Updated to original copy
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nhkhai
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39
README.md
39
README.md
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@ -1,31 +1,48 @@
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# PiShrink #
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PiShrink is a bash script that automatically shrink a pi image that will then resize to the max size of the SD card on boot. This will make putting the image back onto the SD card faster and the shrunk images will compress better.
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In addition the shrinked image can be compressed with gzip and xz to create an even smaller image. Parallel compression of the image
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using multiple cores is supported.
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## Usage ##
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```
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sudo pishrink.sh [-sdrzh] imagefile.img [newimagefile.img]
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-s: Skip autoexpand
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-d: Debug mode on
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-r: Use advanced repair options
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-z: Gzip compress image after shrinking
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-h: display help text
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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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```
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If you specify the `newimagefile.img` parameter, the script will make a copy of `imagefile.img` and work off that. You will need enough space to make a full copy of the image to use that option.
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* `-s` will skip the autoexpanding part of the process.
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* `-s` prevents automatic filesystem expantion on the images next boot
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* `-v` enables more verbose output
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* `-r` will attempt to repair the filesystem using aditional options if the normal repair fails
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* `-z` will compress the image after shrinking using gzip. `.gz` extension will be added to the filename.
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* `-Z` will compress the image after shrinking using xz. `.xz` extension will be added to the filename.
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* `-a` will use option -f9 for pigz and option -T0 for xz and compress in parallel.
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* `-d` will create a logfile `pishrink.log` which may help for problem analysis.
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* `-r` will attempt to repair the filesystem if regular repairs fail
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* `-z` will Gzip compress the image after shrinking. The `.gz` extension will be added to the filename.
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Default options for compressors can be overwritten by defining PISHRINK_GZIP or PSHRINK_XZ environment variables for gzip and xz.
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## Prerequisites ##
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If you are trying to shrink a [NOOBS](https://github.com/raspberrypi/noobs) image it will likely fail. This is due to [NOOBS partitioning](https://github.com/raspberrypi/noobs/wiki/NOOBS-partitioning-explained) being significantly different than Raspbian's. Hopefully PiShrink will be able to support NOOBS in the near future.
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If you are running PiShrink in VirtualBox you will likely encounter an error if you
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attempt to use VirtualBox's "Shared Folder" feature. You can copy the image you wish to
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shrink on to the VM from a Shared Folder, but shrinking directctly from the Shared Folder
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is know to cause issues.
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If using Ubuntu, you will likely see an error about `e2fsck` being out of date and `metadata_csum`. The simplest fix for this is to use Ubuntu 16.10 and up, as it will save you a lot of hassle in the long run.
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## Installation ##
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```bash
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wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
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chmod +x pishrink.sh
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@ -33,6 +50,7 @@ sudo mv pishrink.sh /usr/local/bin
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```
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## Example ##
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```bash
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[user@localhost PiShrink]$ sudo pishrink.sh pi.img
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e2fsck 1.42.9 (28-Dec-2013)
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@ -57,6 +75,7 @@ Shrunk pi.img from 30G to 3.1G
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```
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## Contributing ##
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If you find a bug please create an issue for it. If you would like a new feature added, you can create an issue for it but I can't promise that I will get to it.
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Pull requests for new features and bug fixes are more than welcome!
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403
pishrink.sh
403
pishrink.sh
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@ -2,12 +2,18 @@
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version="v0.1.2"
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CURRENT_DIR=$(pwd)
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CURRENT_DIR="$(pwd)"
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SCRIPTNAME="${0##*/}"
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LOGFILE=${CURRENT_DIR}/${SCRIPTNAME%.*}.log
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MYNAME="${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: $1..."
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echo "$SCRIPTNAME: $1 ..."
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}
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function error() {
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@ -56,137 +62,28 @@ if [[ $repair == true ]]; then
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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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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: $0 [-sdrpzh] imagefile.img [newimagefile.img]
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function set_autoexpand() {
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#Make pi expand rootfs on next boot
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mountdir=$(mktemp -d)
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partprobe "$loopback"
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mount "$loopback" "$mountdir"
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-s: Don't expand filesystem when image is booted the first time
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-d: Write debug messages in a debug log file
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-r: Use advanced filesystem repair option if the normal one fails
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-p: Remove logs, apt archives, dhcp leases and ssh hostkeys
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-x: XZ compress image after shrinking
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-e: XZ extreme compress image after shrinking
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-z: Gzip compress image after shrinking
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EOM
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echo "$help"
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exit -1
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}
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if [ ! -d "$mountdir/etc" ]; then
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info "/etc not found, autoexpand will not be enabled"
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umount "$mountdir"
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return
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fi
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usage() {
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echo "Usage: $0 [-sdrpzh] imagefile.img [newimagefile.img]"
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echo ""
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echo " -s: Skip autoexpand"
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echo " -d: Debug mode on"
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echo " -r: Use advanced repair options"
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echo " -p: Remove logs, apt archives, dhcp leases and ssh hostkeys"
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echo " -x: XZ compress image after shrinking"
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echo " -e: XZ extreme compress image after shrinking"
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echo " -z: Gzip compress image after shrinking"
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echo " -h: display help text"
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exit -1
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}
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if [[ -f "$mountdir/etc/rc.local" ]] && [[ "$(md5sum "$mountdir/etc/rc.local" | cut -d ' ' -f 1)" != "1c579c7d5b4292fd948399b6ece39009" ]]; then
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echo "Creating new /etc/rc.local"
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if [ -f "$mountdir/etc/rc.local" ]; then
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mv "$mountdir/etc/rc.local" "$mountdir/etc/rc.local.bak"
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fi
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should_skip_autoexpand=false
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debug=false
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repair=false
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xzip_compress=false
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exzip_compress=false
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gzip_compress=false
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prep=false
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while getopts ":sdrpxezh" opt; do
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case "${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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x) xzip_compress=true;;
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e) exzip_compress=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 "$img" | cut -d ' ' -f 5)
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parted_output=$(parted -ms "$img" unit B print | tail -n 1)
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partnum=$(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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@ -243,13 +140,166 @@ 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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if [[ -f /etc/rc.local.bak ]]; then
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cp -f /etc/rc.local.bak /etc/rc.local
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/etc/rc.local
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fi
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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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}
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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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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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umount "$mountdir"
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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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f="$2"
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if [[ -n $ziptool && "${f##*.}" == "${ZIPEXTENSIONS[$ziptool]}" ]]; then # remove zip extension if zip requested because zip tool will complain about extension
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f="${f%.*}"
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fi
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info "Copying $1 to $f..."
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cp --reflink=auto --sparse=always "$1" "$f"
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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" "$f"
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img="$f"
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fi
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# cleanup at script exit
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trap cleanup 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 "$parted_output" | tail -n 1 | cut -d ':' -f 2 | tr -d 'B')"
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if [ -z "$(parted -s "$img" unit B print | grep "$partstart" | grep logical)" ]; then
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parttype="primary"
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else
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parttype="logical"
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fi
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loopback="$(losetup -f --show -o "$partstart" "$img")"
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tune2fs_output="$(tune2fs -l "$loopback")"
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rc=$?
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if (( $rc )); then
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echo "$tune2fs_output"
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error $LINENO "tune2fs failed. Unable to shrink this type of image"
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exit 7
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fi
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currentsize="$(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 $LINENO beforesize parted_output partnum partstart parttype tune2fs_output currentsize blocksize
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#Check if we should make pi expand rootfs on next boot
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if [ "$parttype" == "logical" ]; then
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echo "WARNING: PiShrink does not yet support autoexpanding of this type of image"
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elif [ "$should_skip_autoexpand" = false ]; then
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set_autoexpand
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else
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echo "Skipping autoexpanding process..."
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fi
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|
|
@ -262,22 +312,23 @@ if [[ $prep == true ]]; then
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umount "$mountdir"
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fi
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# Make sure filesystem is ok
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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 $rc"
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exit -10
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exit 10
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||||
fi
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minsize=$(cut -d ':' -f 2 <<< "$minsize" | tr -d ' ')
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logVariables $LINENO minsize
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logVariables $LINENO currentsize minsize
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if [[ $currentsize -eq $minsize ]]; then
|
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error $LINENO "Image already shrunk to smallest size"
|
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exit -11
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exit 11
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||||
fi
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||||
|
||||
# Add some free space to the end of the filesystem
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#Add some free space to the end of the filesystem
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extra_space=$(($currentsize - $minsize))
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logVariables $LINENO extra_space
|
||||
for space in 5000 1000 100; do
|
||||
|
|
@ -288,70 +339,82 @@ for space in 5000 1000 100; do
|
|||
done
|
||||
logVariables $LINENO minsize
|
||||
|
||||
# Shrink filesystem
|
||||
#Shrink filesystem
|
||||
info "Shrinking filesystem"
|
||||
resize2fs -p "$loopback" $minsize
|
||||
if [[ $? != 0 ]]; then
|
||||
error $LINENO "resize2fs failed"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "resize2fs failed with rc $rc"
|
||||
mount "$loopback" "$mountdir"
|
||||
mv "$mountdir/etc/rc.local.bak" "$mountdir/etc/rc.local"
|
||||
umount "$mountdir"
|
||||
losetup -d "$loopback"
|
||||
exit -12
|
||||
exit 12
|
||||
fi
|
||||
sleep 1
|
||||
|
||||
# Shrink partition
|
||||
#Shrink partition
|
||||
partnewsize=$(($minsize * $blocksize))
|
||||
newpartend=$(($partstart + $partnewsize))
|
||||
logVariables $LINENO partnewsize newpartend
|
||||
if ! parted -s -a minimal "$img" rm "$partnum"; then
|
||||
rc=$?
|
||||
parted -s -a minimal "$img" rm "$partnum"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit -13
|
||||
exit 13
|
||||
fi
|
||||
|
||||
if ! parted -s "$img" unit B mkpart primary "$partstart" "$newpartend"; then
|
||||
rc=$?
|
||||
parted -s "$img" unit B mkpart "$parttype" "$partstart" "$newpartend"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit -14
|
||||
exit 14
|
||||
fi
|
||||
|
||||
# Truncate the file
|
||||
#Truncate the file
|
||||
info "Shrinking image"
|
||||
if ! endresult=$(parted -ms "$img" unit B print free); then
|
||||
rc=$?
|
||||
endresult=$(parted -ms "$img" unit B print free)
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit -15
|
||||
exit 15
|
||||
fi
|
||||
|
||||
endresult=$(tail -1 <<< "$endresult" | cut -d ':' -f 2 | tr -d 'B')
|
||||
logVariables $LINENO endresult
|
||||
if ! truncate -s "$endresult" "$img"; then
|
||||
rc=$?
|
||||
truncate -s "$endresult" "$img"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "trunate failed with rc $rc"
|
||||
exit -16
|
||||
exit 16
|
||||
fi
|
||||
|
||||
if [[ $xzip_compress == true ]]; then
|
||||
info "XZipping the shrunk image"
|
||||
if [[ ! $(xz -9v "$img") ]]; then
|
||||
img=$img.xz
|
||||
fi
|
||||
fi
|
||||
# handle compression
|
||||
if [[ -n $ziptool ]]; then
|
||||
options=""
|
||||
envVarname="${MYNAME^^}_${ziptool^^}" # PISHRINK_GZIP or PISHRINK_XZ environment variables allow to override all options for gzip or xz
|
||||
[[ $parallel == true ]] && options="${ZIP_PARALLEL_OPTIONS[$ziptool]}"
|
||||
[[ -v $envVarname ]] && options="${!envVarname}" # if environment variable defined use these options
|
||||
[[ $verbose == true ]] && options="$options -v" # add verbose flag if requested
|
||||
|
||||
if [[ $exzip_compress == true ]]; then
|
||||
info "Extreme XZipping the shrunk image"
|
||||
if [[ ! $(xz -9ve "$img") ]]; then
|
||||
img=$img.xz
|
||||
fi
|
||||
fi
|
||||
if [[ $parallel == true ]]; then
|
||||
parallel_tool="${ZIP_PARALLEL_TOOL[$ziptool]}"
|
||||
info "Using $parallel_tool on the shrunk image"
|
||||
if ! $parallel_tool ${options} "$img"; then
|
||||
rc=$?
|
||||
error $LINENO "$parallel_tool failed with rc $rc"
|
||||
exit 18
|
||||
fi
|
||||
|
||||
if [[ $gzip_compress == true ]]; then
|
||||
info "Gzipping the shrunk image"
|
||||
if [[ ! $(gzip -f9 "$img") ]]; then
|
||||
img=$img.gz
|
||||
fi
|
||||
else # sequential
|
||||
info "Using $ziptool on the shrunk image"
|
||||
if ! $ziptool ${options} "$img"; then
|
||||
rc=$?
|
||||
error $LINENO "$ziptool failed with rc $rc"
|
||||
exit 19
|
||||
fi
|
||||
fi
|
||||
img=$img.${ZIPEXTENSIONS[$ziptool]}
|
||||
fi
|
||||
|
||||
aftersize=$(ls -lh "$img" | cut -d ' ' -f 5)
|
||||
|
|
|
|||
Loading…
Reference in New Issue