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Replace `expr` with bash built-in arithmetic, and tidy up free-space calculation

This commit is contained in:
Andrew Scheller 2018-01-22 03:31:19 +00:00
parent 8331faf8f3
commit 201db16c93
1 changed files with 9 additions and 9 deletions
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18
pishrink.sh
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@ -143,13 +143,13 @@ if [[ $currentsize -eq $minsize ]]; then
fi
#Add some free space to the end of the filesystem
if [[ $(expr $currentsize - $minsize - 5000) -gt 0 ]]; then
minsize=$(expr $minsize + 5000)
elif [[ $(expr $currentsize - $minsize - 1000) -gt 0 ]]; then
minsize=$(expr $minsize + 1000)
elif [[ $(expr $currentsize - $minsize - 100) -gt 0 ]]; then
minsize=$(expr $minsize + 100)
fi
extra_space=$(($currentsize - $minsize))
for space in 5000 1000 100; do
if [[ $extra_space -gt $space ]]; then
minsize=$(($minsize + $space))
break
fi
done
#Shrink filesystem
resize2fs -p "$loopback" $minsize
@ -165,8 +165,8 @@ sleep 1
#Shrink partition
losetup -d "$loopback"
partnewsize=$(expr $minsize \* $blocksize)
newpartend=$(expr $partstart + $partnewsize)
partnewsize=$(($minsize * $blocksize))
newpartend=$(($partstart + $partnewsize))
parted -s "$img" rm $partnum >/dev/null
parted -s "$img" unit B mkpart primary $partstart $newpartend >/dev/null