mirror of
https://github.com/lisanet/PiShrink-macOS.git
synced 2026-03-13 02:53:48 +00:00
0b8020ac18
This will speed up the copy process on some filesystems by writing less to the disk. CoW filesystems will perform the best
87 lines
2.2 KiB
Bash
Executable File
87 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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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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echo "Usage: $0 imagefile.img [newimagefile.img]"
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exit -1
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fi
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if [[ ! -e $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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if (( EUID != 0 )); then
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echo "ERROR: 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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A=`which parted 2>&1`
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if (( $? != 0 )); then
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echo "ERROR: parted is not installed."
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exit -4
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fi
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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 --reflink=auto --sparse=always "$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 -lah $img | cut -d ' ' -f 5`
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partnum=`parted -m $img unit B print | tail -n 1 | cut -d ':' -f 1 | tr -d '\n'`
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partstart=`parted -m $img unit B print | tail -n 1 | cut -d ':' -f 2 | tr -d 'B\n'`
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loopback=`losetup -f --show -o $partstart $img`
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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` != "a27a4d8192ea6ba713d2ddd15a55b1df" ]; 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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cat <<\EOF > $mountdir/etc/rc.local
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#!/bin/bash
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/usr/bin/raspi-config --expand-rootfs
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rm -f /etc/rc.local; cp -f /etc/rc.local.bak /etc/rc.local; reboot
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exit 0
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EOF
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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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#Shrink filesystem
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e2fsck -f $loopback
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minsize=`resize2fs -P $loopback | cut -d ':' -f 2 | tr -d ' '`
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minsize=`expr $minsize + 20000 | tr -d '\n'`
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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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mount $loopback $mountdir
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mv $mountdir/etc/rc.local.bak $mountdir/etc/rc.local
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umount $mountdir
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losetup -d $loopback
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exit $rc
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fi
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sleep 1
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#Shrink partition
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losetup -d $loopback
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partnewsize=`expr $minsize \* 4096 | tr -d '\n'`
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newpartend=`expr $partstart + $partnewsize | tr -d '\n'`
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part1=`parted $img rm $partnum`
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part2=`parted $img unit B mkpart primary $partstart $newpartend`
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#Truncate the file
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endresult=`parted -m $img unit B print free | tail -1 | cut -d ':' -f 2 | tr -d 'B\n'`
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truncate -s $endresult $img
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aftersize=`ls -lah $img | cut -d ' ' -f 5`
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echo "Shrunk $img from $beforesize to $aftersize" |