The function drive() used to return a string in the following format:
"-drive file=/path/to/iso,..."
However, qemu/kvm expects "-drive" to be an argument and
"file=/path/to/iso,..." to be another argument.
The command was constructed as below since the beginning:
kvm = [
"kvm",
"-cdrom", "custom.iso", # <- OK
"-drive file=/path/to/iso,...", # <- NOK
]
Before 06ac3f92, we would join all the arguments using spaces before
executing the kvm command. Therefore we would luckily end up with a
correct command:
" ".join(kvm) -> "kvm -cdrom custom.iso -drive file=/path/to/iso,..."
However, now that we supply the command to subprocess.run directly, the
problem shows up.
Fixed by returning a tuple("-drive", "file=/path/to/iso,...") from
the drive() function.
Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>