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authorFlorian Klink <flokli@flokli.de>2024-04-22T11·02+0300
committerclbot <clbot@tvl.fyi>2024-04-23T12·30+0000
commit091de12a9a735e71c119e543dab9f2999a36a5a1 (patch)
tree8df65d32934e026cec80256226da031954f715c1 /.nixery
parentdc444e55dcb75a634bce94fef9e29d90ea90fe5f (diff)
refactor(tvix/glue): move Fetch[er] into its own types, fetch lazily r/7993
We actually want to delay fetching until we actually need the file. A
simple evaluation asking for `.outPath` or `.drvPath` should work even
in a pure offline environment.

Before this CL, the fetching logic was quite distributed between
tvix_store_io, and builtins/fetchers.rs.

Rather than having various functions and conversions between structs,
describe a Fetch as an enum type, with the fields describing the fetch.

Define a store_path() function on top of `Fetch` which can be used to
ask for the calculated store path (if the digest has been provided
upfront).

Have a `Fetcher` struct, and give it a `fetch_and_persist` function,
taking a `Fetch` as well as a desired name, and have it deal with all
the logic of persisting the PathInfos. It also returns a StorePathRef,
similar to the `.store_path()` method on a `Fetch` struct.

In a followup CL, we can extend KnownPaths to track fetches AND
derivations, and then use `Fetcher` when we need to do IO into that
store path.

Change-Id: Ib39a96baeb661750a8706b461f8ba4abb342e777
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11500
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Diffstat (limited to '.nixery')
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