toolbox/backup-db.sh

   1 #!/bin/sh
   2
   3 # This script makes a rotating backup of the very
   4 # important database files $chroot/etc/passwd and
   5 # $chroot/etc/group and $chroot/etc/sshkeys.
   6 # Backup files are rotated dropping .9.$ext and
   7 # renaming the others to the next higher number
   8 # and then finally making a copy of the original
   9 # to a .1 (not compressed for passwd and group).
  10
  11 # Running this regularly from a cron entry is
  12 # highly recommended.  It may be run manually
  13 # from the $basedir/toolbox directory any time
  14 # after make install has been run to create an
  15 # immediate backup.
  16
  17 # Backups retain the modification date of the file
  18 # they are backing up at the time the backup was
  19 # made.  If restoration is required this can be
  20 # used to determine the time period from which data
  21 # would be lost if the backup were to be used.
  22
  23 set -e
  24
  25 . @basedir@/shlib.sh
  26
  27 # rotate_file basename suffix
  28 rotate_file2_9() {
  29         [ -f "$1.8.$2" ] && mv -f "$1.8.$2" "$1.9.$2"
  30         [ -f "$1.7.$2" ] && mv -f "$1.7.$2" "$1.8.$2"
  31         [ -f "$1.6.$2" ] && mv -f "$1.6.$2" "$1.7.$2"
  32         [ -f "$1.5.$2" ] && mv -f "$1.5.$2" "$1.6.$2"
  33         [ -f "$1.4.$2" ] && mv -f "$1.4.$2" "$1.5.$2"
  34         [ -f "$1.3.$2" ] && mv -f "$1.3.$2" "$1.4.$2"
  35         [ -f "$1.2.$2" ] && mv -f "$1.2.$2" "$1.3.$2"
  36         return 0
  37 }
  38
  39 # backup_file basename
  40 backup_file() {
  41         rotate_file2_9 "$1" gz
  42         if [ -f "$1.1" ]; then
  43                 rm -f "$1.2.gz"
  44                 gzip -n9 < "$1.1" > "$1.2.gz" && \
  45                 touch -r "$1.1" "$1.2.gz" && \
  46                 chmod a-w "$1.2.gz"
  47         fi
  48         if [ -f "$1" ]; then
  49                 cp -pf "$1" "$1.1" && \
  50                 chmod a-w "$1.1"
  51         fi
  52         return 0
  53 }
  54
  55 # badkup_dir basename
  56 backup_dir() (
  57         set -e
  58         rotate_file2_9 "$1" tar.gz
  59         [ -f "$1.1.tar.gz" ] && mv -f "$1.1.tar.gz" "$1.2.tar.gz"
  60         if [ -d "$1" ]; then
  61                 cd "$(dirname "$1")"
  62                 base="$(basename "$1")"
  63                 rm -f "$base.1.tar.gz"
  64                 tar -c -f - $base | gzip -n9 > "$base.1.tar.gz"
  65                 chmod a-w "$base.1.tar.gz"
  66         fi
  67         return 0
  68 )
  69
  70 # Be paranoid
  71 if [ -z "$cfg_chroot" ] || [ "$cfg_chroot" = "/" ]; then
  72   echo 'Config.pm chroot setting is invalid' >&2
  73   exit 1
  74 fi
  75
  76 backup_file "$cfg_chroot/etc/passwd"
  77 backup_file "$cfg_chroot/etc/group"
  78 backup_dir "$cfg_chroot/etc/sshkeys"
  79
  80 exit 0