github.com/containers/podman/v2@v2.2.2-0.20210501105131-c1e07d070c4c/contrib/cirrus/add_second_partition.sh (about)

     1  #!/usr/bin/env bash
     2  
     3  # N/B: This script could mega f*!@up your disks if run by mistake.
     4  #      it is left without the execute-bit on purpose!
     5  
     6  set -eo pipefail
     7  
     8  # shellcheck source=./lib.sh
     9  source $(dirname $0)/lib.sh
    10  
    11  # $SLASH_DEVICE is the disk device to be f*xtuP
    12  SLASH_DEVICE="/dev/sda"  # Always the case on GCP
    13  
    14  # The unallocated space results from the difference in disk-size between VM Image
    15  # and runtime request.
    16  NEW_PART_START="50%"
    17  NEW_PART_END="100%"
    18  
    19  
    20  if [[ ! -r "/root" ]] || [[ -r "/root/second_partition_ready" ]]
    21  then
    22      warn "Ignoring attempted execution of $(basename $0)"
    23      exit 0
    24  fi
    25  
    26  [[ -x "$(type -P parted)" ]] || \
    27      die "The parted command is required."
    28  
    29  [[ ! -b ${SLASH_DEVICE}2 ]] || \
    30      die "Found unexpected block device ${SLASH_DEVICE}2"
    31  
    32  PPRINTCMD="parted --script ${SLASH_DEVICE} print"
    33  FINDMNTCMD="findmnt --source=${SLASH_DEVICE}1 --mountpoint=/ --canonicalize --evaluate --first-only --noheadings"
    34  TMPF=$(mktemp -p '' $(basename $0)_XXXX)
    35  trap "rm -f $TMPF" EXIT
    36  
    37  if $FINDMNTCMD | tee $TMPF | egrep -q "^/\s+${SLASH_DEVICE}1"
    38  then
    39      msg "Repartitioning original partition table:"
    40      $PPRINTCMD
    41  else
    42      die "Unexpected output from '$FINDMNTCMD': $(<$TMPF)"
    43  fi
    44  
    45  echo "Adding partition offset within unpartitioned space."
    46  parted --script --align optimal /dev/sda unit % mkpart primary "" "" "$NEW_PART_START" "$NEW_PART_END"
    47  
    48  msg "New partition table:"
    49  $PPRINTCMD
    50  
    51  msg "Growing ${SLASH_DEVICE}1 meet start of ${SLASH_DEVICE}2"
    52  growpart ${SLASH_DEVICE} 1
    53  
    54  FSTYPE=$(findmnt --first-only --noheadings --output FSTYPE ${SLASH_DEVICE}1)
    55  echo "Expanding $FSTYPE filesystem on ${SLASH_DEVICE}1"
    56  case $FSTYPE in
    57      ext*) resize2fs ${SLASH_DEVICE}1 ;;
    58      *) die "Script $(basename $0) doesn't know how to resize a $FSTYPE filesystem." ;;
    59  esac
    60  
    61  # Must happen last - signals completion to other tooling
    62  msg "Recording newly available disk partition device into /root/second_partition_ready"
    63  echo "${SLASH_DEVICE}2" > /root/second_partition_ready