Linux command
bmaptool 命令
安全
权限或系统影响较大，执行前请核对目标。
常用示例
Copy an image to a device
sudo bmaptool copy [image.img] [/dev/sdX]
Copy a compressed image
sudo bmaptool copy [image.img.xz] [/dev/sdX]
Copy with explicit bmap file
sudo bmaptool copy --bmap [image.bmap] [image.img] [/dev/sdX]
Copy without bmap
sudo bmaptool copy --nobmap [image.img] [/dev/sdX]
Create a bmap file
bmaptool create -o [image.bmap] [image.img]
Copy from a URL
sudo bmaptool copy [https://example.com/image.img.xz] [/dev/sdX]
说明
bmaptool is a utility for creating block maps (bmap) and copying images to block devices efficiently. It only writes data blocks, skipping empty or zero-filled areas, making it significantly faster than dd for sparse images. The tool provides integrity verification using SHA256 checksums and includes safety features to prevent accidental writes to mounted devices. It supports compressed images and can decompress on-the-fly during copy operations.
参数
- --bmap _file_
- Path to the bmap file (auto-detected if not specified)
- --nobmap
- Copy without using bmap (entire image is written)
- -o, --output _file_
- Output file for create command
- --no-verify
- Skip SHA256 checksum verification
- --no-sig-verify
- Skip OpenPGP signature verification
FAQ
What is the bmaptool command used for?
bmaptool is a utility for creating block maps (bmap) and copying images to block devices efficiently. It only writes data blocks, skipping empty or zero-filled areas, making it significantly faster than dd for sparse images. The tool provides integrity verification using SHA256 checksums and includes safety features to prevent accidental writes to mounted devices. It supports compressed images and can decompress on-the-fly during copy operations.
How do I run a basic bmaptool example?
Run `sudo bmaptool copy [image.img] [/dev/sdX]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does --bmap _file_ do in bmaptool?
Path to the bmap file (auto-detected if not specified)