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package main
import (
"errors"
"io/fs"
"os"
"syscall"
"time"
)
const maxRetries = 3
const retryDelay = 100 * time.Millisecond
type SyncError struct {
Path string
Op string
Err error
}
func (e *SyncError) Error() string {
return e.Op + " " + e.Path + ": " + e.Err.Error()
}
func (e *SyncError) Unwrap() error {
return e.Err
}
func retry(name string, fn func() error) error {
var lastErr error
for i := 0; i < maxRetries; i++ {
lastErr = fn()
if lastErr == nil {
return nil
}
if !isRetryable(lastErr) {
return lastErr
}
time.Sleep(retryDelay * time.Duration(i+1))
}
return lastErr
}
func isRetryable(err error) bool {
if errors.Is(err, fs.ErrNotExist) {
return true
}
if errors.Is(err, syscall.ENOENT) {
return true
}
return false
}
func logSyncError(op, relPath string, err error) {
if err == nil {
return
}
if errors.Is(err, fs.ErrNotExist) {
return
}
var pathErr *fs.PathError
if errors.As(err, &pathErr) {
err = pathErr.Err
}
switch {
case errors.Is(err, syscall.ENOSPC):
logErrorf("DISK FULL: %s %s failed - no space left on device", op, relPath)
case errors.Is(err, syscall.EACCES), errors.Is(err, syscall.EPERM):
logErrorf("PERMISSION DENIED: %s %s - check volume mount permissions", op, relPath)
case errors.Is(err, syscall.ELOOP):
logErrorf("SYMLINK LOOP: %s %s - too many symbolic links", op, relPath)
default:
logErrorf("%s %s: %v", op, relPath, err)
}
}
func copyFileWithRetry(src, dst string, mode os.FileMode) error {
return retry("copy", func() error {
return copyFile(src, dst, mode)
})
}
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