Golang ACIdentifier Examples

Example #1

File: write.go Project: rhencke/acbuild

// Write will produce the resulting ACI from the current build context, saving
// it to the given path, optionally signing it.
func (a *ACBuild) Write(output string, overwrite, sign bool, gpgflags []string) (err error) {
	if err = a.lock(); err != nil {
		return err
	}
	defer func() {
		if err1 := a.unlock(); err == nil {
			err = err1
		}
	}()

	man, err := util.GetManifest(a.CurrentACIPath)
	if err != nil {
		return err
	}

	if man.App != nil && len(man.App.Exec) == 0 {
		fmt.Fprintf(os.Stderr, "warning: exec command was never set.\n")
	}

	if man.Name == types.ACIdentifier(placeholdername) {
		return fmt.Errorf("can't write ACI, name was never set")
	}

	fileFlags := os.O_CREATE | os.O_WRONLY

	_, err = os.Stat(output)
	switch {
	case os.IsNotExist(err):
		break
	case err != nil:
		return err
	default:
		if !overwrite {
			return fmt.Errorf("ACI already exists: %s", output)
		}
		fileFlags |= os.O_TRUNC
	}

	// open/create the aci file
	ofile, err := os.OpenFile(output, fileFlags, 0644)
	if err != nil {
		return err
	}
	defer ofile.Close()

	defer func() {
		// When write is done, if an error is encountered remove the partial
		// ACI that had been written.
		if err != nil {
			os.Remove(output)
			os.Remove(output + ".asc")
		}
	}()

	// setup compression
	gzwriter := gzip.NewWriter(ofile)
	defer gzwriter.Close()

	// create the aci writer
	aw := aci.NewImageWriter(*man, tar.NewWriter(gzwriter))
	err = filepath.Walk(a.CurrentACIPath, aci.BuildWalker(a.CurrentACIPath, aw, nil))
	defer aw.Close()
	if err != nil {
		pathErr, ok := err.(*os.PathError)
		if !ok {
			fmt.Printf("not a path error!\n")
			return err
		}
		syscallErrno, ok := pathErr.Err.(syscall.Errno)
		if !ok {
			fmt.Printf("not a syscall errno!\n")
			return err
		}
		if pathErr.Op == "open" && syscallErrno != syscall.EACCES {
			return err
		}
		problemPath := pathErr.Path[len(path.Join(a.CurrentACIPath, aci.RootfsDir)):]
		return fmt.Errorf("%q: permission denied - call write as root", problemPath)
	}

	if sign {
		err = signACI(output, output+".asc", gpgflags)
		if err != nil {
			return err
		}
	}

	return nil
}

Example #2

File: write.go Project: aaronlevy/acbuild

// Write will produce the resulting ACI from the current build context, saving
// it to the given path, optionally signing it.
func (a *ACBuild) Write(output string, overwrite, sign bool, gpgflags []string) (err error) {
	if err = a.lock(); err != nil {
		return err
	}
	defer func() {
		if err1 := a.unlock(); err == nil {
			err = err1
		}
	}()

	man, err := util.GetManifest(a.CurrentACIPath)
	if err != nil {
		return err
	}

	if man.App != nil && len(man.App.Exec) == 0 {
		fmt.Fprintf(os.Stderr, "warning: exec command was never set.\n")
	}

	if man.Name == types.ACIdentifier(placeholdername) {
		return fmt.Errorf("can't write ACI, name was never set")
	}

	fileFlags := os.O_CREATE | os.O_WRONLY

	ex, err := util.Exists(output)
	if err != nil {
		return err
	}
	if ex {
		if !overwrite {
			return fmt.Errorf("ACI already exists: %s", output)
		}
		fileFlags |= os.O_TRUNC
	}

	// open/create the aci file
	ofile, err := os.OpenFile(output, fileFlags, 0644)
	if err != nil {
		return err
	}
	defer ofile.Close()

	// setup compression
	gzwriter := gzip.NewWriter(ofile)
	defer gzwriter.Close()

	// create the aci writer
	aw := aci.NewImageWriter(*man, tar.NewWriter(gzwriter))
	err = filepath.Walk(a.CurrentACIPath, aci.BuildWalker(a.CurrentACIPath, aw, nil))
	defer aw.Close()
	if err != nil {
		return err
	}

	if sign {
		err = signACI(output, output+".asc", gpgflags)
		if err != nil {
			os.Remove(output)
			os.Remove(output + ".asc")
			return err
		}
	}

	return nil
}