/usr/bin/resize-part-image is in cloud-image-utils 0.27-0ubuntu9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | #!/bin/sh
#
# cloud-resize-image - resize a cloud image
#
# Copyright (C) 2010 Canonical Ltd.
#
# Authors: Scott Moser <smoser@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
Usage() {
cat <<EOF
Usage: ${0##*/} [ options ] image size [output]
Resize a partition image and contained filesystem to a new size.
if output is given, do not modify 'image', but create new file 'output'
New size is specified per resize2fs(8), e.g. "1G" for 1 gigabyte
options:
-v | --verbose show command output
EOF
return 0
}
error() { echo "$@" 1>&2; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
human2bytes() {
# converts size suitable for input to resize2fs to bytes
# s:512 byte sectors, K:kilobytes, M:megabytes, G:gigabytes
# none: block size of the image
local input=${1} defunit=${2:-1024}
local unit count;
case "$input" in
*s) count=${input%s}; unit=512;;
*K) count=${input%K}; unit=1024;;
*M) count=${input%M}; unit=$((1024*1024));;
*G) count=${input%G}; unit=$((1024*1024*1024));;
*) count=${input} ; unit=${2:-1024};;
esac
_RET=$((${count}*${unit}))
}
xtruncate() {
if which truncate >/dev/null 2>&1; then
truncate "${@}"
else
local size=${1} file=${2} blk=""
size=${size#--size=}
# this is a poor mans truncate supporting whatever human2bytes supports
human2bytes "${size}" && blk=$((${_RET}/512)) &&
dd if=/dev/zero of="${file}" obs=512 seek=${blk} count=0 2>/dev/null
fi
}
runcmd() {
local output=$1
shift;
if [ "$output" = "0" ]; then
local out="" ret=0;
out=$("${@}" 2>&1) || { ret=$?; error "${out}"; return $ret; }
else
"$@"
fi
}
[ "$1" = "-h" -o "$1" = "--help" ] && { Usage; exit 0; }
verbose=0
[ "$1" = "-v" -o "$1" = "--verbose" ] &&
{ verbose=1; shift; }
[ "${CLOUD_UTILS_WARN_RESIZE:-0}" = "0" ] && _n="${0##*/}" &&
[ "${_n#uec}" != "${_n}" ] && export CLOUD_UTILS_WARN_RESIZE=1 &&
error "WARNING: uec-resize-image is now 'resize-part-image'. Please update your tools or docs."
[ $# -eq 3 -o $# -eq 2 ] || { Usage 1>&2; exit 1; }
old="$1"
size="$2"
new="${3:-${old}}"
[ -f "${old}" ] || fail "${old}: does not exist"
human2bytes "${size}" && new_size=${_RET} ||
fail "failed to understand ${size}"
if [ ! "${old}" -ef "${new}" ]; then
file_out=$(file "${old}") || fail "failed to read ${old} with 'file'"
case "${file_out}" in
*gzip\ compressed*)
file_out_z=$(file -z "${old}")
case "${file_out_z}" in
*tar\ archive*)
: > "${new}" && newd=$(dirname "${new}") ||
fail "failed to get full path for ${new}"
tmpd=$(mktemp -d "${newd}/.${0##*/}.XXXXXX") &&
( cd "${tmpd}" && tar -S --wildcards -xzf - "*.img" &&
mv *.img "../${new}" ) < "${old}" || {
rm -Rf "${tmpd}";
fail "failed to extract image from ${old}"
}
rm -Rf "${tmpd}"
;;
*)
zcat -f "$old" | cp --sparse=always /dev/stdin "$new";;
esac
;;
*) cp --sparse=always "${old}" "${new}";;
esac
[ $? -eq 0 ] || fail "failed to cp ${old} -> ${new}"
else
# if old=new (in place), it must be a simple image file
case "${old}" in
*.gz) fail "refusing work in place compressed or archive file: ${old}";;
esac
fi
ls_out=$(ls -l "${new}") &&
old_size=$(echo "${ls_out}" | awk '{print $5}') ||
fail "failed to get size of ${new_img}"
runcmd "${verbose}" e2fsck -fp "${new}" ||
fail "failed to fsck ${new}"
if [ "${old_size}" -lt "${new_size}" ]; then
xtruncate "--size=$size" "$new" || fail "failed to change size of ${new}"
fi
runcmd "${verbose}" resize2fs "$new" "$size" ||
fail "failed to resize ${new} -> ${size}"
if [ "${old_size}" -gt "${new_size}" ]; then
xtruncate "--size=$size" "$new" || fail "failed to change size of ${new}"
fi
echo "resized ${new} to ${size}"
exit 0
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