Method acquireUpdateLock

src/Squirrel/UpdateManager.cs:265–288

()

        }

        Task<IDisposable> acquireUpdateLock()
        {
            if (updateLock != null) return Task.FromResult(updateLock);

            return Task.Run(() => {
                var key = Utility.CalculateStreamSHA1(new MemoryStream(Encoding.UTF8.GetBytes(rootAppDirectory)));

                IDisposable theLock;
                try {
                    theLock = ModeDetector.InUnitTestRunner() ?
                        Disposable.Create(() => {}) : new SingleGlobalInstance(key, TimeSpan.FromMilliseconds(2000));
                } catch (TimeoutException) {
                    throw new TimeoutException("Couldn't acquire update lock, another instance may be running updates");
                }

                var ret = Disposable.Create(() => {
                    theLock.Dispose();
                    updateLock = null;
                });

                updateLock = ret;
                return ret;
            });
        }

        /// <summary>
        /// Calculates the total percentage of a specific step that should report within a specific range.