Hashing

• Hashing algorithms are used to generated a random number.
• If the message is same, Hash will be same
• There is no way to generate message from hash
• Alogrithms
  • MD5
  • SHA1
  • SHA256

Lets Dive into How git works

• To understand git we will be using two plumbing commands

git cat-file -t 
# it tells the type of what you are looking at
git cat-file -p 
# it prints the values 

• We have done 3 commits
  
• Lets find the type and contents of latest commit
  
• parent refers to previous commit
• author/commiter is username and email configured
• message
• tree in git refers to folder/directory & blob refers to file
• Lets see the contents of previous commit
  
  
• Lets figure out the contents of first commit which is tree b8d76bc8378818320eee5e112d0b738feebc6c11
  
• Lets see the contents of file Readme.md e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
• Now go to the second commit and print the contents
  
• two blobs have same id as the contents are same, same hash is generated by SHA1 algorithm
• Lets see contents of src
  
• as hash is same even the contents of test also will be same.
• main.py is an empty file,so the Hash matches with README.md as this is also empty
• Lets see contents of latest commit
  
• Now the tree of latest commit