88 lines
1.5 KiB
Go
88 lines
1.5 KiB
Go
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package sys
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import (
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"time"
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"github.com/fsnotify/fsnotify"
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)
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func Run(cmd string, args ...string) (err error) {
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c := exec.Command(cmd, args...)
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c.Stdout = os.Stdout
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c.Stderr = os.Stderr
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if err = c.Run(); err != nil {
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log.Printf("command %s %q failed: %v", cmd, args, err)
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}
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return
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}
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func MustRun(cmd string, args ...string) {
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if err := Run(cmd, args...); err != nil {
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log.Fatal("FATAL: mandatory command did not succeed")
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}
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}
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func Mkdir(dir string, mode os.FileMode) {
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if err := os.MkdirAll(dir, mode); err != nil {
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log.Fatalf("FATAL: mkdir %q failed: %v", dir, err)
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}
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}
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func FileExists(path string) bool {
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_, err := os.Stat(path)
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if err != nil {
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if !os.IsNotExist(err) {
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log.Printf("WARNING: failed to stat %q, assuming not exist: %v", path, err)
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}
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return false
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}
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return true
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}
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func WaitFile(path string, timeout <-chan time.Time) {
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if FileExists(path) {
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return
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}
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watch, err := fsnotify.NewWatcher()
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if err != nil {
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log.Fatal("FATAL: fsnotify: failed to create: ", err)
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}
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defer watch.Close()
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dir := filepath.Dir(path)
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if err = watch.Add(dir); err != nil {
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log.Fatalf("FATAL: fsnotify: failed to add %s: %v", dir, err)
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}
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go func() {
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for err := range watch.Errors {
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log.Fatal("FATAL: fsnotify: error: ", err)
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}
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}()
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timedOut := false
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for !timedOut {
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select {
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case <-watch.Events:
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// skip
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case <-timeout:
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timedOut = true
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}
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if FileExists(path) {
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return
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}
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}
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log.Fatal("FATAL: timed out waiting for ", path)
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}
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