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Snapcraft allows easy crafting of snap packages for the Ubuntu Core
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transactional system. It is designed to make it easy to incorporate
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components from different sources like github, launchpad or npm.
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All dependencies are bundled in a snap...
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A central aspect of a snapcraft recipe is a "part". A part is a piece
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of software or data that the snap package requires to work or to
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build other parts. Each part is managed by a snapcraft plugin and parts
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are independent of each other.
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Snapcraft plugins are written in python and have a yaml
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description. This allows to easily extend snapcraft with custom
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plugins. A lot of default plugins are included, for example for
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projects written in go, java, python or autotools. It is also possible
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to simply download content as part of the snapcraft recipe.
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Each part goes through the following steps:
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The first is that each part is pulled. This step will download
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content, e.g. checkout a git repository or download a binary component
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like the java sdk. Snapcraft will create a parts/ directory with
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sub-directories like parts/part-name/src for each part that contains
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the downloaded content.
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The next step is that each part is build in its parts/part-name/build
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directory and installs itself into parts/part-name/install.
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After the build of each part the parts are combined into a single
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directory tree that is called the "staging area". It can be found
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under the ./stage directory.
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The snap step move the data into a ./snap directory. It contains only
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the content that will be put into the final snap package.
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The final step builds a snap package out of the snap directory.
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More details on the flow can be found in the docs/flow.md document.
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After introducing the key concept of snapcraft it is probably a good
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time to look at the tutorial in docs/tutorial.md to see how it works
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for an example project.
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