fsgofer: add extension prepare hooks#13223
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Custom fsgofer extensions may need to prepare state before the gofer drops capabilities and enters its final root. For example, an extension may need to register gofer flags, open resources, and pass file descriptor numbers through the gofer re-exec path. Allow extensions to optionally define SetFlags and PrepareGofer methods. SetFlags can add gofer flags during command setup. PrepareGofer runs after root setup and before capability application; its FlagOverrides are merged into the arguments used for gofer re-exec. This keeps the base Extension interface focused on mount handling while allowing extensions that need early preparation to opt in. No behavior changes when no registered extension defines these optional methods.
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Custom fsgofer extensions may need to prepare state before the gofer drops capabilities and enters its final root. For example, an extension may need to register gofer flags, open resources, and pass file descriptor numbers through the gofer re-exec path.
This is a proposal to allow extensions to optionally define
SetFlagsandPrepareGofermethods.SetFlagscan add gofer flags during command setup.PrepareGoferruns after root setup and before capability application and itsFlagOverridesare merged into the arguments used for gofer re-exec.This keeps the base Extension interface focused on mount handling while allowing extensions that need early preparation to opt in. No behavior changes when no registered extension defines these optional methods.
Related: #12950