cleanup.go

   1 /*
   2 goredo -- djb's redo implementation on pure Go
   3 Copyright (C) 2020-2022 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         defer dir.Close()
  56         for {
  57                 fis, err := dir.Readdir(1 << 10)
  58                 if err != nil {
  59                         if err == io.EOF {
  60                                 break
  61                         }
  62                         return err
  63                 }
  64                 var pth string
  65                 for _, fi := range fis {
  66                         pth = cwdMustRel(root, fi.Name())
  67                         switch what {
  68                         case CleanupLog:
  69                                 if strings.HasSuffix(fi.Name(), LogSuffix) ||
  70                                         strings.HasSuffix(fi.Name(), LogRecSuffix) {
  71                                         fmt.Println(pth)
  72                                         if !*DryRun {
  73                                                 if err = os.Remove(pth); err != nil {
  74                                                         return err
  75                                                 }
  76                                         }
  77                                 }
  78                         case CleanupTmp:
  79                                 if strings.HasPrefix(fi.Name(), TmpPrefix) {
  80                                         fmt.Println(pth)
  81                                         if !*DryRun {
  82                                                 if err = os.Remove(pth); err != nil {
  83                                                         return err
  84                                                 }
  85                                         }
  86                                 }
  87                         default:
  88                                 log.Fatalln("unknown cleanup target")
  89                         }
  90                 }
  91         }
  92         return nil
  93 }
  94
  95 func cleanupWalker(root, what string) error {
  96         root, err := filepath.Abs(root)
  97         if err != nil {
  98                 panic(err)
  99         }
 100         dir, err := os.Open(root)
 101         if err != nil {
 102                 return err
 103         }
 104         defer dir.Close()
 105         for {
 106                 fis, err := dir.Readdir(1 << 10)
 107                 if err != nil {
 108                         if err == io.EOF {
 109                                 break
 110                         }
 111                         return err
 112                 }
 113                 for _, fi := range fis {
 114                         pth := path.Join(root, fi.Name())
 115                         pthRel := cwdMustRel(root, fi.Name())
 116                         if fi.IsDir() {
 117                                 if fi.Name() == RedoDir {
 118                                         if what == CleanupFull {
 119                                                 fmt.Println(pthRel)
 120                                                 if !*DryRun {
 121                                                         err = os.RemoveAll(pth)
 122                                                 }
 123                                         } else {
 124                                                 err = redoDirClean(pth, what)
 125                                         }
 126                                 } else if (what == CleanupTmp || what == CleanupFull) &&
 127                                         strings.HasPrefix(fi.Name(), TmpPrefix) {
 128                                         fmt.Println(pthRel)
 129                                         if !*DryRun {
 130                                                 err = os.RemoveAll(pth)
 131                                         }
 132                                 } else {
 133                                         err = cleanupWalker(pth, what)
 134                                 }
 135                                 if err != nil {
 136                                         return err
 137                                 }
 138                                 continue
 139                         }
 140                         if (what == CleanupTmp || what == CleanupFull) &&
 141                                 strings.HasPrefix(fi.Name(), TmpPrefix) {
 142                                 fmt.Println(pthRel)
 143                                 if !*DryRun {
 144                                         if err = os.Remove(pth); err != nil {
 145                                                 return err
 146                                         }
 147                                 }
 148                         }
 149                 }
 150         }
 151         return nil
 152 }