ciao-cli: Add tenant name evironment variable

When user is part of more than one project (tenant), it
allows to use environment variables for passing the proper
project name instead of using the ``tenant-name`` or ``tenant-id``
parameters in ``ciao-cli`` command. It would verify if the
``CIAO_TENANT_NAME`` environment variable exists, it would use it;
if not, everything would normally proceed.

Signed-off-by: Munoz, Obed N <[email protected]>

ciao-cli/README.md

@@ -69,6 +69,7 @@ credentials and networking information:
 * `CIAO_COMPUTEPORT` exports the Ciao compute alternative port
 * `CIAO_USERNAME` exports the Ciao username
 * `CIAO_PASSWORD` export the Ciao password for `CIAO_USERNAME`
+* `CIAO_TENANT_NAME` export the Ciao tenant name for `CIAO_USERNAME`
 
 All those environment variables can be set through an rc file.
 For example:
@@ -80,6 +81,7 @@ export CIAO_CONTROLLER=ciao-ctl.intel.com
 export CIAO_IDENTITY=https://ciao-identity.intel.com:35357
 export CIAO_USERNAME=user
 export CIAO_PASSWORD=ciaouser
+export CIAO_TENANT_NAME=admin
 ```
 
 Exporting those variables is not compulsory and they can be defined
@@ -146,6 +148,7 @@ Let's assume we're running a Ciao cluster with the following settings:
 * The `user` user is part of only one project: `project1`
 * The password for `user` is `ciaouser`
 * `project1` UUID is `68a76514-5c8e-40a8-8c9e-0570a11d035b`
+*
 
 This can be defined through the following Ciao rc file:
 
@@ -156,6 +159,7 @@ export CIAO_CONTROLLER=ciao-ctl.intel.com
 export CIAO_IDENTITY=https://ciao-identity.intel.com:35357
 export CIAO_USERNAME=user
 export CIAO_PASSWORD=ciaouser
+export CIAO_TENANT_NAME=project1
 ```
 
 ### Cluster status (Privileged)

ciao-cli/main.go

@@ -136,6 +136,7 @@ const (
 	ciaoUsernameEnv    = "CIAO_USERNAME"
 	ciaoPasswordEnv    = "CIAO_PASSWORD"
 	ciaoComputePortEnv = "CIAO_COMPUTEPORT"
+	ciaoTenantNameEnv  = "CIAO_TENANT_NAME"
 )
 
 type queryValue struct {
@@ -262,13 +263,15 @@ func getCiaoEnvVariables() {
 	username := os.Getenv(ciaoUsernameEnv)
 	password := os.Getenv(ciaoPasswordEnv)
 	port := os.Getenv(ciaoComputePortEnv)
+	tenant := os.Getenv(ciaoTenantNameEnv)
 
 	infof("Ciao environment variables:\n")
 	infof("\t%s:%s\n", ciaoIdentityEnv, identity)
 	infof("\t%s:%s\n", ciaoControllerEnv, controller)
 	infof("\t%s:%s\n", ciaoUsernameEnv, username)
 	infof("\t%s:%s\n", ciaoPasswordEnv, password)
 	infof("\t%s:%s\n", ciaoComputePortEnv, port)
+	infof("\t%s:%s\n", ciaoTenantNameEnv, tenantName)
 
 	if identity != "" && *identityURL == "" {
 		*identityURL = identity
@@ -290,6 +293,9 @@ func getCiaoEnvVariables() {
 		*computePort, _ = strconv.Atoi(port)
 	}
 
+	if tenant != "" && *tenantName == "" {
+		*tenantName = tenant
+	}
 }
 
 func checkCompulsoryOptions() {