feat(vfs): in-memory virtual filesystem + state integration#371
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davydog187 wants to merge 1 commit into
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feat(vfs): in-memory virtual filesystem + state integration#371davydog187 wants to merge 1 commit into
davydog187 wants to merge 1 commit into
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Add Lua.VFS, a flat-map in-memory filesystem keyed by normalized absolute path, with tagged-tuple errors (:enoent/:eisdir/:einval) that map onto Lua's nil/message/errno io/os contract. Seed it on Lua.VM.State (new/0) and thread it through vfs_read/2, vfs_write/3, vfs_rm/2, vfs_exists?/2. Add update_userdata/3 for mutable userdata (forthcoming io file-handle cursors). Foundation for virtual-by-default execution; no behavior change yet.
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Virtual-by-default, PR 1/4 — foundation
First slice of the 1.0.0 virtual-by-default work (tracking: #297; supersedes the draft #302). No behavior change — this only adds the storage layer the later PRs route through.
What
Lua.VFS— a vendored, in-memory virtual filesystem: a flat map keyed by normalized absolute path, directories implicit, with tagged-tuple errors (:enoent/:eisdir/:einval) that map onto Lua'snil, message, errnoio/os contract. No external dependency (keeps the Elixir floor at~> 1.16andmix hex.publishclean — unlike feat(stdlib): route os/require file IO through a virtual filesystem #302'sivarvong/vfsgit dep).Lua.VM.State—vfsfield seeded innew/0; threaded helpersvfs_read/2,vfs_write/3,vfs_rm/2,vfs_exists?/2; plusupdate_userdata/3for the mutable file-handle cursors coming in the io PR.Why this shape
A git dependency blocks
mix hex.publishand bumps the Elixir floor; the surface actually needed is tiny (read/write/rm/exists over one in-memory tree), so it's vendored in-tree where the security boundary belongs.Next in the stack
sandbox:/env:API + Os.Common/Virtual/Host split + virtual/host loaders (removes the per-path deny-list)io.*virtualization over the VFSVerification
mix test: 2588 passed (+24 new), 0 failuresmix format+mix compile --warnings-as-errors: clean