Update gerrit-git-prep to use zuul refs.

Change-Id: I4b04c490495d731489e354b74906bb6f7209adfc
Reviewed-on: https://review.openstack.org/18193
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: James E. Blair <corvus@inaugust.com>

modules/jenkins/files/slave_scripts/gerrit-git-prep.sh

@@ -1,129 +1,41 @@
 #!/bin/bash -e
 
-# Needed environment variables:
-# GERRIT_PROJECT
-# GERRIT_BRANCH
-# GERRIT_REFSPEC or GERRIT_NEWREV or GERRIT_CHANGES
-#
-# GERRIT_CHANGES format:
-# GERRIT_CHANGES="gtest-org/test:master:refs/changes/20/420/1^gtest-org/test:master:refs/changes/21/421/1"
-# GERRIT_CHANGES="gtest-org/test:master:refs/changes/21/421/1"
-# GERRIT_CHANGES=""
-
 REVIEW_SITE=$1
+GIT_SITE=$2
+
 if [ -z "$REVIEW_SITE" ]
 then
   echo "The git site name (eg 'https://review.openstack.org') must be the first argument."
   exit 1
 fi
 
-GIT_SITE=$2
 if [ -z "$GIT_SITE" ]
 then
   echo "The git site name (eg 'http://zuul.openstack.org') must be the second argument."
   exit 1
 fi
 
-if [ -z "$GERRIT_NEWREV" ] && [ -z "$GERRIT_REFSPEC" ] && [ -z "$GERRIT_CHANGES" ]
+if [ -z "$ZUUL_REF" ]
 then
-    echo "This job may only be triggered by Gerrit."
+    echo "This job may only be triggered by Zuul."
     exit 1
 fi
 
-if [ ! -z "$GERRIT_CHANGES" ]
+if [ ! -z "$ZUUL_CHANGE" ]
 then
-    CHANGE_NUMBER=`echo $GERRIT_CHANGES|grep -Po ".*/\K\d+(?=/\d+)"`
+    echo "Triggered by: $REVIEW_SITE/$ZUUL_CHANGE"
-    echo "Triggered by: $REVIEW_SITE/$CHANGE_NUMBER"
 fi
 
-if [ ! -z "$GERRIT_REFSPEC" ]
-then
-    CHANGE_NUMBER=`echo $GERRIT_REFSPEC|grep -Po ".*/\K\d+(?=/\d+)"`
-    echo "Triggered by: $REVIEW_SITE/$CHANGE_NUMBER"
-fi
-
-function merge_change {
-    PROJECT=$1
-    REFSPEC=$2
-    MAX_ATTEMPTS=${3:-3}
-    COUNT=0
-
-    until git fetch $GIT_SITE/p/$PROJECT $REFSPEC
-    do
-        COUNT=$(($COUNT + 1))
-        logger -p user.warning -t 'gerrit-git-prep' FAILED: git fetch $GIT_SITE/p/$PROJECT $REFSPEC COUNT: $COUNT
-        if [ $COUNT -eq $MAX_ATTEMPTS ]
-        then
-            break
-        fi
-        SLEEP_TIME=$((30 + $RANDOM % 60))
-        logger -p user.warning -t 'gerrit-git-prep' sleep $SLEEP_TIME
-        sleep $SLEEP_TIME
-    done
-
-    if [ $COUNT -lt $MAX_ATTEMPTS ]
-    then
-        # This should be equivalent to what gerrit does if a repo is
-        # set to "merge commits when necessary" and "automatically resolve
-        # conflicts" is set to true:
-        git merge -s resolve FETCH_HEAD
-    else
-        # Failed to fetch too many times. Notify jenkins of the failure.
-        # This is necessary because set -e does not apply to the condition of
-        # until.
-        exit 1
-    fi
-}
-
-function merge_changes {
-    set +x
-    OIFS=$IFS
-    IFS='^'
-    for change in $GERRIT_CHANGES
-    do
-	OIFS2=$IFS
-	IFS=':'
-	change_array=($change)
-	IFS=$OIFS2
-
-	CHANGE_PROJECT=${change_array[0]}
-	CHANGE_BRANCH=${change_array[1]}
-	CHANGE_REFSPEC=${change_array[2]}
-
-	if [ "$CHANGE_PROJECT" = "$GERRIT_PROJECT" ] &&
-	   [ "$CHANGE_BRANCH" = "$GERRIT_BRANCH" ]; then
-	    set -x
-	    merge_change $CHANGE_PROJECT $CHANGE_REFSPEC
-	    set +x
-	fi
-    done
-    IFS=$OIFS
-    set -x
-}
-
 set -x
 if [[ ! -e .git ]]
 then
-    git clone $GIT_SITE/p/$GERRIT_PROJECT .
+    git clone $GIT_SITE/p/$ZUUL_PROJECT .
 fi
 git remote update || git remote update # attempt to work around bug #925790
 git reset --hard
 git clean -x -f -d -q
 
-if [ -z "$GERRIT_NEWREV" ]
+git fetch $GIT_SITE/p/$ZUUL_PROJECT $ZUUL_REF
-then
+git checkout FETCH_HEAD
-    git checkout $GERRIT_BRANCH
+git reset --hard FETCH_HEAD
-    git reset --hard remotes/origin/$GERRIT_BRANCH
+git clean -x -f -d -q
-    git clean -x -f -d -q
-
-    if [ ! -z "$GERRIT_REFSPEC" ]
-    then
-        merge_change $GERRIT_PROJECT $GERRIT_REFSPEC
-    else
-        merge_changes
-    fi
-else
-    git checkout $GERRIT_NEWREV
-    git reset --hard $GERRIT_NEWREV
-    git clean -x -f -d -q
-fi