391 lines
9.6 KiB
Bash
Executable File
391 lines
9.6 KiB
Bash
Executable File
#!/bin/bash
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version="v0.1.2"
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CURRENT_DIR="$(pwd)"
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SCRIPTNAME="${0##*/}"
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MYNAME="${SCRIPTNAME%.*}"
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LOGFILE="${CURRENT_DIR}/${SCRIPTNAME%.*}.log"
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REQUIRED_TOOLS="parted losetup tune2fs md5sum e2fsck resize2fs"
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ZIPTOOLS=("gzip xz")
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declare -A ZIP_PARALLEL_TOOL=( [gzip]="pigz" [xz]="xz" ) # parallel zip tool to use in parallel mode
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declare -A ZIP_PARALLEL_OPTIONS=( [gzip]="-f9" [xz]="-T0" ) # options for zip tools in parallel mode
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declare -A ZIPEXTENSIONS=( [gzip]="gz" [xz]="xz" ) # extensions of zipped files
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function info() {
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echo "$SCRIPTNAME: $1 ..."
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}
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function error() {
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echo -n "$SCRIPTNAME: ERROR occured in line $1: "
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shift
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echo "$@"
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}
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function cleanup() {
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if losetup "$loopback" &>/dev/null; then
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losetup -d "$loopback"
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fi
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if [ "$debug" = true ]; then
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local old_owner=$(stat -c %u:%g "$src")
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chown "$old_owner" "$LOGFILE"
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fi
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}
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function logVariables() {
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if [ "$debug" = true ]; then
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echo "Line $1" >> "$LOGFILE"
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shift
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local v var
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for var in "$@"; do
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eval "v=\$$var"
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echo "$var: $v" >> "$LOGFILE"
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done
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fi
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}
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function checkFilesystem() {
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info "Checking filesystem"
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e2fsck -pf "$loopback"
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(( $? < 4 )) && return
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info "Filesystem error detected!"
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info "Trying to recover corrupted filesystem"
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e2fsck -y "$loopback"
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(( $? < 4 )) && return
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if [[ $repair == true ]]; then
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info "Trying to recover corrupted filesystem - Phase 2"
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e2fsck -fy -b 32768 "$loopback"
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(( $? < 4 )) && return
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fi
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error $LINENO "Filesystem recoveries failed. Giving up..."
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exit -9
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}
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help() {
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local help
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read -r -d '' help << EOM
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Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img]
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-s Don't expand filesystem when image is booted the first time
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-v Be verbose
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-r Use advanced filesystem repair option if the normal one fails
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-z Compress image after shrinking with gzip
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-Z Compress image after shrinking with xz
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-a Compress image in parallel using multiple cores
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-p Remove logs, apt archives, dhcp leases and ssh hostkeys
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-d Write debug messages in a debug log file
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EOM
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echo "$help"
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exit -1
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}
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should_skip_autoexpand=false
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debug=false
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repair=false
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parallel=false
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verbose=false
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prep=false
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ziptool=""
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required_tools="$REQUIRED_TOOLS"
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while getopts ":adhprsvzZ" opt; do
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case "${opt}" in
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a) parallel=true;;
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d) debug=true;;
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h) help;;
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p) prep=true;;
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r) repair=true;;
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s) should_skip_autoexpand=true ;;
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v) verbose=true;;
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z) ziptool="gzip";;
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Z) ziptool="xz";;
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*) help;;
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esac
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done
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shift $((OPTIND-1))
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if [ "$debug" = true ]; then
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info "Creating log file $LOGFILE"
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rm "$LOGFILE" &>/dev/null
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exec 1> >(stdbuf -i0 -o0 -e0 tee -a "$LOGFILE" >&1)
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exec 2> >(stdbuf -i0 -o0 -e0 tee -a "$LOGFILE" >&2)
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fi
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echo "${0##*/} $version"
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#Args
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src="$1"
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img="$1"
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#Usage checks
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if [[ -z "$img" ]]; then
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help
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fi
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if [[ ! -f "$img" ]]; then
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error $LINENO "$img is not a file..."
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exit -2
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fi
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if (( EUID != 0 )); then
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error $LINENO "You need to be running as root."
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exit -3
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fi
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# check selected compression tool is supported and installed
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if [[ -n $ziptool ]]; then
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if [[ ! " ${ZIPTOOLS[@]} " =~ " $ziptool " ]]; then
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error $LINENO "$ziptool is an unsupported ziptool."
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exit -17
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else
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if [[ $parallel == true && ziptool == "gzip" ]]; then
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REQUIRED_TOOLS="$REQUIRED_TOOLS pigz"
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else
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REQUIRED_TOOLS="$REQUIRED_TOOLS $ziptool"
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fi
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fi
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fi
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#Check that what we need is installed
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for command in $REQUIRED_TOOLS; do
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command -v $command >/dev/null 2>&1
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if (( $? != 0 )); then
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error $LINENO "$command is not installed."
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exit -4
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fi
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done
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#Copy to new file if requested
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if [ -n "$2" ]; then
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info "Copying $1 to $2..."
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cp --reflink=auto --sparse=always "$1" "$2"
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if (( $? != 0 )); then
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error $LINENO "Could not copy file..."
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exit -5
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fi
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old_owner=$(stat -c %u:%g "$1")
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chown "$old_owner" "$2"
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img="$2"
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fi
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# cleanup at script exit
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trap cleanup ERR EXIT
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#Gather info
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info "Gathering data"
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beforesize="$(ls -lh "$img" | cut -d ' ' -f 5)"
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parted_output="$(parted -ms "$img" unit B print)"
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rc=$?
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if (( $rc )); then
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error $LINENO "parted failed with rc $rc"
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info "Possibly invalid image. Run 'parted $img unit B print' manually to investigate"
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exit -6
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fi
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partnum="$(echo "$parted_output" | tail -n 1 | cut -d ':' -f 1)"
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partstart="$(echo "$parted_output" | tail -n 1 | cut -d ':' -f 2 | tr -d 'B')"
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loopback="$(losetup -f --show -o "$partstart" "$img")"
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tune2fs_output="$(tune2fs -l "$loopback")"
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currentsize="$(echo "$tune2fs_output" | grep '^Block count:' | tr -d ' ' | cut -d ':' -f 2)"
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blocksize="$(echo "$tune2fs_output" | grep '^Block size:' | tr -d ' ' | cut -d ':' -f 2)"
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logVariables $LINENO beforesize parted_output partnum partstart tune2fs_output currentsize blocksize
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#Check if we should make pi expand rootfs on next boot
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if [ "$should_skip_autoexpand" = false ]; then
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#Make pi expand rootfs on next boot
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mountdir=$(mktemp -d)
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mount "$loopback" "$mountdir"
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if [ "$(md5sum "$mountdir/etc/rc.local" | cut -d ' ' -f 1)" != "0542054e9ff2d2e0507ea1ffe7d4fc87" ]; then
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echo "Creating new /etc/rc.local"
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mv "$mountdir/etc/rc.local" "$mountdir/etc/rc.local.bak"
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#####Do not touch the following lines#####
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cat <<\EOF1 > "$mountdir/etc/rc.local"
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#!/bin/bash
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do_expand_rootfs() {
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ROOT_PART=$(mount | sed -n 's|^/dev/\(.*\) on / .*|\1|p')
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PART_NUM=${ROOT_PART#mmcblk0p}
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if [ "$PART_NUM" = "$ROOT_PART" ]; then
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echo "$ROOT_PART is not an SD card. Don't know how to expand"
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return 0
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fi
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# Get the starting offset of the root partition
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PART_START=$(parted /dev/mmcblk0 -ms unit s p | grep "^${PART_NUM}" | cut -f 2 -d: | sed 's/[^0-9]//g')
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[ "$PART_START" ] || return 1
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# Return value will likely be error for fdisk as it fails to reload the
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# partition table because the root fs is mounted
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fdisk /dev/mmcblk0 <<EOF
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p
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d
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$PART_NUM
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n
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p
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$PART_NUM
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$PART_START
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p
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w
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EOF
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cat <<EOF > /etc/rc.local &&
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#!/bin/sh
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echo "Expanding /dev/$ROOT_PART"
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resize2fs /dev/$ROOT_PART
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rm -f /etc/rc.local; cp -f /etc/rc.local.bak /etc/rc.local; /etc/rc.local
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EOF
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reboot
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exit
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}
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raspi_config_expand() {
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/usr/bin/env raspi-config --expand-rootfs
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if [[ $? != 0 ]]; then
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return -1
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else
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rm -f /etc/rc.local; cp -f /etc/rc.local.bak /etc/rc.local; /etc/rc.local
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reboot
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exit
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fi
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}
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raspi_config_expand
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echo "WARNING: Using backup expand..."
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sleep 5
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do_expand_rootfs
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echo "ERROR: Expanding failed..."
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sleep 5
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rm -f /etc/rc.local; cp -f /etc/rc.local.bak /etc/rc.local; /etc/rc.local
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exit 0
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EOF1
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#####End no touch zone#####
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chmod +x "$mountdir/etc/rc.local"
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fi
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umount "$mountdir"
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else
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echo "Skipping autoexpanding process..."
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fi
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if [[ $prep == true ]]; then
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info "Syspreping: Removing logs, apt archives, dhcp leases and ssh hostkeys"
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mountdir=$(mktemp -d)
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mount "$loopback" "$mountdir"
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rm -rf "$mountdir/var/cache/apt/archives/*" "$mountdir/var/lib/dhcpcd5/*" "$mountdir/var/log/*" "$mountdir/var/tmp/*" "$mountdir/tmp/*" "$mountdir/etc/ssh/*_host_*"
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umount "$mountdir"
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fi
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#Make sure filesystem is ok
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checkFilesystem
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if ! minsize=$(resize2fs -P "$loopback"); then
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rc=$?
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error $LINENO "resize2fs failed with rc $rc"
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exit -10
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fi
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minsize=$(cut -d ':' -f 2 <<< "$minsize" | tr -d ' ')
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logVariables $LINENO currentsize minsize
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if [[ $currentsize -eq $minsize ]]; then
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error $LINENO "Image already shrunk to smallest size"
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exit -11
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fi
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#Add some free space to the end of the filesystem
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extra_space=$(($currentsize - $minsize))
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logVariables $LINENO extra_space
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for space in 5000 1000 100; do
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if [[ $extra_space -gt $space ]]; then
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minsize=$(($minsize + $space))
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break
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fi
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done
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logVariables $LINENO minsize
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#Shrink filesystem
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info "Shrinking filesystem"
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resize2fs -p "$loopback" $minsize
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rc=$?
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if (( $rc )); then
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error $LINENO "resize2fs failed with rc $rc"
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mount "$loopback" "$mountdir"
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mv "$mountdir/etc/rc.local.bak" "$mountdir/etc/rc.local"
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umount "$mountdir"
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losetup -d "$loopback"
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exit -12
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fi
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sleep 1
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#Shrink partition
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partnewsize=$(($minsize * $blocksize))
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newpartend=$(($partstart + $partnewsize))
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logVariables $LINENO partnewsize newpartend
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parted -s -a minimal "$img" rm "$partnum"
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rc=$?
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if (( $rc )); then
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error $LINENO "parted failed with rc $rc"
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exit -13
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fi
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parted -s "$img" unit B mkpart primary "$partstart" "$newpartend"
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rc=$?
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if (( $rc )); then
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error $LINENO "parted failed with rc $rc"
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exit -14
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fi
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#Truncate the file
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info "Shrinking image"
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endresult=$(parted -ms "$img" unit B print free)
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rc=$?
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if (( $rc )); then
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error $LINENO "parted failed with rc $rc"
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exit -15
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fi
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endresult=$(tail -1 <<< "$endresult" | cut -d ':' -f 2 | tr -d 'B')
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logVariables $LINENO endresult
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truncate -s "$endresult" "$img"
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rc=$?
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if (( $rc )); then
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error $LINENO "trunate failed with rc $rc"
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exit -16
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fi
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# handle compression
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if [[ -n $ziptool ]]; then
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options=""
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envVarname="${MYNAME^^}_${ziptool^^}" # PISHRINK_GZIP or PISHRINK_XZ environment variables allow to override all options for gzip or xz
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[[ $parallel == true ]] && options="${ZIP_PARALLEL_OPTIONS[$ziptool]}"
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[[ -v $envVarname ]] && options="${!envVarname}" # if environment variable defined use these options
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[[ $verbose == true ]] && options="$options -v" # add verbose flag if requested
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if [[ $parallel == true ]]; then
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parallel_tool="${ZIP_PARALLEL_TOOL[$ziptool]}"
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info "Using $parallel_tool on the shrunk image"
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if ! $parallel_tool ${options} "$img"; then
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rc=$?
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error $LINENO "$parallel_tool failed with rc $rc"
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exit -18
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fi
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else # sequential
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info "Using $ziptool on the shrunk image"
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if ! $ziptool ${options} $img; then
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rc=$?
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error $LINENO "$ziptool failed with rc $rc"
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exit -19
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fi
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fi
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img=$img.${ZIPEXTENSIONS[$ziptool]}
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fi
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aftersize=$(ls -lh "$img" | cut -d ' ' -f 5)
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logVariables $LINENO aftersize
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info "Shrunk $img from $beforesize to $aftersize"
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