6
Usage: ${0##*/} image size [output]
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Resize a UEC image to a new size.
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if output is given, do not modify 'image', but create new file 'output'
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New size is specified per resize2fs(8), e.g. "1G" for 1 gigabyte
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error() { echo "$@" 1>&2; }
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fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
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# converts size suitable for input to resize2fs to bytes
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# s:512 byte sectors, K:kilobytes, M:megabytes, G:gigabytes
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# none: block size of the image
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local input=${1} defunit=${2:-1024}
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*s) count=${input%s}; unit=512;;
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*K) count=${input%K}; unit=1024;;
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*M) count=${input%M}; unit=$((1024*1024));;
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*G) count=${input%G}; unit=$((1024*1024*1024));;
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*) count=${input} ; unit=${2:-1024};;
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_RET=$((${count}*${unit}))
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[ "$1" = "-h" -o "$1" = "--help" ] && { Usage; exit 0; }
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[ $# -eq 3 -o $# -eq 2 ] || { Usage 1>&2; exit 1; }
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human2bytes "${size}" && new_size=${_RET} ||
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fail "failed to understand ${size}"
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if [ ! "${old}" -ef "${new}" ]; then
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file_out=$(file "${old}") || fail "failed to read ${old} with 'file'"
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zcat -f "$old" | cp --sparse=always /dev/stdin "$new";;
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*) cp --sparse=always "${old}" "${new}";;
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[ $? -eq 0 ] || fail "failed to cp ${old} -> ${new}"
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ls_out=$(ls -l "${new}") &&
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old_size=$(echo "${ls_out}" | awk '{print $5}') ||
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fail "failed to get size of ${new_img}"
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e2fsck -fp "$new" || fail "failed to fsck ${new}"
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if [ "${old_size}" -lt "${new_size}" ]; then
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truncate "--size=$size" "$new" || fail "failed to change size of ${new}"
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resize2fs "$new" "$size" || fail "failed to resize ${new} -> ${size}"
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if [ "${old_size}" -gt "${new_size}" ]; then
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truncate "--size=$size" "$new" || fail "failed to change size of ${new}"
added
removed
resize-uec-image
