Obsolete CentOS5

README.ja.md

@@ -397,7 +397,7 @@ web/app server in the same configuration under the load balancer
 | Ubuntu      |          12, 14, 16|
 | Debian      |                7, 8|
 | RHEL        |             5, 6, 7|
-| CentOS      |             5, 6, 7|
+| CentOS      |                6, 7|
 | Amazon Linux|                 All|
 | FreeBSD     |              10, 11|
 | Raspbian    |     Wheezy, Jessie |

README.md

@@ -398,7 +398,7 @@ If there is a staging environment with the same configuration as the production
 | Ubuntu      |          12, 14, 16|
 | Debian      |                7, 8|
 | RHEL        |             5, 6, 7|
-| CentOS      |             5, 6, 7|
+| CentOS      |                6, 7|
 | Amazon Linux|                 All|
 | FreeBSD     |              10, 11|
 | Raspbian    |     Wheezy, Jessie |

scan/redhat.go

@@ -151,7 +151,6 @@ func (o *redhat) checkIfSudoNoPasswd() error {
 	return nil
 }
 
-// CentOS 5 	... yum-changelog
 // CentOS 6, 7 	... yum-plugin-changelog
 // RHEL 5     	... yum-security
 // RHEL 6, 7    ... -
@@ -169,12 +168,25 @@ func (o *redhat) checkDependencies() error {
 		return fmt.Errorf(msg)
 	}
 
+	if o.Distro.Family == "centos" {
+		if majorVersion < 6 {
+			msg := fmt.Sprintf("CentOS %s is not supported", o.Distro.Release)
+			o.log.Errorf(msg)
+			return fmt.Errorf(msg)
+		}
+
+		// --assumeno option of yum is needed.
+		cmd := "yum -h | grep assumeno"
+		if r := o.exec(cmd, noSudo); !r.isSuccess() {
+			msg := fmt.Sprintf("Installed yum is old. Please update yum and then retry")
+			o.log.Errorf(msg)
+			return fmt.Errorf(msg)
+		}
+	}
+
 	switch o.Distro.Family {
 	case "centos":
 		packName = "yum-plugin-changelog"
-		if majorVersion < 6 {
-			packName = "yum-changelog"
-		}
 	case "rhel":
 		if majorVersion < 6 {
 			packName = "yum-security"