Fixes according review

Signed-off-by: Mykola Morhun <mmorhun@redhat.com>

README.md

@@ -134,7 +134,7 @@ USAGE
 
 OPTIONS
   -d, --destination=destination
-      [default: ~] Destination where to store Che certificate.
+      Destination where to store Che CA certificate.
                            If the destination is a file (might not exist), then the certificate will be saved there in PEM 
       format.
                            If the destination is a directory, then cheCA.crt file will be created there with Che 

src/api/che.ts

@@ -114,14 +114,14 @@ export class CheHelper {
   async retrieveEclipseCheCaCert(cheNamespace: string): Promise<string> {
     const cheCaSecret = await this.kube.getSecret(CHE_ROOT_CA_SECRET_NAME, cheNamespace)
     if (!cheCaSecret) {
-      throw new Error('Local Che CA self-signed certificate not found. Are you using self-signed certificate?')
+      throw new Error('Che CA self-signed certificate not found. Are you using self-signed certificate?')
     }
 
     if (cheCaSecret.data && cheCaSecret.data['ca.crt']) {
       return Buffer.from(cheCaSecret.data['ca.crt'], 'base64').toString('ascii')
     }
 
-    throw new Error(`Secret "${CHE_ROOT_CA_SECRET_NAME}" has invalid format.`)
+    throw new Error(`Secret "${CHE_ROOT_CA_SECRET_NAME}" has invalid format: "ca.crt" key not found in data.`)
   }
 
   async cheK8sURL(namespace = ''): Promise<string> {

src/commands/cacert/export.ts

@@ -36,12 +36,12 @@ export default class Export extends Command {
     }),
     destination: string({
       char: 'd',
-      description: `Destination where to store Che certificate.
+      description: `Destination where to store Che CA certificate.
                     If the destination is a file (might not exist), then the certificate will be saved there in PEM format.
                     If the destination is a directory, then ${DEFAULT_CA_CERT_FILE_NAME} file will be created there with Che certificate in PEM format.
                     If this option is ommited, then Che certificate will be stored in user's home directory as ${DEFAULT_CA_CERT_FILE_NAME}`,
       env: 'CHE_CA_CERT_LOCATION',
-      default: '~'
+      default: ''
     }),
   }
 
@@ -54,7 +54,7 @@ export default class Export extends Command {
     const apiTasks = new ApiTasks()
     const tasks = new Listr([], { renderer: 'silent' })
 
-    const targetFile = this.prepareTarget(flags.destination)
+    const targetFile = this.getTargetFile(flags.destination)
 
     tasks.add(platformTasks.preflightCheckTasks(flags, this))
     tasks.add(apiTasks.testApiTasks(flags, this))
@@ -73,16 +73,16 @@ export default class Export extends Command {
   /**
    * Handles certificate target location and returns string which points to the target file.
    */
-  private prepareTarget(destinaton: string): string {
-    if (destinaton === '~') {
+  private getTargetFile(destinaton: string): string {
+    if (!destinaton) {
       return path.join(os.homedir(), DEFAULT_CA_CERT_FILE_NAME)
     }
 
     if (fs.existsSync(destinaton)) {
       return fs.lstatSync(destinaton).isDirectory() ? path.join(destinaton, DEFAULT_CA_CERT_FILE_NAME) : destinaton
     }
 
-    throw new Error('Given certificate path doesn\'t exist.')
+    this.error(`Given path "${destinaton}" doesn\'t exist.`)
   }
 
 }