Send email if build is successful after failure

See gh-10790

ci/pipeline.yml

@@ -137,12 +137,27 @@ jobs:
       do:
       - put: repo-status-build
         params: { state: "failure", commit: "git-repo" }
+      - task: determine-email-body
+        image: spring-boot-ci-image
+        file: git-repo/ci/tasks/determine-email-body.yml
+        params:
+          STATE: failure
       - put: email-notification
         params:
-          subject_text: "Build failure ${BUILD_PIPELINE_NAME} / ${BUILD_JOB_NAME} / ${BUILD_NAME}"
-          body_text: "Build ${ATC_EXTERNAL_URL}/teams/${BUILD_TEAM_NAME}/pipelines/${BUILD_PIPELINE_NAME}/jobs/${BUILD_JOB_NAME}/builds/${BUILD_NAME} has failed!"
+          subject: email-details/subject
+          body: email-details/body
+  - do:
+    - task: determine-email-body
+      image: spring-boot-ci-image
+      file: git-repo/ci/tasks/determine-email-body.yml
+      params:
+        STATE: success
   - put: repo-status-build
     params: { state: "success", commit: "git-repo" }
+  - put: email-notification
+    params:
+      subject: email-details/subject
+      body: email-details/body
   - put: artifactory-repo
     params: &artifactory-params
       repo: libs-snapshot-local

ci/scripts/determine-email-body.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -e
+
+mkdir email-details
+
+PREV_SHA=$(git rev-parse HEAD^1)
+PREV_STATUSES=$(curl https://api.github.com/repos/spring-projects/spring-boot/commits/$PREV_SHA/statuses)
+PREV_STATES=echo $PREV_STATUSES | jq -r '.[]  | select(.context == "build") | .state'
+WAS_PREV_SUCCESSFUL=$(echo $PREV_STATES | grep 'success')
+
+if [[ $STATE == "success" ]];then
+	echo "Build SUCCESSFUL ${BUILD_PIPELINE_NAME} / ${BUILD_JOB_NAME} / ${BUILD_NAME}" > email-details/subject
+	if [[ $WAS_PREV_SUCCESSFUL == "" ]];then
+    	echo "Build ${ATC_EXTERNAL_URL}/teams/${BUILD_TEAM_NAME}/pipelines/${BUILD_PIPELINE_NAME}/jobs/${BUILD_JOB_NAME}/builds/${BUILD_NAME} is successful!" > email-details/body
+	elif [[ $WAS_PREV_SUCCESSFUL == "success" ]];then
+		echo "" > email-details/body
+	fi
+fi
+elif [[ $STATE == "failure" ]];then
+	echo "Build ${ATC_EXTERNAL_URL}/teams/${BUILD_TEAM_NAME}/pipelines/${BUILD_PIPELINE_NAME}/jobs/${BUILD_JOB_NAME}/builds/${BUILD_NAME} has failed!" > email-details/body
+	if [[ $WAS_PREV_SUCCESSFUL == "" ]];then
+		echo "Still FAILING ${BUILD_PIPELINE_NAME} / ${BUILD_JOB_NAME} / ${BUILD_NAME}" > email-details/subject
+	elif [[ $WAS_PREV_SUCCESSFUL == "success" ]];then
+		echo "Build FAILURE ${BUILD_PIPELINE_NAME} / ${BUILD_JOB_NAME} / ${BUILD_NAME}" > email-details/subject
+	fi
+fi

ci/tasks/determine-email-body.yml

@@ -0,0 +1,8 @@
+---
+platform: linux
+inputs:
+- name: git-repo
+outputs:
+- name: email-details
+run:
+  path: git-repo/ci/scripts/determine-email-body.sh