![]() Ace/V1/db/dbDefN.cpp#1 - branch from //Ace/MAIN/db/dbDefN.cpp#1,#7 The -v flag on integ does that: p4 integ -v //Ace/MAIN/. You can, at your optionally skip the workspace copying. It assumes that if you are creating a new branch, you’re going to want to work on the newly branched files.Ī really huge tree of files, a copy of the whole thing in your workspace may be the last thing you want. Perforce does this as a convenience to you. You may think it heavy-handed that Perforce copies files into your workspace when all you’re trying to do is create a new branch in the depot. Later in this book, you’ll see how Perforce branching can be used to configure products, distribute software, trace object origins, and shepherd web content, among other things. However, the classic case is certainly not the only use to which Perforce branching can be applied. We’ll use the classic branch-for-release use case throughout this chapter to demonstrate Perforce commands and their consequences. ![]() And if it’s too late for that, this chapter will at least help you understand your prior missteps. The goal of this chapter is to front-load you with knowledge to keep you from making the common mistakes the first time out. Many branch and integration operations in Perforce are quite simple, of course, but some of the simplest ones are a bit unintuitive and one or two of the essential ones just aren’t that simple. If all this were as simple it sounds, you wouldn’t need this book. Given a pair of branches, Perforce can tell us which changes have already been integrated from one into the other, and which have yet to be integrated. As we successively integrate changes between a pair of branches, Perforce uses file history to keep us from having to re-merge changes we’ve already merged.Įven more important is that Perforce can tell us the integration history of a branch. Perforce keeps track of a file’s integration Although every branched file is a file in its own right, its lineage is stored in the Perforce database. And changes made in one branch can be merged or otherwise integrated to the other.īehind the scenes, Perforce keeps track of branching. Files in either branch can be edited, added, deleted, renamed, or moved. Moreover, every file is a full-fledged file in its own right. The two file trees are peers in the depot hierarchy. We clone a tree of files so that we can make changes to either tree-or branch-without affecting the other. This notion of cloning a tree of files from another is the essence of branching The //Ace/V1 tree holds the stable, 1.0 version of the product, and the //Ace/MAIN tree holds the bleeding-edge, unreleased version. Over time, content diverges between the two trees as new development proceeds. In either case, the change is considered integrated when you’ve decided what to do about it and Perforce has recorded your decision.įigure 4-2. Cloning //Ace/V1 from //Ace/MAINĪt the outset, every file in the //Ace/MAIN tree has an identical counterpart in the //Ace/V1 tree. A change can be integrated from branch to branch by merging, when appropriate, or by simply deciding that it should be ignored. The business of accounting for every change is what Perforce calls integrating. ( Why was this change never merged? Is it not applicable? Or did someone simply forget to merge it? ) Even so, every change has to be accounted for when you’re trying to figure out what needs merging. ![]() It’s based on the notion that, even when two branches are closely related, not all changes in one branch can be merged into the other. This is not a capricious choice of words. In Perforce, we say we integrate changes from one branch into another. P4MERGE P4V VISUAL CLIENT SOFTWAREIt’s common to hear people in the software development world say they merge changes from one branch into another. We’ll discuss branch views later in this chapter. ![]() The command creates Perforce database objects called “branches” but these objects are not branches at all. ( Codeline and stream are other words for this set.)ĭon’t confuse the term branch with the P4 branch command. In this book we use the term branch to mean a set of files that is a variant of another, each set evolving independently. ![]()
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