Support Export Compression

This update changes the support export command to produce a
compressed .tar.gz file instead of an uncompressed .tar file.
Relevant tests are updated accordingly.

Issue: [sc-18010]

Author: tjmoore4

internal/cmd/export.go

@@ -17,6 +17,7 @@ package cmd
 import (
 	"archive/tar"
 	"bytes"
+	"compress/gzip"
 	"context"
 	"fmt"
 	"io"
@@ -226,18 +227,25 @@ kubectl pgo support export daisy --monitoring-namespace another-namespace --outp
 		}
 
 		// Name file with year-month-day-HrMinSecTimezone suffix
-		// Example: crunchy_k8s_support_export_2022-08-08-115726-0400.tar
-		outputFile := "crunchy_k8s_support_export_" + time.Now().Format("2006-01-02-150405-0700") + ".tar"
+		// Example: crunchy_k8s_support_export_2022-08-08-115726-0400.tar.gz
+		outputFile := "crunchy_k8s_support_export_" + time.Now().Format("2006-01-02-150405-0700") + ".tar.gz"
 		// #nosec G304 -- We intentionally write to the directory supplied by the user.
 		tarFile, err := os.Create(outputDir + "/" + outputFile)
 		if err != nil {
 			return err
 		}
 
-		tw := tar.NewWriter(tarFile)
+		gw, err := gzip.NewWriterLevel(tarFile, gzip.BestCompression)
+		if err != nil {
+			return err
+		}
+		tw := tar.NewWriter(gw)
 		defer func() {
 			// ignore any errors from Close functions, the writers will be
 			// closed when the program exits
+			if gw != nil {
+				_ = gw.Close()
+			}
 			if tw != nil {
 				_ = tw.Close()
 			}

testing/kuttl/e2e/support-export/01--support_export.yaml

@@ -3,14 +3,23 @@ apiVersion: kuttl.dev/v1beta1
 kind: TestStep
 commands:
 - script: kubectl-pgo --namespace $NAMESPACE support export kuttl-support-cluster -o .
-- script: tar -xf ./crunchy_k8s_support_export_*.tar
+- script: tar -xf ./crunchy_k8s_support_export_*.tar.gz
 - script: |
     #!/bin/bash
 
     DIR="./kuttl-support-cluster/nodes/"
     LIST="${DIR}list"
 
-    CLEANUP="rm -r ./kuttl-support-cluster ./crunchy_k8s_support_export_*.tar"
+    CLEANUP="rm -r ./kuttl-support-cluster ./crunchy_k8s_support_export_*.tar.gz"
+
+    # check for expected gzip compression level
+    FILE_INFO=$(file ./crunchy_k8s_support_export_*.tar.gz)
+    [[ "${FILE_INFO}" == *'gzip compressed data, max compression'* ]] || {
+      echo "Expected gzip max compression message, got:"
+      echo "${FILE_INFO}"
+      eval "$CLEANUP"
+      exit 1
+    }
 
     # check for expected table header in the list file
     KV=$(awk 'NR==1 {print $9}' $LIST)
@@ -50,4 +59,4 @@ commands:
       exit 1
     fi
 
-- script: rm -r ./kuttl-support-cluster ./crunchy_k8s_support_export_*.tar
+- script: rm -r ./kuttl-support-cluster ./crunchy_k8s_support_export_*.tar.gz

testing/kuttl/e2e/support-export/21--support_export.yaml

@@ -3,11 +3,11 @@ apiVersion: kuttl.dev/v1beta1
 kind: TestStep
 commands:
 - script: kubectl-pgo --namespace $NAMESPACE support export kuttl-support-monitoring-cluster -o .
-- script: tar -xf ./crunchy_k8s_support_export_*.tar
+- script: tar -xf ./crunchy_k8s_support_export_*.tar.gz
 - script: |
     #!/bin/bash
 
-    CLEANUP="rm -r ./kuttl-support-monitoring-cluster ./monitoring ./crunchy_k8s_support_export_*.tar"
+    CLEANUP="rm -r ./kuttl-support-monitoring-cluster ./monitoring ./crunchy_k8s_support_export_*.tar.gz"
     CLUSTER_DIR="./kuttl-support-monitoring-cluster/logs/"
     MONITORING_DIR="./monitoring/logs/"
 
@@ -40,4 +40,4 @@ commands:
       exit 1
     fi
 
-- script: rm -r ./kuttl-support-monitoring-cluster ./monitoring ./crunchy_k8s_support_export_*.tar
+- script: rm -r ./kuttl-support-monitoring-cluster ./monitoring ./crunchy_k8s_support_export_*.tar.gz