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Hi all, This is a write up of a discussion which happened at the Manchester gathering after originally being raised at [1]. If we wish bst to follow the principle of least surprise, we should minimize the number of operations performed implicitly when invoking bst commands. To this end, it is proposed here that we change the default behaviour of bst commands such that sources are not fetched unless this is explicitly requested. Note that as this proposal would alter BuildStream's cli, any implementation should be completed prior to the 1.4 release.
Current Behaviour ------------------------------ Currently BuildStream will automatically fetch sources which are not cached when running the following bst commands: - workspace open - workspace reset - source-bundle - shell (with --build option) - build The exception to the above is junction elements, which are fetched at load time by build, fetch, track, pull, push and checkout. Proposed Behaviour --------------------------------- Only `bst build` should fetch sources by default. There is an option like --fetch for the remaining commands. These should only fetch elements if this option is present. If unfetched sources are required and the --fetch flag is not given, the command should should fail and recommend the user run a bst fetch command or the repeat the command with the --fetch option. Alternatively, if running in interactive mode, the user should be presented with the
option to fetch, continue, quit etc. Best regards, Phil
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