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package main | |
import ( | |
"flag" | |
"log" | |
"os" | |
"path" | |
) | |
var src = flag.String("src", "/usr", "source path") | |
var dst = flag.String("dst", "/usr.copy", "destination path") | |
func copyEntries(src string, dst string) error { | |
f, err := os.Open(src) | |
if err != nil { | |
return err | |
} | |
infos, err := f.Readdir(-1) | |
f.Close() | |
if err != nil { | |
return err | |
} | |
dircount := 0 | |
errs := make(chan error, len(infos)) | |
for _, fi := range infos { | |
csrc := path.Join(src, fi.Name()) | |
cdst := path.Join(dst, fi.Name()) | |
if fi.IsDir() { | |
go func(fi os.FileInfo) { | |
errs <- copy(csrc, cdst, fi) | |
}(fi) | |
dircount += 1 | |
} else { | |
copy(csrc, cdst, fi) | |
} | |
} | |
for i := 0; i < dircount; i++ { | |
if err := <-errs; err != nil { | |
return err | |
} | |
} | |
return nil | |
} | |
func copy(src string, dst string, fi os.FileInfo) error { | |
mod := fi.Mode() | |
switch { | |
case mod&os.ModeSymlink != 0: | |
if tgt, err := os.Readlink(src); err != nil { | |
return err | |
} else { | |
if err := os.Symlink(tgt, dst); err != nil { | |
return err | |
} | |
} | |
case mod&os.ModeDir != 0: | |
if err := os.Mkdir(dst, mod); err != nil { | |
return err | |
} | |
if err := copyEntries(src, dst); err != nil { | |
return err | |
} | |
default: | |
if err := os.Link(src, dst); err != nil { | |
return err | |
} | |
} | |
return nil | |
} | |
func main() { | |
flag.Parse() | |
if err := os.Mkdir(*dst, 0755); err != nil && !os.IsExist(err) { | |
log.Fatal(err) | |
} | |
if err := copyEntries(*src, *dst); err != nil { | |
log.Fatal(err) | |
} | |
} |
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