How to retrieve code after git reset

In the process of using Git for version control, misoperation may cause code loss. One of them is to use the git reset command to roll back the code to a historical version. When we roll back to a historical version, the latest code will be overwritten. If there is no timely backup, this part of the code will be permanently lost. So, if this happens, how do we retrieve the lost code?

1. Use the git reflog command

git reflog command to view all operation records performed in the current warehouse, including commit, checkout, reset and other operations. When using the git reset command, it will generate an operation record, so we can use the git reflog command to see which historical versions have been reached. The specific operation steps are as follows:

• Open the command line tool and enter the directory where the code is stored;
• Execute the git reflog command, all operation records will be displayed ;
• Copy the SHA value of the operation record of rolling back to the historical version;
• Execute the git reset <SHA> command to restore the code to the specified historical version.

Please note that when using the git reset command to restore the code, we need to ensure that the code is restored to the correct historical version, otherwise more code will be lost.

2. Use the git fsck command

git fsck The command can check all objects in the Git database, including commit records, Branches, tags, etc., find unused or lost objects and print out the SHA values ​​of these objects. If we misoperate and cause code to be lost, it may also be that some objects have been deleted by mistake. Use the git fsck command to find these lost objects and restore them. The specific steps are as follows:

• Open the command line tool and enter the directory where the code is stored;
• Execute the git fsck --full command to check the Git database , find the lost object;
• If the lost object does exist in the Git database, execute thegit cat-file -p <SHA> command to print out the object;
• If the printed object is a commit record, execute the git merge <SHA> command to merge it into the current branch;
• If the printed object is a file, execute git cat-file -p <SHA> > filename command to restore the file to the local.

Please note that when using the git fsck command for data recovery, you need to be careful and confirm each lost object as much as possible. If misuse causes Git database integrity problems, you may need to use the Git database repair tool to repair it.

3. Use third-party data recovery tools

If the above methods still cannot retrieve the code, and the data is very important, or the above methods are difficult to operate, you can use a third-party Data recovery tools to try to recover lost code. These tools can usually scan a hard drive or USB flash drive and recover deleted files. Common data recovery tools include Recuva, EaseUS Data Recovery Wizard, Disk Drill, etc. Please note that you need to be careful when using these tools to avoid further damage to your data.

In short, Git provides various methods to help us retrieve lost code, especially the git reflog command and the git fsck command, which can help us retrieve it. Historical versions rolled back by misuse or lost objects. When performing data recovery, you need to pay attention to the accuracy and safety of the operation to avoid further damage to the data.

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