Git tutorial: the difference between git pull and git clone (summary sharing)

This article brings you knowledge about the difference between git pull and git clone in the Git tutorial. I hope it will be helpful to you.

Many people on the Internet explain the difference between pull and clone. They say that pull is to update local code and clone is the process of creating local code from scratch, but there is one thing they did not mention. , I happened to have this problem again today, because I used to pull directly from the remote warehouse, but today I suddenly found that pull cannot be used, and clone only takes effect, and I realized this problem. Decided to record it.

1 git pull

git pull is suitable for pulling down code from the repository that the user has permission to, regardless of whether there is local code.

Because I usually pull down the code directly via git pull.

1.1 Warehouses I have permissions

The warehouses I have permissions refer to my own or the warehouses in my team that I can use .

To use git pull, you must first make sure you are connected to the remote repository. Otherwise, if you directly git pull origin master, Github will ask you: "What master? Which master? Are you my master?"

So you must first connect to the remote warehouse.

init initializes a blank local warehouse, with nothing in it except .git

Connect to the remote warehouse

1.1.1 There is no local code

git remote -v is used to display the remote repository connected to the current local repository. You can connect to several. Then a warehouse exists in pairs, one for upload and one for pull-down. I generally call the origin in the front the name of the remote warehouse, and the one in the back is your connection method.

Now it shows that I am connected to a github remote warehouse named origin.

#In a blank warehouse, you can directly use git pull to pull down the code.

1.1.2 Local code

What happens if there is local code?

• Team work, one warehouse is used by multiple people

• Your own warehouse, you use it on multiple computers (such as one in the dormitory, one in the experiment Room one)

Why do you need git pull? The code version is different on different computers. So in order to reduce work and ensure consistent code versions, pull down the code every time you write code. After writing, push to the remote repository. Draw a picture to explain.

1.2 The warehouse I don’t have permissions

The warehouse I don’t have permissions refers to someone else 's warehouse. If others don't give you permission, of course you can't modify their code at will.

Git pull cannot be used for warehouses without permission. For example:

Today I downloaded the code as usual. But this is my first time downloading someone else's code.

I add the repository link as usual and git pull the drop down. But he prompted me:

Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rightsand the repository exists.

Permission denied means that the SSH key cannot be used. Let me confirm whether I have permission to access or whether the repository exists.

The warehouse does exist. So I must not have permission.

Explain the three-step operation:

• Add a remote warehouse and connect with SSH

• Pull down the code from the master branch of the warehouse

• Delete the remote warehouse I added (since it cannot be used, of course I deleted it)

At this time I remembered: SSH is only available to the repository owner. Because the SSH configured on your computer is paired with the SSH on your github, you can use SSH only if you use your github repository on your computer.

Since only the warehouse owner can use SSH, then I can just switch to HTTP. (I haven’t realized the seriousness of the problem at this time)

I added an https connection

In the second step, I pulled down the warehouse

Then he prompted me:

fatal: unable to access 'github.com/hitvoice/Dr…': OpenSSL SSL_read: Connection was reset, errno 10054

It means I still can't connect.

At this time I suddenly realized the problem: neutral_face:. This seems to be someone else's warehouse. I can't use remote to connect to the remote warehouse and then pull it down. Because if I can connect, it means I can modify other people's code at will. So I definitely can't pull the code in this way! ! !

So you have to use git clone

2 git clone

git clone is suitable for local code without code, you need to download it. You cannot connect to the remote repository. It can be used with or without warehouse permissions.

Continuing from the above, after realizing the use of git clone, I deleted the HTTPS connection to the remote warehouse just now, and then directly git clone, and the code was successfully downloaded.

I deleted the above https method to connect to the remote warehouse

git remote -v is used to check which remote warehouses your local warehouse is connected to. If When connected, the warehouse code and connection method will be displayed. The output here is blank, which means that no remote warehouse is connected.

git clone downloaded the code successfully.

The above mentioned is someone else’s warehouse, but what if it is a warehouse that I have permission to use?

Create a new local warehouse. It's obviously a success. If SSH can succeed, then HTTPS must succeed. If you can succeed without remote, you will definitely succeed if you use remote.

Recommended study: "Git Tutorial"

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