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Version Management with CVS - the CVS manual
by Per Cederqvist et al.
Paperback (6"x9"), 216 pages, 8 figures
ISBN 0954161718
RRP £19.95 ($29.95)

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5.4 Branches and revisions

Ordinarily, a file's revision history is a linear series of increments (see section 4.1 Revision numbers): However, CVS is not limited to linear development. The revision tree can be split into branches, where each branch is a self-maintained line of development. Changes made on one branch can easily be moved back to the main trunk.

Each branch has a branch number, consisting of an odd number of period-separated decimal integers. The branch number is created by appending an integer to the revision number where the corresponding branch forked off. Having branch numbers allows more than one branch to be forked off from a certain revision.

All revisions on a branch have revision numbers formed by appending an ordinal number to the branch number. The following figure illustrates branching with an example. The exact details of how the branch number is constructed is not something you normally need to be concerned about, but here is how it works: When CVS creates a branch number it picks the first unused even integer, starting with 2. So when you want to create a branch from revision 6.4 it will be numbered 6.4.2. All branch numbers ending in a zero (such as 6.4.0) are used internally by CVS (see section 5.5 Magic branch numbers). The branch 1.1.1 also has a special meaning (see section 13 Tracking third-party sources).

ISBN 0954161718Version Management with CVS - the CVS manualSee the print edition