Live_usb

This component can be included in a build to support writing a sparse FVM to a a ramdisk during boot, which results in a temporary FVM which is lost once the system is rebooted.

This enables trying Fuchsia without worrying about paving a device or sacrificing a computer to try it on.

Using it

Set up a Fuchsia development environment.
Run the following in a shell:

$ echo 'boot.usb=true bootloader.default=local devmgr.bind-eager=usb_composite' > cmdline
$ fx set workstation_eng.x64 && fx build

Insert a USB device. We will call it /dev/sdX - replace X with the appropriate drive letter.
Run the following:

$ fx make-fuchsia-vol --use-sparse-fvm --cmdline cmdline /dev/sdX

Insert the USB drive into a Fuchsia-compatible computer, boot from it, and wait a minute or two.