docker ECR login (go-aws-sdk)

app/modules/aws_ledo/ecr_login.go

@@ -0,0 +1,36 @@
+package aws_ledo
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/ecr"
+	"os"
+)
+
+func getRegion() string {
+	region, exists := os.LookupEnv("AWS_REGION")
+	if !exists {
+		fmt.Printf("AWS_REGION not set and unable to fetch region")
+		os.Exit(1)
+	}
+	return region
+}
+
+func EcrLogin() (*ecr.GetAuthorizationTokenOutput, error) {
+	var input *ecr.GetAuthorizationTokenInput
+	var token *ecr.GetAuthorizationTokenOutput
+
+	config := &aws.Config{
+    	Region:      aws.String(getRegion()),
+	}
+	sess, _ := session.NewSession(config)
+	_, err := sess.Config.Credentials.Get()
+		if err != nil {
+		return token, err
+	}
+
+	ecrCtx := ecr.New(sess)
+	token, err = ecrCtx.GetAuthorizationToken(input)
+	return token, nil
+}

app/modules/context/context.go

@@ -81,3 +81,11 @@ func (lx *LedoContext) ExecCmd(cmd string, cmdArgs []string) error {
 	command.Stderr = os.Stderr
 	return command.Run()
 }
+
+func (lx *LedoContext) ExecCmdSilent(cmd string, cmdArgs []string) error {
+	command := exec.Command(cmd, cmdArgs...)
+	command.Stdin = os.Stdin
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+	return command.Run()
+}

app/modules/docker/login.go

@@ -0,0 +1,40 @@
+package docker
+
+import (
+	b64 "encoding/base64"
+	"fmt"
+	"ledo/app/modules/aws_ledo"
+	"ledo/app/modules/context"
+	"net/url"
+	"os"
+)
+
+func trimLeftChars(s string, n int) string {
+    m := 0
+    for i := range s {
+        if m >= n {
+            return s[i:]
+        }
+        m++
+    }
+    return s[:0]
+}
+
+func DockerEcrLogin(ctx *context.LedoContext) error {
+	ecr, err := aws_ledo.EcrLogin()
+	if err != nil {
+		fmt.Println("Ecr login error: %s", err)
+		os.Exit(1)
+	}
+	password := *ecr.AuthorizationData[0].AuthorizationToken
+	ecrUrl := *ecr.AuthorizationData[0].ProxyEndpoint
+	sDec, _ := b64.StdEncoding.DecodeString(password)
+	registryAddr, err := url.Parse(ecrUrl)
+	if err != nil {
+		fmt.Printf("Ecr endpoint addr parse error: %s", err)
+		os.Exit(1)
+	}
+	ctx.ExecCmdSilent("docker", []string{"login", "-u", "AWS", "-p", string(trimLeftChars(string(sDec), 4)), registryAddr.Host})
+
+	return nil
+}