Use relative roots for the name of the cached haste map

Author: rubennorte

CHANGELOG.md

@@ -7,7 +7,7 @@
 ### Fixes
 
 - `[jest-haste-map]` [**BREAKING**] Replace internal data structures to improve performance ([#6960](https://github.com/facebook/jest/pull/6960))
-- `[jest-haste-map]` Used relative paths internally to allow remote caching ([#7020](https://github.com/facebook/jest/pull/7020))
+- `[jest-haste-map]` Use relative paths to allow remote caching ([#7020](https://github.com/facebook/jest/pull/7020))
 - `[jest-haste-map]` Do not visit again files with the same sha-1 ([#6990](https://github.com/facebook/jest/pull/6990))
 - `[jest-jasmine2]` Fix memory leak in Error objects hold by the framework ([#6965](https://github.com/facebook/jest/pull/6965))
 - `[jest-haste-map]` Fixed Haste whitelist generation for scoped modules on Windows ([#6980](https://github.com/facebook/jest/pull/6980))

packages/jest-haste-map/src/index.js

@@ -258,7 +258,9 @@ class HasteMap extends EventEmitter {
       this._options.cacheDirectory,
       `haste-map-${this._options.name}`,
       VERSION,
-      this._options.roots.join(':'),
+      this._options.roots
+        .map(root => path.relative(options.rootDir, root))
+        .join(':'),
       this._options.extensions.join(':'),
       this._options.platforms.join(':'),
       this._options.computeSha1.toString(),