Auto-update dependencies (#1017)

Produced via:
  `dep ensure -update knative.dev/test-infra`
/assign n3wscott
/cc n3wscott

Gopkg.lock

@@ -1323,14 +1323,14 @@
 
 [[projects]]
   branch = "master"
-  digest = "1:4ba0f80b3feed917d2c9a1aa79ea95836c3aef84589431cff77ffd01615a1150"
+  digest = "1:f0fb577e7a666886e560755c78e19b56b23303575677a9beca899316eb6a137c"
   name = "knative.dev/test-infra"
   packages = [
     "scripts",
     "tools/dep-collector",
   ]
   pruneopts = "UT"
-  revision = "d5990f0e5a05d5819a40ad3b4de6227406850b48"
+  revision = "5779f9c9458d0a85f734c0cad43c1510aa00b498"
 
 [[projects]]
   digest = "1:8730e0150dfb2b7e173890c8b9868e7a273082ef8e39f4940e3506a481cf895c"

vendor/knative.dev/test-infra/scripts/library.sh

@@ -597,14 +597,19 @@ function get_canonical_path() {
   echo "$(cd ${path%/*} && echo $PWD/${path##*/})"
 }
 
-# Returns whether the current branch is a release branch.
-function is_release_branch() {
+# Returns the current branch.
+function current_branch() {
   local branch_name=""
   # Get the branch name from Prow's env var, see https://github.com/kubernetes/test-infra/blob/master/prow/jobs.md.
   # Otherwise, try getting the current branch from git.
   (( IS_PROW )) && branch_name="${PULL_BASE_REF:-}"
   [[ -z "${branch_name}" ]] && branch_name="$(git rev-parse --abbrev-ref HEAD)"
-  [[ ${branch_name} =~ ^release-[0-9\.]+$ ]]
+  echo "${branch_name}"
+}
+
+# Returns whether the current branch is a release branch.
+function is_release_branch() {
+  [[ $(current_branch) =~ ^release-[0-9\.]+$ ]]
 }
 
 # Returns the URL to the latest manifest for the given Knative project.
@@ -615,19 +620,23 @@ function get_latest_knative_yaml_source() {
   local yaml_name="$2"
   # If it's a release branch, the yaml source URL should point to a specific version.
   if is_release_branch; then
-    # Get the latest tag name for the current branch, which is likely formatted as v0.5.0
-    local tag_name="$(git describe --tags --abbrev=0)"
-    # The given repo might not have this tag, so we need to find its latest release manifest with the same major&minor version.
-    local major_minor="$(echo ${tag_name} | cut -d. -f1-2)"
-    local yaml_source_path="$(gsutil ls gs://knative-releases/${repo_name}/previous/${major_minor}.*/${yaml_name}.yaml \
+    # Extract the release major&minor version from the branch name.
+    local branch_name="$(current_branch)"
+    local major_minor="${branch_name##release-}"
+    # Find the latest release manifest with the same major&minor version.
+    local yaml_source_path="$(
+      gsutil ls gs://knative-releases/${repo_name}/previous/v${major_minor}.*/${yaml_name}.yaml 2> /dev/null \
       | sort \
       | tail -n 1 \
       | cut -b6-)"
-    echo "https://storage.googleapis.com/${yaml_source_path}"
-  # If it's not a release branch, the yaml source URL should be nightly build.
-  else
-    echo "https://storage.googleapis.com/knative-nightly/${repo_name}/latest/${yaml_name}.yaml"
+    # The version does exist, return it.
+    if [[ -n "${yaml_source_path}" ]]; then
+      echo "https://storage.googleapis.com/${yaml_source_path}"
+      return
+    fi
+    # Otherwise, fall back to nightly.
   fi
+  echo "https://storage.googleapis.com/knative-nightly/${repo_name}/latest/${yaml_name}.yaml"
 }
 
 # Initializations that depend on previous functions.