Make qemu_template.sh work on MacOS
Line 14; The nproc command is only available on systems with GNU coreutils installed. The getconf _NPROCESSORS_ONLN alternative will work on a wider range of UNIX systems.
Line 114; The mktemp syntax used only works on GNU implementation.
Line 159; added hvf (MacOS) and tcg (no acceleration) options as a fallback. By doing this qemu-system-x86_64 will try to use kvm, but when it fails try hvf, and when that fails switch to the tcg accelerator.
It's been deprecated since QEMU 0.12. Fixes warning on QEMU startup:
qemu-system-x86_64: -net nic,vlan=0,model=virtio: 'vlan' is deprecated. Please use 'netdev' instead.
Setting `$VM_CDROM` in the qemu script does not work as expected when
installing Container Linux from the given bootable CDROM image. That's
probably because qemu-system-x86_64 expects another boot option `-boot
order=d` to be able to boot from the given CDROM drive. Let's specify
specify a `-boot` as well as `-drive` option for the given CDROM drive.
My primary use case for this flag is to fix booting with UEFI firmware
which can have problems when mixed with KVM, adding kexec into the mix
doesn't help matters either. The current version of OVMF can boot from
virtio drives just fine so that is now enabled and KVM is disabled.
So the -s option can also mean sloooooooow but boots!
The use of getopts was leading to conflicts between this script's short
options and qemu's long options. For example -serial was getting
interpreted as -s -- erial which is not very helpful.
If QEMU is given a uuid systemd will detect that and in turn use it for
the machine-id. This made the bug causing the machine-id to be always
re-generated on boot harder to notice since it didn't happen on QEMU.
Previously shifts were added into the getopts loop to work around
differences between different sh implementations but that causes getopts
to end the loop early. Instead use an intermediate variable to work
around inconsistent OPTIND behavior and explicitly check for the --
separator. Tested in bash, dash, and ash.
This one is more automagical and sets up ssh keys from ssh-agent and the
user's home directory by default. Also adds an option for setting the
ssh port so it can be something other than 2222. Script should be
sufficiently portable, tested in bash, dash, and ash.
