rewrite pre-commit, post-commit and options hooks (fixes #1250) (#1257)

* issue #1250, replace {pre,post}-receive and update hooks with a single shell script that does not require custom hooks to be a sh-script

* issue #1250, make script posix compilant

* v23, add migration script to update {pre,post}-receive and update hooks

* migration: use a more common name and rename v23 to v26 to avoid conflicts

* gofmt'ed and added copyright header

* fix SyncRepositoryHooks to also sync wiki repos

3 files changed, 96 insertions, 6 deletions

diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index f651a9b787..07a56e879b 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -100,6 +100,8 @@ var migrations = []Migration{
 	NewMigration("change the key_id and primary_key_id type", changeGPGKeysColumns),
 	// v25 -> v26
 	NewMigration("add show field in user openid table", addUserOpenIDShow),
+	// v26 -> v27
+	NewMigration("generate and migrate repo and wiki Git hooks", generateAndMigrateGitHookChains),
 }
 
 // Migrate database to current version
diff --git a/models/migrations/v26.go b/models/migrations/v26.go
new file mode 100644
index 0000000000..8b1c9a6326
--- /dev/null
+++ b/models/migrations/v26.go
@@ -0,0 +1,87 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/Unknwon/com"
+	"github.com/go-xorm/xorm"
+)
+
+func generateAndMigrateGitHookChains(x *xorm.Engine) (err error) {
+	type Repository struct {
+		ID      int64
+		OwnerID int64
+		Name    string
+	}
+	type User struct {
+		ID   int64
+		Name string
+	}
+
+	var (
+		hookNames = []string{"pre-receive", "update", "post-receive"}
+		hookTpl   = fmt.Sprintf("#!/usr/bin/env %s\ndata=$(cat)\nexitcodes=\"\"\nhookname=$(basename $0)\nGIT_DIR=${GIT_DIR:-$(dirname $0)}\n\nfor hook in ${GIT_DIR}/hooks/${hookname}.d/*; do\ntest -x \"${hook}\" || continue\necho \"${data}\" | \"${hook}\"\nexitcodes=\"${exitcodes} $?\"\ndone\n\nfor i in ${exitcodes}; do\n[ ${i} -eq 0 ] || exit ${i}\ndone\n", setting.ScriptType)
+	)
+
+	return x.Where("id > 0").Iterate(new(Repository),
+		func(idx int, bean interface{}) error {
+			repo := bean.(*Repository)
+			user := new(User)
+			has, err := x.Where("id = ?", repo.OwnerID).Get(user)
+			if err != nil {
+				return fmt.Errorf("query owner of repository [repo_id: %d, owner_id: %d]: %v", repo.ID, repo.OwnerID, err)
+			} else if !has {
+				return nil
+			}
+
+			repoPaths := []string{
+				filepath.Join(setting.RepoRootPath, strings.ToLower(user.Name), strings.ToLower(repo.Name)) + ".git",
+				filepath.Join(setting.RepoRootPath, strings.ToLower(user.Name), strings.ToLower(repo.Name)) + ".wiki.git",
+			}
+
+			for _, repoPath := range repoPaths {
+				if com.IsExist(repoPath) {
+					hookDir := filepath.Join(repoPath, "hooks")
+
+					for _, hookName := range hookNames {
+						oldHookPath := filepath.Join(hookDir, hookName)
+
+						// compare md5sums of hooks
+						if com.IsExist(oldHookPath) {
+
+							f, err := os.Open(oldHookPath)
+							if err != nil {
+								return fmt.Errorf("cannot open old hook file '%s': %v", oldHookPath, err)
+							}
+							defer f.Close()
+							h := md5.New()
+							if _, err := io.Copy(h, f); err != nil {
+								return fmt.Errorf("cannot read old hook file '%s': %v", oldHookPath, err)
+							}
+							if hex.EncodeToString(h.Sum(nil)) == "6718ef67d0834e0a7908259acd566e3f" {
+								return nil
+							}
+						}
+
+						if err = ioutil.WriteFile(oldHookPath, []byte(hookTpl), 0777); err != nil {
+							return fmt.Errorf("write old hook file '%s': %v", oldHookPath, err)
+						}
+					}
+				}
+			}
+			return nil
+		})
+}
diff --git a/models/repo.go b/models/repo.go
index 54be49d902..8548accb5d 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -845,11 +845,7 @@ func cleanUpMigrateGitConfig(configPath string) error {
 func createDelegateHooks(repoPath string) (err error) {
 	var (
 		hookNames = []string{"pre-receive", "update", "post-receive"}
-		hookTpls  = []string{
-			fmt.Sprintf("#!/usr/bin/env %s\nORI_DIR=`pwd`\nSHELL_FOLDER=$(cd \"$(dirname \"$0\")\";pwd)\ncd \"$ORI_DIR\"\nfor i in `ls \"$SHELL_FOLDER/pre-receive.d\"`; do\n    sh \"$SHELL_FOLDER/pre-receive.d/$i\"\ndone", setting.ScriptType),
-			fmt.Sprintf("#!/usr/bin/env %s\nORI_DIR=`pwd`\nSHELL_FOLDER=$(cd \"$(dirname \"$0\")\";pwd)\ncd \"$ORI_DIR\"\nfor i in `ls \"$SHELL_FOLDER/update.d\"`; do\n    sh \"$SHELL_FOLDER/update.d/$i\" $1 $2 $3\ndone", setting.ScriptType),
-			fmt.Sprintf("#!/usr/bin/env %s\nORI_DIR=`pwd`\nSHELL_FOLDER=$(cd \"$(dirname \"$0\")\";pwd)\ncd \"$ORI_DIR\"\nfor i in `ls \"$SHELL_FOLDER/post-receive.d\"`; do\n    sh \"$SHELL_FOLDER/post-receive.d/$i\"\ndone", setting.ScriptType),
-		}
+		hookTpl = fmt.Sprintf("#!/usr/bin/env %s\ndata=$(cat)\nexitcodes=\"\"\nhookname=$(basename $0)\nGIT_DIR=${GIT_DIR:-$(dirname $0)}\n\nfor hook in ${GIT_DIR}/hooks/${hookname}.d/*; do\ntest -x \"${hook}\" || continue\necho \"${data}\" | \"${hook}\"\nexitcodes=\"${exitcodes} $?\"\ndone\n\nfor i in ${exitcodes}; do\n[ ${i} -eq 0 ] || exit ${i}\ndone\n", setting.ScriptType)
 		giteaHookTpls = []string{
 			fmt.Sprintf("#!/usr/bin/env %s\n\"%s\" hook --config='%s' pre-receive\n", setting.ScriptType, setting.AppPath, setting.CustomConf),
 			fmt.Sprintf("#!/usr/bin/env %s\n\"%s\" hook --config='%s' update $1 $2 $3\n", setting.ScriptType, setting.AppPath, setting.CustomConf),
@@ -868,7 +864,7 @@ func createDelegateHooks(repoPath string) (err error) {
 		}
 
 		// WARNING: This will override all old server-side hooks
-		if err = ioutil.WriteFile(oldHookPath, []byte(hookTpls[i]), 0777); err != nil {
+		if err = ioutil.WriteFile(oldHookPath, []byte(hookTpl), 0777); err != nil {
 			return fmt.Errorf("write old hook file '%s': %v", oldHookPath, err)
 		}
 
@@ -1909,6 +1905,11 @@ func SyncRepositoryHooks() error {
 			if err := createDelegateHooks(bean.(*Repository).RepoPath()); err != nil {
 				return fmt.Errorf("SyncRepositoryHook: %v", err)
 			}
+			if bean.(*Repository).HasWiki() {
+				if err := createDelegateHooks(bean.(*Repository).WikiPath()); err != nil {
+					return fmt.Errorf("SyncRepositoryHook: %v", err)
+				}
+			}
 			return nil
 		})
 }