47 lines
2.2 KiB
Markdown
47 lines
2.2 KiB
Markdown
# Migrating from ClearCase
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[ClearCase](https://www.ibm.com/us-en/marketplace/rational-clearcase) is a set of
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tools developed by IBM which also include a centralized version control system
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similar to Git.
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A good read of ClearCase's basic concepts is can be found in this [StackOverflow
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post](https://stackoverflow.com/a/645771/974710).
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The following table illustrates the main differences between ClearCase and Git:
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| Aspect | ClearCase | Git |
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| ------ | --------- | --- |
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| Repository model | Client-server | Distributed |
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| Revision IDs | Branch + number | Global alphanumeric ID |
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| Scope of Change | File | Directory tree snapshot |
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| Concurrency model | Merge | Merge |
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| Storage Method | Deltas | Full content |
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| Client | CLI, Eclipse, CC Client | CLI, Eclipse, Git client/GUIs |
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| Server | UNIX, Windows legacy systems | UNIX, macOS |
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| License | Proprietary | GPL |
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_Taken from the slides [ClearCase and the journey to Git](https://www.open.collab.net/media/pdfs/ClearCase-and-the-journey-to-Git.pdf) provided by collab.net_
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## Why migrate
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ClearCase can be difficult to manage both from a user and an admin perspective.
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Migrating to Git/GitLab there is:
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- **No licensing costs**, Git is GPL while ClearCase is proprietary.
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- **Shorter learning curve**, Git has a big community and a vast number of
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tutorials to get you started.
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- **Integration with modern tools**, migrating to Git and GitLab you can have
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an open source end-to-end software development platform with built-in version
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control, issue tracking, code review, CI/CD, and more.
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## How to migrate
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While there doesn't exist a tool to fully migrate from ClearCase to Git, here
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are some useful links to get you started:
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- [Bridge for Git and ClearCase](https://github.com/charleso/git-cc)
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- [Slides "ClearCase and the journey to Git"](https://www.open.collab.net/media/pdfs/ClearCase-and-the-journey-to-Git.pdf)
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- [ClearCase to Git](https://therub.org/2013/07/19/clearcase-to-git/)
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- [Dual syncing ClearCase to Git](https://therub.org/2013/10/22/dual-syncing-clearcase-and-git/)
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- [Moving to Git from ClearCase](https://sateeshkumarb.wordpress.com/2011/01/15/moving-to-git-from-clearcase/)
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- [ClearCase to Git webinar](https://www.brighttalk.com/webcast/11817/162473/clearcase-to-git)
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