Allow increasing main storage size (sdcard is separate storage) (#219)

* Allow increasing disk size - Issue #184

* Fix checkDiskSize validator

* Fix lint errors

* Size modifier without a number is unacceptable

"G" is not the same as "1G"

* Implement checkDiskSize validator tests

src/input-validator.ts

@@ -69,3 +69,20 @@ export function checkEmulatorBuild(emulatorBuild: string): void {
 function isValidBoolean(value: string): boolean {
   return value === 'true' || value === 'false';
 }
+
+export function checkDiskSize(diskSize: string): void {
+  // Disk size can be empty - the default value
+  if (diskSize) {
+    // Can also be number of bytes
+    if (isNaN(Number(diskSize)) || !Number.isInteger(Number(diskSize))) {
+      // Disk size can have a size multiplier at the end K, M or G
+      const diskSizeUpperCase = diskSize.toUpperCase();
+      if (diskSizeUpperCase.endsWith('K') || diskSizeUpperCase.endsWith('M') || diskSizeUpperCase.endsWith('G')) {
+        const diskSizeNoModifier: string = diskSize.slice(0, -1);
+        if (0 == diskSizeNoModifier.length || isNaN(Number(diskSizeNoModifier)) || !Number.isInteger(Number(diskSizeNoModifier))) {
+          throw new Error(`Unexpected disk size: '${diskSize}'.`);
+        }
+      }
+    }
+  }
+}