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47 lines
2.4 KiB
47 lines
2.4 KiB
9 years ago
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# Britney - Keeps suites installable and up to date
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Britney is a program to compute an update of a Debian-based package suite
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by feeding it updates from (one or more) source-suite(s). A few known use
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cases:
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* Debian uses it to update testing based on unstable
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* Ubuntu uses it to update their latest development suite using a "hidden" -proposed suite as source
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Britney's primary goal is too keep packages in the target suite installable
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(e.g. Debian testing) while keeping it up to daye with its primary source
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suite (e.g. Debian unstable).
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## Quick setup guide
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TODO: Write a quick setup guide (once mirror layout has been tested)
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## Migration items
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Britney generally works with a "migration item", which is a group of binary
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packages (and possibly a source package). Packages are bundled into these
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migration items under the following rules:
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1. "source migration": An update of the source package. This will include all the binary packages built from that source version (regardless of architecture).
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* Can contain binaries built from earlier source version depending on the setting of "IGNORE_CRUFT"
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* Britney refers to these as "${SOURCE_NAME}"
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1. "binary migration": An update of binary packages on a given architecture to an existing source package in the target suite.
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* Two common cases: Built for the first time on a new architecture and binNMUs
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* Britney refers to all cases of these as "${SOURCE_NAME}/${ARCHITECTURE}"
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1. "removal item": A removal of a source or binary package.
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* Note that it is only possible to trigger "source" removals via hints. Binary removals are items generated by Britney to clean up the target suite.
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* Britney refers to these as "-${SOURCE_NAME}" or "-${BINARY_NAME}/${ARCHITECTURE}" depending on the case.
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## Migration rules (excuses/policies)
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Britney applies a number of policies to migration items before attempting
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to migrate them to the target suite. These policies can "reject" a
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package and prevent it from migrating. Some policies/built-in rules:
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* Age policy: Lets source migrations age a bit before they are allowed to migrate
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- Supports variable length based on package urgency
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* RC Bug policy: Rejects packages with regressions in RC bugs
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- Requires an external tool to keep the bug lists up to date
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* Keeps architectures in sync: Source migrations updating existing packages only occur if architectures are up to date
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- Can be configured to ignore certain architectures.
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