feat: add the ability to set a MAILFROM value for local cron emails

Closes #7419

plugins/cron/cron.go

@@ -12,12 +12,14 @@ import (
 var (
 	// DefaultProperties is a map of all valid cron properties with corresponding default property values
 	DefaultProperties = map[string]string{
-		"mailto": "",
+		"mailfrom": "",
+		"mailto":   "",
 	}
 
 	// GlobalProperties is a map of all valid global cron properties
 	GlobalProperties = map[string]bool{
-		"mailto": true,
+		"mailfrom": true,
+		"mailto":   true,
 	}
 )
 

plugins/cron/report.go

@@ -13,6 +13,7 @@ func ReportSingleApp(appName string, format string, infoFlag string) error {
 	}
 
 	flags := map[string]common.ReportFunc{
+		"--cron-mailfrom":   reportMailfrom,
 		"--cron-mailto":     reportMailto,
 		"--cron-task-count": reportTasks,
 	}
@@ -28,6 +29,10 @@ func ReportSingleApp(appName string, format string, infoFlag string) error {
 	return common.ReportSingleApp("cron", appName, infoFlag, infoFlags, flagKeys, format, trimPrefix, uppercaseFirstCharacter)
 }
 
+func reportMailfrom(_ string) string {
+	return common.PropertyGet("cron", "--global", "mailfrom")
+}
+
 func reportMailto(_ string) string {
 	return common.PropertyGet("cron", "--global", "mailto")
 }

plugins/cron/set.go

@@ -3,6 +3,10 @@ package cron
 import "errors"
 
 func validateSetValue(appName string, key string, value string) error {
+	if key == "mailfrom" && appName != "--global" {
+		return errors.New("Property cannot be specified on a per-app basis")
+	}
+
 	if key == "mailto" && appName != "--global" {
 		return errors.New("Property cannot be specified on a per-app basis")
 	}

plugins/cron/templates/cron.tmpl

@@ -1,3 +1,6 @@
+{{ if .Mailfrom -}}
+MAILFROM={{ .Mailfrom }}
+{{ end -}}
 {{ if .Mailto -}}
 MAILTO={{ .Mailto }}
 {{ end -}}

plugins/cron/triggers.go

@@ -9,7 +9,11 @@ import (
 
 // TriggerCronGetProperty writes the cron key to stdout for a given app container
 func TriggerCronGetProperty(appName string, key string) error {
-	if key != "mailto" {
+	validProperties := map[string]bool{
+		"mailfrom": true,
+		"mailto":   true,
+	}
+	if !validProperties[key] {
 		return errors.New("Invalid cron property specified")
 	}