package main import ( "fmt" "os" "path/filepath" "syscall" ) const backlog = 100 type entry struct { path string fi os.FileInfo } func walk(dir string) <-chan *entry { ch := make(chan *entry, 100) go func() { err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error { if err != nil { fmt.Fprintf(os.Stderr, "error: %v\n", err) return nil } name, err := filepath.Rel(dir, path) if err != nil { fmt.Fprintf(os.Stderr, "error: %v\n", err) return nil } ch <- &entry{ path: name, fi: info, } return nil }) if err != nil { fmt.Fprintf(os.Stderr, "Walk() error: %v\n", err) } close(ch) }() // first element is root _ = <-ch return ch } func (e *entry) equals(other *entry) bool { if e.path != other.path { return false } if e.fi.Mode() != other.fi.Mode() { return false } if e.fi.ModTime() != other.fi.ModTime() { return false } stat, _ := e.fi.Sys().(*syscall.Stat_t) stat2, _ := other.fi.Sys().(*syscall.Stat_t) if stat.Uid != stat2.Uid || stat2.Gid != stat2.Gid { return false } return true } func main() { if len(os.Args) != 3 { fmt.Fprintf(os.Stderr, "USAGE: %s DIR1 DIR2\n", os.Args[0]) os.Exit(1) } ch1 := walk(os.Args[1]) ch2 := walk(os.Args[2]) changes := false var a, b *entry for { var ok bool if ch1 != nil && a == nil { a, ok = <-ch1 if !ok { ch1 = nil } } if ch2 != nil && b == nil { b, ok = <-ch2 if !ok { ch2 = nil } } if ch1 == nil && ch2 == nil { break } if ch1 == nil { fmt.Printf("+%v\n", b.path) changes = true } else if ch2 == nil { fmt.Printf("-%v\n", a.path) changes = true } else if !a.equals(b) { if a.path < b.path { fmt.Printf("-%v\n", a.path) changes = true a = nil continue } else if a.path > b.path { fmt.Printf("+%v\n", b.path) changes = true b = nil continue } else { fmt.Printf("%%%v\n", a.path) changes = true } } a, b = nil, nil } if changes { os.Exit(1) } }