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feat(tvix/composition): allow urls as anonymous stores

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This allows specifying an url in place of a named reference to another
composition entry, if the castore crate has been compiled with the
 xp-store-composition feature.

Example: `--directory-service-addr cache://?near=memory://&far=memory://`

This would be equivalent to the instantiation via toml file:

```toml
[memory1]
type = "memory"

[memory2]
type = "memory"

[default]
type = "cache"
near = "memory1"
far = "memory2"
```

Note that each anonymous url causes a distinct instance to be created.

Change-Id: Iee5a07a94b063b5e767c704d9cad0114fa843164
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12146
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
This commit is contained in:
Yureka 2024-08-07 16:50:38 +02:00 • committed by yuka
parent ba4e02c3ac
commit 52bb3c6d02
9 changed files with 151 additions and 91 deletions
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5
tvix/castore/Cargo.toml
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@ -91,6 +91,11 @@ virtiofs = [
]
fuse = ["fs"]
tonic-reflection = ["dep:tonic-reflection"]
# It's already possible for other crates to build a
# fully fledged store composition system based on castore composition.
# However, this feature enables anonymous url syntax which might
# inherently expose arbitrary composition possibilities to the user.
xp-store-composition = []
# Whether to run the integration tests.
# Requires the following packages in $PATH:
# cbtemulator, google-cloud-bigtable-tool