github.com/kaisenlinux/docker.io@v0.0.0-20230510090727-ea55db55fac7/engine/contrib/nuke-graph-directory.sh (about)

     1  #!/usr/bin/env bash
     2  set -e
     3  
     4  dir="$1"
     5  
     6  if [ -z "$dir" ]; then
     7  	{
     8  		echo 'This script is for destroying old /var/lib/docker directories more safely than'
     9  		echo '  "rm -rf", which can cause data loss or other serious issues.'
    10  		echo
    11  		echo "usage: $0 directory"
    12  		echo "   ie: $0 /var/lib/docker"
    13  	} >&2
    14  	exit 1
    15  fi
    16  
    17  if [ "$(id -u)" != 0 ]; then
    18  	echo >&2 "error: $0 must be run as root"
    19  	exit 1
    20  fi
    21  
    22  if [ ! -d "$dir" ]; then
    23  	echo >&2 "error: $dir is not a directory"
    24  	exit 1
    25  fi
    26  
    27  dir="$(readlink -f "$dir")"
    28  
    29  echo
    30  echo "Nuking $dir ..."
    31  echo '  (if this is wrong, press Ctrl+C NOW!)'
    32  echo
    33  
    34  (
    35  	set -x
    36  	sleep 10
    37  )
    38  echo
    39  
    40  dir_in_dir() {
    41  	inner="$1"
    42  	outer="$2"
    43  	[ "${inner#$outer}" != "$inner" ]
    44  }
    45  
    46  # let's start by unmounting any submounts in $dir
    47  #   (like -v /home:... for example - DON'T DELETE MY HOME DIRECTORY BRU!)
    48  for mount in $(awk '{ print $5 }' /proc/self/mountinfo); do
    49  	mount="$(readlink -f "$mount" || true)"
    50  	if [ "$dir" != "$mount" ] && dir_in_dir "$mount" "$dir"; then
    51  		(
    52  			set -x
    53  			umount -f "$mount"
    54  		)
    55  	fi
    56  done
    57  
    58  # now, let's go destroy individual btrfs subvolumes, if any exist
    59  if command -v btrfs > /dev/null 2>&1; then
    60  	# Find btrfs subvolumes under $dir checking for inode 256
    61  	# Source: http://stackoverflow.com/a/32865333
    62  	for subvol in $(find "$dir" -type d -inum 256 | sort -r); do
    63  		if [ "$dir" != "$subvol" ]; then
    64  			(
    65  				set -x
    66  				btrfs subvolume delete "$subvol"
    67  			)
    68  		fi
    69  	done
    70  fi
    71  
    72  # finally, DESTROY ALL THINGS
    73  (
    74  	shopt -s dotglob
    75  	set -x
    76  	rm -rf "$dir"/*
    77  )