feat(units): Generic config drive and other systemd units.

Documentation/config-drive.md

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+# Distribution via Config Drive
+
+CoreOS supports providing configuration data via [config drive][config-drive]
+disk images. Currently only providing a single script or cloud config file is
+supported.
+
+[config-drive]: http://docs.openstack.org/user-guide/content/enable_config_drive.html#config_drive_contents
+
+## Contents and Format
+
+The image should be a single FAT or ISO9660 file system with the label
+`config-2` and the configuration data should be located at
+`openstack/latest/user_data`.
+
+For example, to wrap up a config named `user_data` in a config drive image:
+
+    mkdir -p /tmp/new-drive/openstack/latest
+    cp user_data /tmp/new-drive/openstack/latest/user_data
+    mkisofs -R -V config-2 -o configdrive.iso /tmp/new-drive
+    rm -r /tmp/new-drive
+
+## QEMU virtfs
+
+One exception to the above, when using QEMU it is possible to skip creating an
+image and use a plain directory containing the same contents:
+
+    qemu-system-x86_64 \
+        -fsdev local,id=conf,security_model=none,readonly,path=/tmp/new-drive \
+        -device virtio-9p-pci,fsdev=conf,mount_tag=config-2 \
+        [usual qemu options here...]

units/90-configdrive.rules

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+# Automatically trigger configdrive mounting.
+
+ACTION!="add|change", GOTO="coreos_configdrive_end"
+
+# A normal config drive. Block device formatted with iso9660 or fat
+SUBSYSTEM=="block", ENV{ID_FS_TYPE}=="iso9660|vfat", ENV{ID_FS_LABEL}=="config-2", TAG+="systemd", ENV{SYSTEMD_WANTS}+="configdrive-block.service"
+
+# Addtionally support virtfs from QEMU
+SUBSYSTEM=="virtio", DRIVER=="9pnet_virtio", ATTR{mount_tag}=="config-2", TAG+="systemd", ENV{SYSTEMD_WANTS}+="configdrive-virtfs.service"
+
+LABEL="coreos_configdrive_end"

units/configdrive-block.service

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+[Unit]
+Description=Mount config drive
+Conflicts=configdrive-virtfs.service umount.target
+ConditionPathIsMountPoint=!/media/configdrive
+# Only mount config drive block devices automatically in virtual machines
+ConditionVirtualization=vm
+
+# OpenStack defined config drive so they get to stick their name in it
+Wants=user-cloudinit@media-configdrive-openstack-latest-user_data.service
+Before=user-cloudinit@media-configdrive-openstack-latest-user_data.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=no
+ExecStart=/bin/mount -t auto -o ro,x-mount.mkdir LABEL=config-2 /media/configdrive

units/configdrive-virtfs.service

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+[Unit]
+Description=Mount config drive from virtfs
+Conflicts=configdrive-block.service umount.target
+ConditionPathIsMountPoint=!/media/configdrive
+ConditionVirtualization=vm
+
+# OpenStack defined config drive so they get to stick their name in it
+Wants=user-cloudinit@media-configdrive-openstack-latest-user_data.service
+Before=user-cloudinit@media-configdrive-openstack-latest-user_data.service
+
+# Support old style setup for now
+Wants=addon-run@media-configdrive.service addon-config@media-configdrive.service
+Before=addon-run@media-configdrive.service addon-config@media-configdrive.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=no
+ExecStart=/bin/mount -t 9p -o trans=virtio,version=9p2000.L,x-mount.mkdir config-2 /media/configdrive

units/system-cloudinit@.service

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+[Unit]
+Description=Load cloud-config from %f
+Requires=dbus.service
+After=dbus.service
+Before=system-config.target
+ConditionFileNotEmpty=%f
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/bin/coreos-cloudinit --from-file=%f

units/system-config.target

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+[Unit]
+Description=Load system-provided cloud configs
+
+# Generate /etc/environment
+Requires=coreos-setup-environment.service
+After=coreos-setup-environment.service
+
+# Load OEM cloud-config.yml
+Requires=system-cloudinit@usr-share-oem-cloud\x2dconfig.yml.service
+After=system-cloudinit@usr-share-oem-cloud\x2dconfig.yml.service

units/user-cloudinit@.service

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+[Unit]
+Description=Load cloud-config from %f
+Requires=system-config.target
+After=system-config.target
+Before=user-config.target
+ConditionFileNotEmpty=%f
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+EnvironmentFile=-/etc/environment
+ExecStart=/usr/bin/coreos-cloudinit --from-file=%f

units/user-config.target

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+[Unit]
+Description=Load user-provided cloud configs
+Requires=system-config.target
+After=system-config.target
+
+# Load user_data placed by coreos-install
+Requires=user-cloudinit@var-lib-coreos\x2dinstall-user_data.service
+After=user-cloudinit@var-lib-coreos\x2dinstall-user_data.service