From b3146f0655f96ddf0c342fd0c9298f63b38d6b4c Mon Sep 17 00:00:00 2001
From: Ryan Zimmerman <opensrc@ryanzim.com>
Date: Mon, 31 Oct 2022 15:06:31 -0400
Subject: [PATCH] Run copy*() filter before running fs.stat() on items (#971)

Fixes #965
---
 lib/copy/copy-sync.js | 12 ++----------
 lib/copy/copy.js      | 35 +++++++++++++++++++----------------
 2 files changed, 21 insertions(+), 26 deletions(-)

diff --git a/lib/copy/copy-sync.js b/lib/copy/copy-sync.js
index 551abe0c..30e95222 100644
--- a/lib/copy/copy-sync.js
+++ b/lib/copy/copy-sync.js
@@ -26,21 +26,12 @@ function copySync (src, dest, opts) {
 
   const { srcStat, destStat } = stat.checkPathsSync(src, dest, 'copy', opts)
   stat.checkParentPathsSync(src, srcStat, dest, 'copy')
-  return handleFilterAndCopy(destStat, src, dest, opts)
-}
-
-function handleFilterAndCopy (destStat, src, dest, opts) {
   if (opts.filter && !opts.filter(src, dest)) return
   const destParent = path.dirname(dest)
   if (!fs.existsSync(destParent)) mkdirsSync(destParent)
   return getStats(destStat, src, dest, opts)
 }
 
-function startCopy (destStat, src, dest, opts) {
-  if (opts.filter && !opts.filter(src, dest)) return
-  return getStats(destStat, src, dest, opts)
-}
-
 function getStats (destStat, src, dest, opts) {
   const statSync = opts.dereference ? fs.statSync : fs.lstatSync
   const srcStat = statSync(src)
@@ -121,8 +112,9 @@ function copyDir (src, dest, opts) {
 function copyDirItem (item, src, dest, opts) {
   const srcItem = path.join(src, item)
   const destItem = path.join(dest, item)
+  if (opts.filter && !opts.filter(srcItem, destItem)) return
   const { destStat } = stat.checkPathsSync(srcItem, destItem, 'copy', opts)
-  return startCopy(destStat, srcItem, destItem, opts)
+  return getStats(destStat, srcItem, destItem, opts)
 }
 
 function onLink (destStat, src, dest, opts) {
diff --git a/lib/copy/copy.js b/lib/copy/copy.js
index 09d53dfd..53423e0e 100644
--- a/lib/copy/copy.js
+++ b/lib/copy/copy.js
@@ -35,8 +35,12 @@ function copy (src, dest, opts, cb) {
     const { srcStat, destStat } = stats
     stat.checkParentPaths(src, srcStat, dest, 'copy', err => {
       if (err) return cb(err)
-      if (opts.filter) return handleFilter(checkParentDir, destStat, src, dest, opts, cb)
-      return checkParentDir(destStat, src, dest, opts, cb)
+      runFilter(src, dest, opts, (err, include) => {
+        if (err) return cb(err)
+        if (!include) return cb()
+
+        checkParentDir(destStat, src, dest, opts, cb)
+      })
     })
   })
 }
@@ -53,16 +57,10 @@ function checkParentDir (destStat, src, dest, opts, cb) {
   })
 }
 
-function handleFilter (onInclude, destStat, src, dest, opts, cb) {
-  Promise.resolve(opts.filter(src, dest)).then(include => {
-    if (include) return onInclude(destStat, src, dest, opts, cb)
-    return cb()
-  }, error => cb(error))
-}
-
-function startCopy (destStat, src, dest, opts, cb) {
-  if (opts.filter) return handleFilter(getStats, destStat, src, dest, opts, cb)
-  return getStats(destStat, src, dest, opts, cb)
+function runFilter (src, dest, opts, cb) {
+  if (!opts.filter) return cb(null, true)
+  Promise.resolve(opts.filter(src, dest))
+    .then(include => cb(null, include), error => cb(error))
 }
 
 function getStats (destStat, src, dest, opts, cb) {
@@ -178,12 +176,17 @@ function copyDirItems (items, src, dest, opts, cb) {
 function copyDirItem (items, item, src, dest, opts, cb) {
   const srcItem = path.join(src, item)
   const destItem = path.join(dest, item)
-  stat.checkPaths(srcItem, destItem, 'copy', opts, (err, stats) => {
+  runFilter(srcItem, destItem, opts, (err, include) => {
     if (err) return cb(err)
-    const { destStat } = stats
-    startCopy(destStat, srcItem, destItem, opts, err => {
+    if (!include) return copyDirItems(items, src, dest, opts, cb)
+
+    stat.checkPaths(srcItem, destItem, 'copy', opts, (err, stats) => {
       if (err) return cb(err)
-      return copyDirItems(items, src, dest, opts, cb)
+      const { destStat } = stats
+      getStats(destStat, srcItem, destItem, opts, err => {
+        if (err) return cb(err)
+        return copyDirItems(items, src, dest, opts, cb)
+      })
     })
   })
 }