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=============================
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Reasons to Sign Your Repository
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--------------------------------
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Bazaar can sign revisions using GnuPG, a Free Software implementation of the
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OpenPGP digital signature format. By signing commits a person wanting to
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make use of a branch can be confident where the code came from, assuming the
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GnuPG keys used can be verified. This could for example prevent worry about
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compromised code in the case where a server hosting Bazaar branches has been
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hacked into. It could also be used to verify that all code is written by a
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select group of people, such as if contributor agreements are needed.
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Signatures are passed around with commits during branch, push, merge and other
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There are many guides to creating a digital signature key with GnuPG. See
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for example the `GnuPG Handbook
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<http://www.gnupg.org/gph/en/manual.html#AEN26>`_ or the `Launchpad Wiki
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<https://help.launchpad.net/YourAccount/ImportingYourPGPKey>`_.
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To sign commits as they are made turn on the ``create_signatures``
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configuration option in your ``bazaar.conf`` or ``locations.conf`` file::
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create_signatures = always
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When you next make a commit it will ask for the pass phrase for your GnuPG key.
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If you want GnuPG to remember your password ensure you have ``gnupg-agent``
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To sign previous commits to a branch use ``sign-my-commits``. This will go
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through all revisions in the branch and sign any which match your
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commit name. You can also pass the name of a contributor to ``sign-my-commits``
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to sign someone else's commits or if your GnuPG key does not match your Bazaar
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bzr sign-my-commits . "Amy Pond <amy@example.com>"
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It will not sign commits which already have a signature.
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To sign a single commit or a range of commits use the (hidden) command
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``re-sign`` is also useful to change an existing signature.
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Signatures can be verified with the ``bzr verify-signatures`` command. By
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default this will check all commits in the branch and notify that all commits
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are signed by known trusted signatures. If not all commits have trusted
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signatures it will give a summary of the number of commits which are invalid,
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having missing keys or are not signed.
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The ``verify-signatures`` command can be given a comma separated list of key
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patters to specify a list of acceptable keys. It can also take a range of
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commits to verify in the current branch. Finally using the verbose option will
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list each key that is valid or authors for commits which failed::
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$bzr verify-signatures -kamy -v -r 1..5
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1 commit with valid signature
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Amy Pond <amy@example.com> signed 4 commits
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0 commits with unknown keys
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1 commit by author The Doctor <doctor@example.com>
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There is still a number of digital signature related features which are hoped
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to be added to Bazaar soon. These include verificiation in logs, qbzr
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integration and setting branches to require signatures.
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doc/en/user-guide/gpg_signatures.txt
