revert: tea 1.0 rewrite (#1122–#1126) (#1146)

Reverts #1126, #1125, #1124, #1123 and #1122. `go.mod` keeps the Go 1.26 line with toolchain `go1.26.9` (instead of the original `go1.26.6`) so the security fix from #1131 isn't lost. reopens #69 reopens #141 reopens #162 reopens #172 reopens #197 reopens #232 reopens #240 reopens #246 reopens #323 reopens #325 reopens #326 reopens #328 reopens #344 reopens #351 reopens #373 reopens #403 reopens #406 reopens #417 reopens #430 reopens #457 reopens #480 reopens #482 reopens #489 reopens #490 reopens #498 reopens #500 reopens #504 reopens #510 reopens #516 reopens #523 reopens #556 reopens #560 reopens #569 reopens #571 reopens #602 reopens #632 reopens #633 reopens #643 reopens #666 reopens #670 reopens #672 reopens #677 reopens #683 reopens #697 reopens #726 reopens #737 reopens #770 reopens #779 reopens #804 reopens #817 reopens #831 reopens #833 reopens #834 reopens #908 reopens #966 reopens #1023 reopens #1029 reopens #1032 reopens #1050 reopens #1052 reopens #1069 reopens #1073 reopens #1087 reopens #1091 reopens #1094 reopens #1110 reopens #1115 reopens #1116 reopens #1118 Reviewed-on: https://gitea.com/gitea/tea/pulls/1146 Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>
2026-10-26 11:01:25 +01:00 · 2026-10-18 20:56:33 +00:00
1 parent 33bb12729e
commit c5f674111a
@@ -0,0 +1,85 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"gitea.dev/tea/modules/filelock"
+)
+
+const (
+	// LockTimeout is the default timeout for acquiring the config file lock.
+	LockTimeout = 5 * time.Second
+
+	// mutexPollInterval is how often to retry acquiring the in-process mutex.
+	mutexPollInterval = 10 * time.Millisecond
+)
+
+// configMutex protects in-process concurrent access to the config.
+var configMutex sync.Mutex
+
+// acquireConfigLock acquires both the in-process mutex and a file lock.
+// Returns an unlock function that must be called to release both locks.
+// The timeout applies to acquiring the file lock; the mutex acquisition
+// uses the same timeout via a TryLock loop.
+func acquireConfigLock(lockPath string, timeout time.Duration) (unlock func() error, err error) {
+	// Try to acquire mutex with timeout
+	deadline := time.Now().Add(timeout)
+	for {
+		if configMutex.TryLock() {
+			break
+		}
+		if time.Now().After(deadline) {
+			return nil, fmt.Errorf("timeout waiting for config mutex")
+		}
+		time.Sleep(mutexPollInterval)
+	}
+
+	// Mutex acquired, now try file lock
+	remaining := max(time.Until(deadline), 0)
+	locker := filelock.New(lockPath, remaining)
+
+	fileUnlock, err := locker.Acquire()
+	if err != nil {
+		configMutex.Unlock()
+		return nil, err
+	}
+
+	// Return unlock function
+	return func() error {
+		unlockErr := fileUnlock()
+		configMutex.Unlock()
+		return unlockErr
+	}, nil
+}
+
+// getConfigLockPath returns the path to the lock file for the config.
+func getConfigLockPath() string {
+	return GetConfigPath() + ".lock"
+}
+
+// withConfigLock executes the given function while holding the config lock.
+// It acquires the lock, reloads the config from disk, executes fn, and releases the lock.
+func withConfigLock(fn func() error) (retErr error) {
+	lockPath := getConfigLockPath()
+	unlock, err := acquireConfigLock(lockPath, LockTimeout)
+	if err != nil {
+		return fmt.Errorf("failed to acquire config lock: %w", err)
+	}
+	defer func() {
+		if unlockErr := unlock(); unlockErr != nil && retErr == nil {
+			retErr = fmt.Errorf("failed to release config lock: %w", unlockErr)
+		}
+	}()
+
+	// Reload config from disk to get latest state
+	if err := reloadConfigFromDisk(); err != nil {
+		return err
+	}
+
+	return fn()
+}