward), and the
`-a` flag means "check out all files" (if you have a stale copy or an
older version of a checked out tree you may also need to add the `-f`
flag first, to tell 'git checkout-index' to *force* overwriting of any old
Again, this can all be simplified with
----------------
-$ git clone rsync://rsync.kernel.org/pub/scm/git/git.git/ my-git
+$ git clone git://git.kernel.org/pub/scm/git/git.git/ my-git
$ cd my-git
$ git checkout
----------------
[NOTE]
If there were more commits on the 'master' branch after the merge, the
merge commit itself would not be shown by 'git show-branch' by
-default. You would need to provide '--sparse' option to make the
+default. You would need to provide `--sparse` option to make the
merge commit visible in this case.
Now, let's pretend you are the one who did all the work in
One of the following transports can be used to name the
repository to download from:
-Rsync::
- `rsync://remote.machine/path/to/repo.git/`
-+
-Rsync transport is usable for both uploading and downloading,
-but is completely unaware of what git does, and can produce
-unexpected results when you download from the public repository
-while the repository owner is uploading into it via `rsync`
-transport. Most notably, it could update the files under
-`refs/` which holds the object name of the topmost commits
-before uploading the files in `objects/` -- the downloader would
-obtain head commit object name while that object itself is still
-not available in the repository. For this reason, it is
-considered deprecated.
-
SSH::
`remote.machine:/path/to/repo.git/` or
+
First, you need to create an empty repository on the remote
machine that will house your public repository. This empty
-repository will be populated and be kept up-to-date by pushing
+repository will be populated and be kept up to date by pushing
into it later. Obviously, this repository creation needs to be
done only once.
will do it for you. If you followed the tutorial examples, you
would have accumulated about 17 objects in `.git/objects/??/`
directories by now. 'git repack' tells you how many objects it
-packed, and stores the packed file in `.git/objects/pack`
+packed, and stores the packed file in the `.git/objects/pack`
directory.
[NOTE]
When a repository is synchronized via `git push` and `git pull`
objects packed in the source repository are usually stored
-unpacked in the destination, unless rsync transport is used.
+unpacked in the destination.
While this allows you to use different packing strategies on
both ends, it also means you may need to repack both
repositories every once in a while.
convenient to organize your project with an informal hierarchy
of developers. Linux kernel development is run this way. There
is a nice illustration (page 17, "Merges to Mainline") in
-link:http://www.xenotime.net/linux/mentor/linux-mentoring-2006.pdf[Randy Dunlap's presentation].
+https://web.archive.org/web/20120915203609/http://www.xenotime.net/linux/mentor/linux-mentoring-2006.pdf[Randy Dunlap's presentation].
It should be stressed that this hierarchy is purely *informal*.
There is nothing fundamental in Git that enforces the "chain of
would contain a call to 'git update-server-info'
but you need to manually enable the hook with
`mv post-update.sample post-update`. This makes sure
-'git update-server-info' keeps the necessary files up-to-date.
+'git update-server-info' keeps the necessary files up to date.
3. Push into the public repository from your primary
repository.
A recommended work cycle for a "subsystem maintainer" who works
on that project and has an own "public repository" goes like this:
-1. Prepare your work repository, by 'git clone' the public
+1. Prepare your work repository, by running 'git clone' on the public
repository of the "project lead". The URL used for the
initial cloning is stored in the remote.origin.url
configuration variable.
Working with Others, Shared Repository Style
--------------------------------------------
-If you are coming from CVS background, the style of cooperation
+If you are coming from a CVS background, the style of cooperation
suggested in the previous section may be new to you. You do not
-have to worry. Git supports "shared public repository" style of
+have to worry. Git supports the "shared public repository" style of
cooperation you are probably more familiar with as well.
See linkgit:gitcvs-migration[7] for the details.
++* [master~2] Pretty-print messages.
------------
-Note that you should not do Octopus because you can. An octopus
+Note that you should not do Octopus just because you can. An octopus
is a valid thing to do and often makes it easier to view the
commit history if you are merging more than two independent
changes at the same time. However, if you have merge conflicts
linkgit:gittutorial-2[7],
linkgit:gitcvs-migration[7],
linkgit:git-help[1],
-link:everyday.html[Everyday git],
+linkgit:giteveryday[7],
link:user-manual.html[The Git User's Manual]
GIT
---
-Part of the linkgit:git[1] suite.
+Part of the linkgit:git[1] suite