Add repository migration step to preserve history

migrate.sh

@@ -13,7 +13,7 @@ set -o pipefail
 # ./migrate.sh 
 # mvn clean install -DskipTests
 
-DIR_TMP="migration"
+DIR_TMP="../migration"
 MODULE_CORE="core"
 GIT_BRANCH="refactoring/maven"
 PARENT_NAME="elasticsearch-parent"
@@ -59,17 +59,19 @@ function removeLines() {
 # migratePlugin short_name
 function migratePlugin() {
 	PLUGIN_GIT_REPO="https://github.com/elastic/elasticsearch-$1.git"
-
+	git remote add remote_$1 $PLUGIN_GIT_REPO
+	git fetch remote_$1 > /dev/null 2>/dev/null
 	echo "## Add $1 module from $PLUGIN_GIT_REPO"
-	
+
 	# echo "### fetch $1 project from $PLUGIN_GIT_REPO in plugins"
 	# If you want to run that locally, uncomment this line and comment one below
 	#cp -R ../elasticsearch-$1/* plugins/$1
-	git clone $PLUGIN_GIT_REPO plugins/$1 > /dev/null 2>/dev/null
-
-	# We can now add plugin module
-	insertLinesBefore "    <\/modules>" "        <module>$1<\/module>" "§" "plugins/pom.xml"
-
+	# git clone $PLUGIN_GIT_REPO plugins/$1 > /dev/null 2>/dev/null
+	git checkout -b migrate_$1 remote_$1/master > /dev/null 2>/dev/null
+	git remote rm remote_$1 > /dev/null 2>/dev/null
+	mkdir -p plugins/$1
+	git mv -k * plugins/$1 > /dev/null 2>/dev/null       
+	git rm .gitignore > /dev/null 2>/dev/null
 	# echo "### change $1 groupId to org.elasticsearch.plugins"
 	# Change the groupId to avoid conflicts with existing 2.0.0 versions.
 	replaceLine "    <groupId>org.elasticsearch<\/groupId>" "    <groupId>org.elasticsearch.plugin<\/groupId>" "plugins/$1/pom.xml"
@@ -90,8 +92,15 @@ function migratePlugin() {
 	rm plugins/$1/CONTRIBUTING.md
 
 	# echo "### commit changes"
+	git add --all .
+	git commit -m "add $1 module" > /dev/null
+	git checkout $GIT_BRANCH
+	git merge -m "migrate branch for $1" migrate_$1 > /dev/null 2>/dev/null
+	# We can now add plugin module
+	insertLinesBefore "    <\/modules>" "        <module>$1<\/module>" "§" "plugins/pom.xml"
 	git add .
 	git commit -m "add $1 module" > /dev/null
+	git branch -D migrate_$1
 }
 
 echo "# STEP 0 : prepare the job"
@@ -183,7 +192,8 @@ echo "# STEP 4 : Migrate plugins"
 
 # We need to add <modules></modules> in the plugins parent project as it does not exist
 insertLinesBefore "<\/project>" "    <modules>§    <\/modules>" "§" "plugins/pom.xml"
-
+git add plugins/pom.xml
+git commit -m "add modules section"
 # Analysis
 migratePlugin "analysis-kuromoji" 
 migratePlugin "analysis-smartcn"