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PiShrink
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Use $() for command-substitution instead of backticks

This commit is contained in:
Andrew Scheller 2018-01-22 01:23:54 +00:00
parent 2aa44f0ecd
commit 9d6392d0c2
1 changed files with 22 additions and 22 deletions
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44
pishrink.sh
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@ -29,7 +29,7 @@ if (( EUID != 0 )); then
fi fi
#Check that what we need is installed #Check that what we need is installed
A=`which parted 2>&1` A=$(which parted 2>&1)
if (( $? != 0 )); then if (( $? != 0 )); then
echo "ERROR: parted is not installed." echo "ERROR: parted is not installed."
exit -4 exit -4
@ -47,20 +47,20 @@ if [ -n "$2" ]; then
fi fi
#Gather info #Gather info
beforesize=`ls -lah "$img" | cut -d ' ' -f 5` beforesize=$(ls -lah "$img" | cut -d ' ' -f 5)
partnum=`parted -m "$img" unit B print | tail -n 1 | cut -d ':' -f 1 | tr -d '\n'` partnum=$(parted -m "$img" unit B print | tail -n 1 | cut -d ':' -f 1 | tr -d '\n')
partstart=`parted -m "$img" unit B print | tail -n 1 | cut -d ':' -f 2 | tr -d 'B\n'` partstart=$(parted -m "$img" unit B print | tail -n 1 | cut -d ':' -f 2 | tr -d 'B\n')
loopback=`losetup -f --show -o $partstart "$img"` loopback=$(losetup -f --show -o $partstart "$img")
currentsize=`tune2fs -l $loopback | grep 'Block count' | tr -d ' ' | cut -d ':' -f 2 | tr -d '\n'` currentsize=$(tune2fs -l $loopback | grep 'Block count' | tr -d ' ' | cut -d ':' -f 2 | tr -d '\n')
blocksize=`tune2fs -l $loopback | grep 'Block size' | tr -d ' ' | cut -d ':' -f 2 | tr -d '\n'` blocksize=$(tune2fs -l $loopback | grep 'Block size' | tr -d ' ' | cut -d ':' -f 2 | tr -d '\n')
#Check if we should make pi expand rootfs on next boot #Check if we should make pi expand rootfs on next boot
if [ "$should_skip_autoexpand" = false ]; then if [ "$should_skip_autoexpand" = false ]; then
#Make pi expand rootfs on next boot #Make pi expand rootfs on next boot
mountdir=`mktemp -d` mountdir=$(mktemp -d)
mount $loopback $mountdir mount $loopback $mountdir
if [ `md5sum $mountdir/etc/rc.local | cut -d ' ' -f 1` != "0542054e9ff2d2e0507ea1ffe7d4fc87" ]; then if [ $(md5sum $mountdir/etc/rc.local | cut -d ' ' -f 1) != "0542054e9ff2d2e0507ea1ffe7d4fc87" ]; then
echo Creating new /etc/rc.local echo Creating new /etc/rc.local
mv $mountdir/etc/rc.local $mountdir/etc/rc.local.bak mv $mountdir/etc/rc.local $mountdir/etc/rc.local.bak
#####Do not touch the following lines##### #####Do not touch the following lines#####
@ -132,19 +132,19 @@ fi
#Make sure filesystem is ok #Make sure filesystem is ok
e2fsck -p -f $loopback e2fsck -p -f $loopback
minsize=`resize2fs -P $loopback | cut -d ':' -f 2 | tr -d ' ' | tr -d '\n'` minsize=$(resize2fs -P $loopback | cut -d ':' -f 2 | tr -d ' ' | tr -d '\n')
if [[ $currentsize -eq $minsize ]]; then if [[ $currentsize -eq $minsize ]]; then
echo ERROR: Image already shrunk to smallest size echo ERROR: Image already shrunk to smallest size
exit -6 exit -6
fi fi
#Add some free space to the end of the filesystem #Add some free space to the end of the filesystem
if [[ `expr $currentsize - $minsize - 5000` -gt 0 ]]; then if [[ $(expr $currentsize - $minsize - 5000) -gt 0 ]]; then
minsize=`expr $minsize + 5000 | tr -d '\n'` minsize=$(expr $minsize + 5000 | tr -d '\n')
elif [[ `expr $currentsize - $minsize - 1000` -gt 0 ]]; then elif [[ $(expr $currentsize - $minsize - 1000) -gt 0 ]]; then
minsize=`expr $minsize + 1000 | tr -d '\n'` minsize=$(expr $minsize + 1000 | tr -d '\n')
elif [[ `expr $currentsize - $minsize - 100` -gt 0 ]]; then elif [[ $(expr $currentsize - $minsize - 100) -gt 0 ]]; then
minsize=`expr $minsize + 100 | tr -d '\n'` minsize=$(expr $minsize + 100 | tr -d '\n')
fi fi
#Shrink filesystem #Shrink filesystem
@ -161,14 +161,14 @@ sleep 1
#Shrink partition #Shrink partition
losetup -d $loopback losetup -d $loopback
partnewsize=`expr $minsize \* $blocksize | tr -d '\n'` partnewsize=$(expr $minsize \* $blocksize | tr -d '\n')
newpartend=`expr $partstart + $partnewsize | tr -d '\n'` newpartend=$(expr $partstart + $partnewsize | tr -d '\n')
part1=`parted "$img" rm $partnum` part1=$(parted "$img" rm $partnum)
part2=`parted "$img" unit B mkpart primary $partstart $newpartend` part2=$(parted "$img" unit B mkpart primary $partstart $newpartend)
#Truncate the file #Truncate the file
endresult=`parted -m "$img" unit B print free | tail -1 | cut -d ':' -f 2 | tr -d 'B\n'` endresult=$(parted -m "$img" unit B print free | tail -1 | cut -d ':' -f 2 | tr -d 'B\n')
truncate -s $endresult "$img" truncate -s $endresult "$img"
aftersize=`ls -lah "$img" | cut -d ' ' -f 5` aftersize=$(ls -lah "$img" | cut -d ' ' -f 5)
echo "Shrunk $img from $beforesize to $aftersize" echo "Shrunk $img from $beforesize to $aftersize"