Rework partitioning to drop LVM

This is part of coreos/fedora-coreos-tracker#18

For now, this just drops LVM to make it easier to use Ignition
to both build images, and help enable ignition-disks.

Note that I tried to use a separate `/var` but this currently
does not work with our Ignition, which would need to learn
how to mount `/var` in the initramfs.

We add growpart logic adapted from
projectatomic/container-storage-setup@d4994e6

(Probably at some point should teach growpart how to grow based
 on mount point paths...)

fedora-coreos-base.yaml

@@ -49,10 +49,41 @@ postprocess:
     echo '%sudo        ALL=(ALL)       NOPASSWD: ALL' > /etc/sudoers.d/coreos-sudo-group
     # We're not using resolved yet
     rm -f /usr/lib/systemd/system/systemd-resolved.service
+    # https://github.com/coreos/fedora-coreos-tracker/issues/18
+    # See also image.ks.
+    # Growpart /, until we can fix Ignition for separate /var
+    # (And eventually we want ignition-disks)
+    cat > /usr/libexec/coreos-growpart << 'EOF'
+    #!/bin/bash
+    set -euo pipefail
+    path=$1
+    shift
+    majmin=$(findmnt -nvr -o MAJ:MIN $path)
+    devpath=$(realpath /sys/dev/block/$majmin)
+    partition=$(cat $devpath/partition)
+    parent_path=$(dirname $devpath)
+    parent_device=/dev/$(basename ${parent_path})
+    # TODO: make this idempotent, and don't error out if
+    # we can't resize.
+    growpart ${parent_device} ${partition} || true
+    touch /var/lib/coreos-growpart.stamp
+    EOF
+    chmod a+x /usr/libexec/coreos-growpart
+    cat > /usr/lib/systemd/system/coreos-growpart.service <<'EOF'
+    [Unit]
+    ConditionPathExists=!/var/lib/coreos-growpart.stamp
+    [Service]
+    ExecStart=/usr/libexec/coreos-growpart /
+    RemainAfterExit=yes
+    Before=sshd.service
+    [Install]
+    WantedBy=multi-user.target
+    EOF
     cat >/usr/lib/systemd/system-preset/42-coreos.preset << EOF
     # Presets here that eventually should live in the generic fedora presets
     # This one is from https://github.com/dustymabe/ignition-dracut
     enable coreos-firstboot-complete.service
+    enable coreos-growpart.service
     EOF
     # Let's have a non-boring motd, just like CL (although theirs is more subdued
     # nowadays compared to early versions with ASCII art).  One thing we do here
@@ -79,7 +110,7 @@ packages:
  - bridge-utils nfs-utils biosdevname iptables-services
  - NetworkManager dnsmasq hostname
  # Storage
- - container-storage-setup cloud-utils-growpart
+ - cloud-utils-growpart
  - lvm2 iscsi-initiator-utils sg3_utils
  - device-mapper-multipath
  - xfsprogs e2fsprogs mdadm

image.ks

@@ -24,10 +24,10 @@ clearpart --initlabel --all
 #  - $coreos_firstboot # This is actually a GRUB variable
 bootloader --timeout=1 --append="no_timer_check console=ttyS0,115200n8 console=tty0 net.ifnames=0 biosdevname=0 ip=dhcp rd.neednet=1 rw $coreos_firstboot"
 
+# https://github.com/coreos/fedora-coreos-tracker/issues/18
+# See also coreos-growpart.service defined in fedora-coreos-base.yaml
 part /boot --size=300 --fstype="xfs" --label=boot
-part pv.01 --grow
-volgroup coreos pv.01
-logvol / --size=3000 --fstype="xfs" --name=root --vgname=coreos --label=root
+part / --size=3000 --fstype="xfs" --label=root --grow
 
 reboot
 
@@ -36,12 +36,6 @@ reboot
 # https://github.com/dustymabe/ignition-dracut/pull/12
 touch /boot/coreos-firstboot
 
-# Configure docker-storage-setup to resize the partition table on boot
-# https://github.com/projectatomic/docker-storage-setup/pull/25
-echo 'GROWPART=true' >> /etc/sysconfig/docker-storage-setup
-# https://pagure.io/atomic-wg/issue/343
-echo 'ROOT_SIZE=+100%FREE' >> /etc/sysconfig/docker-storage-setup
-
 # Remove any persistent NIC rules generated by udev
 rm -vf /etc/udev/rules.d/*persistent-net*.rules