Better error message for cygwin DNS issue

cli.js

@@ -91,9 +91,20 @@ function errorHandler (er) {
     return rm(npm.tmp, function (er) { process.exit(0) })
   }
   log.error(er)
-  log.error("try running: 'npm help "+command+"'")
-  log.error("Report this *entire* log at <http://github.com/isaacs/npm/issues>")
-  log.error("or email it to <[email protected]>")
+  if (er.message.trim() === "ECONNREFUSED, Could not contact DNS servers") {
+    log.error(["If you are using Cygwin, please set up your /etc/resolv.conf"
+              ,"See step 3 in this wiki page:"
+              ,"    http://github.com/ry/node/wiki/Building-node.js-on-Cygwin-%28Windows%29"
+              ,"If you are not using Cygwin, please report this"
+              ,"at <http://github.com/isaacs/npm/issues>"
+              ,"or email it to <[email protected]>"
+              ].join("\n"))
+  } else {
+    log.error(["try running: 'npm help "+command+"'"
+              ,"Report this *entire* log at <http://github.com/isaacs/npm/issues>"
+              ,"or email it to <[email protected]>"
+              ].join("\n"))
+  }
   rm(npm.tmp, function (er) { process.exit(1) })
 }
 

package.json

@@ -1,6 +1,6 @@
 { "name" : "npm"
 , "description" : "A package manager for node"
-, "version" : "0.1.27-6"
+, "version" : "0.1.27-7"
 , "homepage" : "http://npmjs.org/"
 , "author" : "Isaac Z. Schlueter <[email protected]> (http://blog.izs.me)"
 , "contributors" :