Fix daemon startup latency issue by providing an option to skip snapshotter supported flag

Signed-off-by: Shubharanshu Mahapatra <[email protected]>

Author: Shubhranshu153

cmd/soci-snapshotter-grpc/main.go

@@ -125,8 +125,13 @@ func main() {
 		log.G(ctx).WithError(err).Fatal(err)
 	}
 
-	if err := service.Supported(*rootDir); err != nil {
-		log.G(ctx).WithError(err).Fatalf("snapshotter is not supported")
+	if !cfg.SkipCheckSnapshotterSupported {
+		if err := service.Supported(*rootDir); err != nil {
+			log.G(ctx).WithError(err).Fatalf("snapshotter is not supported")
+		}
+		log.G(ctx).Debug("snapshotter is supported")
+	} else {
+		log.G(ctx).Warn("skipped snapshotter is supported check")
 	}
 
 	// Create a gRPC server

config/config.go

@@ -69,6 +69,9 @@ type Config struct {
 
 	// MetadataStore is the type of the metadata store to use.
 	MetadataStore string `toml:"metadata_store" default:"db"`
+
+	// SkipCheckSnapshotterSupported is a flag to skip check for overlayfs support needed to confirm if SOCI can work
+	SkipCheckSnapshotterSupported bool `toml:"skip_check_snapshotter_supported"`
 }
 type configParser func(*Config)
 

config/config.toml

@@ -31,6 +31,7 @@ metrics_network="" # Uses default metrics network
 # no_prometheus=true # Defined above, can't be redeclared
 debug_address=""
 metadata_store="db"
+skip_check_snapshotter_supported=false
 
 [http]
 MaxRetries=0

docs/config.md

@@ -34,6 +34,7 @@ This set of variables must be at the top of your TOML file due to not belonging
 - `no_prometheus` — Defined [above](#configfsgofsconfig), cannot be redeclared.
 - `debug_address` (string) — Address where [go pprof](https://pkg.go.dev/net/http/pprof) server will listen. If empty, no logs will be emitted. Default: "".
 - `metadata_store` (string) — Metadata storage type. Only "db" is valid. Default: "db".
+- `skip_check_snapshotter_supported` (bool) - skip check for snapshotter is supported which can give performance benefits for SOCI daemon startup time. This config should only be done if you are sure overlayfs is supported. Default: false
 
 #