Handle EISDIR from lchown in node <10.6

Fix #20

chownr.js

@@ -7,6 +7,36 @@ const LCHOWN = fs.lchown ? 'lchown' : 'chown'
 /* istanbul ignore next */
 const LCHOWNSYNC = fs.lchownSync ? 'lchownSync' : 'chownSync'
 
+const needEISDIRHandled = fs.lchown &&
+  !process.version.match(/v1[1-9]+\./) &&
+  !process.version.match(/v10\.[6-9]/)
+
+/* istanbul ignore next */
+const handleEISDIR =
+  needEISDIRHandled ? (path, uid, gid, cb) => er => {
+    // Node prior to v10 had a very questionable implementation of
+    // fs.lchown, which would always try to call fs.open on a directory
+    // Fall back to fs.chown in those cases.
+    if (!er || er.code !== 'EISDIR')
+      cb(er)
+    else
+      fs.chown(path, uid, gid, cb)
+  }
+  : (_, __, ___, cb) => cb
+
+/* istanbul ignore next */
+const handleEISDirSync =
+  needEISDIRHandled ? (path, uid, gid) => {
+    try {
+      return fs[LCHOWNSYNC](path, uid, gid)
+    } catch (er) {
+      if (er.code !== 'EISDIR')
+        throw er
+      fs.chownSync(path, uid, gid)
+    }
+  }
+  : fs[LCHOWNSYNC]
+
 // fs.readdir could only accept an options object as of node v6
 const nodeVersion = process.version
 let readdir = (path, options, cb) => fs.readdir(path, options, cb)
@@ -28,10 +58,13 @@ const chownrKid = (p, child, uid, gid, cb) => {
     chownr(path.resolve(p, child.name), uid, gid, er => {
       if (er)
         return cb(er)
-      fs[LCHOWN](path.resolve(p, child.name), uid, gid, cb)
+      const cpath = path.resolve(p, child.name)
+      fs[LCHOWN](cpath, uid, gid, handleEISDIR(cpath, uid, gid, cb))
     })
-  } else
-    fs[LCHOWN](path.resolve(p, child.name), uid, gid, cb)
+  } else {
+    const cpath = path.resolve(p, child.name)
+    fs[LCHOWN](cpath, uid, gid, handleEISDIR(cpath, uid, gid, cb))
+  }
 }
 
 
@@ -41,14 +74,18 @@ const chownr = (p, uid, gid, cb) => {
     // or doesn't exist.  give up.
     if (er && er.code !== 'ENOTDIR' && er.code !== 'ENOTSUP')
       return cb(er)
-    if (er || !children.length) return fs[LCHOWN](p, uid, gid, cb)
+    if (er || !children.length)
+      return fs[LCHOWN](p, uid, gid, handleEISDIR(p, uid, gid, cb))
 
     let len = children.length
     let errState = null
     const then = er => {
-      if (errState) return
-      if (er) return cb(errState = er)
-      if (-- len === 0) return fs[LCHOWN](p, uid, gid, cb)
+      if (errState)
+        return
+      if (er)
+        return cb(errState = er)
+      if (-- len === 0)
+        return fs[LCHOWN](p, uid, gid, handleEISDIR(p, uid, gid, cb))
     }
 
     children.forEach(child => chownrKid(p, child, uid, gid, then))
@@ -65,7 +102,7 @@ const chownrKidSync = (p, child, uid, gid) => {
   if (child.isDirectory())
     chownrSync(path.resolve(p, child.name), uid, gid)
 
-  fs[LCHOWNSYNC](path.resolve(p, child.name), uid, gid)
+  handleEISDirSync(path.resolve(p, child.name), uid, gid)
 }
 
 const chownrSync = (p, uid, gid) => {
@@ -74,14 +111,14 @@ const chownrSync = (p, uid, gid) => {
     children = readdirSync(p, { withFileTypes: true })
   } catch (er) {
     if (er && er.code === 'ENOTDIR' && er.code !== 'ENOTSUP')
-      return fs[LCHOWNSYNC](p, uid, gid)
+      return handleEISDirSync(p, uid, gid)
     throw er
   }
 
   if (children.length)
     children.forEach(child => chownrKidSync(p, child, uid, gid))
 
-  return fs[LCHOWNSYNC](p, uid, gid)
+  return handleEISDirSync(p, uid, gid)
 }
 
 module.exports = chownr