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utility.go
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utility.go
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package main
import (
"context"
"crypto/sha256"
"encoding/hex"
"fmt"
"github.com/goccy/go-json"
"io"
"net/http"
"os"
"os/exec"
"path/filepath"
"regexp"
"strconv"
"strings"
"sync"
"time"
)
const (
ansiColor = "\033[36m"
ansiNoColor = "\033[0m"
)
// Spinner struct with thread-safe mechanisms
type Spinner struct {
frames []rune
index int
mu sync.Mutex
stopChan chan struct{}
speed time.Duration
speedMu sync.Mutex
}
// NewSpinner creates a new Spinner instance
func NewSpinner(frames []rune) *Spinner {
return &Spinner{
frames: frames,
index: 0,
stopChan: make(chan struct{}),
speed: 80 * time.Millisecond, // default interval
}
}
// Start begins the spinner in a new goroutine
func (s *Spinner) Start() {
go func() {
for {
select {
case <-s.stopChan:
return
default:
s.mu.Lock()
fmt.Printf("%s%c%s\r", ansiColor, s.frames[s.index], ansiNoColor)
s.index = (s.index + 1) % len(s.frames)
s.mu.Unlock()
time.Sleep(s.getSpeed())
}
}
}()
}
// Stop stops the spinner
func (s *Spinner) Stop() {
close(s.stopChan)
}
// SetSpeed sets the spinner speed
func (s *Spinner) SetSpeed(speed time.Duration) {
s.speedMu.Lock()
s.speed = speed
s.speedMu.Unlock()
}
// getSpeed gets the spinner speed
func (s *Spinner) getSpeed() time.Duration {
s.speedMu.Lock()
defer s.speedMu.Unlock()
return s.speed
}
// fetchBinaryFromURLToDest downloads the file from the given URL to the specified destination and checks the checksum if provided.
func fetchBinaryFromURLToDest(ctx context.Context, url, checksum string, destination string) (string, error) {
resp, err := http.Get(url)
if err != nil {
return "", err
}
defer resp.Body.Close()
// Ensure the parent directory exists
if err := os.MkdirAll(filepath.Dir(destination), 0755); err != nil {
return "", fmt.Errorf("failed to create parent directories for %s: %v", destination, err)
}
tempFile := destination + ".tmp"
out, err := os.Create(tempFile)
if err != nil {
return "", err
}
defer out.Close()
spinner := NewSpinner([]rune{
'⠁', '⠂', '⠄', '⡀', '⡈', '⡐', '⡠', '⣀',
'⣁', '⣂', '⣄', '⣌', '⣔', '⣤', '⣥', '⣦',
'⣮', '⣶', '⣷', '⣿', '⡿', '⠿', '⢟', '⠟',
'⡛', '⠛', '⠫', '⢋', '⠋', '⠍', '⡉', '⠉',
'⠑', '⠡', '⢁', // '🕛', '🕧', '🕐', '🕜', '🕑', '🕝', '🕒', '🕞', '🕓', '🕟', '🕔', '🕠', '🕕', '🕡', '🕖', '🕢', '🕗', '🕣', '🕘', '🕤', '🕙', '🕙', '🕚', '🕦',
})
spinner.Start()
defer spinner.Stop()
var downloaded int64
buf := make([]byte, 4096)
startTime := time.Now()
hash := sha256.New()
downloadLoop:
for {
select {
case <-ctx.Done():
_ = os.Remove(tempFile)
return "", ctx.Err()
default:
n, err := resp.Body.Read(buf)
if n > 0 {
if _, err := out.Write(buf[:n]); err != nil {
_ = os.Remove(tempFile)
return "", err
}
// Write to hash for checksum calculation
if _, err := hash.Write(buf[:n]); err != nil {
_ = os.Remove(tempFile)
return "", err
}
downloaded += int64(n)
elapsed := time.Since(startTime).Seconds()
speed := float64(downloaded) / elapsed // bytes per second
// Adjust spinner speed based on download speed
switch {
case speed > 1024*1024: // more than 1MB/s
spinner.SetSpeed(150 * time.Millisecond)
case speed > 512*1024: // more than 512KB/s
spinner.SetSpeed(100 * time.Millisecond)
case speed > 256*1024: // more than 256KB/s
spinner.SetSpeed(80 * time.Millisecond)
default:
spinner.SetSpeed(50 * time.Millisecond)
}
}
if err == io.EOF {
break downloadLoop
}
if err != nil {
_ = os.Remove(tempFile)
return "", err
}
}
}
// Final checksum verification
if checksum != "" {
calculatedChecksum := hex.EncodeToString(hash.Sum(nil))
if calculatedChecksum != checksum {
_ = os.Remove(tempFile)
return "", fmt.Errorf("checksum verification failed: expected %s, got %s", checksum, calculatedChecksum)
}
} else {
fmt.Println("Warning: No checksum exists for this binary in the metadata files, skipping verification.")
}
// Make a few corrections in case the downloaded binary is a nix object
if err := removeNixGarbageFoundInTheRepos(tempFile); err != nil {
_ = os.Remove(tempFile)
return "", err
}
if err := os.Rename(tempFile, destination); err != nil {
_ = os.Remove(tempFile)
return "", err
}
if err := os.Chmod(destination, 0755); err != nil {
_ = os.Remove(destination)
return "", fmt.Errorf("failed to set executable bit for %s: %v", destination, err)
}
return destination, nil
}
// removeDuplicates removes duplicate binaries from the list (used in ./install.go)
func removeDuplicates(binaries []string) []string {
seen := make(map[string]struct{})
result := []string{}
for _, binary := range binaries {
if _, ok := seen[binary]; !ok {
seen[binary] = struct{}{}
result = append(result, binary)
}
}
return result
}
func fetchJSON(url string, v interface{}) error {
spinner := NewSpinner([]rune{
'⠁', '⠂', '⠄', '⡀', '⡈', '⡐', '⡠', '⣀',
'⣁', '⣂', '⣄', '⣌', '⣔', '⣤', '⣥', '⣦',
'⣮', '⣶', '⣷', '⣿', '⡿', '⠿', '⢟', '⠟',
'⡛', '⠛', '⠫', '⢋', '⠋', '⠍', '⡉', '⠉',
'⠑', '⠡', '⢁', // '🕛', '🕧', '🕐', '🕜', '🕑', '🕝', '🕒', '🕞', '🕓', '🕟', '🕔', '🕠', '🕕', '🕡', '🕖', '🕢', '🕗', '🕣', '🕘', '🕤', '🕙', '🕙', '🕚', '🕦',
})
spinner.Start()
defer spinner.Stop()
response, err := http.Get(url)
if err != nil {
return fmt.Errorf("error fetching from %s: %v", url, err)
}
defer response.Body.Close()
body, err := io.ReadAll(response.Body)
if err != nil {
return fmt.Errorf("error reading from %s: %v", url, err)
}
if err := json.Unmarshal(body, v); err != nil {
return fmt.Errorf("error decoding from %s: %v", url, err)
}
return nil
}
// contanins will return true if the provided slice of []strings contains the word str
func contains(slice []string, str string) bool {
for _, v := range slice {
if v == str {
return true
}
}
return false
}
// fileExists checks if a file exists.
func fileExists(filePath string) bool {
_, err := os.Stat(filePath)
return !os.IsNotExist(err)
}
// isExecutable checks if the file at the specified path is executable.
func isExecutable(filePath string) bool {
info, err := os.Stat(filePath)
if err != nil {
return false
}
return info.Mode().IsRegular() && (info.Mode().Perm()&0o111) != 0
}
// listFilesInDir lists all files in a directory
func listFilesInDir(dir string) ([]string, error) {
entries, err := os.ReadDir(dir)
if err != nil {
return nil, err
}
files := make([]string, 0, len(entries))
for _, entry := range entries {
if !entry.IsDir() {
files = append(files, filepath.Join(dir, entry.Name()))
}
}
return files, nil
}
// validateProgramsFrom checks the validity of programs against a remote source
func validateProgramsFrom(installDir, trackerFile string, metadataURLs, programsToValidate []string) ([]string, error) {
remotePrograms, err := listBinaries(metadataURLs)
if err != nil {
return nil, fmt.Errorf("failed to list remote binaries: %w", err)
}
files, err := listFilesInDir(installDir)
if err != nil {
return nil, fmt.Errorf("failed to list files in %s: %w", installDir, err)
}
programsToValidate = removeDuplicates(programsToValidate)
validPrograms := make([]string, 0, len(programsToValidate))
// Inline function to check if a file is a symlink
isSymlink := func(filePath string) bool {
fileInfo, err := os.Lstat(filePath)
return err == nil && fileInfo.Mode()&os.ModeSymlink != 0
}
// Inline function to get the binary name or fall back to the original name
getBinaryName := func(file string) string {
binaryName, err := getBinaryNameFromTrackerFile(trackerFile, file)
if err != nil || binaryName == "" {
return file
}
return binaryName
}
// Inline function to validate a file against the remote program list
validate := func(file string) bool {
if isSymlink(file) {
return false
}
binaryName := getBinaryName(filepath.Base(file))
return contains(remotePrograms, binaryName)
}
if len(programsToValidate) == 0 {
// Validate all files in the directory
for _, file := range files {
if validate(file) {
validPrograms = append(validPrograms, filepath.Base(file))
}
}
} else {
// Validate only the specified programs
for _, program := range programsToValidate {
file := filepath.Join(installDir, program)
if validate(file) {
validPrograms = append(validPrograms, program)
}
}
}
return validPrograms, nil
}
// errorEncoder generates a unique error code based on the sum of ASCII values of the error message.
func errorEncoder(format string, args ...interface{}) int {
formattedErrorMessage := fmt.Sprintf(format, args...)
var sum int
for _, char := range formattedErrorMessage {
sum += int(char)
}
errorCode := sum % 256
fmt.Fprint(os.Stderr, formattedErrorMessage)
return errorCode
}
// errorOut prints the error message to stderr and exits the program with the error code generated by errorEncoder.
func errorOut(format string, args ...interface{}) {
os.Exit(errorEncoder(format, args...))
}
// GetTerminalWidth attempts to determine the width of the terminal.
// It first tries using "stty size", then "tput cols", and finally falls back to 80 columns.
func getTerminalWidth() int {
// Try using stty size
cmd := exec.Command("stty", "size")
cmd.Stdin = os.Stdin
out, err := cmd.Output()
if err == nil {
// stty size returns rows and columns
parts := strings.Split(strings.TrimSpace(string(out)), " ")
if len(parts) == 2 {
width, _ := strconv.Atoi(parts[1])
return width
}
}
// Fallback to tput cols
cmd = exec.Command("tput", "cols")
cmd.Stdin = os.Stdin
out, err = cmd.Output()
if err == nil {
width, _ := strconv.Atoi(strings.TrimSpace(string(out)))
return width
}
// Fallback to 80 columns
return 80
}
// NOTE: \n will always get cut off when using a truncate function, this may also happen to other formatting options
// truncateSprintf formats the string and truncates it if it exceeds the terminal width.
func truncateSprintf(indicator, format string, a ...interface{}) string {
// Format the string first
formatted := fmt.Sprintf(format, a...)
// Determine the truncation length & truncate the formatted string if it exceeds the available space
availableSpace := getTerminalWidth() - len(indicator)
if len(formatted) > availableSpace {
formatted = formatted[:availableSpace]
for strings.HasSuffix(formatted, ",") || strings.HasSuffix(formatted, ".") || strings.HasSuffix(formatted, " ") {
formatted = formatted[:len(formatted)-1]
}
formatted = fmt.Sprintf("%s%s", formatted, indicator) // Add the dots.
}
return formatted
}
// truncatePrintf is a drop-in replacement for fmt.Printf that truncates the input string if it exceeds a certain length.
func truncatePrintf(disableTruncation, addNewLine bool, format string, a ...interface{}) (n int, err error) {
if disableTruncation {
return fmt.Printf(format, a...)
}
if addNewLine {
return fmt.Println(truncateSprintf(indicator, format, a...))
}
return fmt.Print(truncateSprintf(indicator, format, a...))
}
// addToTrackerFile appends a binary name to the tracker file or updates an existing entry.
func addToTrackerFile(trackerFile, binaryName, installDir string) error {
tracker, err := readTrackerFile(trackerFile)
if err != nil {
return err
}
baseName := filepath.Base(binaryName)
tracker[baseName] = binaryName // Always update or add the entry
err = writeTrackerFile(trackerFile, tracker)
if err != nil {
return fmt.Errorf("could not write to tracker file: %w", err)
}
cleanupTrackerFile(trackerFile, installDir)
return nil
}
// getBinaryNameFromTrackerFile retrieves the full binary name from the tracker file based on the base name.
func getBinaryNameFromTrackerFile(trackerFile, baseName string) (string, error) {
baseName = filepath.Base(baseName)
tracker, err := readTrackerFile(trackerFile)
if err != nil {
return "", fmt.Errorf("could not read tracker file: %w", err)
}
if binaryName, exists := tracker[baseName]; exists {
return binaryName, nil
}
return "", fmt.Errorf("no match found for %s in tracker file", baseName)
}
// cleanupTrackerFile removes entries for binaries no longer present in the install directory.
func cleanupTrackerFile(trackerFile, installDir string) error {
tracker, err := readTrackerFile(trackerFile)
if err != nil {
return err
}
newTracker := make(map[string]string)
for baseName, repoPath := range tracker {
expectedPath := filepath.Join(installDir, baseName)
if _, err := os.Stat(expectedPath); os.IsNotExist(err) {
// If the file does not exist in the installDir, skip adding it to newTracker
continue
}
// Keep the entry if the file exists
newTracker[baseName] = repoPath
}
err = writeTrackerFile(trackerFile, newTracker)
if err != nil {
return fmt.Errorf("could not write to tracker file: %w", err)
}
return nil
}
// readTrackerFile reads the tracker file and returns the tracker map.
func readTrackerFile(trackerFile string) (map[string]string, error) {
file, err := os.Open(trackerFile)
if err != nil {
if os.IsNotExist(err) {
return make(map[string]string), nil // If the file doesn't exist, return an empty map
}
return nil, fmt.Errorf("could not open tracker file: %w", err)
}
defer file.Close()
tracker := make(map[string]string)
decoder := json.NewDecoder(file)
if err := decoder.Decode(&tracker); err != nil {
return nil, fmt.Errorf("could not decode tracker file: %w", err)
}
return tracker, nil
}
// writeTrackerFile writes the tracker map to the tracker file.
func writeTrackerFile(trackerFile string, tracker map[string]string) error {
file, err := os.OpenFile(trackerFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("could not open tracker file: %w", err)
}
defer file.Close()
encoder := json.NewEncoder(file)
if err := encoder.Encode(tracker); err != nil {
return fmt.Errorf("could not encode tracker file: %w", err)
}
return nil
}
// removeNixGarbageFoundInTheRepos corrects any /nix/store/ or /bin/ binary path in the file.
func removeNixGarbageFoundInTheRepos(filePath string) error {
// Read the entire file content
content, err := os.ReadFile(filePath)
if err != nil {
return fmt.Errorf("failed to read file %s: %v", filePath, err)
}
// Regex to match and remove the /nix/store/.../ prefix in the shebang line, preserving the rest of the path
nixShebangRegex := regexp.MustCompile(`^#!\s*/nix/store/[^/]+/`)
// Regex to match and remove the /nix/store/*/bin/ prefix in other lines
nixBinPathRegex := regexp.MustCompile(`/nix/store/[^/]+/bin/`)
// Split content by lines
lines := strings.Split(string(content), "\n")
// Flag to track if any corrections were made
correctionsMade := false
// Handle the shebang line separately if it exists and matches the nix pattern
if len(lines) > 0 && nixShebangRegex.MatchString(lines[0]) {
lines[0] = nixShebangRegex.ReplaceAllString(lines[0], "#!/")
// Iterate through the rest of the lines and correct any /nix/store/*/bin/ path
for i := 1; i < len(lines); i++ {
if nixBinPathRegex.MatchString(lines[i]) {
lines[i] = nixBinPathRegex.ReplaceAllString(lines[i], "")
}
}
correctionsMade = true
}
// If any corrections were made, write the modified content back to the file
if correctionsMade {
if err := os.WriteFile(filePath, []byte(strings.Join(lines, "\n")), 0644); err != nil {
return fmt.Errorf("failed to correct nix object [%s]: %v", filepath.Base(filePath), err)
}
fmt.Printf("[%s] is a nix object. Corrections have been made.\n", filepath.Base(filePath))
}
return nil
}