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update README

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Simone Karin Lehmann 2026-02-01 16:50:49 +01:00
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@ -11,44 +11,57 @@ Besides the original script it uses a few utils for the ext2/3/4 filesystem. All
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 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.
## Prerequisites ## ## Prerequisites ##
If you are trying to shrink a [NOOBS](https://github.com/raspberrypi/noobs) image it will likely fail. This is due to [NOOBS paritioning](https://github.com/raspberrypi/noobs/wiki/NOOBS-partitioning-explained) being significantly different than Raspian's. Hopefully PiShrink will be able to support NOOBS in the near future. If you are trying to shrink a [NOOBS](https://github.com/raspberrypi/noobs) image it will likely fail. This is due to [NOOBS paritioning](https://github.com/raspberrypi/noobs/wiki/NOOBS-partitioning-explained) being significantly different than Raspberry Pi OS.
## Installation ## ## Installation ##
Since you are using a RaspberryPi, I'm quite sure, that you've already installed Xcode and the Xcode command line tools. If not, please do so. Since you are using a Raspberry Pi, I'm quite sure, that you've already installed the command line tools. If not, please do so.
Then download the zip archive, uncompress it, run make and sudo make install. Here are the corresponding commands: Then clone the repo run make and sudo make install. Here are the corresponding commands:
```bash ```bash
curl -LO https://github.com/lisanet/PiShrink-macOS/archive/master.zip git clone https://github.com/lisanet/PiShrink-macOS.git
unzip master cd PiShrink-macOS
cd PiShrink-macOS-master
make make
sudo make install sudo make install
``` ```
## Example ## ## Example ##
```bash ```bash
[user@localhost PiShrink]$ pishrink pi.img >pishrink raspi.img
e2fsck 1.42.9 (28-Dec-2013) Checking filesystem on partition 2 ...
e2fsck 1.46.5 (30-Dec-2021)
Pass 1: Checking inodes, blocks, and sizes Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure Pass 2: Checking directory structure
Pass 3: Checking directory connectivity Pass 3: Checking directory connectivity
Pass 4: Checking reference counts Pass 4: Checking reference counts
Pass 5: Checking group summary information Pass 5: Checking group summary information
/dev/loop1: 88262/1929536 files (0.2% non-contiguous), 842728/7717632 blocks rootfs: 63484/1918208 files (0.3% non-contiguous), 836061/7725184 blocks
resize2fs 1.42.9 (28-Dec-2013) resize2fs 1.46.5 (30-Dec-2021)
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/loop1 to 773603 (4k) blocks. Shrinking partition 2 starting at block 532480 on raspi.img...
Begin pass 2 (max = 100387) resize2fs 1.46.5 (30-Dec-2021)
Resizing the filesystem on /dev/disk6s2 to 1054340 (4k) blocks.
Begin pass 2 (max = 403329)
Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 236) Begin pass 3 (max = 236)
Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 4 (max = 7348) Begin pass 4 (max = 7632)
Updating inode references XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Updating inode references XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/loop1 is now 773603 blocks long. The filesystem on /dev/disk6s2 is now 1054340 (4k) blocks long.
Shrunk pi.img from 30G to 3.1G "disk6" ejected.
Updating partition table to new size ...
Enter 'help' for information
fdisk: 1> Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
2: 83 128 0 1 - 143 3 16 [ 532480 - 61801472] Linux files*
Partition id ('0' to disable) [0 - FF]: [83] (? for help) Do you wish to edit in CHS mode? [n] Partition offset [0 - 62333952]: [532480] Partition size [1 - 61801472]: [61801472] fdisk:*1> Writing MBR at offset 0.
fdisk: 1>
Shrunk raspi.img from 30G to 4,3G
``` ```