From 33412a25357abc2e712e5cb9e75d262f2f58a7e9 Mon Sep 17 00:00:00 2001
From: Yevhen Vydolob <yvydolob@redhat.com>
Date: Thu, 14 Dec 2023 10:39:46 +0200
Subject: [PATCH] Fix slice bounds out of range error on remove host entries

---
 pkg/hosts/hosts.go      | 21 ++++++---------------
 pkg/hosts/hosts_test.go | 12 ++++++++++++
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/pkg/hosts/hosts.go b/pkg/hosts/hosts.go
index e0af6331..1364572a 100644
--- a/pkg/hosts/hosts.go
+++ b/pkg/hosts/hosts.go
@@ -173,17 +173,6 @@ func (h *Hosts) Remove(hosts []string) error {
 		return err
 	}
 
-	uniqueHosts := map[string]bool{}
-	for i := 0; i < len(hosts); i++ {
-		uniqueHosts[hosts[i]] = true
-	}
-
-	var hostEntries = make(map[string]struct{}, len(uniqueHosts))
-
-	for key := range uniqueHosts {
-		hostEntries[key] = struct{}{}
-	}
-
 	start, end := h.findCrcSection()
 
 	h.Lock()
@@ -196,11 +185,13 @@ func (h *Hosts) Remove(hosts []string) error {
 				continue
 			}
 
-			for hostIdx, hostname := range line.Hostnames {
-				if _, ok := hostEntries[hostname]; ok {
-					h.removeHostFromLine(line, hostIdx, i)
+			for _, hostToRemove := range hosts {
+				for hostIdx, hostname := range line.Hostnames {
+					if hostname == hostToRemove {
+						h.removeHostFromLine(line, hostIdx, i)
+						break
+					}
 				}
-
 			}
 		}
 	} else {
diff --git a/pkg/hosts/hosts_test.go b/pkg/hosts/hosts_test.go
index f079aa3d..34b7df0d 100644
--- a/pkg/hosts/hosts_test.go
+++ b/pkg/hosts/hosts_test.go
@@ -234,6 +234,18 @@ func TestRemoveOnOldHostFile(t *testing.T) {
 	assert.Equal(t, hostsTemplate, string(content))
 }
 
+func TestDeleteSliceBoundErrorOnRemove(t *testing.T) {
+	dir, err := os.MkdirTemp("", "hosts")
+	assert.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	hostsFile := filepath.Join(dir, "hosts")
+	assert.NoError(t, os.WriteFile(hostsFile, []byte(hostsTemplate+eol()+crcSection("192.168.130.11   api.crc.testing canary-openshift-ingress-canary.apps-crc.testing console-openshift-console.apps-crc.testing default-route-openshift-image-registry.apps-crc.testing downloads-openshift-console.apps-crc.testing oauth-openshift.apps-crc.testing")), 0600))
+	host := hosts(t, hostsFile)
+
+	assert.NoError(t, host.Remove([]string{"api.crc.testing", "oauth-openshift.apps-crc.testing", "console-openshift-console.apps-crc.testing", "downloads-openshift-console.apps-crc.testing", "canary-openshift-ingress-canary.apps-crc.testing", "default-route-openshift-image-registry.apps-crc.testing"}))
+}
+
 func hosts(t *testing.T, hostsFile string) Hosts {
 	config, _ := libhosty.NewHostsFileConfig(hostsFile)
 	file, err := libhosty.InitWithConfig(config)