If app.dataDir is set, first unmount from sftp before deleting on uninstall

src/sftp.js

@@ -19,12 +19,16 @@ function startSftp(existingInfra, callback) {
 
     if (existingInfra.version === infra.version && infra.images.sftp.tag === existingInfra.images.sftp.tag) return callback();
 
-    rebuild(callback);
+    rebuild({}, callback);
 }
 
-function rebuild(callback) {
+// options only supports ignoredDataDirs = [ pathString ]
+function rebuild(options, callback) {
+    assert.strictEqual(typeof options, 'object');
     assert.strictEqual(typeof callback, 'function');
 
+    if (options.ignoredDataDirs) assert(Array.isArray(options.ignoredDataDirs), 'Expecting ignoredDataDirs to be an array');
+
     debug('rebuilding container');
 
     const tag = infra.images.sftp.tag;
@@ -37,6 +41,11 @@ function rebuild(callback) {
         result.forEach(function (app) {
             if (!app.dataDir) return;
 
+            if (options.ignoredDataDirs && options.ignoredDataDirs.indexOf(app.dataDir) !== -1) {
+                debug(`Ignoring dataDir ${app.dataDir}`);
+                return;
+            }
+
             dataDirs.push({
                 hostDir: app.dataDir,
                 // /data is required since this is where the localstorage data would be in APPS_DATA_DIR