Make init accept a list of images not just a single one.

fix #1527

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

examples/docker.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 console=tty0 page_poison=1"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

examples/gcp.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 page_poison=1"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

examples/sshd.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 page_poison=1"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

examples/vmware.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=tty0 page_poison=1"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

moby.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 console=tty0 page_poison=1"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/demo/etcd/etcd.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 console=tty0 page_poison=1"
-init: "mobylinux/init:a27e32a8d6c8865d691fbfb4d0bbb93846cf7802"
+init:
+  - "mobylinux/init:a27e32a8d6c8865d691fbfb4d0bbb93846cf7802"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/demo/intro/intro.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 console=tty0 page_poison=1"
-init: "mobylinux/init:a27e32a8d6c8865d691fbfb4d0bbb93846cf7802"
+init:
+  - "mobylinux/init:a27e32a8d6c8865d691fbfb4d0bbb93846cf7802"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/kubernetes/kube-master.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 console=tty0 page_poison=1"
-init: "mobylinux/init:c0007f0cdf1ef821a981fcc676e3f1c2dd9ab5b1"
+init:
+  - "mobylinux/init:c0007f0cdf1ef821a981fcc676e3f1c2dd9ab5b1"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/miragesdk/examples/mirage-dhcp.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 page_poison=1"
-init: "mobylinux/init:9d755f7e7d108d523448e4a503f1613b7d870389@sha256:9ccb16f2d8b3a09d12f5459106763f1836c064e420a13360e2e25599337960dc"
+init:
+  - "mobylinux/init:9d755f7e7d108d523448e4a503f1613b7d870389@sha256:9ccb16f2d8b3a09d12f5459106763f1836c064e420a13360e2e25599337960dc"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/selinux/selinux.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel-selinux:4.9.x"
   cmdline: "console=ttyS0 page_poison=1 security=selinux selinux=1"
-init: "mobylinux/init:b5249a412536b4e69f8e1f668680d2ae185cc505"
+init:
+  - "mobylinux/init:b5249a412536b4e69f8e1f668680d2ae185cc505"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/swarmd/swarmd.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 console=tty0 page_poison=1"
-init: "mobylinux/init:c0007f0cdf1ef821a981fcc676e3f1c2dd9ab5b1"
+init:
+  - "mobylinux/init:c0007f0cdf1ef821a981fcc676e3f1c2dd9ab5b1"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

projects/wireguard/examples/wireguard.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel-wireguard:4.9.x"
   cmdline: "console=ttyS0 page_poison=1"
-init: "mobylinux/init-wireguard:4309fb8b65cafa9e07b0e75d86a0bff4070e67e9"
+init:
+  - "mobylinux/init-wireguard:4309fb8b65cafa9e07b0e75d86a0bff4070e67e9"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"

src/cmd/moby/build.go

@@ -97,21 +97,24 @@ func buildInternal(name string, pull bool, conf string) {
 	}
 	initrdAppend(iw, ktar)
 
-	// convert init image to tarball
-	if pull {
-		log.Infof("Pull init: %s", m.Init)
-		err := dockerPull(m.Init)
-		if err != nil {
-			log.Fatalf("Could not pull image %s: %v", m.Init, err)
+	// convert init images to tarballs
+	log.Infof("Add init containers:")
+	for _, ii := range m.Init {
+		if pull {
+			log.Infof("Pull init image: %s", ii)
+			err := dockerPull(ii)
+			if err != nil {
+				log.Fatalf("Could not pull image %s: %v", ii, err)
+			}
 		}
+		log.Infof("Process init image: %s", ii)
+		init, err := ImageExtract(ii, "")
+		if err != nil {
+			log.Fatalf("Failed to build init tarball from %s: %v", ii, err)
+		}
+		buffer := bytes.NewBuffer(init)
+		initrdAppend(iw, buffer)
 	}
-	log.Infof("Process init: %s", m.Init)
-	init, err := ImageExtract(m.Init, "")
-	if err != nil {
-		log.Fatalf("Failed to build init tarball: %v", err)
-	}
-	buffer := bytes.NewBuffer(init)
-	initrdAppend(iw, buffer)
 
 	log.Infof("Add system containers:")
 	for i, image := range m.System {
@@ -161,7 +164,7 @@ func buildInternal(name string, pull bool, conf string) {
 	}
 
 	// add files
-	buffer, err = filesystem(m)
+	buffer, err := filesystem(m)
 	if err != nil {
 		log.Fatalf("failed to add filesystem parts: %v", err)
 	}

src/cmd/moby/config.go

@@ -24,7 +24,7 @@ type Moby struct {
 		Image   string
 		Cmdline string
 	}
-	Init   string
+	Init   []string
 	System []MobyImage
 	Daemon []MobyImage
 	Files  []struct {

test/ltp/test-ltp.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: ltp
     image: "mobylinux/test-ltp-20170116:fdca2d1bb019b1d51e722e6032c82c7933d4b870"

test/test.yml

@@ -1,7 +1,8 @@
 kernel:
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: binfmt
     image: "mobylinux/binfmt:bdb754f25a5d851b4f5f8d185a43dfcbb3c22d01"

test/virtsock/test-virtsock-server.yml

@@ -5,7 +5,8 @@ kernel:
   # image: "mobylinux/kernel:4.9.14-0"
   image: "mobylinux/kernel:4.9.x"
   cmdline: "console=ttyS0 page_poison=1"
-init: "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
+init:
+  - "mobylinux/init:7a17035030dca3938947516241f51d28922cebb2"
 system:
   - name: sysctl
     image: "mobylinux/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"