feat(tvix/nar-bridge): do pathInfo.Validate() as additional check r/6719

This should make it quite quick to spot writing code breaking some of
the assumptions we have on PathInfo messages ourselves.

Change-Id: I480caaec41f8ea5246c3c3081460c7ad12e78569
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9554
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>

4 files changed, 20 insertions, 9 deletions

diff --git a/tvix/nar-bridge/default.nix b/tvix/nar-bridge/default.nix
index 6e7468bf88..d8688730dd 100644
--- a/tvix/nar-bridge/default.nix
+++ b/tvix/nar-bridge/default.nix
@@ -6,5 +6,5 @@ pkgs.buildGoModule {
   name = "nar-bridge";
   src = depot.third_party.gitignoreSource ./.;
 
-  vendorHash = "sha256-DiGK6Lb+DA46zjJUZpkMSecF3cVst7KoGhcLG3OxtOc=";
+  vendorHash = "sha256-PlmFiGQPHqc+4JG0HAWW+oj8ruL7PTmGNJe20ansrxg=";
 }
diff --git a/tvix/nar-bridge/go.mod b/tvix/nar-bridge/go.mod
index 628ceb8026..3fa9d56845 100644
--- a/tvix/nar-bridge/go.mod
+++ b/tvix/nar-bridge/go.mod
@@ -2,14 +2,16 @@ module code.tvl.fyi/tvix/nar-bridge
 
 require (
 	code.tvl.fyi/tvix/castore/protos v0.0.0-20230922125121-72355662d742
-	code.tvl.fyi/tvix/store/protos v0.0.0-20230922125121-4251671e09c1
+	code.tvl.fyi/tvix/store/protos v0.0.0-20231005184258-5be346d3c195
 	github.com/alecthomas/kong v0.7.1
 	github.com/go-chi/chi v1.5.4
 	github.com/go-chi/chi/v5 v5.0.7
 	github.com/google/go-cmp v0.5.9
+	github.com/multiformats/go-multihash v0.2.1
 	github.com/nix-community/go-nix v0.0.0-20231005143722-b0f8b73c06df
 	github.com/sirupsen/logrus v1.9.0
 	github.com/stretchr/testify v1.8.1
+	github.com/ulikunitz/xz v0.5.11
 	google.golang.org/grpc v1.51.0
 	google.golang.org/protobuf v1.28.1
 	lukechampine.com/blake3 v1.1.7
@@ -21,11 +23,9 @@ require (
 	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
 	github.com/minio/sha256-simd v1.0.0 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect
-	github.com/multiformats/go-multihash v0.2.1 // indirect
 	github.com/multiformats/go-varint v0.0.6 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
-	github.com/ulikunitz/xz v0.5.11 // indirect
 	golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect
 	golang.org/x/net v0.7.0 // indirect
 	golang.org/x/sys v0.5.0 // indirect
diff --git a/tvix/nar-bridge/go.sum b/tvix/nar-bridge/go.sum
index 36b12c077d..286978ea12 100644
--- a/tvix/nar-bridge/go.sum
+++ b/tvix/nar-bridge/go.sum
@@ -1,8 +1,8 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 code.tvl.fyi/tvix/castore/protos v0.0.0-20230922125121-72355662d742 h1:x7LsxggggaN3acnCMNDO5LZLAV+A+rZ+R8TXzr+Lgsk=
 code.tvl.fyi/tvix/castore/protos v0.0.0-20230922125121-72355662d742/go.mod h1:Ejhyvc0dJUWQMxtJxddfFuAF5N8IKIO94q5CP4czY8Y=
-code.tvl.fyi/tvix/store/protos v0.0.0-20230922125121-4251671e09c1 h1:ttMO8cE4rVbqJlqLsoirePWEtXhT4MxrGvLMFyJ+UhA=
-code.tvl.fyi/tvix/store/protos v0.0.0-20230922125121-4251671e09c1/go.mod h1:uOGlmwyEraDd9kzAWHdDeZdNgKrpOAmtWCdMeY+DVKs=
+code.tvl.fyi/tvix/store/protos v0.0.0-20231005184258-5be346d3c195 h1:Phbmz5mjc2D5EYmiZy12l6yoh4NwZVWUg9eqsfJBJO0=
+code.tvl.fyi/tvix/store/protos v0.0.0-20231005184258-5be346d3c195/go.mod h1:wY+2UywCYumr2lKLN8H+J/PvczD0mmsnU2dqotIxeLo=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/alecthomas/assert/v2 v2.1.0 h1:tbredtNcQnoSd3QBhQWI7QZ3XHOVkw1Moklp2ojoH/0=
 github.com/alecthomas/kong v0.7.1 h1:azoTh0IOfwlAX3qN9sHWTxACE2oV8Bg2gAwBsMwDQY4=
@@ -51,11 +51,8 @@ github.com/multiformats/go-multihash v0.2.1 h1:aem8ZT0VA2nCHHk7bPJ1BjUbHNciqZC/d
 github.com/multiformats/go-multihash v0.2.1/go.mod h1:WxoMcYG85AZVQUyRyo9s4wULvW5qrI9vb2Lt6evduFc=
 github.com/multiformats/go-varint v0.0.6 h1:gk85QWKxh3TazbLxED/NlDVv8+q+ReFJk7Y2W/KhfNY=
 github.com/multiformats/go-varint v0.0.6/go.mod h1:3Ls8CIEsrijN6+B7PbrXRPxHRPuXSrVKRY101jdMZYE=
-github.com/nix-community/go-nix v0.0.0-20230825195510-c72199eca18e h1:15CPg2PQMyBl+TTEKuonrQqS9uOJyi7JcuU0FpvV088=
-github.com/nix-community/go-nix v0.0.0-20230825195510-c72199eca18e/go.mod h1:y3eASc0gMh26jjoP9Xz+qqMKjTnqJgG1RG8xvKvFR8s=
 github.com/nix-community/go-nix v0.0.0-20231005143722-b0f8b73c06df h1:n4I26uXUST5vmdsDWPo9ikK57il4htQyhnsLWoHYFmY=
 github.com/nix-community/go-nix v0.0.0-20231005143722-b0f8b73c06df/go.mod h1:hHM9UK2zOCjvmiLgeaW4LVbOW/vBaRWFJGzfi31/slQ=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
diff --git a/tvix/nar-bridge/pkg/pathinfosvc/server.go b/tvix/nar-bridge/pkg/pathinfosvc/server.go
index 464ca6f61b..d5074a2f32 100644
--- a/tvix/nar-bridge/pkg/pathinfosvc/server.go
+++ b/tvix/nar-bridge/pkg/pathinfosvc/server.go
@@ -264,6 +264,20 @@ func (p *PathInfoServiceServer) Get(ctx context.Context, getPathInfoRequest *sto
 		panic("node may not be nil")
 	}
 
+	// run Validate on the PathInfo, more as an additional sanity check our code is sound,
+	// to make sure we populated everything properly, before returning it.
+	validatedOutPath, err := pathInfo.Validate()
+	if err != nil {
+		panic("pathinfo failed validation")
+	}
+	if narInfo.StorePath != validatedOutPath.Absolute() {
+		panic(fmt.Sprintf(
+			"StorePath returned from Validate() mismatches the one from .narinfo (%s vs %s)",
+			validatedOutPath.Absolute(),
+			narInfo.StorePath),
+		)
+	}
+
 	return pathInfo, nil
 
 	// TODO: Deriver, System, CA