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sync.go
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sync.go
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package main
import (
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
)
func statsEqual(a, b os.FileInfo) bool {
if a.IsDir() || b.IsDir() {
return a.IsDir() == b.IsDir()
}
if a.Mode().IsRegular() != b.Mode().IsRegular() {
return false
}
if a.Mode().IsRegular() && !a.ModTime().Equal(b.ModTime()) {
return false
}
return true
}
func sync(fi os.FileInfo, dirFrom, dirTo string) {
name := fi.Name()
from := filepath.Join(dirFrom, name)
to := filepath.Join(dirTo, name)
if fi.IsDir() {
syncDir(from, to)
return
}
mode := fi.Mode()
if !mode.IsRegular() {
if mode&os.ModeSymlink == os.ModeSymlink {
lnk, err := os.Readlink(from)
if err != nil {
log.Printf("Could not read link: %s", err.Error())
return
}
err = os.Symlink(lnk, to)
if err != nil {
log.Printf("Could not create symlink: %s", err.Error())
return
}
} else {
log.Printf("Creation of anything but symlinks is not suppoted yet (%s)", from)
}
return
}
oldContents, err := ioutil.ReadFile(from)
if err != nil {
log.Printf("Could not read %s: %s", from, err.Error())
return
}
newContents, err := rewriteFile(from)
if err != nil {
log.Printf("Could not rewrite file %s: %s", from, err.Error())
os.Stderr.Write([]byte("\n"))
newContents = oldContents
}
err = ioutil.WriteFile(to, newContents, fi.Mode().Perm())
if err != nil {
log.Printf("Could not write %s: %s", to, err.Error())
return
}
err = os.Chtimes(to, fi.ModTime(), fi.ModTime())
if err != nil {
log.Printf("Could not chtimes %s: %s", to, err.Error())
return
}
origPath := to + ".orig"
err = ioutil.WriteFile(origPath, oldContents, fi.Mode().Perm())
if err != nil {
log.Printf("Could not write %s: %s", origPath, err.Error())
return
}
err = os.Chtimes(origPath, fi.ModTime(), fi.ModTime())
if err != nil {
log.Printf("Could not chtimes %s: %s", origPath, err.Error())
return
}
}
// TODO: maybe make configurable?
var ignoreDirs = map[string]bool{
".git": true,
".hg": true,
".unrealsync": true,
"node_modules": true,
}
func syncDir(dirFrom, dirTo string) {
os.Stderr.WriteString("\033[A\033[2K" + dirFrom + "\n")
if ignoreDirs[filepath.Base(dirFrom)] {
return
}
if _, err := os.Lstat(dirTo); err != nil {
if os.IsNotExist(err) {
if err := os.MkdirAll(dirTo, 0777); err != nil {
log.Printf("Could not create target dir %s: %s", dirFrom, err.Error())
return
}
}
}
fromList, err := ioutil.ReadDir(dirFrom)
if err != nil {
log.Printf("Could not read from %s: %s", dirFrom, err.Error())
return
}
toList, err := ioutil.ReadDir(dirTo)
if err != nil {
log.Printf("Could not read target dir %s: %s", dirTo, err.Error())
return
}
fromMap := make(map[string]os.FileInfo)
toMap := make(map[string]os.FileInfo)
for _, fi := range fromList {
fromMap[fi.Name()] = fi
}
for _, fi := range toList {
toMap[fi.Name()] = fi
}
for name, fi := range fromMap {
if toFi, ok := toMap[name]; ok {
if fi.IsDir() && toFi.IsDir() {
syncDir(filepath.Join(dirFrom, name), filepath.Join(dirTo, name))
continue
}
if statsEqual(fi, toFi) {
continue
}
if err := os.RemoveAll(filepath.Join(dirTo, name)); err != nil {
log.Printf("Could not remove target: %s", err.Error())
continue
}
}
sync(fi, dirFrom, dirTo)
}
for name := range toMap {
if _, ok := fromMap[name]; ok {
continue
}
// don't remove original ("backup") files if the source file still exists
if _, ok := fromMap[strings.TrimSuffix(name, ".orig")]; ok {
continue
}
if err := os.RemoveAll(filepath.Join(dirTo, name)); err != nil {
log.Printf("Could not remove target: %s", err.Error())
continue
}
}
}