[arch-releng] [RFC] [archiso] Support for persistence on dm-snapshot devices

For details see the second patch. First patch is to avoid code duplication. This is based from my experimental branch (wating for ACK to merge in master). Just building the baseline profile is sufficient to test it. qemu-img create -f qcow2 /tmp/persi.qcow2 1G qemu -cdrom archlinux-2011.08.23-i686.iso -hda /tmp/persi.qcow2 -boot d Create one partiton, make an ext2/3/4 filesystem, set a label, reboot, add to kernel cmdline cow_label=MY_LABEL, and enjoy. https://github.com/djgera/archiso/tree/cow_persistent