From 5406472d651e4f27a26e6443c4117aa9bedb9c6b Mon Sep 17 00:00:00 2001
From: muxator <a.mux@inwind.it>
Date: Wed, 22 Aug 2018 01:14:30 +0200
Subject: [PATCH] AbsolutePaths: makeAbsolute() computes an absolute path from
 a relative one

The base is assumed to be exports.findEtherpadRoot(), without depending on
process.cwd.
---
 src/node/utils/AbsolutePaths.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/node/utils/AbsolutePaths.js b/src/node/utils/AbsolutePaths.js
index 3a7e60f0d..6d67bd15d 100644
--- a/src/node/utils/AbsolutePaths.js
+++ b/src/node/utils/AbsolutePaths.js
@@ -114,3 +114,24 @@ exports.findEtherpadRoot = function() {
   absPathLogger.error(`To run, Etherpad has to identify an absolute base path. This is not: "${etherpadRoot}"`);
   process.exit(1);
 };
+
+/**
+ * Receives a filesystem path in input. If the path is absolute, returns it
+ * unchanged. If the path is relative, an absolute version of it is returned,
+ * built prepending exports.findEtherpadRoot() to it.
+ *
+ * @param  {string} somePath - an absolute or relative path
+ * @return {string} An absolute path. If the input path was already absolute,
+ *                  it is returned unchanged. Otherwise it is interpreted
+ *                  relative to exports.root.
+ */
+exports.makeAbsolute = function(somePath) {
+  if (path.isAbsolute(somePath)) {
+    return somePath;
+  }
+
+  const rewrittenPath = path.normalize(path.join(exports.findEtherpadRoot(), somePath));
+
+  absPathLogger.debug(`Relative path "${somePath}" can be rewritten to "${rewrittenPath}"`);
+  return rewrittenPath;
+};