Install command

[rjoleary]

The proposed install command creates a bootable drive containing u-root. For example, an invocation might look like:

install -kernel=/path/to/kernel -dev=/dev/sdb

This would:

• Create a filesystem with the necessary bootable bits on the drive.
• Write the output of the u-root build command to the drive. Extra flags are passed through.
• Copy the specified kernel to the drive.

The important key is the installed drive is sufficient to bootstrap the install command. For example, the first invocation of install runs on machine A and creates a live USB drive. The USB drive can be used to boot machine B. Finally, while booted from the USB drive, install is run a second time to install u-root from the USB drive to the hard drive of machine B.

To start, the devices I had in mind were Minnows and NUCs. Similar things which already exist are:

• Nichrome
• gokrazy

[pwFoo]

install command would be great and a additional output -format=??? to build and write direct to a disk / usb stick?
So u-root could be installed if booted as "live system" by command and installed to a disk / usb stick by -format=*
Asked for a similar feature -format=iso in #758