backup/snap-common

   1 # sourced by snap/lvm and snap/remountrocp
   2
   3 #---------- common arg parsing
   4
   5 nargs=$#
   6 opmode="$1"
   7 vardir="$2"
   8 device="$3"
   9 mountpoint="$4"
  10
  11 lvm_lv=chiark-backup
  12 lvm_lvtools_opts='-A n'
  13 lvm_lvcreate_opts=
  14 lvm_lvcreate_args=
  15
  16 test ! -f /etc/chiark-backup/settings.sh || . /etc/chiark-backup/settings.sh
  17
  18 case "$nargs.$opmode" in
  19 4.snap|2.drop)
  20         ;;
  21 *)
  22         cat >&2 <<END
  23 usage: .../$snapkind snap VARDIR DEV MOUNT
  24        .../$snapkind drop VARDIR
  25 END
  26         exit 1
  27         ;;
  28 esac
  29
  30 #---------- common functions
  31
  32 lvmdropcore () {
  33         snmnt="$vardir/snap-mount"
  34         umount -v "$snmnt" || true
  35         test ! -d "$snmnt" || rmdir -- "$snmnt"
  36
  37         set +e
  38         old_lv_dev="$(readlink $vardir/snap-device)"
  39         rc=$?
  40         set -e
  41
  42         if [ $rc = 0 ]; then
  43                 set +e
  44                 lvchange    $lvm_lvtools_opts -a n $old_lv_dev
  45                 lvremove -f $lvm_lvtools_opts      $old_lv_dev
  46                 set -e
  47                 rm $vardir/snap-device
  48         fi
  49 }
  50
  51 lvmextentscore1 () {
  52         vgdisplay_out="$(really vgdisplay -c "$vgroup")"
  53         extents="$(printf "%s" "$vgdisplay_out" | awk -F: '{print $16}')"
  54         extsize="$(printf "%s" "$vgdisplay_out" | awk -F: '{print $13}')"
  55 }
  56
  57 lvmextentscore2 () {
  58         if [ $extents2 -lt $extents ]; then extents=$extents2; fi
  59         lvm_lvsize_opts="-l $extents"
  60 }
  61
  62 lvmcreatecore1 () {
  63         lvpath="/dev/$vgroup/$lvm_lv"
  64         ln -s -- "$lvpath" "$vardir"/snap-device
  65         sync
  66 }