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PiShrink
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update readme

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CuttySark1869 2023-03-05 21:55:53 +00:00
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README.md
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@ -17,6 +17,7 @@ Usage: $0 [-adhrsvzZ] imagefile.img [newimagefile.img]
-Z Compress image after shrinking with xz
-a Compress image in parallel using multiple cores
-d Write debug messages in a debug log file
-n The first input is device, not file
```
If you specify the `newimagefile.img` parameter, the script will make a copy of `imagefile.img` and work off that. You will need enough space to make a full copy of the image to use that option.
@ -28,6 +29,7 @@ If you specify the `newimagefile.img` parameter, the script will make a copy of
* `-Z` will compress the image after shrinking using xz. `.xz` extension will be added to the filename.
* `-a` will use option -f9 for pigz and option -T0 for xz and compress in parallel.
* `-d` will create a logfile `pishrink.log` which may help for problem analysis.
* `-n` will shrink the file system of a tfcard, and create an image file from that if `newimagefile.img` is specified.
Default options for compressors can be overwritten by defining PISHRINK_GZIP or PSHRINK_XZ environment variables for gzip and xz.
@ -48,10 +50,10 @@ chmod +x pishrink.sh
sudo mv pishrink.sh /usr/local/bin
```
## Example ##
## Example 1 ##
```bash
[user@localhost PiShrink]$ sudo pishrink.sh pi.img
sudo pishrink.sh pi.img
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
@ -73,6 +75,28 @@ The filesystem on /dev/loop1 is now 773603 blocks long.
Shrunk pi.img from 30G to 3.1G
```
## Example 2 ##
```bash
sudo pishrink.sh -n /dev/sdb pi.img
pishrink.sh v0.1.3
pishrink.sh: Gathering data ...
pishrink.sh: Checking filesystem ...
rootfs: 69602/155648 files (0.4% non-contiguous), 457517/599771 blocks
resize2fs 1.46.5 (30-Dec-2021)
pishrink.sh: Shrinking filesystem ...
resize2fs 1.46.5 (30-Dec-2021)
Resizing the filesystem on /dev/sdb2 to 597213 (4k) blocks.
The filesystem on /dev/sdb2 is now 597213 (4k) blocks long.
pishrink.sh: Creating image ...
5310185+0 records in
5310185+0 records out
2718814720 bytes (2.7 GB, 2.5 GiB) copied, 294.339 s, 9.2 MB/s
pishrink.sh: Shrunk pi.img from 8, to 2.6G ...
```
## Contributing ##
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.