attempt-backport: enable label removal for Current lines

Refs: #77
PR-URL: #90

lib/node-repo.js

@@ -61,6 +61,30 @@ function updatePrWithLabels (options, labels) {
   })
 }
 
+function removeLabelFromPR (options, label) {
+  // no need to request github if we didn't resolve a label
+  if (!label) {
+    return
+  }
+
+  options.logger.debug('Trying to remove label: ' + label)
+
+  githubClient.issues.removeLabel({
+    user: options.owner,
+    repo: options.repo,
+    number: options.prId,
+    name: label
+  }, (err) => {
+    if (err) {
+      if (err.code === 404) return options.logger.info('Label to remove did not exist, bailing ' + label)
+
+      return options.logger.error(err, 'Error while removing a label')
+    }
+
+    options.logger.info('Removed a label ' + label)
+  })
+}
+
 function fetchExistingLabels (options, cb) {
   const cacheKey = `${options.owner}:${options.repo}`
 
@@ -93,6 +117,7 @@ function itemsInCommon (arr1, arr2) {
   return arr1.filter((item) => arr2.indexOf(item) !== -1)
 }
 
+exports.removeLabelFromPR = removeLabelFromPR
 exports.updatePrWithLabels = updatePrWithLabels
 exports.resolveLabelsThenUpdatePr = deferredResolveLabelsThenUpdatePr
 

scripts/attempt-backport.js

@@ -3,7 +3,9 @@
 const child_process = require('child_process')
 const debug = require('debug')('attempt-backport')
 const request = require('request')
-const updatePrWithLabels = require('../lib/node-repo').updatePrWithLabels
+const node_repo = require('../lib/node-repo')
+const updatePrWithLabels = node_repo.updatePrWithLabels
+const removeLabelFromPR = node_repo.removeLabelFromPR
 
 const enabledRepos = ['node']
 const queue = []
@@ -193,7 +195,11 @@ function attemptBackport(options, version, isLTS, cb) {
     options.logger.debug(`attempting a backport to v${version}...`)
     const cp = wrapCP('git', ['am'], { stdio: 'pipe' }, function done() {
       // Success!
-      if (isLTS) updatePrWithLabels(options, [`lts-watch-v${version}.x`])
+      if (isLTS) {
+        updatePrWithLabels(options, [`lts-watch-v${version}.x`])
+      } else {
+        removeLabelFromPR(options, `dont-land-on-v${version}.x`)
+      }
 
       setImmediate(() => {
         options.logger.debug(`backport to v${version} successful`)