1 files changed, 143 insertions, 0 deletions
diff --git a/modules/git/hook.go b/modules/git/hook.go
new file mode 100644
index 00000000..46f93ce1
--- /dev/null
+++ b/modules/git/hook.go
@@ -0,0 +1,143 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"errors"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
+)
+
+// hookNames is a list of Git server hooks' name that are supported.
+var hookNames = []string{
+	"pre-receive",
+	"update",
+	"post-receive",
+}
+
+// ErrNotValidHook error when a git hook is not valid
+var ErrNotValidHook = errors.New("not a valid Git hook")
+
+// IsValidHookName returns true if given name is a valid Git hook.
+func IsValidHookName(name string) bool {
+	for _, hn := range hookNames {
+		if hn == name {
+			return true
+		}
+	}
+	return false
+}
+
+// Hook represents a Git hook.
+type Hook struct {
+	name     string
+	IsActive bool   // Indicates whether repository has this hook.
+	Content  string // Content of hook if it's active.
+	Sample   string // Sample content from Git.
+	path     string // Hook file path.
+}
+
+// GetHook returns a Git hook by given name and repository.
+func GetHook(repoPath, name string) (*Hook, error) {
+	if !IsValidHookName(name) {
+		return nil, ErrNotValidHook
+	}
+	h := &Hook{
+		name: name,
+		path: path.Join(repoPath, "hooks", name+".d", name),
+	}
+	samplePath := filepath.Join(repoPath, "hooks", name+".sample")
+	if isFile(h.path) {
+		data, err := os.ReadFile(h.path)
+		if err != nil {
+			return nil, err
+		}
+		h.IsActive = true
+		h.Content = string(data)
+	} else if isFile(samplePath) {
+		data, err := os.ReadFile(samplePath)
+		if err != nil {
+			return nil, err
+		}
+		h.Sample = string(data)
+	}
+	return h, nil
+}
+
+// Name return the name of the hook
+func (h *Hook) Name() string {
+	return h.name
+}
+
+// Update updates hook settings.
+func (h *Hook) Update() error {
+	if len(strings.TrimSpace(h.Content)) == 0 {
+		if isExist(h.path) {
+			err := util.Remove(h.path)
+			if err != nil {
+				return err
+			}
+		}
+		h.IsActive = false
+		return nil
+	}
+	d := filepath.Dir(h.path)
+	if err := os.MkdirAll(d, os.ModePerm); err != nil {
+		return err
+	}
+
+	err := os.WriteFile(h.path, []byte(strings.ReplaceAll(h.Content, "\r", "")), os.ModePerm)
+	if err != nil {
+		return err
+	}
+	h.IsActive = true
+	return nil
+}
+
+// ListHooks returns a list of Git hooks of given repository.
+func ListHooks(repoPath string) (_ []*Hook, err error) {
+	if !isDir(path.Join(repoPath, "hooks")) {
+		return nil, errors.New("hooks path does not exist")
+	}
+
+	hooks := make([]*Hook, len(hookNames))
+	for i, name := range hookNames {
+		hooks[i], err = GetHook(repoPath, name)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return hooks, nil
+}
+
+const (
+	// HookPathUpdate hook update path
+	HookPathUpdate = "hooks/update"
+)
+
+// SetUpdateHook writes given content to update hook of the repository.
+func SetUpdateHook(repoPath, content string) (err error) {
+	log.Debug("Setting update hook: %s", repoPath)
+	hookPath := path.Join(repoPath, HookPathUpdate)
+	isExist, err := util.IsExist(hookPath)
+	if err != nil {
+		log.Debug("Unable to check if %s exists. Error: %v", hookPath, err)
+		return err
+	}
+	if isExist {
+		err = util.Remove(hookPath)
+	} else {
+		err = os.MkdirAll(path.Dir(hookPath), os.ModePerm)
+	}
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(hookPath, []byte(content), 0o777)
+}