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|
package main
import (
"fmt"
"io"
"os"
"path/filepath"
)
func copySize(srcs []string) (int64, error) {
var total int64
for _, src := range srcs {
_, err := os.Lstat(src)
if os.IsNotExist(err) {
return total, fmt.Errorf("src does not exist: %q", src)
}
err = filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("walk: %s", err)
}
total += info.Size()
return nil
})
if err != nil {
return total, err
}
}
return total, nil
}
func copyFile(src, dst string, info os.FileInfo, nums chan int64) error {
buf := make([]byte, 4096)
r, err := os.Open(src)
if err != nil {
return err
}
defer r.Close()
w, err := os.OpenFile(dst, os.O_RDWR|os.O_CREATE|os.O_TRUNC, info.Mode())
if err != nil {
return err
}
for {
n, err := r.Read(buf)
if err != nil && err != io.EOF {
w.Close()
os.Remove(dst)
return err
}
if n == 0 {
break
}
if _, err := w.Write(buf[:n]); err != nil {
return err
}
nums <- int64(n)
}
if err := w.Close(); err != nil {
os.Remove(dst)
return err
}
return nil
}
func copyAll(srcs []string, dstDir string) (nums chan int64, errs chan error) {
nums = make(chan int64, 1024)
errs = make(chan error, 1024)
go func() {
for _, src := range srcs {
dst := filepath.Join(dstDir, filepath.Base(src))
_, err := os.Lstat(dst)
if !os.IsNotExist(err) {
var newPath string
for i := 1; !os.IsNotExist(err); i++ {
newPath = fmt.Sprintf("%s.~%d~", dst, i)
_, err = os.Lstat(newPath)
}
dst = newPath
}
filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
if err != nil {
errs <- fmt.Errorf("walk: %s", err)
return nil
}
rel, err := filepath.Rel(src, path)
if err != nil {
errs <- fmt.Errorf("relative: %s", err)
return nil
}
newPath := filepath.Join(dst, rel)
if info.IsDir() {
if err := os.MkdirAll(newPath, info.Mode()); err != nil {
errs <- fmt.Errorf("mkdir: %s", err)
}
nums <- info.Size()
} else if info.Mode()&os.ModeSymlink != 0 { /* Symlink */
if rlink, err := os.Readlink(path); err != nil {
errs <- fmt.Errorf("symlink: %s", err)
} else {
if err := os.Symlink(rlink, newPath); err != nil {
errs <- fmt.Errorf("symlink: %s", err)
}
}
nums <- info.Size()
} else {
if err := copyFile(path, newPath, info, nums); err != nil {
errs <- fmt.Errorf("copy: %s", err)
}
}
return nil
})
}
close(errs)
}()
return nums, errs
}
|
