krb5: fix url parse and update versions (#17581)

var/spack/repos/builtin/packages/krb5/package.py

@@ -9,11 +9,24 @@
 class Krb5(AutotoolsPackage):
     """Network authentication protocol"""
 
-    homepage = "https://kerberos.org"
-    url      = "https://kerberos.org/dist/krb5/1.16/krb5-1.16.1.tar.gz"
-
+    homepage   = "https://kerberos.org"
+    url        = "https://kerberos.org/dist/krb5/1.16/krb5-1.16.1.tar.gz"
+    list_url   = "https://kerberos.org/dist/krb5/"
+    list_depth = 1
+
+    version('1.18.2', sha256='c6e4c9ec1a98141c3f5d66ddf1a135549050c9fab4e9a4620ee9b22085873ae0')
+    version('1.18.1', sha256='02a4e700f10936f937cd1a4c303cab8687a11abecc6107bd4b706b9329cd5400')
+    version('1.18',   sha256='73913934d711dcf9d5f5605803578edb44b9a11786df3c1b2711f4e1752f2c88')
+    version('1.17.1', sha256='3706d7ec2eaa773e0e32d3a87bf742ebaecae7d064e190443a3acddfd8afb181')
+    version('1.17',   sha256='5a6e2284a53de5702d3dc2be3b9339c963f9b5397d3fbbc53beb249380a781f5')
+    version('1.16.3', sha256='e40499df7c6dbef0cf9b11870a0e167cde827737d8b2c06a9436334f08ab9b0d')
+    version('1.16.2', sha256='9f721e1fe593c219174740c71de514c7228a97d23eb7be7597b2ae14e487f027')
     version('1.16.1', sha256='214ffe394e3ad0c730564074ec44f1da119159d94281bbec541dc29168d21117')
 
+    def url_for_version(self, version):
+        url = 'https://kerberos.org/dist/krb5/{0}/krb5-{1}.tar.gz'
+        return url.format(version.up_to(2), version)
+
     depends_on('bison', type='build')
     depends_on('openssl')