cleanup.go

   1 /*
   2 goredo -- djb's redo implementation on pure Go
   3 Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 package main
  19
  20 import (
  21         "flag"
  22         "fmt"
  23         "io"
  24         "log"
  25         "os"
  26         "path"
  27         "path/filepath"
  28         "strings"
  29 )
  30
  31 const (
  32         CleanupFull = "full"
  33         CleanupLog  = "log"
  34         CleanupTmp  = "tmp"
  35 )
  36
  37 var DryRun *bool
  38
  39 func init() {
  40         if CmdName() != CmdNameRedoCleanup {
  41                 return
  42         }
  43         DryRun = flag.Bool("n", false, "do no delete files during cleanup, just show them")
  44 }
  45
  46 func redoDirClean(root, what string) error {
  47         root, err := filepath.Abs(root)
  48         if err != nil {
  49                 panic(err)
  50         }
  51         dir, err := os.Open(root)
  52         if err != nil {
  53                 return err
  54         }
  55         for {
  56                 fis, err := dir.Readdir(1 << 10)
  57                 if err != nil {
  58                         if err == io.EOF {
  59                                 break
  60                         }
  61                         return err
  62                 }
  63                 var pth string
  64                 for _, fi := range fis {
  65                         pth = cwdMustRel(root, fi.Name())
  66                         switch what {
  67                         case CleanupLog:
  68                                 if strings.HasSuffix(fi.Name(), LogSuffix) {
  69                                         fmt.Println(pth)
  70                                         if !*DryRun {
  71                                                 if err = os.Remove(pth); err != nil {
  72                                                         return err
  73                                                 }
  74                                         }
  75                                 }
  76                         case CleanupTmp:
  77                                 if strings.HasPrefix(fi.Name(), TmpPrefix) {
  78                                         fmt.Println(pth)
  79                                         if !*DryRun {
  80                                                 if err = os.Remove(pth); err != nil {
  81                                                         return err
  82                                                 }
  83                                         }
  84                                 }
  85                         default:
  86                                 log.Fatalln("unknown cleanup target")
  87                         }
  88                 }
  89         }
  90         return dir.Close()
  91 }
  92
  93 func cleanupWalker(root, what string) error {
  94         root, err := filepath.Abs(root)
  95         if err != nil {
  96                 panic(err)
  97         }
  98         dir, err := os.Open(root)
  99         if err != nil {
 100                 return err
 101         }
 102         defer dir.Close()
 103         for {
 104                 fis, err := dir.Readdir(1 << 10)
 105                 if err != nil {
 106                         if err == io.EOF {
 107                                 break
 108                         }
 109                         return err
 110                 }
 111                 for _, fi := range fis {
 112                         pth := path.Join(root, fi.Name())
 113                         pthRel := cwdMustRel(root, fi.Name())
 114                         if fi.IsDir() {
 115                                 if fi.Name() == RedoDir {
 116                                         if what == CleanupFull {
 117                                                 fmt.Println(pthRel)
 118                                                 if !*DryRun {
 119                                                         err = os.RemoveAll(pth)
 120                                                 }
 121                                         } else {
 122                                                 err = redoDirClean(pth, what)
 123                                         }
 124                                 } else {
 125                                         err = cleanupWalker(pth, what)
 126                                 }
 127                                 if err != nil {
 128                                         return err
 129                                 }
 130                                 continue
 131                         }
 132                         if (what == CleanupTmp || what == CleanupFull) &&
 133                                 strings.HasPrefix(fi.Name(), TmpPrefix) {
 134                                 fmt.Println(pthRel)
 135                                 if !*DryRun {
 136                                         if err = os.Remove(pth); err != nil {
 137                                                 return err
 138                                         }
 139                                 }
 140                         }
 141                 }
 142         }
 143         return dir.Close()
 144 }