Add error messages for failed version lookups (when nodejs.org returns partial/no results. Resolves #1064.

Author: coreybutler

src/go.mod

@@ -8,7 +8,6 @@ require (
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/coreybutler/go-fsutil v1.2.0
 	github.com/coreybutler/go-where v1.0.2
-	github.com/gonutz/w32/v2 v2.8.1
 	github.com/olekukonko/tablewriter v0.0.5
 	github.com/saintfish/chardet v0.0.0-20230101081208-5e3ef4b5456d
 	golang.org/x/sys v0.1.0

src/go.sum

@@ -4,8 +4,6 @@ github.com/coreybutler/go-fsutil v1.2.0 h1:kbm62NSofawglUppEOhpHC3NDf/J7ZpguBirB
 github.com/coreybutler/go-fsutil v1.2.0/go.mod h1:B+6ufEkkRZgFwyR2sHEVG9dMzVBU3GbyGyYmCq7YkEk=
 github.com/coreybutler/go-where v1.0.2 h1:Omit67KeTtKpvSJjezVxnVD4qMtvlXDlItiKpVCdcl4=
 github.com/coreybutler/go-where v1.0.2/go.mod h1:IqV4saJiDXdNJURfTfVRywDHvY1IG5F+GXb2kmnmEe8=
-github.com/gonutz/w32/v2 v2.8.1 h1:fTAzhg35iCGWqroImF18+A8GbI3MdXcTYuhvpBpd5CM=
-github.com/gonutz/w32/v2 v2.8.1/go.mod h1:MgtHx0AScDVNKyB+kjyPder4xIi3XAcHS6LDDU2DmdE=
 github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=

src/node/node.go

@@ -2,14 +2,15 @@ package node
 
 import (
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"nvm/arch"
 	"nvm/file"
 	"nvm/web"
+	"os"
 	"os/exec"
 	"regexp"
 	"strings"
-	"os"
 
 	// "../semver"
 	"github.com/blang/semver"
@@ -208,13 +209,20 @@ func GetAvailable() ([]string, []string, []string, []string, []string, map[strin
 
 	// Check the service to make sure the version is available
 	text := web.GetRemoteTextFile(url)
+	if len(text) == 0 {
+		fmt.Println("Error retrieving version list: \"" + url + "\" returned blank results. This can happen when the remote file is being updated. Please try again in a few minutes.")
+		os.Exit(0)
+	}
 
 	// Parse
 	var data = make([]map[string]interface{}, 0)
-	json.Unmarshal([]byte(text), &data)
+	err := json.Unmarshal([]byte(text), &data)
+	if err != nil {
+		fmt.Printf("Error retrieving versions from \"%s\": %v", url, err.Error())
+		os.Exit(1)
+	}
 
 	for _, element := range data {
-
 		var version = element["version"].(string)[1:]
 		all = append(all, version)
 

src/nvm.go

@@ -1138,8 +1138,12 @@ func checkLocalEnvironment() {
 		}
 	} else {
 		if fileInfo.Mode()&os.ModeSymlink != 0 {
-			targetPath, _ := os.Readlink(symlink)
-			targetFileInfo, _ := os.Lstat(targetPath)
+			targetPath, err := os.Readlink(symlink)
+			if err != nil {
+				fmt.Println(err)
+			}
+
+			targetFileInfo, err := os.Lstat(targetPath)
 
 			if !targetFileInfo.Mode().IsDir() {
 				problems = append(problems, "NVM_SYMLINK is a symlink linking to a file instead of a directory.")
@@ -1312,7 +1316,14 @@ func getLatest() string {
 }
 
 func getLTS() string {
-	_, ltsList, _, _, _, _ := node.GetAvailable()
+	all, ltsList, current, stable, unstable, npm := node.GetAvailable()
+	fmt.Println(all)
+	fmt.Println(ltsList)
+	fmt.Println(current)
+	fmt.Println(stable)
+	fmt.Println(unstable)
+	fmt.Println(npm)
+	// _, ltsList, _, _, _, _ := node.GetAvailable()
 	// ltsList has already been numerically sorted
 	return ltsList[0]
 }

src/web/web.go

@@ -321,6 +321,11 @@ func GetRemoteTextFile(url string) string {
 		os.Exit(1)
 	}
 
+	if response.StatusCode != 200 {
+		fmt.Printf("Error retrieving \"%s\": HTTP Status %v\n", url, response.StatusCode)
+		os.Exit(0)
+	}
+
 	defer response.Body.Close()
 
 	contents, readerr := ioutil.ReadAll(response.Body)