form upload hash from CI environment vars if not set

scripts/binary/upload-npm-package.coffee

@@ -73,6 +73,9 @@ uploadNpmPackage = (args = []) ->
   la(isNpmPackageFile(options.file),
     "invalid file to upload extension", options.file)
 
+  if not options.hash
+    options.hash = uploadUtils.formHashFromEnvironment()
+
   la(check.unemptyString(options.hash), "missing hash to give", options)
   la(check.unemptyString(options.version), "missing version", options)
 

scripts/binary/upload-unique-binary.coffee

@@ -76,6 +76,9 @@ uploadUniqueBinary = (args = []) ->
   la(isBinaryFile(options.file),
     "invalid file to upload extension", options.file)
 
+  if not options.hash
+    options.hash = uploadUtils.formHashFromEnvironment()
+
   la(check.unemptyString(options.hash), "missing hash to give", options)
   la(check.unemptyString(options.version), "missing version", options)
 

scripts/binary/util/upload.coffee

@@ -10,6 +10,16 @@ Promise = require("bluebird")
 {configFromEnvOrJsonFile, filenameToShellVariable} = require('@cypress/env-or-json-file')
 konfig  = require("../../../packages/server/lib/konfig")
 
+formHashFromEnvironment = () ->
+  env = process.env
+  if env.BUILDKITE
+    return "#{env.BUILDKITE_BRANCH}-#{env.BUILDKITE_COMMIT}-#{env.BUILDKITE_BUILD_NUMBER}"
+  if env.CIRCLE
+    return "#{env.CIRCLE_BRANCH}-#{env.CIRCLE_SHA1}-#{env.CIRCLE_BUILD_NUM}"
+  if env.APPVEYOR
+    return "#{env.APPVEYOR_REPO_BRANCH}-#{env.APPVEYOR_REPO_COMMIT}-#{env.APPVEYOR_BUILD_ID}"
+  throw new Error("Do not know how to form unique build hash on this CI")
+
 getS3Credentials = () ->
   ## gleb: fix this plzzzzzz
   old = process.cwd()
@@ -133,5 +143,6 @@ module.exports = {
   purgeDesktopAppFromCache,
   purgeDesktopAppAllPlatforms,
   getUploadNameByOs,
-  saveUrl
+  saveUrl,
+  formHashFromEnvironment
 }