fsck.cramfs - Linux
Overview
fsck.cramfs is a utility used to check and repair inconsistencies in a CramFS filesystem (Compressed Read-only Advanced Multi-File System). It is commonly utilized to verify the integrity of CramFS filesystems in embedded systems and other scenarios where read-only storage is preferred.
Syntax
fsck.cramfs [options] <device>
Options/Flags
| Option | Description | Default |
|—|—|—|
| -b | Checks the block device containing the CramFS | N/A |
| -f | Forces the check and repair process | N/A |
| -h | Displays help and usage information | N/A |
| -l | Lists the files and directories in the CramFS | N/A |
| -p | Prints the contents of corrupted files | N/A |
| -r | Repairs any detected inconsistencies | N/A |
| -s | Prints statistics about the CramFS | N/A |
| -v | Enables verbose output | N/A |
Examples
Basic usage (check device):
fsck.cramfs /dev/mmcblk0p1
Repair corrupted files:
fsck.cramfs -r /dev/mmcblk0p1
List files in CramFS:
fsck.cramfs -l /dev/mmcblk0p1
Common Issues
- Cannot access device: Ensure that the specified device is properly formatted as a CramFS filesystem.
- Corrupted files: If corrupted files are found, consider using the -r option to repair them.
- Filesystem errors: If filesystem errors are reported, they may need to be fixed manually using other tools or by re-flashing the device.
Integration
Using with other commands:
- mount to mount the CramFS filesystem after checking and repairing.
- losetup to loopback the CramFS file (-b option) to fsck.cramfs.
Example script:
#!/bin/bash
# Mount the USB drive
sudo mount /dev/sda1 /mnt
# Check and repair the CramFS filesystem
fsck.cramfs -r /dev/sda1
# Display the contents of the filesystem
ls -la /mnt
Related Commands
- fsck – Generic file system checker
- cramfsck – Alternative CramFS checker
- mkcramfs – Utility to create CramFS filesystems