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To convince certain persons to shift from Clearcase to Git, I need to show them alternatives to the baselining and checking in/out documents under activity names.

How can these be achieved in Git? I only saw the tagging option coming into the picture in this scenario, but that seemed to be useful for creating version numbers rather than for baselining or activity names.

Nav
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2 Answers2

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You can read in my old answer a good comparison of ClearCase and Git.

"What are the basic ClearCase concepts every developer should know?"

They key aspect to understand is that a Git repository would be the equivalent of a UCM ClearCase component: you cannot store all components in a Git repo like you could in an UCM Vob with the (centralized) ClearCase VCS.

Once you realize that, a baseline is just like a commit of your git repo: it will reference the full content of that repo. You can add a tag on it if you want (like a full UCM baseline), but it isn't mandatory.

Each commit represents an activity: the UCM activity is a "change set": a list of changes, which is what a Git commit allows you to find.

Community
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VonC
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  • A baseline looks more like a branch to me, don't you think? "A recommended baseline is a set of versions that have been identified as stable. This baseline establishes the current starting point for the project; when a developer rebases or joins a project, this is the baseline that is used as the foundation for the development stream, unless he specifies a different baseline to be used." ([Wikipedia](https://en.wikipedia.org/wiki/Rational_ClearCase_UCM#Baseline)) – volpato Feb 04 '16 at 18:13
  • @volpato not like a branch. Like the starting point for a possible branch. – VonC Feb 04 '16 at 21:19
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git commits aren't like UCM activities. You can mimic this by manually pushing the files associated with an "activity" but the management in UCM is simplified. In UCM, you set your activity, do your work, checkin the activity (or you could checkin the files) and deliver the activity; there is no capability to deliver a single file.

Activities can also continue to worked on across multiple deliveries. A developer can keep multiple un-delivered activitied in their own stream as long as there are no version tree conflicts that cause a "drag".

Baselines too, are different. A baseline in UCM is a managed way of labelling previous and selected integration stream activities.

UCM significantly simplifies the management of multiple streams and identifying what is different between commits, who delivered them, what activities they were part of.

ClearCase and UCM are not the same product. It is UCM that provides the CM management improvements - ClearCase has many of the same features but they require more process and rigour to reach the same goal.

John Nunnington
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