grub-mount

grub-mount [OPTIONS] IMAGE MOUNT_POINT

IMAGE
    The path to the GRUB image file you want to mount.

MOUNT_POINT
    The directory where you want to mount the image. This directory must exist.

--offset=OFFSET
    Specifies the offset, in bytes, from the beginning of the image file where the filesystem starts.

--loop
    Use loop device for mounting image. Allows multiple mount points.

The grub-mount command provides a mechanism to mount a GRUB image, allowing you to directly access files stored within it. This is particularly useful for examining or modifying files inside images like ISO files or disk images used for GRUB. It creates a mount point and makes the contents of the image available as if it were a regular file system. It uses FUSE (Filesystem in Userspace) to accomplish this without requiring root privileges to perform the mount operation. The mounted image is read-only by default, preventing accidental modification of the underlying image. It's a handy tool for inspecting GRUB configurations, kernel images, or any other files within GRUB-managed images without needing to extract the entire image. When done accessing the files, the mount point must be explicitly unmounted using umount.

The mounted image is read-only by default. To modify files, you would typically need to copy them out, modify them, and then replace them (if supported by the image format and if you have proper permissions on the underlying filesystem). Also, remember to unmount the image using `umount` when you are finished to release the mount point.

Useful for:
1. Examining GRUB configurations without extracting the image.
2. Accessing kernel images or other files stored within GRUB-managed images.
3. Recovering files from corrupted or inaccessible systems where the GRUB image is still intact.

mount(8), umount(8), fuse(8)