[patch-announce] Move to golang tool

Remove the bash implementation, move to the golang based tool.

The tool currently still shells out and has some external dependencies.
Therefore we, for now, just `go run` it in the `k8s-cloud-builder`
images, where we have all the tools available.

announce-patch

@@ -43,14 +43,15 @@
 #+     --freeze-date           - The date we will freeze the branch and will not accept
 #+                               cherry-picks anymore.
 #+     --cut-date              - The date we will cut and publish the release.
-#+     --from-name             - The sender's name.
-#+     --from-email            - The sender's email address. Will also be used as a
+#+     --sender-name           - The sender's name.
+#+     --sender-email          - The sender's email address. Will also be used as a
 #+                               receiver when not in nomock mode.
 #+     [--tail]                - Stays attached to the cloud build process and streams
 #+                               in the logs
 #+     [--k8s-git-url]         - The git URL to clone kubernetes/kubernetes from.
 #+     [--release-git-url]     - The git URL to clone kubernetes/release from.
 #+     [--release-git-branch]  - The branch of kubernetes/release to use.
+#+     [--log-level]           - Set the loglevel for the patch announcement tool
 #+
 #+ ENVIRONMENT
 #+     The GCP project can be changed by setting the PROJECT environment
@@ -116,7 +117,9 @@ main() {
     return 1
   fi
 
-  local subst=()
+  local subst=(
+    '_NOMOCK=false'
+  )
   local opts=(
     '--no-source'
     "--config=${BASE_ROOT}/gcb/patch-announce/cloudbuild.yaml"
@@ -126,18 +129,19 @@ main() {
   subst+=( "_K8S_GIT_BRANCH=${branch_name}" )
   subst+=( "_FREEZE_DATE=$( flag_or_env_or_default 'freeze_date' )" )
   subst+=( "_CUT_DATE=$( flag_or_env_or_default 'cut_date' )" )
-  subst+=( "_FROM_NAME=$( flag_or_env_or_default 'from_name' )" )
-  subst+=( "_FROM_EMAIL=$( flag_or_env_or_default 'from_email' )" )
+  subst+=( "_SENDER_NAME=$( flag_or_env_or_default 'sender_name' )" )
+  subst+=( "_SENDER_EMAIL=$( flag_or_env_or_default 'sender_email' )" )
 
   # optional flags
   subst+=( "_K8S_GIT_URL=$( flag_or_env_or_default 'k8s_git_url' 'https://github.com/kubernetes/kubernetes' )" )
   subst+=( "_RELEASE_GIT_URL=$( flag_or_env_or_default 'release_git_url' 'https://github.com/kubernetes/release' )" )
   subst+=( "_RELEASE_GIT_BRANCH=$( flag_or_env_or_default 'release_git_branch' 'master' )" )
+  subst+=( "_LOG_LEVEL=$( flag_or_env_or_default 'log-level' 'info' )" )
 
   # shellcheck disable=2154
   # ... because that is set by magick when sourcing common.sh
   if ((FLAGS_nomock)) ; then
-    subst+=( "_RUN_TYPE=nomock" )
+    subst+=( "_NOMOCK=true" )
   fi
 
   # shellcheck disable=2154

gcb/patch-announce/cloudbuild.yaml

@@ -41,19 +41,49 @@ steps:
 - id: prepare-and-send
   name: "gcr.io/${PROJECT_ID}/k8s-cloud-builder"
   env:
-  - "REL_MGR_NAME=${_REL_MGR_NAME}"
-  - "REL_MGR_EMAIL=${_REL_MGR_EMAIL}"
-  - "REL_MGR_SLACK=${_REL_MGR_SLACK}"
-  - "FROM_NAME=${_FROM_NAME}"
-  - "FROM_EMAIL=${_FROM_EMAIL}"
+  - "SENDER_NAME=${_SENDER_NAME}"
+  - "SENDER_EMAIL=${_SENDER_EMAIL}"
   - "FREEZE_DATE=${_FREEZE_DATE}"
   - "CUT_DATE=${_CUT_DATE}"
-  - "RUN_TYPE=${_RUN_TYPE}"
+  - "NOMOCK=${_NOMOCK}"
+  - "LOG_LEVEL=${_LOG_LEVEL}"
   secretEnv:
   - GITHUB_TOKEN
   - SENDGRID_API_KEY
+  dir: "go/src/k8s.io/release"
+  entrypoint: bash
   args:
-  - go/src/k8s.io/release/patch-release/announce
+  - -c
+  - |
+    set -e
+    set -u
+    set -o pipefail
+
+    export GOPATH="/workspace/go"
+    export GOBIN="$${GOPATH}/bin"
+    export PATH="$${PATH}:$${GOBIN}"
+
+    # TODO: Until we've switched away from the shell release note tool, we
+    # still need this binary in the PATH
+    go install ./cmd/blocking-testgrid-tests
+
+    # Notes:
+    #   - GITHUB_TOKEN & SENDGRID_API_KEY need to be picked up by the
+    #     application from the env, we don't want to log or pass those
+    #     sensitive values as flags.
+    #   - Once we've removed all external dependencies and the tool does not
+    #     shell out any more, we can also compile, bake and release this tool
+    #     as a container image and use that instead of `go run`ing it.
+    go run ./cmd/krel \
+      patch-announce \
+        --repo=../kubernetes \
+        --release-repo=. \
+        --sender-name="$${SENDER_NAME}" \
+        --sender-email="$${SENDER_EMAIL}" \
+        --cut-date="$${CUT_DATE}" \
+        --freeze-date="$${FREEZE_DATE}" \
+        --log-level="$${LOG_LEVEL}" \
+        --nomock="$${NOMOCK}"
 
 substitutions:
   # The branch of k/kubernetes to check out, the branch to announce a patch release for (e.g.: release-1.15)
@@ -63,20 +93,16 @@ substitutions:
   # Date of planned cut, ISO 8601 (e.g.: 2019-12-11)
   _CUT_DATE:           null
   # The mail sender's name. Will also be used as a receipient in mock mode. (e.g.: "Jane Doe")
-  _FROM_NAME:          null
+  _SENDER_NAME:        null
   # The mail sender's email. Will also be used as a receipient in mock mode. (e.g.: jane.doe@example.org")
-  _FROM_EMAIL:         null
-  # For the real run, set to 'nomock' (e.g.: "mock" or "nomock")
-  _RUN_TYPE:           'mock'
+  _SENDER_EMAIL:       null
+  # For the real run, set to 'nomock' (e.g.: 0,1,f,t,false,true)
+  _NOMOCK:             '0'
   # git-clone'able URL for k/kubernetes
   _K8S_GIT_URL:        https://github.com/kubernetes/kubernetes
   # git-clone'able URL for k/release
   _RELEASE_GIT_URL:    https://github.com/kubernetes/release
   # The branch of k/release to check out
   _RELEASE_GIT_BRANCH: master
-  # For the email message: the name of the group to contact
-  _REL_MGR_NAME:       'Kubernetes Release Managers'
-  # For the email message: the email of the group to contact
-  _REL_MGR_EMAIL:      'release-managers@kubernetes.io'
-  # For the email message: the slack channel of the group to contact
-  _REL_MGR_SLACK:      'sig-release'
+  # The log level to be used with the patch-announce tool
+  _LOG_LEVEL:          info