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#!/bin/sh # Copyright (C) 2011 Canonical Ltd. # Copyright (C) 2013 Hewlett-Packard Development Company, L.P. # # Authors: Scott Moser <smoser@canonical.com> # Juerg Haefliger <juerg.haefliger@hp.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/>. # the fudge factor. if within this many bytes dont bother FUDGE=${GROWPART_FUDGE:-$((1024*1024))} TEMP_D="" RESTORE_FUNC="" RESTORE_HUMAN="" VERBOSITY=0 DISK="" PART="" PT_UPDATE=false DRY_RUN=0 SFDISK_VERSION="" SFDISK_2_26="22600" SFDISK_V_WORKING_GPT="22603" MBR_BACKUP="" GPT_BACKUP="" _capture="" error() { echo "$@" 1>&2 } fail() { [ $# -eq 0 ] || echo "FAILED:" "$@" exit 2 } nochange() { echo "NOCHANGE:" "$@" exit 1 } changed() { echo "CHANGED:" "$@" exit 0 } change() { echo "CHANGE:" "$@" exit 0 } cleanup() { if [ -n "${RESTORE_FUNC}" ]; then error "***** WARNING: Resize failed, attempting to revert ******" if ${RESTORE_FUNC} ; then error "***** Appears to have gone OK ****" else error "***** FAILED! ******" if [ -n "${RESTORE_HUMAN}" -a -f "${RESTORE_HUMAN}" ]; then error "**** original table looked like: ****" cat "${RESTORE_HUMAN}" 1>&2 else error "We seem to have not saved the partition table!" fi fi fi [ -z "${TEMP_D}" -o ! -d "${TEMP_D}" ] || rm -Rf "${TEMP_D}" } debug() { local level=${1} shift [ "${level}" -gt "${VERBOSITY}" ] && return if [ "${DEBUG_LOG}" ]; then echo "$@" >>"${DEBUG_LOG}" else error "$@" fi } debugcat() { local level="$1" shift; [ "${level}" -gt "$VERBOSITY" ] && return if [ "${DEBUG_LOG}" ]; then cat "$@" >>"${DEBUG_LOG}" else cat "$@" 1>&2 fi } mktemp_d() { # just a mktemp -d that doens't need mktemp if its not there. _RET=$(mktemp -d "${TMPDIR:-/tmp}/${0##*/}.XXXXXX" 2>/dev/null) && return _RET=$(umask 077 && t="${TMPDIR:-/tmp}/${0##*/}.$$" && mkdir "${t}" && echo "${t}") return } Usage() { cat <<EOF ${0##*/} disk partition rewrite partition table so that partition takes up all the space it can options: -h | --help print Usage and exit --fudge F if part could be resized, but change would be less than 'F' bytes, do not resize (default: ${FUDGE}) -N | --dry-run only report what would be done, show new 'sfdisk -d' -v | --verbose increase verbosity / debug -u | --update R update the the kernel partition table info after growing this requires kernel support and 'partx --update' R is one of: - 'auto' : [default] update partition if possible - 'force' : try despite sanity checks (fail on failure) - 'off' : do not attempt - 'on' : fail if sanity checks indicate no support Example: - ${0##*/} /dev/sda 1 Resize partition 1 on /dev/sda EOF } bad_Usage() { Usage 1>&2 error "$@" exit 2 } sfdisk_restore_legacy() { sfdisk --no-reread "${DISK}" -I "${MBR_BACKUP}" } sfdisk_restore() { # files are named: sfdisk-<device>-<offset>.bak local f="" offset="" fails=0 for f in "${MBR_BACKUP}"*.bak; do [ -f "$f" ] || continue offset=${f##*-} offset=${offset%.bak} [ "$offset" = "$f" ] && { error "WARN: confused by file $f"; continue; } dd "if=$f" "of=${DISK}" seek=$(($offset)) bs=1 conv=notrunc || { error "WARN: failed restore from $f"; fails=$(($fails+1)); } done return $fails } sfdisk_worked_but_blkrrpart_failed() { local ret="$1" output="$2" # exit code found was just 1, but dont insist on that #[ $ret -eq 1 ] || return 1 # Successfully wrote the new partition table grep -qi "Success.* wrote.* new.* partition" "$output" && grep -qi "BLKRRPART: Device or resource busy" "$output" return } get_sfdisk_version() { # set SFDISK_VERSION to MAJOR*10000+MINOR*100+MICRO local out oifs="$IFS" ver="" [ -n "$SFDISK_VERSION" ] && return 0 # expected output: sfdisk from util-linux 2.25.2 out=$(sfdisk --version) || { error "failed to get sfdisk version"; return 1; } set -- $out ver=$4 case "$ver" in [0-9]*.[0-9]*.[0-9]|[0-9].[0-9]*) IFS="."; set -- $ver; IFS="$oifs" SFDISK_VERSION=$(($1*10000+$2*100+${3:-0})) return 0;; *) error "unexpected output in sfdisk --version [$out]" return 1;; esac } resize_sfdisk() { local humanpt="${TEMP_D}/recovery" local mbr_backup="${TEMP_D}/orig.save" local restore_func="" local format="$1" local change_out=${TEMP_D}/change.out local dump_out=${TEMP_D}/dump.out local new_out=${TEMP_D}/new.out local dump_mod=${TEMP_D}/dump.mod local tmp="${TEMP_D}/tmp.out" local err="${TEMP_D}/err.out" local mbr_max_512="4294967296" local pt_start pt_size pt_end max_end new_size change_info dpart local sector_num sector_size disk_size tot out rqe sfd_list sfdisk --list --unit=S "$DISK" >"$tmp" || fail "failed: sfdisk --list $DISK" if [ "${SFDISK_VERSION}" -lt ${SFDISK_2_26} ]; then # exected output contains: Units: sectors of 512 bytes, ... out=$(awk '$1 == "Units:" && $5 ~ /bytes/ { print $4 }' "$tmp") || fail "failed to read sfdisk output" if [ -z "$out" ]; then error "WARN: sector size not found in sfdisk output, assuming 512" sector_size=512 else sector_size="$out" fi local _w _cyl _w1 _heads _w2 sectors _w3 t s # show-size is in units of 1024 bytes (same as /proc/partitions) t=$(sfdisk --show-size "${DISK}") || fail "failed: sfdisk --show-size $DISK" disk_size=$((t*1024)) sector_num=$(($disk_size/$sector_size)) msg="disk size '$disk_size' not evenly div by sector size '$sector_size'" [ "$((${disk_size}%${sector_size}))" -eq 0 ] || error "WARN: $msg" restore_func=sfdisk_restore_legacy else # --list first line output: # Disk /dev/vda: 20 GiB, 21474836480 bytes, 41943040 sectors local _x read _x _x _x _x disk_size _x sector_num _x < "$tmp" sector_size=$((disk_size/$sector_num)) restore_func=sfdisk_restore fi debug 1 "$sector_num sectors of $sector_size. total size=${disk_size} bytes" rqe sfd_dump sfdisk --unit=S --dump "${DISK}" >"${dump_out}" || fail "failed to dump sfdisk info for ${DISK}" RESTORE_HUMAN="$dump_out" { echo "## sfdisk --unit=S --dump ${DISK}" cat "${dump_out}" } >"$humanpt" [ $? -eq 0 ] || fail "failed to save sfdisk -d output" RESTORE_HUMAN="$humanpt" debugcat 1 "$humanpt" sed -e 's/,//g; s/start=/start /; s/size=/size /' "${dump_out}" \ >"${dump_mod}" || fail "sed failed on dump output" dpart="${DISK}${PART}" # disk and partition number if [ -b "${DISK}p${PART}" -a "${DISK%[0-9]}" != "${DISK}" ]; then # for block devices that end in a number (/dev/nbd0) # the partition is "<name>p<partition_number>" (/dev/nbd0p1) dpart="${DISK}p${PART}" elif [ "${DISK#/dev/loop[0-9]}" != "${DISK}" ]; then # for /dev/loop devices, sfdisk output will be <name>p<number> # format also, even though there is not a device there. dpart="${DISK}p${PART}" fi pt_start=$(awk '$1 == pt { print $4 }' "pt=${dpart}" <"${dump_mod}") && pt_size=$(awk '$1 == pt { print $6 }' "pt=${dpart}" <"${dump_mod}") && [ -n "${pt_start}" -a -n "${pt_size}" ] && pt_end=$((${pt_size}+${pt_start})) || fail "failed to get start and end for ${dpart} in ${DISK}" # find the minimal starting location that is >= pt_end max_end=$(awk '$3 == "start" { if($4 >= pt_end && $4 < min) { min = $4 } } END { printf("%s\n",min); }' \ min=${sector_num} pt_end=${pt_end} "${dump_mod}") && [ -n "${max_end}" ] || fail "failed to get max_end for partition ${PART}" if [ "$format" = "gpt" ]; then # sfdisk respects 'last-lba' in input, and complains about # partitions that go past that. without it, it does the right thing. sed -i '/^last-lba:/d' "$dump_out" || fail "failed to remove last-lba from output" fi if [ "$format" = "dos" ]; then mbr_max_sectors=$((mbr_max_512*$((sector_size/512)))) if [ "$max_end" -gt "$mbr_max_sectors" ]; then max_end=$mbr_max_sectors fi [ $(($disk_size/512)) -gt $mbr_max_512 ] && debug 0 "WARNING: MBR/dos partitioned disk is larger than 2TB." \ "Additional space will go unused." fi local gpt_second_size="33" if [ "${max_end}" -gt "$((${sector_num}-${gpt_second_size}))" ]; then # if mbr allow subsequent conversion to gpt without shrinking the # partition. safety net at cost of 33 sectors, seems reasonable. # if gpt, we can't write there anyway. debug 1 "padding ${gpt_second_size} sectors for gpt secondary header" max_end=$((${sector_num}-${gpt_second_size})) fi debug 1 "max_end=${max_end} tot=${sector_num} pt_end=${pt_end}" \ "pt_start=${pt_start} pt_size=${pt_size}" [ $((${pt_end})) -eq ${max_end} ] && nochange "partition ${PART} is size ${pt_size}. it cannot be grown" [ $((${pt_end}+(${FUDGE}/$sector_size))) -gt ${max_end} ] && nochange "partition ${PART} could only be grown by" \ "$((${max_end}-${pt_end})) [fudge=$((${FUDGE}/$sector_size))]" # now, change the size for this partition in ${dump_out} to be the # new size new_size=$((${max_end}-${pt_start})) sed "\|^\s*${dpart} |s/${pt_size},/${new_size},/" "${dump_out}" \ >"${new_out}" || fail "failed to change size in output" change_info="partition=${PART} start=${pt_start} old: size=${pt_size} end=${pt_end} new: size=${new_size},end=${max_end}" if [ ${DRY_RUN} -ne 0 ]; then echo "CHANGE: ${change_info}" { echo "# === old sfdisk -d ===" cat "${dump_out}" echo "# === new sfdisk -d ===" cat "${new_out}" } 1>&2 exit 0 fi MBR_BACKUP="${mbr_backup}" LANG=C sfdisk --no-reread "${DISK}" --force \ -O "${mbr_backup}" <"${new_out}" >"${change_out}" 2>&1 ret=$? [ $ret -eq 0 ] || RESTORE_FUNC="${restore_func}" if [ $ret -eq 0 ]; then : elif $PT_UPDATE && sfdisk_worked_but_blkrrpart_failed "$ret" "${change_out}"; then # if the command failed, but it looks like only because # the device was busy and we have pt_update, then go on debug 1 "sfdisk failed, but likely only because of blkrrpart" else error "attempt to resize ${DISK} failed. sfdisk output below:" sed 's,^,| ,' "${change_out}" 1>&2 fail "failed to resize" fi rq pt_update pt_update "$DISK" "$PART" || fail "pt_resize failed" RESTORE_FUNC="" changed "${change_info}" # dump_out looks something like: ## partition table of /tmp/out.img #unit: sectors # #/tmp/out.img1 : start= 1, size= 48194, Id=83 #/tmp/out.img2 : start= 48195, size= 963900, Id=83 #/tmp/out.img3 : start= 1012095, size= 305235, Id=82 #/tmp/out.img4 : start= 1317330, size= 771120, Id= 5 #/tmp/out.img5 : start= 1317331, size= 642599, Id=83 #/tmp/out.img6 : start= 1959931, size= 48194, Id=83 #/tmp/out.img7 : start= 2008126, size= 80324, Id=83 } gpt_restore() { sgdisk -l "${GPT_BACKUP}" "${DISK}" } resize_sgdisk() { GPT_BACKUP="${TEMP_D}/pt.backup" local pt_info="${TEMP_D}/pt.info" local pt_pretend="${TEMP_D}/pt.pretend" local pt_data="${TEMP_D}/pt.data" local out="${TEMP_D}/out" local dev="disk=${DISK} partition=${PART}" local pt_start pt_end pt_size last pt_max code guid name new_size local old new change_info sector_size # Dump the original partition information and details to disk. This is # used in case something goes wrong and human interaction is required # to revert any changes. rqe sgd_info sgdisk "--info=${PART}" --print "${DISK}" >"${pt_info}" || fail "${dev}: failed to dump original sgdisk info" RESTORE_HUMAN="${pt_info}" sector_size=$(awk '$0 ~ /^Logical sector size:.*bytes/ { print $4 }' \ "$pt_info") && [ -n "$sector_size" ] || { sector_size=512 error "WARN: did not find sector size, assuming 512" } debug 1 "$dev: original sgdisk info:" debugcat 1 "${pt_info}" # Pretend to move the backup GPT header to the end of the disk and dump # the resulting partition information. We use this info to determine if # we have to resize the partition. rqe sgd_pretend sgdisk --pretend --move-second-header \ --print "${DISK}" >"${pt_pretend}" || fail "${dev}: failed to dump pretend sgdisk info" debug 1 "$dev: pretend sgdisk info" debugcat 1 "${pt_pretend}" # Extract the partition data from the pretend dump awk 'found { print } ; $1 == "Number" { found = 1 }' \ "${pt_pretend}" >"${pt_data}" || fail "${dev}: failed to parse pretend sgdisk info" # Get the start and end sectors of the partition to be grown pt_start=$(awk '$1 == '"${PART}"' { print $2 }' "${pt_data}") && [ -n "${pt_start}" ] || fail "${dev}: failed to get start sector" pt_end=$(awk '$1 == '"${PART}"' { print $3 }' "${pt_data}") && [ -n "${pt_end}" ] || fail "${dev}: failed to get end sector" pt_size="$((${pt_end} - ${pt_start}))" # Get the last usable sector last=$(awk '/last usable sector is/ { print $NF }' \ "${pt_pretend}") && [ -n "${last}" ] || fail "${dev}: failed to get last usable sector" # Find the minimal start sector that is >= pt_end pt_max=$(awk '{ if ($2 >= pt_end && $2 < min) { min = $2 } } END \ { print min }' min="${last}" pt_end="${pt_end}" \ "${pt_data}") && [ -n "${pt_max}" ] || fail "${dev}: failed to find max end sector" debug 1 "${dev}: pt_start=${pt_start} pt_end=${pt_end}" \ "pt_size=${pt_size} pt_max=${pt_max} last=${last}" # Check if the partition can be grown [ "${pt_end}" -eq "${pt_max}" ] && nochange "${dev}: size=${pt_size}, it cannot be grown" [ "$((${pt_end} + ${FUDGE}/${sector_size}))" -gt "${pt_max}" ] && nochange "${dev}: could only be grown by" \ "$((${pt_max} - ${pt_end})) [fudge=$((${FUDGE}/$sector_size))]" # The partition can be grown if we made it here. Get some more info # about it so we can do it properly. # FIXME: Do we care about the attribute flags? code=$(awk '/^Partition GUID code:/ { print $4 }' "${pt_info}") guid=$(awk '/^Partition unique GUID:/ { print $4 }' "${pt_info}") name=$(awk '/^Partition name:/ { gsub(/'"'"'/, "") ; \ if (NF >= 3) print substr($0, index($0, $3)) }' "${pt_info}") [ -n "${code}" -a -n "${guid}" ] || fail "${dev}: failed to parse sgdisk details" debug 1 "${dev}: code=${code} guid=${guid} name='${name}'" local wouldrun="" [ "$DRY_RUN" -ne 0 ] && wouldrun="would-run" # Calculate the new size of the partition new_size=$((${pt_max} - ${pt_start})) old="old: size=${pt_size},end=${pt_end}" new="new: size=${new_size},end=${pt_max}" change_info="${dev}: start=${pt_start} ${old} ${new}" # Backup the current partition table, we're about to modify it rq sgd_backup $wouldrun sgdisk "--backup=${GPT_BACKUP}" "${DISK}" || fail "${dev}: failed to backup the partition table" # Modify the partition table. We do it all in one go (the order is # important!): # - move the GPT backup header to the end of the disk # - delete the partition # - recreate the partition with the new size # - set the partition code # - set the partition GUID # - set the partition name rq sgdisk_mod $wouldrun sgdisk --move-second-header "--delete=${PART}" \ "--new=${PART}:${pt_start}:${pt_max}" \ "--typecode=${PART}:${code}" \ "--partition-guid=${PART}:${guid}" \ "--change-name=${PART}:${name}" "${DISK}" && rq pt_update $wouldrun pt_update "$DISK" "$PART" || { RESTORE_FUNC=gpt_restore fail "${dev}: failed to repartition" } # Dry run [ "${DRY_RUN}" -ne 0 ] && change "${change_info}" changed "${change_info}" } kver_to_num() { local kver="$1" maj="" min="" mic="0" kver=${kver%%-*} maj=${kver%%.*} min=${kver#${maj}.} min=${min%%.*} mic=${kver#${maj}.${min}.} [ "$kver" = "$mic" ] && mic=0 _RET=$(($maj*1000*1000+$min*1000+$mic)) } kver_cmp() { local op="$2" n1="" n2="" kver_to_num "$1" n1="$_RET" kver_to_num "$3" n2="$_RET" [ $n1 $op $n2 ] } rq() { # runquieterror(label, command) # gobble stderr of a command unless it errors local label="$1" ret="" efile="" efile="$TEMP_D/$label.err" shift; local rlabel="running" [ "$1" = "would-run" ] && rlabel="would-run" && shift local cmd="" x="" for x in "$@"; do [ "${x#* }" != "$x" -o "${x#* \"}" != "$x" ] && x="'$x'" cmd="$cmd $x" done cmd=${cmd# } debug 2 "$rlabel[$label][$_capture]" "$cmd" [ "$rlabel" = "would-run" ] && return 0 if [ "${_capture}" = "erronly" ]; then "$@" 2>"$TEMP_D/$label.err" ret=$? else "$@" >"$TEMP_D/$label.err" 2>&1 ret=$? fi if [ $ret -ne 0 ]; then error "failed [$label:$ret]" "$@" cat "$efile" 1>&2 fi return $ret } rqe() { local _capture="erronly" rq "$@" } verify_ptupdate() { local input="$1" found="" reason="" kver="" # we can always satisfy 'off' if [ "$input" = "off" ]; then _RET="false"; return 0; fi if command -v partx >/dev/null 2>&1; then local out="" ret=0 out=$(partx --help 2>&1) ret=$? if [ $ret -eq 0 ]; then echo "$out" | grep -q -- --update || { reason="partx has no '--update' flag in usage." found="off" } else reason="'partx --help' returned $ret. assuming it is old." found="off" fi else reason="no 'partx' command" found="off" fi if [ -z "$found" ]; then if [ "$(uname)" != "Linux" ]; then reason="Kernel is not Linux per uname." found="off" fi fi if [ -z "$found" ]; then kver=$(uname -r) || debug 1 "uname -r failed!" if ! kver_cmp "${kver-0.0.0}" -ge 3.8.0; then reason="Kernel '$kver' < 3.8.0." found="off" fi fi if [ -z "$found" ]; then _RET="true" return 0 fi case "$input" in on) error "$reason"; return 1;; auto) _RET="false"; debug 1 "partition update disabled: $reason" return 0;; force) _RET="true" error "WARNING: ptupdate forced on even though: $reason" return 0;; esac error "unknown input '$input'"; return 1; } pt_update() { local dev="$1" part="$2" update="${3:-$PT_UPDATE}" if ! $update; then return 0 fi # partx only works on block devices (do not run on file) [ -b "$dev" ] || return 0 partx --update "$part" "$dev" } has_cmd() { command -v "${1}" >/dev/null 2>&1 } resize_sgdisk_gpt() { resize_sgdisk gpt } resize_sgdisk_dos() { fail "unable to resize dos label with sgdisk" } resize_sfdisk_gpt() { resize_sfdisk gpt } resize_sfdisk_dos() { resize_sfdisk dos } get_table_format() { local out="" disk="$1" if has_cmd blkid && out=$(blkid -o value -s PTTYPE "$disk") && [ "$out" = "dos" -o "$out" = "gpt" ]; then _RET="$out" return fi _RET="dos" if [ ${SFDISK_VERSION} -lt ${SFDISK_2_26} ] && out=$(sfdisk --id --force "$disk" 1 2>/dev/null); then if [ "$out" = "ee" ]; then _RET="gpt" else _RET="dos" fi return elif out=$(LANG=C sfdisk --list "$disk"); then out=$(echo "$out" | sed -e '/Disklabel type/!d' -e 's/.*: //') case "$out" in gpt|dos) _RET="$out";; *) error "WARN: unknown label $out";; esac fi } get_resizer() { local format="$1" user=${2:-"auto"} case "$user" in sgdisk) _RET="resize_sgdisk_$format"; return;; sfdisk) _RET="resize_sfdisk_$format"; return;; auto) :;; *) error "unexpected input: '$user'";; esac if [ "$format" = "dos" ]; then _RET="resize_sfdisk_dos" return 0 fi if [ "${SFDISK_VERSION}" -ge ${SFDISK_V_WORKING_GPT} ]; then # sfdisk 2.26.2 works for resize but loses type (LP: #1474090) _RET="resize_sfdisk_gpt" elif has_cmd sgdisk; then _RET="resize_sgdisk_$format" else error "no tools available to resize disk with '$format'" return 1 fi return 0 } pt_update="auto" resizer=${GROWPART_RESIZER:-"auto"} while [ $# -ne 0 ]; do cur=${1} next=${2} case "$cur" in -h|--help) Usage exit 0 ;; --fudge) FUDGE=${next} shift ;; -N|--dry-run) DRY_RUN=1 ;; -u|--update|--update=*) if [ "${cur#--update=}" != "$cur" ]; then next="${cur#--update=}" else shift fi case "$next" in off|auto|force|on) pt_update=$next;; *) fail "unknown --update option: $next";; esac ;; -v|--verbose) VERBOSITY=$(($VERBOSITY+1)) ;; --) shift break ;; -*) fail "unknown option ${cur}" ;; *) if [ -z "${DISK}" ]; then DISK=${cur} else [ -z "${PART}" ] || fail "confused by arg ${cur}" PART=${cur} fi ;; esac shift done [ -n "${DISK}" ] || bad_Usage "must supply disk and partition-number" [ -n "${PART}" ] || bad_Usage "must supply partition-number" has_cmd "sfdisk" || fail "sfdisk not found" get_sfdisk_version || fail [ -e "${DISK}" ] || fail "${DISK}: does not exist" [ "${PART#*[!0-9]}" = "${PART}" ] || fail "partition-number must be a number" verify_ptupdate "$pt_update" || fail PT_UPDATE=$_RET debug 1 "update-partition set to $PT_UPDATE" mktemp_d && TEMP_D="${_RET}" || fail "failed to make temp dir" trap cleanup 0 # EXIT - some shells may not like 'EXIT' but are ok with 0 # get the ID of the first partition to determine if it's MBR or GPT get_table_format "$DISK" || fail format=$_RET get_resizer "$format" "$resizer" || fail "failed to get a resizer for id '$id'" resizer=$_RET debug 1 "resizing $PART on $DISK using $resizer" "$resizer" # vi: ts=4 noexpandtab