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.
sudo pishrink.sh [-s] imagefile.img [newimagefile.img]
-s option is given the script will skip the autoexpanding part of the process. 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.
If you are trying to shrink a NOOBS image it will likely fail. This is due to NOOBS paritioning being significantly different than Raspian's. Hopefully PiShrink will be able to support NOOBS in the near future.
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e2fsck being out of date and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.
wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh chmod +x pishrink.sh sudo mv pishrink.sh /usr/local/bin
[user@localhost PiShrink]$ sudo pishrink.sh pi.img e2fsck 1.42.9 (28-Dec-2013) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/loop1: 88262/1929536 files (0.2% non-contiguous), 842728/7717632 blocks resize2fs 1.42.9 (28-Dec-2013) resize2fs 1.42.9 (28-Dec-2013) Resizing the filesystem on /dev/loop1 to 773603 (4k) blocks. Begin pass 2 (max = 100387) Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 236) Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 4 (max = 7348) Updating inode references XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/loop1 is now 773603 blocks long. Shrunk pi.img from 30G to 3.1G
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!