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If you are already familiar with decentralized revision control, then
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please feel free to skip ahead to "Introducing Yourself to Bazaar-NG". If,
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please feel free to skip ahead to "Introducing Yourself to Bazaar". If,
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on the other hand, you are familiar with revision control but not
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decentralized revision control, then please start at "How DRCS is
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different." Otherwise, get some coffee or tea, get comfortable and get
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deleted the configuration file for your mailserver or perhaps mauled the
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source code for a pet project. Whatever happened, you have just deleted
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important information that you would desperately like to get back. If this
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has ever happened to you, then you are probably ready for Bazaar-NG.
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has ever happened to you, then you are probably ready for Bazaar.
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Revision control systems (which I'll henceforth call RCS) such as
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Bazaar-NG give you the ability to track changes for a directory by turning
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Bazaar give you the ability to track changes for a directory by turning
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it into something slightly more complicated than a directory that we call
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a **branch**. The branch not only stores how the directory looks right
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now, but also how it looked at various points in the past. Then, when you
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Decentralized Revision Control Systems (which I'll call DRCS after this
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point) deal with this problem by keeping branches on the same machine as
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the client. In Bazaar-NG's case, the branch is kept in the same place as
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the client. In Bazaar's case, the branch is kept in the same place as
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the code that is being version controlled. This allows the user to save
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his changes (**commit**) whenever he wants -- even if he is offline. The
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user only needs internet access when he wants to access the changes in
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the changes for a directory such as file and subdirectory changes.
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Performing this tracking by hand is a awkward process that over time
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becomes unwieldy. That is, until one considers version control tools such
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as Bazaar-NG. These tools automate the process of storing data by creating
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as Bazaar. These tools automate the process of storing data by creating
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a **revision** of the directory tree whenever the user asks.
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Revision control software such as Bazaar-NG can do much more than just
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storage and performing undo. For example, with Bazaar-NG developer can
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Revision control software such as Bazaar can do much more than just
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storage and performing undo. For example, with Bazaar developer can
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take the modifications in one branch of software and apply them to
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another, related, branch -- even if those changes exist in a branch owned
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by somebody else. This allows developers to cooperate without giving write
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access to repository.
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Bazaar-NG remembers the ''ancestry'' of a revision: the previous revisions
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Bazaar remembers the ''ancestry'' of a revision: the previous revisions
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that it is based upon. A single revision may have more than one direct
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descendant, each with different changes, representing a divergence in the
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evolution of the tree. By branching, Bazaar-NG allows multiple people to
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evolution of the tree. By branching, Bazaar allows multiple people to
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cooperate on the evolution of a project, without all needing to work in
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strict lock-step. Branching can be useful even for a single developer.
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Introducing yourself to Bazaar-NG
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=================================
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Introducing yourself to Bazaar
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==============================
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Bazaar-NG installs a single new command, **bzr**. Everything else is a
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Bazaar installs a single new command, **bzr**. Everything else is a
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subcommand of this. You can get some help with `bzr help`. There will be
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more in the future.
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author that is globally unique. Most people already have one of these: an
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email address. Bzr is smart enough to automatically generate an email
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address by looking up your username and hostname. If you don't like the
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guess that Bazaar-NG makes, then three options exist:
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guess that Bazaar makes, then three options exist:
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1. Set an email address via ``bzr whoami``. This is the simplest way.
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To set a global identity, use::
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giving the name of the directory containing the branch. bzr also supports
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accessing branches over http, for example::
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% bzr log http://bazaar-ng.org/bzr/bzr.dev/
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% bzr log http://bazaar-vcs.org/bzr/bzr.dev/
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By installing bzr plugins you can also access branches over the sftp or
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something like rsync. You can also use bzr to fetch a copy. Because this
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new copy is potentially a new branch, the command is called *branch*::
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% bzr branch http://bazaar-ng.org/bzr/bzr.dev
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% bzr branch http://bazaar-vcs.org/bzr/bzr.dev
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This copies down the complete history of this branch, so we can do all
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doc/tutorial.txt
