[Git] Intro

Version Control System (VCS)

Centralized Version Control System (CVCS)Ex: CVS, Subversion, PerforceWe may encounter the errors/bugs in the center.When errors occur, we only last the Individual Snapshots on local devices.Distributed Version Control System (DVCS)Ex: Git, BazaarClient not only copy codes, but the complete image of repo and history.

Git History

Use Distributed Version Control System: BitKeeper (2002-2005)Advantages of Git:QuickSimpleNon-linear Distribution (Allow lots of branches)Maintain the large-scale project: Linux Kernel

What's Git

Git is similar to other VCS like Subversion, but treat data in a different way.Most VCSs store data with Document-List based (CVS, Subversion, Perforce, Bazaar, it's also called Delta-based VCS.Git treat documents as series of snapshots:At each staged, it would create a snapshot based on current files, and store the index of snapshot.If files aren't changed, Git would create a link, pointing to last-stored files.A.K.A Git Flow

Local Machine

Most instructions are accessed with local machine and resources.Thus, we have the complete history of the repo.

Advantages of Git: Integrity

Git would create/generate the checksum before storing data.Standard of hash: SHA-1, SHA-256.Git store data with index based on the checksum of docs contents, not the name of docs.

The status of Git

ModifiedStagedCommitted