// fetch returns the anchor files and subdirectories rooted at zdir
func fetch(z *zookeeper.Conn, zdir string, children []string) (dirs map[string]struct{}, files map[circuit.WorkerID]*File, err error) {
dirs = make(map[string]struct{})
files = make(map[circuit.WorkerID]*File)
for _, name := range children {
id, err := circuit.ParseWorkerID(name)
if err != nil {
// Node names that are not files are ok.
// We treat them as subdirectories.
dirs[name] = struct{}{}
continue
}
znode := path.Join(zdir, name)
data, _, err := z.Get(znode)
if err != nil {
// If this is a Zookeeper connection error, we should bail out
log.Printf("Problem getting node `%s` from Zookeeper (%s)", znode, err)
continue
}
zfile := &ZFile{}
r := bytes.NewBufferString(data)
if err := gob.NewDecoder(r).Decode(zfile); err != nil {
log.Printf("anchor file cannot be parsed: (%s)", err)
continue
}
if zfile.Addr.WorkerID() != id {
log.Printf("anchor file name vs addr mismatch: %s vs %s\n", id, zfile.Addr.WorkerID())
continue
}
file := &File{owner: zfile.Addr}
files[id] = file
}
return dirs, files, nil
}
func main() {
flag.Parse()
// Parse WorkerID argument
var (
err error
id circuit.WorkerID
withID bool
)
if flag.NArg() == 1 {
id, err = circuit.ParseWorkerID(flag.Arg(0))
if err != nil {
fmt.Fprintf(os.Stderr, "Problem parsing runtime ID (%s)\n", err)
os.Exit(1)
}
withID = true
} else if flag.NArg() != 0 {
flag.Usage()
}
// Read target hosts from standard input
var hosts []string
buf := bufio.NewReader(os.Stdin)
for {
line, err := buf.ReadString('\n')
if line != "" {
line = strings.TrimSpace(line)
hosts = append(hosts, line)
}
if err == io.EOF {
break
}
if err != nil {
fmt.Fprintf(os.Stderr, "Problem reading target hosts (%s)", err)
os.Exit(1)
}
}
// Log into each host and kill pertinent workers, using POSIX kill
for _, h := range hosts {
println("Hard-killing circuit worker(s) on", h)
var killSh string
if withID {
killSh = fmt.Sprintf("ps ax | grep -i %s | grep -v grep | awk '{print $1}' | xargs kill -KILL\n", id.String())
} else {
killSh = fmt.Sprintf("ps ax | grep -i %s | grep -v grep | awk '{print $1}' | xargs kill -KILL\n", config.Config.Deploy.Worker)
}
_, stderr, err := posix.Exec("ssh", "", killSh, h, "sh")
if err != nil {
fmt.Fprintf(os.Stderr, "Problem while killing workers on %s (%s)\n", h, err)
fmt.Fprintf(os.Stderr, "Remote shell error output:\n%s\n", stderr)
}
}
}
// Sanitizer ensures that anchor is a valid anchor path in the fs
// and returns its parts
func Sanitize(anchor string) ([]string, string, error) {
anchor = path.Clean(anchor)
if len(anchor) == 0 || anchor[0] != '/' {
return nil, "", ErrName
}
parts := strings.Split(anchor[1:], "/")
for _, part := range parts {
if _, err := circuit.ParseWorkerID(part); err == nil {
return nil, "", ErrName
}
}
return parts, "/" + path.Join(parts...), nil
}
/*
/dir
/dir/...
/dir/file
*/
func parse(s string) (anchor string, file, recurse bool, err error) {
s = strings.TrimSpace(s)
if len(s) == 0 || s[0] != '/' {
return "", false, false, circuit.NewError("invalid anchor")
}
if len(s) > 3 && s[len(s)-3:] == "..." {
recurse = true
s = s[:len(s)-3]
}
_, leaf := path.Split(s)
if _, err := circuit.ParseWorkerID(leaf); err == nil {
return s, true, false, nil
}
return s, false, recurse, nil
}
func (fs *FS) OpenFile(anchor string) (anchorfs.File, error) {
ad, af := path.Split(anchor)
id, err := circuit.ParseWorkerID(af)
if err != nil {
return nil, err
}
dir, err := fs.OpenDir(ad)
if err != nil {
return nil, err
}
file, err := dir.OpenFile(id)
if err != nil {
return nil, err
}
return file, nil
}
func main() {
if len(os.Args) != 2 {
println("Usage:", os.Args[0], "JailDir")
os.Exit(1)
}
jailDir := os.Args[1]
jail, err := os.Open(jailDir)
if err != nil {
fmt.Fprintf(os.Stderr, "Cannot open jail directory (%s)\n", err)
os.Exit(1)
}
defer jail.Close()
fifi, err := jail.Readdir(0)
if err != nil {
fmt.Fprintf(os.Stderr, "Cannot read jail directory (%s)\n", err)
os.Exit(1)
}
for _, fi := range fifi {
if !fi.IsDir() {
continue
}
if _, err := circuit.ParseWorkerID(fi.Name()); err != nil {
continue
}
workerJail := path.Join(jailDir, fi.Name())
println("Clearing", workerJail)
l, err := lockfile.Create(path.Join(workerJail, "lock"))
if err != nil {
// This worker is alive; still holding lock; move on
println(err.Error())
continue
}
l.Release()
if err := os.RemoveAll(workerJail); err != nil {
fmt.Fprintf(os.Stderr, "Cannot remove worker jail %s (%s)\n", workerJail, err)
os.Exit(1)
}
}
}