346 lines
8.1 KiB
Bash
Executable File
346 lines
8.1 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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LOGFILE=${CURRENT_DIR}/${SCRIPTNAME%.*}.log
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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: $0 [-sdrpzh] imagefile.img [newimagefile.img]
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-s: Don't expand filesystem when image is booted the first time
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-d: Write debug messages in a debug log file
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-r: Use advanced filesystem repair option if the normal one fails
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-p: Remove logs, apt archives, dhcp leases and ssh hostkeys
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-z: Gzip compress image after shrinking
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EOM
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echo "$help"
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exit -1
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}
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usage() {
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echo "Usage: $0 [-sdrpzh] imagefile.img [newimagefile.img]"
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echo ""
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echo " -s: Skip autoexpand"
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echo " -d: Debug mode on"
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echo " -r: Use advanced repair options"
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echo " -p: Remove logs, apt archives, dhcp leases and ssh hostkeys"
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echo " -z: Gzip compress image after shrinking"
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echo " -h: display help text"
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exit -1
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}
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should_skip_autoexpand=false
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debug=false
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repair=false
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gzip_compress=false
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prep=false
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while getopts ":sdrpzh" opt; do
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case "${opt}" in
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s) should_skip_autoexpand=true ;;
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d) debug=true;;
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r) repair=true;;
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p) prep=true;;
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z) gzip_compress=true;;
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h) help;;
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*) usage ;;
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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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usage
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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 that what we need is installed
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for command in parted losetup tune2fs md5sum e2fsck resize2fs; 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 "$img" | cut -d ' ' -f 5)
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if ! parted_output=$(parted -ms "$img" unit B print); then
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rc=$?
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error $LINENO "parted failed with rc $rc"
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info "Possibly invalid image. Run 'parted $img unit B print' manually to investigate"
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exit -6
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fi
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parted_output=$(echo "$parted_output" | tail -n 1)
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partnum=$(echo "$parted_output" | cut -d ':' -f 1)
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partstart=$(echo "$parted_output" | cut -d ':' -f 2 | tr -d 'B')
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loopback=$(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 $LINENO tune2fs_output currentsize blocksize
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#Check if we should make pi expand rootfs on next boot
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if [ "$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 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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if [[ $? != 0 ]]; then
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error $LINENO "resize2fs failed"
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mount "$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 $LINENO partnewsize newpartend
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if ! parted -s -a minimal "$img" rm "$partnum"; then
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rc=$?
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error $LINENO "parted failed with rc $rc"
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exit -13
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fi
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if ! parted -s "$img" unit B mkpart primary "$partstart" "$newpartend"; then
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rc=$?
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error $LINENO "parted failed with rc $rc"
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exit -14
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fi
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#Truncate the file
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info "Shrinking image"
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if ! endresult=$(parted -ms "$img" unit B print free); then
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rc=$?
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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 $LINENO endresult
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if ! truncate -s "$endresult" "$img"; then
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rc=$?
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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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if [[ $gzip_compress == true ]]; then
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info "Gzipping the shrunk image"
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if [[ ! $(gzip -f9 "$img") ]]; then
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img=$img.gz
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fi
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fi
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aftersize=$(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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