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tvl-depot/tvix/nar-bridge
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Florian Klink c04041a001 feat(tvix/nar-bridge): add nar-bridge-pathinfo command 
This adds an additional nar-bridge-pathinfo command.

It exposes a PathInfoService for a HTTP Binary Cache, ingesting data
into a BlobService/DirectoryService as it goes through the NAR file.

It does this whenever it receives a Get request for a specific output
path, and waits returning with the PathInfo response until it ingested
the data.
It does not do any sort of caching - this means it re-downloads NAR
files again whenever the PathInfo is requested again, so you most likely
do not want to use this currently.

It's one building component as soon as we have store composition (which
we currently don't, so don't use this).

It can be used as an alternative mechanism to ingest data (Blobs and
Directories) of a given store path from a binary cache into tvix-store.

```
❯ nix-build -A third_party.nixpkgs.hello
/nix/store/mdi7lvrn2mx7rfzv3fdq3v5yw8swiks6-hello-2.12.1

❯ nix hash to-sri --type sha1 mdi7lvrn2mx7rfzv3fdq3v5yw8swiks6
sha1-Rs/INeK+7IGbG/u7fHoVNm96Yqs=

❯ out=$(mg build //tvix/nar-bridge)
$out/bin/nar-bridge-pathinfo --log-level debug &
INFO[0000] Starting nar-bridge-pathinfosvc at [::]:8001

❯ mg run //tvix:store -- daemon &
[mg] building target //tvix:store
[mg] running target //tvix:store
  2023-10-03T16:21:57.433739Z  INFO tvix_store: tvix-store listening on [::]:8000
    at src/bin/tvix-store.rs:229

❯ evans --host localhost --port 8001 -r repl
[…]
tvix.store.v1.PathInfoService@localhost:8001> call Get
✔ by_output_hash
by_output_hash (TYPE_BYTES) => Rs/INeK+7IGbG/u7fHoVNm96Yqs=
{
  "narinfo": {
    "narSha256": "sXrPtjqhSoc2u0YfM1HVZThknkSYuRuHdtKCB6wkDFo=",
    "narSize": "226552",
    "referenceNames": [
      "aw2fw9ag10wr9pf0qk4nk5sxi0q0bn56-glibc-2.37-8",
      "mdi7lvrn2mx7rfzv3fdq3v5yw8swiks6-hello-2.12.1"
    ],
    "signatures": [
      {
        "data": "7guDbfaF2Q29HY0c5axhtuacfxN6uxuEqeUfncDiSvMSAWvfHVMppB89ILqV8FE58pEQ04tSbMnRhR3FGPV0AA==",
        "name": "cache.nixos.org-1"
      }
    ]
  },
  "node": {
    "directory": {
      "digest": "xvo6BYbYaDw76IibLu5sr+VZoj9iM0ET2RUuYSYLwKE=",
      "name": "bWRpN2x2cm4ybXg3cmZ6djNmZHEzdjV5dzhzd2lrczYtaGVsbG8tMi4xMi4x",
      "size": 141
    }
  },
  "references": [
    "ptgFMIhdl2nJxMDdlDkITyXuBFc=",
    "Rs/INeK+7IGbG/u7fHoVNm96Yqs="
  ]
}
```

Change-Id: I50167d0ac081c91adf5cf2733bbc4dc0993bd46e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9539
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Reviewed-by: Brian Olsen <me@griff.name>
2023-10-05 15:02:12 +00:00
..
cmd feat(tvix/nar-bridge): add nar-bridge-pathinfo command 2023-10-05 15:02:12 +00:00
pkg feat(tvix/nar-bridge): add nar-bridge-pathinfo command 2023-10-05 15:02:12 +00:00
testdata fix(tvix/nar-bridge): Fix directory stack tracking 2023-09-17 13:34:00 +00:00
.gitignore feat(tvix/nar-bridge): add nar-bridge-pathinfo command 2023-10-05 15:02:12 +00:00
default.nix feat(tvix/nar-bridge): add nar-bridge-pathinfo command 2023-10-05 15:02:12 +00:00
go.mod feat(tvix/nar-bridge): add nar-bridge-pathinfo command 2023-10-05 15:02:12 +00:00
go.sum feat(tvix/nar-bridge): add nar-bridge-pathinfo command 2023-10-05 15:02:12 +00:00
README.md feat(tvix/nar-bridge): init 2023-09-17 13:24:53 +00:00

README.md

//tvix/nar-bridge

This exposes a HTTP Binary cache interface (GET/HEAD/PUT requests) for a tvix- store.

It can be used to configure a tvix-store as a substitutor for Nix, or to upload store paths from Nix via nix copy into a tvix-store.