Make prerelease tag optional in CI versions

Author: liggitt

cluster/common.sh

@@ -41,9 +41,9 @@ export KUBE_RELEASE_VERSION_DASHED_REGEX="v(0|[1-9][0-9]*)-(0|[1-9][0-9]*)-(0|[1
 #
 # TODO: KUBE_CI_VERSION_REGEX is used in hack/get-build.sh and KUBE_CI_VERSION_DASHED_REGEX is used in cluster/gce/util.sh,
 # make sure to remove these vars when not used anymore
-#                              v1                .26               .0              -rc            .0              (  .1                +014f      )?
-export KUBE_CI_VERSION_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)-[a-zA-Z0-9]+\\.(0|[1-9][0-9]*)(\\.(0|[1-9][0-9]*)\\+[-0-9a-z]*)?$"
-export KUBE_CI_VERSION_DASHED_REGEX="^v(0|[1-9][0-9]*)-(0|[1-9][0-9]*)-(0|[1-9][0-9]*)-[a-zA-Z0-9]+-(0|[1-9][0-9]*)(-(0|[1-9][0-9]*)\\+[-0-9a-z]*)?"
+#                              v1                .26               .0              -(rc            .0                .)?1              (  +014f      )?
+export KUBE_CI_VERSION_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)-([a-zA-Z0-9]+\\.(0|[1-9][0-9]*)\\.)?(0|[1-9][0-9]*)(\\+[-0-9a-z]*)?$"
+export KUBE_CI_VERSION_DASHED_REGEX="^v(0|[1-9][0-9]*)-(0|[1-9][0-9]*)-(0|[1-9][0-9]*)-([a-zA-Z0-9]+-(0|[1-9][0-9]*)-)?(0|[1-9][0-9]*)(\\+[-0-9a-z]*)?"
 
 # Generate kubeconfig data for the created cluster.
 # Assumed vars:

cluster/get-kube.sh

@@ -72,8 +72,8 @@ KUBERNETES_CI_RELEASE_URL="${KUBERNETES_CI_RELEASE_URL:-${KUBERNETES_RELEASE_URL
 KUBERNETES_RELEASE_URL="${KUBERNETES_RELEASE_URL:-https://dl.k8s.io}"
 
 KUBE_RELEASE_VERSION_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(-([a-zA-Z0-9]+)\\.(0|[1-9][0-9]*))?$"
-#                       v1                .26               .0              -rc            .0              (   .0                +014f     )?
-KUBE_CI_VERSION_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)-[a-zA-Z0-9]+\\.(0|[1-9][0-9]*)(\\.(0|[1-9][0-9]*)\\+[-0-9a-z]*)?$"
+#                       v1                .26               .0              -(rc            .0                .)?0              (  +014f      )?
+KUBE_CI_VERSION_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)-([a-zA-Z0-9]+\\.(0|[1-9][0-9]*)\\.)?(0|[1-9][0-9]*)(\\+[-0-9a-z]*)?$"
 
 # Sets KUBE_VERSION variable if an explicit version number was provided (e.g. "v1.0.6",
 # "v1.2.0-alpha.1.881+376438b69c7612", or "v1.2.0-881+376438b69c7612") or resolves the "published" version