#30: Add uninstall feature with reboot to handle WinFSP upgrades/downgrades

src/helpers.js

@@ -12,6 +12,55 @@ const _getDataDirectory = () => {
   return _resolvePath(Constants.DATA_LOCATIONS[os.platform()]);
 };
 
+const _executeProcess = (command, args=[]) => {
+  return new Promise((resolve, reject) => {
+    const processOptions = {
+      detached: true,
+      shell: false,
+    };
+
+    const process = new spawn(command, args, processOptions);
+    const pid = process.pid;
+
+    process.on('error', (err) => {
+      reject(err, pid);
+    });
+
+    process.on('exit', (code) => {
+      resolve(code);
+    });
+
+    process.unref();
+  });
+};
+
+const _execProcessGetOutput = (cmd, args) => {
+  return new Promise((resolve, reject) => {
+    const proc = spawn(cmd, args, {
+      env: process.env,
+      stdio: ['ignore', 'pipe', 'pipe']
+    });
+
+    let output;
+    proc.stdout.on('data', data => {
+      output += data.toString();
+    });
+
+    proc.on('error', (err) => {
+      reject(err);
+    });
+
+    proc.on('exit', () => {
+      const lines = output
+      .replace(/\r\n/g, '\n')
+      .split('\n');
+      resolve(lines);
+    });
+
+    proc.unref();
+  });
+};
+
 const _resolvePath = str => {
   if (os.platform() === 'win32') {
     return str.replace(/%([^%]+)%/g, (_, n) => {
@@ -484,6 +533,65 @@ module.exports.mkDirByPathSync = (targetDir, { isRelativeToScript = false } = {}
   }, initDir);
 };
 
+module.exports.performWindowsUninstall = names => {
+  return new Promise((resolve, reject) => {
+    if (os.platform() !== 'win32') {
+      reject('Windows OS is not being used');
+    } else {
+      const cmd = path.join(process.env.windir, 'system32', 'reg.exe');
+      const args = ["QUERY", "HKLM\\SOFTWARE\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall"];
+      _execProcessGetOutput(cmd, args)
+        .then(lines => {
+          const parseLine = index => {
+            if (index < lines.length) {
+              const line = lines[index];
+              if (line.startsWith('HKEY_LOCAL_MACHINE\\')) {
+                let args2 = JSON.parse(JSON.stringify(args));
+                args2[1] = 'HKLM\\' + line.substr(19);
+                args2.push('/v');
+                args2.push('DisplayName');
+                args2.push('/t');
+                args2.push('REG_SZ');
+                _execProcessGetOutput(cmd, args2)
+                  .then(lines => {
+                    const value = lines[2].trim().substr(args2[3].length).trim().substr(6).trim();
+                    if (names.includes(value)) {
+                      const items = line.split('\\');
+                      const productCode = items[items.length - 1];
+                      _executeProcess('msiexec.exe', ['/x', productCode, '/norestart'])
+                        .then(code => {
+                          if ((code === 0) || (code === 3010) || (code === 1641)) {
+                            resolve(true);
+                          } else {
+                            reject('[' + value + '] uninstall failed: ' + code);
+                          }
+                        })
+                        .catch(err => {
+                          reject(err);
+                        });
+                    } else {
+                      parseLine(++index);
+                    }
+                  })
+                  .catch(err=> {
+                    parseLine(++index);
+                  });
+              } else {
+                parseLine(++index);
+              }
+            } else {
+              resolve(false);
+            }
+          };
+          parseLine(0);
+        })
+        .catch( err => {
+          reject(err);
+        });
+    }
+  });
+};
+
 module.exports.removeDirectoryRecursively = (p) => {
   if (fs.existsSync(p)) {
     fs