diff --git a/README.md b/README.md index e80200a..54cbd9b 100644 --- a/README.md +++ b/README.md @@ -1,9 +1,8 @@ # PiShrink # -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. -In addition the shrinked image can be compressed with gzip and xz to create an even smaller image. Parallel compression of the image -using multiple cores is supported. +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. +In addition the shrinked image can be compressed with gzip and xz to create an even smaller image. Parallel compression of the image using multiple cores is supported. ## Usage ## @@ -13,8 +12,11 @@ Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img] -s Don't expand filesystem when image is booted the first time -v Be verbose -r Use advanced filesystem repair option if the normal one fails - -z Compress image after shrinking with gzip - -Z Compress image after shrinking with xz + -z Compress image after shrinking with gzip (Default is balanced (6) compression) + -Z Compress image after shrinking with xz (Default is balanced (6) compression) + -c Change the compression level from the default, balanced (6) to fast (1 for gzip, 0 or xz) + -C Change the compression level from the default, balanced (6) to best (9) + -e Compress image in extreme mode (Only applicable to xz compression) -a Compress image in parallel using multiple cores -p Remove logs, apt archives, dhcp leases and ssh hostkeys -d Write debug messages in a debug log file @@ -22,24 +24,27 @@ Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img] 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. -* `-s` prevents automatic filesystem expantion on the images next boot -* `-v` enables more verbose output -* `-r` will attempt to repair the filesystem using aditional options if the normal repair fails -* `-z` will compress the image after shrinking using gzip. `.gz` extension will be added to the filename. -* `-Z` will compress the image after shrinking using xz. `.xz` extension will be added to the filename. -* `-a` will use option -f9 for pigz and option -T0 for xz and compress in parallel. -* `-d` will create a logfile `pishrink.log` which may help for problem analysis. +* `-s` Prevents automatic filesystem expantion on the images next boot. +* `-v` Enables more verbose output. +* `-r` Will attempt to repair the filesystem using aditional options if the normal repair fails. +* `-z` Will compress the image after shrinking using gzip. `.gz` extension will be added to the filename. +* `-Z` Will compress the image after shrinking using xz. `.xz` extension will be added to the filename. +* `-c Will use option -1 for pigz and option -0 for xz. +* `-C Will use option -9. +* `-e Will use option -e for xz. +* `-a` will use option -f for pigz and option -T0 for xz and compress in parallel. +* `-d` will create a logfile `pishrink.log` which may help for problem analysis. -Default options for compressors can be overwritten by defining PISHRINK_GZIP or PSHRINK_XZ environment variables for gzip and xz. +Default options for compressors can be overwritten by defining PISHRINK_GZIP or PSHRINK_XZ environment variables for gzip and xz. ## Prerequisites ## If you are running PiShrink in VirtualBox you will likely encounter an error if you attempt to use VirtualBox's "Shared Folder" feature. You can copy the image you wish to shrink on to the VM from a Shared Folder, but shrinking directctly from the Shared Folder -is know to cause issues. +is know to cause issues. -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. +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. ## Installation ## @@ -76,6 +81,6 @@ Shrunk pi.img from 30G to 3.1G ## Contributing ## -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. +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. -Pull requests for new features and bug fixes are more than welcome! +Pull requests for new features and bug fixes are more than welcome! \ No newline at end of file diff --git a/pishrink.sh b/pishrink.sh index 623f736..d162ebd 100755 --- a/pishrink.sh +++ b/pishrink.sh @@ -8,9 +8,9 @@ MYNAME="${SCRIPTNAME%.*}" LOGFILE="${CURRENT_DIR}/${SCRIPTNAME%.*}.log" REQUIRED_TOOLS="parted losetup tune2fs md5sum e2fsck resize2fs" ZIPTOOLS=("gzip xz") -declare -A ZIP_PARALLEL_TOOL=( [gzip]="pigz" [xz]="xz" ) # parallel zip tool to use in parallel mode -declare -A ZIP_PARALLEL_OPTIONS=( [gzip]="-f9" [xz]="-T0" ) # options for zip tools in parallel mode -declare -A ZIPEXTENSIONS=( [gzip]="gz" [xz]="xz" ) # extensions of zipped files +declare -A ZIP_PARALLEL_TOOL=( [gzip]="pigz" [xz]="xz" ) # Parallel zip tool to use in parallel mode +declare -A ZIP_PARALLEL_OPTIONS=( [gzip]="-f" [xz]="-T0" ) # Options for zip tools in parallel mode +declare -A ZIPEXTENSIONS=( [gzip]="gz" [xz]="xz" ) # Extensions of zipped files function info() { echo "$SCRIPTNAME: $1 ..." @@ -160,9 +160,12 @@ Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img] -s Don't expand filesystem when image is booted the first time -v Be verbose -r Use advanced filesystem repair option if the normal one fails - -z Compress image after shrinking with gzip - -Z Compress image after shrinking with xz + -z Compress image after shrinking with gzip (Default is balanced (6) compression) + -Z Compress image after shrinking with xz (Default is balanced (6) compression) -a Compress image in parallel using multiple cores + -c Change the compression level from the default, balanced (6) to fast (1 for gzip, 0 or xz) + -C Change the compression level from the default, balanced (6) to best (9) + -e Compress image in extreme mode (Only applicable to xz compression) -p Remove logs, apt archives, dhcp leases and ssh hostkeys -d Write debug messages in a debug log file EOM @@ -171,17 +174,22 @@ EOM } should_skip_autoexpand=false +compression=6 debug=false +extreme=false repair=false parallel=false verbose=false prep=false ziptool="" -while getopts ":adhprsvzZ" opt; do +while getopts ":acCdehprsvzZ" opt; do case "${opt}" in a) parallel=true;; + c) compression=0;; + C) compression=9;; d) debug=true;; + e) extreme=true;; h) help;; p) prep=true;; r) repair=true;; @@ -194,6 +202,10 @@ while getopts ":adhprsvzZ" opt; do done shift $((OPTIND-1)) +if [ $compression == 0 ] && [[ "$ziptool" == "gzip" ]]; then + compression=1 +fi + if [ "$debug" = true ]; then info "Creating log file $LOGFILE" rm "$LOGFILE" &>/dev/null @@ -203,11 +215,11 @@ fi echo "${0##*/} $version" -#Args +# Args src="$1" img="$1" -#Usage checks +# Usage checks if [[ -z "$img" ]]; then help fi @@ -221,7 +233,7 @@ if (( EUID != 0 )); then exit 3 fi -# check selected compression tool is supported and installed +# Check selected compression tool is supported and installed if [[ -n $ziptool ]]; then if [[ ! " ${ZIPTOOLS[@]} " =~ $ziptool ]]; then error $LINENO "$ziptool is an unsupported ziptool." @@ -235,7 +247,7 @@ if [[ -n $ziptool ]]; then fi fi -#Check that what we need is installed +# Check that what we need is installed for command in $REQUIRED_TOOLS; do command -v $command >/dev/null 2>&1 if (( $? != 0 )); then @@ -244,10 +256,10 @@ for command in $REQUIRED_TOOLS; do fi done -#Copy to new file if requested +# Copy to new file if requested if [ -n "$2" ]; then f="$2" - if [[ -n $ziptool && "${f##*.}" == "${ZIPEXTENSIONS[$ziptool]}" ]]; then # remove zip extension if zip requested because zip tool will complain about extension + if [[ -n $ziptool && "${f##*.}" == "${ZIPEXTENSIONS[$ziptool]}" ]]; then # Remove zip extension if zip requested because zip tool will complain about extension f="${f%.*}" fi info "Copying $1 to $f..." @@ -261,10 +273,10 @@ if [ -n "$2" ]; then img="$f" fi -# cleanup at script exit +# Cleanup at script exit trap cleanup EXIT -#Gather info +# Gather info info "Gathering data" beforesize="$(ls -lh "$img" | cut -d ' ' -f 5)" parted_output="$(parted -ms "$img" unit B print)" @@ -295,7 +307,7 @@ blocksize="$(echo "$tune2fs_output" | grep '^Block size:' | tr -d ' ' | cut -d ' logVariables $LINENO beforesize parted_output partnum partstart parttype tune2fs_output currentsize blocksize -#Check if we should make pi expand rootfs on next boot +# Check if we should make pi expand rootfs on next boot if [ "$parttype" == "logical" ]; then echo "WARNING: PiShrink does not yet support autoexpanding of this type of image" elif [ "$should_skip_autoexpand" = false ]; then @@ -313,7 +325,7 @@ if [[ $prep == true ]]; then fi -#Make sure filesystem is ok +# Make sure filesystem is ok checkFilesystem if ! minsize=$(resize2fs -P "$loopback"); then @@ -328,7 +340,7 @@ if [[ $currentsize -eq $minsize ]]; then exit 11 fi -#Add some free space to the end of the filesystem +# Add some free space to the end of the filesystem extra_space=$(($currentsize - $minsize)) logVariables $LINENO extra_space for space in 5000 1000 100; do @@ -339,7 +351,7 @@ for space in 5000 1000 100; do done logVariables $LINENO minsize -#Shrink filesystem +# Shrink filesystem info "Shrinking filesystem" resize2fs -p "$loopback" $minsize rc=$? @@ -353,7 +365,7 @@ if (( $rc )); then fi sleep 1 -#Shrink partition +# Shrink partition partnewsize=$(($minsize * $blocksize)) newpartend=$(($partstart + $partnewsize)) logVariables $LINENO partnewsize newpartend @@ -371,7 +383,7 @@ if (( $rc )); then exit 14 fi -#Truncate the file +# Truncate the file info "Shrinking image" endresult=$(parted -ms "$img" unit B print free) rc=$? @@ -389,13 +401,15 @@ if (( $rc )); then exit 16 fi -# handle compression +# Handle the 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 + [[ $compression != 6 ]] && options="$options -$compression" # Update the compression value if requested (default value is 6) + [[ "$ziptool" == "xz" ]] && [[ $extreme == true ]] && options="$options -e" # Add extreme flag if requested for xz + [[ -v $envVarname ]] && options="${!envVarname}" # If environment variables defined use these options + [[ $verbose == true ]] && options="$options -v" # Add verbose flag if requested if [[ $parallel == true ]]; then parallel_tool="${ZIP_PARALLEL_TOOL[$ziptool]}" @@ -406,7 +420,7 @@ if [[ -n $ziptool ]]; then exit 18 fi - else # sequential + else # Sequential info "Using $ziptool on the shrunk image" if ! $ziptool ${options} "$img"; then rc=$? @@ -414,6 +428,7 @@ if [[ -n $ziptool ]]; then exit 19 fi fi + img=$img.${ZIPEXTENSIONS[$ziptool]} fi