Initial debug and error checking version
This commit is contained in:
framp
parent
fd6c0b1ba4
commit
8a0637b3da
156
pishrink.sh
156
pishrink.sh
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@ -1,24 +1,69 @@
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#!/bin/bash
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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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version="v0.1"
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function info() {
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echo "$1..."
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}
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usage() { echo "Usage: $0 [-s] imagefile.img [newimagefile.img]"; exit -1; }
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function error() {
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echo -n "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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usage() { echo "Usage: $0 [-sd] imagefile.img [newimagefile.img]"; exit -1; }
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should_skip_autoexpand=false
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debug=false
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while getopts ":s" opt; do
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while getopts ":sd" opt; do
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case "${opt}" in
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s) should_skip_autoexpand=true ;;
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d) debug=true;;
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*) usage ;;
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esac
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done
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shift $((OPTIND-1))
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CURRENT_DIR=$(pwd)
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SCRIPTNAME="${0##*/}"
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LOGFILE=${CURRENT_DIR}/${SCRIPTNAME%.*}.log
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if [ "$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="$1"
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#Usage checks
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@ -26,11 +71,11 @@ if [[ -z "$img" ]]; then
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usage
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fi
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if [[ ! -f "$img" ]]; then
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echo "ERROR: $img is not a file..."
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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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echo "ERROR: You need to be running as root."
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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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@ -38,17 +83,17 @@ fi
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for command in parted losetup tune2fs md5sum e2fsck resize2fs; do
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which $command 2>&1 >/dev/null
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if (( $? != 0 )); then
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echo "ERROR: $command is not installed."
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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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echo "Copying $1 to $2..."
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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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echo "ERROR: Could not copy file..."
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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 "$1")
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@ -60,15 +105,36 @@ fi
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trap cleanup ERR EXIT
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#Gather info
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info "Gatherin data"
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beforesize=$(ls -lh "$img" | cut -d ' ' -f 5)
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parted_output=$(parted -ms "$img" unit B print | tail -n 1)
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logVariables $LINENO beforesize
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if ! parted_output=$(parted -ms "$img" unit B print); then
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rc=$?
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error $LINENO "parted failed with rc $rc"
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exit -6
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fi
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parted_output=$(tail -n 1 <<< $parted_output)
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logVariables $LINENO parted_output
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partnum=$(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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logVariables $LINENO partnum partstart
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info "Mounting image"
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if ! loopback=$(losetup -f --show -o $partstart "$img"); then
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rc=$?
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error $LINENO "losetup failed with rc $rc"
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exit -7
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fi
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if ! tune2fs_output=$(tune2fs -l "$loopback"); then
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error $LINENO "tunefs failed"
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exit -8
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fi
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currentsize=$(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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@ -146,43 +212,81 @@ else
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fi
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#Make sure filesystem is ok
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e2fsck -p -f "$loopback"
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minsize=$(resize2fs -P "$loopback" | cut -d ':' -f 2 | tr -d ' ')
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info "Checking filesystem"
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if ! e2fsck -p -f "$loopback"; then
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rc=$?
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error $LINENO "fsck failed with rc $rc"
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exit -9
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fi
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if ! minsize=$(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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echo "ERROR: Image already shrunk to smallest size"
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exit -6
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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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echo "ERROR: resize2fs failed..."
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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 "$loopback"
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exit -7
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exit -12
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fi
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sleep 1
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#Shrink partition
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partnewsize=$(($minsize * $blocksize))
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newpartend=$(($partstart + $partnewsize))
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parted -s -a minimal "$img" rm $partnum >/dev/null
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parted -s "$img" unit B mkpart primary $partstart $newpartend >/dev/null
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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 $rc"
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exit -14
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fi
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#Truncate the file
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endresult=$(parted -ms "$img" unit B print free | tail -1 | cut -d ':' -f 2 | tr -d 'B')
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truncate -s $endresult "$img"
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aftersize=$(ls -lh "$img" | cut -d ' ' -f 5)
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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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echo "Shrunk $img from $beforesize to $aftersize"
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endresult=$(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 $rc"
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exit -16
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aftersize=$(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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