https://github.com/meithecatte/cursedfs

Make a disk image formatted with both ext2 and FAT at once
https://github.com/meithecatte/cursedfs

Last synced: 13 days ago
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Make a disk image formatted with both ext2 and FAT at once

• Host: GitHub
• URL: https://github.com/meithecatte/cursedfs
• Owner: meithecatte
• License: wtfpl
• Created: 2020-01-14T22:53:14.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2023-05-05T17:47:07.000Z (over 1 year ago)
• Last Synced: 2024-08-01T16:35:19.954Z (3 months ago)
• Language: Shell
• Size: 1.95 KB
• Stars: 377
• Watchers: 9
• Forks: 12
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# cursedfs

Make a disk image formatted with both ext2 and FAT, at once.

```bash

~/cursedfs% wget 'https://github.com/meithecatte/cursedfs/releases/download/v1.0/cursed.img'

~/cursedfs% sudo mount -o loop -t ext2 cursed.img mountpoint/

~/cursedfs% ls mountpoint/

mkfs.cursed

~/cursedfs% sudo umount mountpoint/

~/cursedfs% sudo mount -o loop -t msdos cursed.img mountpoint/

~/cursedfs% ls mountpoint/

gudnuse.ogg

```

# Why?

[I got nerd-sniped](https://twitter.com/Foone/status/1217162186130198529?s=20)

# How?

It turns out this is surprisingly simple to do: just create a FAT volume with a

lot of reserved sectors and put the ext2 into the reserved sectors. This works

because the filesystems choose different places to put their superblock: FAT

uses the very first sector, while ext2 leaves the first kilobyte unused.

# Can I write to the filesystems?

Yes! When I first decided to do this, I thought writing to the image would

surely break everything, but as it turns out, the method I've found means

the filesystems don't conflict.