~welt/murse

ref: toast murse/upgrade.go -rw-r--r-- 2.2 KiB
6a4e2213welt Initial work on TVS support, and toaster. 6 months ago
                                                                                
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package main

import (
	"fmt"
	"io"
	"os"
	"path/filepath"
	"runtime/debug"
	"strconv"
)

func upgradeMain(dir string, url string) int {
	instRev, err := getInstalledRevision(dir)
	if err != nil {
		errPrintln(err)
		return 1
	}

	client := NewClient(url)

	latestRev, err := client.GetLatestRevision()
	if err != nil {
		errPrintln(err)
		return 1
	}

	errPrintln(instRev, "->", latestRev)

	var revisions [][]Change
	for i := instRev + 1; i != latestRev+1; i++ {
		rev, err := client.GetRevision(i)
		if err != nil {
			debug.PrintStack()
			errPrintln(err)
			return 1
		}

		revisions = append(revisions, rev)
	}

	changes := replayChanges(revisions)
	writes, mkdirs, dels := splitChanges(changes)
	err = os.RemoveAll(filepath.Join(dir, ".revision"))
	if err != nil {
		errPrintln(err)
		return 1
	}

	for _, v := range dels {
		fmt.Println("DEL", v.Path)
		path := filepath.FromSlash(v.Path)
		err := os.Remove(filepath.Join(dir, path))
		if err != nil && !os.IsNotExist(err) {
			errPrintln(err)
			return 1
		}
	}

	for _, v := range mkdirs {
		path := filepath.FromSlash(v.Path)
		err := os.MkdirAll(filepath.Join(dir, path), 0777)
		if err != nil {
			errPrintln(err)
			return 1
		}
	}

	pool := NewPool(16)
	jobs := len(writes)
	done := 0

	for _, v := range writes {
		change := v
		f := func() error {
			fmt.Println("WRITE", change.Path)
			object, err := client.GetObject(change.Object)
			if err != nil {
				return err
			}

			defer object.Close()

			path := filepath.FromSlash(change.Path)
			file, err := os.Create(filepath.Join(dir, path))
			if err != nil {
				return err
			}

			defer file.Close()

			_, err = io.Copy(file, object)
			return err
		}

		pool.Jobch <- f

		select {
		case err := <-pool.Errch:
			if err != nil {
				pool.Stop()
				errPrintln(err)
				for {
					select {
					case err := <-pool.Errch:
						errPrintln(err)
					default:
						goto postloop
					}
				}
			postloop:
				return 1
			}

			done++
		default:
			continue
		}

		if done >= jobs {
			pool.Stop()
			break
		}
	}

	file, err := os.Create(filepath.Join(dir, ".revision"))
	if err != nil {
		errPrintln(err)
		return 1
	}

	defer file.Close()

	_, err = file.Write([]byte(strconv.Itoa(latestRev)))
	if err != nil {
		errPrintln(err)
		return 1
	}

	return 0

}