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Current for bzr-0.16, 2007-05
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If you are already familiar with decentralized version control, then
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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". If,
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on the other hand, you are familiar with version control but not
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decentralized version control, then please start at "How DVCS is
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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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The purpose of version control
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==============================
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The Purposes of Revision Control
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================================
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Odds are that you have worked on some sort of textual data -- the sources
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to a program, web sites or the config files that Unix system
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do something you wish you hadn't, you can restore the directory to the way
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it looked at some point in the past.
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Version control systems give users the ability to save changes to a
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Revision control systems give users the ability to save changes to a
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branch by "committing a **revision**". The revision created is essentially
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a summary of the changes that were made since the last time the tree was
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These revisions have other uses as well. For example, one can comment
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revisions to record what the recent set of changes meant by providing an
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the web template to close the table" and "Added sftp suppport. Fixes #595"
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We keep these logs so that if later there is some sort of problem with
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sftp, we can figure out when the problem probably happened.
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Many Version Control Systems (VCS) are stored on servers. If one wants to
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work on the code stored within a VCS, then one needs to connect to the
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sftp, we can figure out when the problem probably happened.
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Many Revision Control Systems (RCS) are stored on servers. If one wants to
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work on the code stored within an RCS, then one needs to connect to the
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server and "checkout" the code. Doing so gives one a directory in which a
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person can make changes and then commit. The VCS client then connects to
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the VCS server and stores the changes. This method is known as the
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person can make changes and then commit. The RCS client then connects to
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the RCS server and stores the changes. This method is known as the
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The centralized model can have some drawbacks. A centralized VCS requires
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The centralized model can have some drawbacks. A centralized RCS requires
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that one is able to connect to the server whenever one wants to do version
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control work. This can be a bit of a problem if your server is on some other
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machine on the internet and you are not. Or, worse yet, you **are** on the
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internet but the server is missing!
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Decentralized Version Control Systems (which I'll call DVCS after this
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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'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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user only needs internet access when he wants to access the changes in
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someone else's branch that are somewhere else.
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A common requirement that many people have is the need to keep track of
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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. 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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a **revision** of the directory tree whenever the user asks.
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Version control software such as Bazaar can do much more than just
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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 a developer can
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take the modifications in one branch of software and apply them to a
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related branch -- even if those changes exist in a branch owned by
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==============================
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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``. Some arguments
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subcommand of this. You can get some help with ``bzr help``. Some arguments
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are grouped in topics: ``bzr help topics`` to see which topics are available.
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There will be more in the future.
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One function of a version control system is to keep track of who changed
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what. In a decentralized system, that requires an identifier for each
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author that is globally unique. Most people already have one of these: an
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email address. Bazaar is smart enough to automatically generate an email
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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 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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% bzr whoami "Your Name <email@example.com>"
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If you'd like to use a different address for a specific branch, enter
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the branch folder and use::
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% bzr whoami --branch "Your Name <email@example.com>"
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#. Setting the email address in the ``~/.bazaar/bazaar.conf`` [1]_ by
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adding the following lines. Please note that ``[DEFAULT]`` is case
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email=Your Name <email@isp.com>
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As above, you can override this settings on a branch by branch basis
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by creating a branch section in ``~/.bazaar/locations.conf`` and
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adding the following lines::
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[/the/path/to/the/branch]
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email=Your Name <email@isp.com>
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#. Overriding the two previous options by setting the global environment
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variable ``$BZR_EMAIL`` or ``$EMAIL`` (``$BZR_EMAIL`` will take
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precedence) to your full email address.
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1. Set an email address via ``bzr whoami``. This is the simplest way.
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To set a global identity, use::
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% bzr whoami "Your Name <email@example.com>"
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If you'd like to use a different address for a specific branch, enter
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the branch folder and use::
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% bzr whoami --branch "Your Name <email@example.com>"
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#. Setting the email address in the ``~/.bazaar/bazaar.conf`` [1]_ by adding the following lines.
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Please note that ``[DEFAULT]`` is case sensitive::
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email= Your Name <email@isp.com>
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As above, you can override this settings on a branch by branch basis by
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creating a branch section in ``~/.bazaar/locations.conf`` and adding the
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[/the/path/to/the/branch]
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email=Your Name <email@isp.com>
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#. Overriding the two previous options by setting the global environment
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variable ``$BZREMAIL`` or ``$EMAIL`` (``$BZREMAIL`` will take precedence)
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to your full email address.
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.. [1] On Windows, the users configuration files can be found in the
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application data directory. So instead of ``~/.bazaar/branch.conf``
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the configuration file can be found as:
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the configuration file can be found as:
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``C:\Documents and Settings\<username>\Application Data\Bazaar\2.0\branch.conf``.
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The same is true for ``locations.conf``, ``ignore``, and the
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``plugins`` directory.
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its test suite before committing, to make sure that every revision is a
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known-good state. You can also review your changes, to make sure you're
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committing what you intend to, and as a chance to rethink your work before
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you permanently record it.
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you permanently record it.
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Two bzr commands are particularly useful here: **status** and **diff**.
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Two bzr commands are particularly useful here: **status** and **diff**.
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With the ``-r`` option, the tree is compared to an earlier revision, or
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With the ''-r'' option, the tree is compared to an earlier revision, or
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the differences between two versions are shown::
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% bzr diff -r 1000.. # everything since r1000
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% bzr diff -r 1000..1100 # changes from 1000 to 1100
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The ``--diff-options`` option causes bzr to run the external diff program,
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The --diff-options option causes bzr to run the external diff program,
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passing options. For example::
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% bzr diff --diff-options --side-by-side foo
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Some projects prefer patches to show a prefix at the start of the path
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for old and new files. The ``--prefix`` option can be used to provide
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As a shortcut, ``bzr diff -p1`` produces a form that works with the
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Some projects prefer patches to show a prefix at the start of the path for
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old and new files. The --prefix option can be used to provide such a prefix.
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As a shortcut, ``bzr diff -p1`` produces a form that works with the
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command ``patch -p1``.
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Committing changes
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==================
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When the working tree state is satisfactory, it can be **committed** to
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the branch, creating a new revision holding a snapshot of that state.
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the branch, creating a new revision holding a snapshot of that state.
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% bzr commit -m "added my first file"
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You can also use the ``-F`` option to take the message from a file. Some
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You can also use the -F option to take the message from a file. Some
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people like to make notes for a commit message while they work, then
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review the diff to make sure they did what they said they did. (This file
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can also be useful when you pick up your work after a break.)
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Message from an editor
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----------------------
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======================
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If you use neither the ``-m`` nor the ``-F`` option then bzr will open an
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If you use neither the `-m` nor the `-F` option then bzr will open an
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editor for you to enter a message. The editor to run is controlled by
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your ``$VISUAL`` or ``$EDITOR`` environment variable, which can be overridden
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by the ``editor`` setting in ``~/.bazaar/bazaar.conf``; ``$BZR_EDITOR`` will
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your `$VISUAL` or `$EDITOR` environment variable, which can be overridden
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by the `editor` setting in to ~/.bazaar/bazaar.conf; `$BZR_EDITOR` will
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override either of the above mentioned editor options. If you quit the
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editor without making any changes, the commit will be cancelled.
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The file that is opened in the editor contains a horizontal line. The part
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of the file below this line is included for information only, and will not
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form part of the commit message. Below the separator is shown the list of
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files that are changed in the commit. You should write your message above
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the line, and then save the file and exit.
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If you would like to see the diff that will be committed as you edit the
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message you can use the ``--show-diff`` option to ``commit``. This will include
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the diff in the editor when it is opened, below the separator and the
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information about the files that will be committed. This means that you can
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read it as you write the message, but the diff itself wont be seen in the
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commit message when you have finished. If you would like parts to be
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included in the message you can copy and paste them above the separator.
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Marking bugs as fixed
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---------------------
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Many changes to a project are as a result of fixing bugs. Bazaar can keep
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metadata about bugs you fixed when you commit them. To do this you use the
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``--fixes`` option. This option takes an argument that looks like this::
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% bzr commit --fixes <tracker>:<id>
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Where ``<tracker>`` is an identifier for a bug tracker and ``<id>`` is an
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identifier for a bug that is tracked in that bug tracker. ``<id>`` is usually
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a number. Bazaar already knows about a few popular bug trackers. They are
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bugs.launchpad.net, bugs.debian.org, and bugzilla.gnome.org. These trackers
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have their own identifiers: lp, deb, and gnome respectively. For example,
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if you made a change to fix the bug #1234 on bugs.launchpad.net, you would
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use the following command to commit your fix::
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% bzr commit -m "fixed my first bug" --fixes lp:1234
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For more information on this topic or for information on how to configure
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other bug trackers please read `Bug Tracker Settings`_.
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.. _Bug Tracker Settings: ../user-reference/index.html#bug-tracker-settings
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If you've made some changes and don't want to keep them, use the
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**revert** command to go back to the previous head version. It's a good
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idea to use ``bzr diff`` first to see what will be removed. By default the
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idea to use **bzr diff** first to see what will be removed. By default the
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revert command reverts the whole tree; if file or directory names are
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given then only those ones will be affected. ``bzr revert`` also clears the
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given then only those ones will be affected. **revert** also clears the
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list of pending merges revisions.
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Many source trees contain some files that do not need to be versioned,
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such as editor backups, object or bytecode files, and built programs. You
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can simply not add them, but then they'll always crop up as unknown files.
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You can also tell bzr to ignore these files by adding them to a file
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called ``.bzrignore`` at the top of the tree.
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called ''.bzrignore'' at the top of the tree.
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This file contains a list of file wildcards (or "globs"), one per line.
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Typical contents are like this::
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If a glob contains a slash, it is matched against the whole path from the
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top of the tree; otherwise it is matched against only the filename. So
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the previous example ignores files with extension ``.o`` in all
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subdirectories, but this example ignores only ``config.h`` at the top level
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subdirectories, but this example ignores only config.h at the top level
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and HTML files in ``doc/``::
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To get a list of which files are ignored and what pattern they matched,
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use ``bzr ignored``::
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use ''bzr ignored''::
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config.h ./config.h
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% bzr commit -m "Add ignore patterns"
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As an alternative to editing the ``.bzrignore`` file, you can use the
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``bzr ignore`` command. The ``bzr ignore`` command takes filenames and/or
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patterns as arguments and then adds them to the ``.bzrignore`` file. If a
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``.bzrignore`` file does not exist the ``bzr ignore`` command will
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automatically create one for you, and implicitly add it to be versioned::
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Just like when editing the ``.bzrignore`` file on your own, you should
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commit the automatically created ``.bzrignore`` file::
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% bzr commit -m "Added tags to ignore file"
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There are some ignored files which are not project specific, but more user
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The ``bzr log`` command shows a list of previous revisions. The ``bzr log
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--forward`` command does the same in chronological order to get most
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The **bzr log** command shows a list of previous revisions. The **bzr log
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--forward** command does the same in chronological order to get most
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recent revisions printed at last.
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As with ``bzr diff``, ``bzr log`` supports the ``-r`` argument::
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As with bzr diff, bzr log supports the -r argument::
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% bzr log -r 1000.. # Revision 1000 and everything after it
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% bzr log -r ..1000 # Everything up to and including r1000
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You can delete files or directories by just deleting them from the working
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directory. This is a bit different to CVS, which requires that you also
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``bzr remove`` makes the file un-versioned, but may or may not delete the
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working copy [2]_. This is useful when you add the wrong file, or decide that
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a file should actually not be versioned.
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**bzr remove** makes the file un-versioned, but may or may not delete
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the working copy [2]_. This is useful when you add the wrong file,
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or decide that a file should actually not be versioned.
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% bzr push sftp://servername.com/path/to/directory
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% bzr push sftp://servername.com/path/to/directory
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(The destination directory must already exist unless the
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``--create-prefix`` option is used.)
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* Another option is the ``rspush`` plugin that comes with BzrTools, which
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* Another option is the rspush plugin that comes with BzrTools, which
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uses rsync to push the changes to the revision history and the working
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* You can also copy the files around manually, by sending a tarball, or using
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rsync, or other related file transfer methods. This is usually less safe
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than using ``push``, but may be faster or easier in some situations.
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Moving changes between trees
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You can also use copy the files around manually, by sending a tarball, or
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using rsync, or other related file transfer methods. This is usually
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less safe than using ``push``, but may be faster or easier in some
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Moving changes between trees
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============================
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It happens to the best of us: sometimes you'll make changes in the wrong
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This will apply all of the uncommitted changes you made in OLDDIR to NEWDIR.
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It will not apply committed changes, even if they could be applied to NEWDIR
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with a regular merge. The changes will remain in OLDDIR, but you can use ``bzr
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revert OLDDIR`` to remove them, once you're satisfied with NEWDIR.
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with a regular merge. The changes will remain in OLDDIR, but you can use **bzr
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revert OLDDIR** to remove them, once you're satisfied with NEWDIR.
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NEWDIR does not have to be a copy of OLDDIR, but they should be related.
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The more different they are, the greater the chance of conflicts.
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doc/tutorial.txt
