samples: environment setup twice error. (#213)

Author: Arakel2811

retail/interactive-tutorials/user_environment_setup.sh

@@ -37,20 +37,46 @@ project_id=$1
 echo "Project ID: $project_id"
 gcloud config set project "$project_id"
 
-timestamp=$(date +%s)
-service_account_id="service-acc-$timestamp"
-echo "Service Account: $service_account_id"
-# create service account (your service-acc-$timestamp)
-gcloud iam service-accounts create "$service_account_id"
+email=$(gcloud auth list --filter="status:ACTIVE account:$project_id.iam.gserviceaccount.com" --format="value(account)")
+echo $email
 
-# assign necessary roles to your new service account
-for role in {retail.admin,editor}
-do
-    gcloud projects add-iam-policy-binding "$project_id" --member="serviceAccount:$service_account_id@$project_id.iam.gserviceaccount.com" --role=roles/"${role}"
-done
+# check if user has service account active
+if [ -z "$email" ]
+then
+    # create a new service account
+    timestamp=$(date +%s)
+    service_account_id="service-acc-$timestamp"
+    echo "Service Account: $service_account_id"
+    gcloud iam service-accounts create "$service_account_id"
+else
+    service_account_id="${email%@*}"
+    # log out of service account
+    gcloud auth revoke 2>/dev/null
+fi
+echo "$service_account_id"
+
+editor=$(gcloud projects get-iam-policy $project_id  \
+--flatten="bindings[].members" \
+--format='table(bindings.role)' \
+--filter="bindings.members:$service_account_id ROLE=roles/editor")
+
+retail_admin=$(gcloud projects get-iam-policy $project_id  \
+--flatten="bindings[].members" \
+--format='table(bindings.role)' \
+--filter="bindings.members:$service_account_id ROLE=roles/retail.admin")
+
+# check if any of the needed roles is missing
+if [ -z "$editor" ] || [ -z "$retail_admin" ]
+then
+    # assign necessary roles to your new service account.
+    for role in {retail.admin,editor}
+    do
+        gcloud projects add-iam-policy-binding "$project_id" --member="serviceAccount:$service_account_id@$project_id.iam.gserviceaccount.com" --role=roles/"${role}"
+    done
+    echo "Wait ~60 seconds to be sure the appropriate roles have been assigned to your service account"
+    sleep 60
+fi
 
-echo "Wait ~60 seconds to be sure the appropriate roles have been assigned to your service account"
-sleep 60
 # upload your service account key file
 service_acc_email="$service_account_id@$project_id.iam.gserviceaccount.com"
 gcloud iam service-accounts keys create ~/key.json --iam-account "$service_acc_email"