[feat] add mirror registry list to support private(insecure) registry

Signed-off-by: Yifan Yuan <tuji.yyf@alibaba-inc.com>

docs/QUICKSTART.md

@@ -67,7 +67,17 @@ The config file is `/etc/overlaybd-snapshotter/config.json`. Please create the f
         "enable": false,
         "uriPrefix": "/metrics",
         "port": 9863
-    }
+    },
+    "mirrorRegistry": [
+        {
+            "host": "localhost:5000",
+            "insecure": true
+        },
+        {
+            "host": "registry-1.docker.io",
+            "insecure": false
+        }
+    ]
 }
 ```
 | Field | Description |
@@ -81,6 +91,9 @@ The config file is `/etc/overlaybd-snapshotter/config.json`. Please create the f
 | `exporterConfig.enable` | whether or not create a server to show Prometheus metrics |
 | `exporterConfig.uriPrefix` | URI prefix for export metrics, default `/metrics` |
 | `exporterConfig.port` | port for http server to show metrics, default `9863` |
+| `mirrorRegistry` | an arrary of mirror registries |
+| `mirrorRegistry.host` | host address, eg. `registry-1.docker.io`` |
+| `mirrorRegistry.insecure` | `true` or `false` |
 
 
 #### Start service

pkg/snapshot/overlay.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/containerd/accelerated-container-image/pkg/label"
 	"github.com/containerd/accelerated-container-image/pkg/metrics"
+	"github.com/sirupsen/logrus"
 
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/log"
@@ -66,6 +67,11 @@ const (
 	RwDev = "dev"       // use overlaybd directly
 )
 
+type Registry struct {
+	Host     string `json:"host"`
+	Insecure bool   `json:"insecure"`
+}
+
 type BootConfig struct {
 	Address           string                 `json:"address"`
 	Root              string                 `json:"root"`
@@ -75,6 +81,7 @@ type BootConfig struct {
 	AutoRemoveDev     bool                   `json:"autoRemoveDev"`
 	ExporterConfig    metrics.ExporterConfig `json:"exporterConfig"`
 	WritableLayerType string                 `json:"writableLayerType"` // append or sparse
+	MirrorRegistry    []Registry             `json:"mirrorRegistry"`
 }
 
 func DefaultBootConfig() *BootConfig {
@@ -88,6 +95,7 @@ func DefaultBootConfig() *BootConfig {
 			UriPrefix: "/metrics",
 			Port:      9863,
 		},
+		MirrorRegistry:    nil,
 		WritableLayerType: "append",
 	}
 }
@@ -153,6 +161,7 @@ type snapshotter struct {
 	indexOff          bool
 	autoRemoveDev     bool
 	writableLayerType string
+	mirrorRegistry    []Registry
 
 	locker *locker.Locker
 }
@@ -190,6 +199,10 @@ func NewSnapshotter(bootConfig *BootConfig, opts ...Opt) (snapshots.Snapshotter,
 		indexOff = true
 	}
 
+	if bootConfig.MirrorRegistry != nil {
+		logrus.Infof("mirror Registry: %+v", bootConfig.MirrorRegistry)
+	}
+
 	return &snapshotter{
 		root:              bootConfig.Root,
 		rwMode:            bootConfig.RwMode,
@@ -199,6 +212,7 @@ func NewSnapshotter(bootConfig *BootConfig, opts ...Opt) (snapshots.Snapshotter,
 		metacopyOption:    metacopyOption,
 		autoRemoveDev:     bootConfig.AutoRemoveDev,
 		writableLayerType: bootConfig.WritableLayerType,
+		mirrorRegistry:    bootConfig.MirrorRegistry,
 		locker:            locker.New(),
 	}, nil
 }

pkg/snapshot/storage.go

@@ -634,7 +634,13 @@ func (o *snapshotter) constructImageBlobURL(ref string) (string, error) {
 	if host == "docker.io" {
 		host = "registry-1.docker.io"
 	}
-	return "https://" + path.Join(host, "v2", repo) + "/blobs", nil
+	scheme := "https://"
+	for _, reg := range o.mirrorRegistry {
+		if host == reg.Host && reg.Insecure {
+			scheme = "http://"
+		}
+	}
+	return scheme + path.Join(host, "v2", repo) + "/blobs", nil
 }
 
 // atomicWriteOverlaybdTargetConfig

script/config.json

@@ -4,5 +4,6 @@
     "verbose": "info",
     "rwMode": "overlayfs",
     "logReportCaller": false,
-    "autoRemoveDev": false
-}
+    "autoRemoveDev": false,
+    "mirrorRegistry": []
+}