94 lines
2.1 KiB
Bash
Executable File
94 lines
2.1 KiB
Bash
Executable File
#!/bin/bash
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usage() { echo "Usage: $0 imagefile.img [newimagefile.img]"; exit -1; }
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#Args
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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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echo "ERROR: $img is not a file..."
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exit -2
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fi
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#Check that what we need is installed
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for command in tune2fs 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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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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cp "$1" "$2"
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if (( $? != 0 )); then
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echo "ERROR: Could not copy file..."
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exit -5
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fi
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img="$2"
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fi
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#Gather info
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beforesize=$(ls -lh "$img" | tr -s " " | cut -d " " -f 5)
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partnum=$(fdisk "$img" | grep Linux | cut -d ":" -f1 | tr -d " ")
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partstart=$(fdisk -d "$img" | grep 0x83 | cut -d "," -f1)
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loopback=$(hdiutil attach -nomount "$img" | grep Linux | cut -d " " -f1)
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tune2fs_output=$(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 "$tune2fs_output" | grep '^Block size:' | tr -d ' ' | cut -d ':' -f 2)
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#Make sure filesystem is ok, force yes on all questions
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e2fsck -y -f "$loopback"
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minsize=$(resize2fs -P "$loopback" | cut -d ':' -f 2 | tr -d ' ')
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# add ~200 MB of extra space, the system may need it to run
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minsize=$(($minsize + 50000))
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if [[ $minsize -gt $currentsize ]]; then
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echo "ERROR: Image already shrunk to smallest size"
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exit -6
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fi
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#Shrink filesystem
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resize2fs -p "$loopback" $minsize
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if [[ $? != 0 ]]; then
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echo "ERROR: resize2fs failed..."
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hdiutil detach $loopback
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exit -7
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fi
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sleep 1
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#Shrink partition
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hdiutil detach $loopback
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# fdisk uses a block size of 512 Bytes!
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partnewsize=$(($minsize * $blocksize / 512))
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newpartend=$(($partstart + $partnewsize))
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# now use fdisk to change the partition
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fdisk -e "$img" <<EOF2
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e $partnum
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$newpartend
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w
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q
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EOF2
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sleep 1
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#Truncate the file
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endresult=$(($partnewsize + 1))
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dd if="$img" of="$img-shrinked.img" bs=512 count=$endresult
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aftersize=$(ls -lh "$img-shrinked.img" | tr -s " " | cut -d " " -f 5)
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rm -f "$img"
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mv "$img-shrinked.img" "$img"
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echo "Shrunk $img from $beforesize to $aftersize"
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