fix: kube binding checked filesystem and posix formating for df command

Dockerfile

@@ -39,7 +39,7 @@ RUN export GOARCH=$TARGETARCH; \
     export CGO_ENABLED=0; \
     go build -o bin/bot-$GOOS-$GOARCH cmd/main.go
 
-FROM scratch
+FROM alpine:3.12.4
 
 USER appuser:appuser
 

manifests/common.tf

@@ -25,6 +25,7 @@ EOF
 
 locals {
   config_volume_name = "system-bot-volume"
+  checked_filesystem = "host-checked-filesystem"
 }
 
 resource "kubernetes_cron_job" "slack_bot_checker" {
@@ -54,6 +55,13 @@ resource "kubernetes_cron_job" "slack_bot_checker" {
             }
           }
           spec {
+            volume {
+              name = local.checked_filesystem
+              host_path {
+                path = "/var/lib/kubernetes/volumes"
+                type = "Directory"
+              }
+            }
             volume {
               name = local.config_volume_name
               config_map {
@@ -68,6 +76,10 @@ resource "kubernetes_cron_job" "slack_bot_checker" {
                 mount_path = "/conf"
                 name = local.config_volume_name
               }
+              volume_mount {
+                mount_path = "/host"
+                name = local.checked_filesystem
+              }
             }
           }
         }

pkg/check/df.go

@@ -37,7 +37,7 @@ func NewDfChecker() *DfChecker {
 	return &DfChecker{
 		CliChecker: CliChecker{
 			alertingMessage: dfMessage,
-			command:         []string{"bash", "-c", "df | grep -v 'auto_home'"},
+			command:         []string{"sh", "-c", "df -P | grep -v 'auto_home'"},
 		},
 		pourcentRegexMatcher: regexp.MustCompile(`(?P<value>.*)%`),
 	}
@@ -60,6 +60,7 @@ func (dc *DfChecker) Parse(stdout string) interface{} {
 		}
 
 		valueIndex := dc.pourcentRegexMatcher.SubexpIndex("value")
+		log.Printf("df column : %+v\n", cleanedColumns)
 		v, err := strconv.Atoi(dc.pourcentRegexMatcher.FindStringSubmatch(cleanedColumns[4])[valueIndex])
 		if err != nil {
 			v = -1