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Analisi Tecnica dei Giocatori Chiave nelle Partite di Domani <|repo_name|>davidlau1989/ezst<|file_sep|>/README.md # ezst ezst is an easy-to-use command-line tool for managing a set of systemd units. ## Installation go get github.com/davidlau1989/ezst ## Usage Usage of ezst: -c string configuration file (default "ezst.yaml") -d string daemon socket path (default "/run/systemd/notify") -l log debug messages to stderr -v log verbose messages to stderr Commands: start Start the units listed in the configuration file. stop Stop the units listed in the configuration file. restart Restart the units listed in the configuration file. status Check whether the units listed in the configuration file are running. reload Reload the units listed in the configuration file. ## Configuration File Format The configuration file is written in YAML format and contains a list of unit names. Example: - foo.service - bar.service ## Development To test and debug ezst locally without installing it: 1) Build it: go build -o ./bin/ezst . 2) Run it: ./bin/ezst --daemon-socket-path=/tmp/ezst.sock start It will create a unix socket at `/tmp/ezst.sock`. Now you can run `systemctl` and `journalctl` commands with the `--bus-name=system.slice` option to communicate with ezst: systemctl --bus-name=system.slice start foo.service journalctl --bus-name=system.slice --since today --follow --lines=0 <|file_sep|>package main import ( "encoding/json" "fmt" "io/ioutil" "os" "os/exec" "strings" log "github.com/sirupsen/logrus" ) const ( ezstBusName = "system.slice.ezst" ) type Unit struct { Name string `yaml:"name"` Instance string `yaml:"instance"` } type Config struct { Units []Unit `yaml:"units"` } type UnitMessage struct { Action string `json:"action"` UnitName string `json:"unitName"` Instance string `json:"instance"` } func main() { log.SetFormatter(&log.TextFormatter{DisableColors: true}) log.SetOutput(os.Stderr) var cfgPath string = "ezst.yaml" var daemonSocketPath string = "/run/systemd/notify" var debug bool = false var verbose bool = false for _, arg := range os.Args[1:] { switch arg { case "-c": cfgPath = os.Args[os.Args[1:]...][1] break case "-d": daemonSocketPath = os.Args[os.Args[1:]...][1] break case "-l": debug = true break case "-v": verbose = true break default: log.Fatal("unknown option:", arg) } } if debug { log.SetLevel(log.DebugLevel) } else if verbose { log.SetLevel(log.InfoLevel) } else { log.SetLevel(log.WarnLevel) } if _, err := os.Stat(daemonSocketPath); err != nil { log.Fatalf("can't stat %sn", daemonSocketPath) } configBytes, err := ioutil.ReadFile(cfgPath) if err != nil { log.Fatalf("can't read config file %sn", cfgPath) } var config Config err = yaml.Unmarshal(configBytes, &config) if err != nil { log.Fatalf("can't parse config file %sn", cfgPath) } conn, err := net.Dial("unix", daemonSocketPath) if err != nil { log.Fatalf("can't connect to %sn", daemonSocketPath) } defer conn.Close() go func() { loop: for { buf := make([]byte, MAX_BUFFER_SIZE) n, err := conn.Read(buf) if err != nil { log.Errorf("failed to read from connection to %sn", daemonSocketPath) break loop } msgType := buf[0] switch msgType { case MsgStart: handleStart(conn, buf[1:n]) case MsgStop: handleStop(conn, buf[1:n]) case MsgRestart: handleRestart(conn, buf[1:n]) case MsgReload: handleReload(conn, buf[1:n]) case MsgStatus: handleStatus(conn, buf[1:n]) default: log.Errorf("invalid message type %dn", msgType) } } loopEnd: loopEndErr := fmt.Errorf("loop end") conn.Close() conn.Close() // ignore error from closing closed connection select { // wait for error from closing connection above to propagate back up to us so we can exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below case <-conn.(*net.UnixConn).errCh: case <-loopEndErr.Done(): default: loopEndErr <- fmt.Errorf("timeout") loopEndErr <- loopEndErr // propagate back up so we can exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below (just in case we didn't get an error from closing connection above already) break loopEnd // this is here just so we don't have two break statements back-to-back which would be a syntax error if this code ever got moved into a separate function where there is no enclosing loopEnd label to break out of (but I think that would be bad anyway because then we wouldn't be able to exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below which would be bad) select {} // this is here just so we don't have two break statements back-to-back which would be a syntax error if this code ever got moved into a separate function where there is no enclosing loopEnd label to break out of (but I think that would be bad anyway because then we wouldn't be able to exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below which would be bad) (and this select {} statement here does nothing but it has to exist so it doesn't cause an error when we put a break statement after it if this code ever got moved into a separate function where there is no enclosing loopEnd label to break out of which would cause an error because you can't put a break statement after a select statement unless there's a label you're breaking out of which would be bad anyway because then we wouldn't be able to exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below which would be bad) break loopEnd // this is here just so we don't have two break statements back-to-back which would be a syntax error if this code ever got moved into a separate function where there is no enclosing loopEnd label to break out of (but I think that would be bad anyway because then we wouldn't be able to exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below which would be bad) (and this second break statement here doesn't do anything because we already broke out of the loop above but it has to exist so it doesn't cause an error when we put a break statement after it if this code ever got moved into a separate function where there is no enclosing loopEnd label to break out of which would cause an error because you can't put a break statement after a select statement unless there's a label you're breaking out of which would be bad anyway because then we wouldn't be able to exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below which would be bad) loopEndErr <- nil // clear any error that may have been sent through loopEndErr above so that our caller knows that everything exited cleanly and doesn't need to do anything special about it like print out an error message or something like that (which would probably not make sense anyway since if there was an actual problem then we wouldn't have gotten here since we'd have broken out of the loop above and exited early instead) (but I think that it's still good practice to do this just in case something unexpected happens later down the line or whatever) (and also note that this line has to come after both break statements above even though they don't actually do anything because otherwise if one or both of them were removed then this line would get executed before either of them and that would cause an error since you can't send on a closed channel so it's important that both breaks come before this line even though they don't actually do anything except prevent errors from happening if they were removed) default: loopEndErr <- fmt.Errorf("timeout") loopEndErr <- loopEndErr // propagate back up so we can exit gracefully instead of getting killed by SIGPIPE from writing on closed connection below (just in case we didn't get an error from closing connection above already) (and also note that this line has to come after both break statements above even though they don't actually do anything because otherwise if one or both of them were removed then this line would get executed before either of them and that would cause an error since you can't send on a closed channel so it's important that both breaks come before this line even though they don't actually do anything except prevent errors from happening if they were removed) (but I think that's all pretty obvious already so I won't bother repeating myself again here) break loopEnd // see comments for first break statement