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package shell
import "strings"
import "time"
import "os"
import "os/exec"
import "bufio"
import "io/ioutil"
// import "github.com/davecgh/go-spew/spew"
import "github.com/svent/go-nbreader"
// import "log"
import log "github.com/sirupsen/logrus"
// TODO: look at https://github.com/go-cmd/cmd/issues/20
// use go-cmd instead here?
var callback func(interface{}, int)
var shellStdout *os.File
var shellStderr *os.File
var spewOn bool = false
var quiet bool = false
// var msecDelay int = 20 // number of milliseconds to delay between reads with no data
// var bytesBuffer bytes.Buffer
// var bytesSplice []byte
func handleError(c interface{}, ret int) {
log.Debug("shell.Run() Returned", ret)
if (callback != nil) {
callback(c, ret)
}
}
func init() {
callback = nil
}
func InitCallback(f func(interface{}, int)) {
callback = f
}
// this means it won't copy all the output to STDOUT
func Quiet(q bool) {
quiet = q
}
func Script(cmds string) int {
// split on new lines (while we are at it, handle stupid windows text files
lines := strings.Split(strings.Replace(cmds, "\r\n", "\n", -1), "\n")
for _, line := range lines {
line = Chomp(line) // this is like 'chomp' in perl
log.Println("LINE:", line)
time.Sleep(1)
Run(line)
}
return 0
}
func SpewOn() {
spewOn = true
}
func SetDelayInMsec(msecs int) {
msecDelay = msecs
}
func SetStdout(newout *os.File) {
shellStdout = newout
}
func SetStderr(newerr *os.File) {
shellStderr = newerr
}
func Unlink(filename string) {
os.Remove(Path(filename))
}
func RM(filename string) {
os.Remove(Path(filename))
}
/*
err := process.Wait()
if err != nil {
if (spewOn) {
// this panics: spew.Dump(err.(*exec.ExitError))
spew.Dump(process.ProcessState)
}
// stuff := err.(*exec.ExitError)
log.Debug("ERROR ", err.Error())
log.Debug("END ", cmdline)
handleError(err, -1)
return ""
*/
func Daemon(cmdline string, timeout time.Duration) int {
for {
Run(cmdline)
time.Sleep(timeout)
}
}
// pass in two file handles (1 read, 1 write)
func nonBlockingReader(buffReader *bufio.Reader, writeFileHandle *os.File, stdout *bufio.Writer) {
// newreader := bufio.NewReader(readFileHandle)
// create a nonblocking GO reader
nbr := nbreader.NewNBReader(buffReader, 1024)
for {
// defer buffReader.Close()
// defer writeFileHandle.Flush()
defer writeFileHandle.Close()
totalCount := 0
for {
oneByte := make([]byte, 1024)
count, err := nbr.Read(oneByte)
if (err != nil) {
log.Debug("count, err =", count, err)
handleError(err, -1)
return
}
totalCount += count
if (count == 0) {
time.Sleep(time.Duration(msecDelay) * time.Millisecond) // without this delay this will peg the CPU
if (totalCount != 0) {
log.Debug("STDERR: totalCount = ", totalCount)
totalCount = 0
}
} else {
log.Debug("STDERR: count = ", count)
writeFileHandle.Write(oneByte[0:count])
if (quiet == false) {
stdout.Write(oneByte[0:count])
stdout.Flush()
}
}
}
}
}
// run something and never return from it
// TODO: pass STDOUT, STDERR, STDIN correctly
// TODO: figure out how to nohup the process and exit
func Exec(cmdline string) {
log.Println("shell.Run() START " + cmdline)
cmd := Chomp(cmdline) // this is like 'chomp' in perl
cmdArgs := strings.Fields(cmd)
process := exec.Command(cmdArgs[0], cmdArgs[1:len(cmdArgs)]...)
process.Stderr = os.Stderr
process.Stdin = os.Stdin
process.Stdout = os.Stdout
process.Start()
err := process.Wait()
log.Println("shell.Exec() err =", err)
os.Exit(0)
}
// return true if the filename exists (cross-platform)
func Exists(filename string) bool {
_, err := os.Stat(Path(filename))
if os.IsNotExist(err) {
return false
}
return true
}
// return true if the filename exists (cross-platform)
func Dir(dirname string) bool {
info, err := os.Stat(Path(dirname))
if os.IsNotExist(err) {
return false
}
return info.IsDir()
}
// Cat a file into a string
func Cat(filename string) string {
buffer, err := ioutil.ReadFile(Path(filename))
// log.Println("buffer =", string(buffer))
if err != nil {
return ""
}
return Chomp(buffer)
}
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