RFC netroot: modular support for network root devices

This builds on the NFS root work to allow other network methods to hook into the parsing and network infrastructure. One network interface is configured at a time, but if we don't find a root there, it may not be unconfigured -- this should probably be added.

I implemented some of the legacy formats we talked about, but not all of them, and I may not have them 100% correct. That handling has seen less testing than the NFS methods I usually use. I have verified that this set will work with root=dhcp w/ NFS, and no root, but nbdroot= for NBD.

I think we can offer some support for LVM/LUKS over NBD, but that's low on my list at the moment -- it was more important to shine some light on this to see if it gets burned up. Documentation would be another high priority, as in the formats supported as well as the interfaces and expectations of the handlers.

David Dillow (9):
nfsroot: move to same sort order as block methods block root: split out resume parsing and udev rules
dracut: add cmdline hook
cmdline: cleanup handling and block: handler
resume: add support for labeled resume devices
dracut-lib: add source_all to library
netroot: add common handler for network root devices
nfsroot: move to netroot framework
Add NBD support

 dracut                                            |    2 +-
 modules.d/40network/60-net.rules                  |    1 +
 modules.d/40network/dhcp-fallback.sh              |   14 +++
 modules.d/40network/ifup                          |    8 +-
 modules.d/40network/install                       |    2 +
 modules.d/40network/netroot                       |   52 +++++++++
 modules.d/40nfsroot/60-nfsroot.rules              |    1 -
 modules.d/40nfsroot/nfsroot                       |  125 ---------------------
 modules.d/{40nfsroot => 95nbd}/check              |    4 +-
 modules.d/95nbd/install                           |    7 +
 modules.d/95nbd/nbd-netroot.sh                    |   11 ++
 modules.d/95nbd/nbdroot                           |   96 ++++++++++++++++
 modules.d/95nbd/parse-nbdroot.sh                  |   49 ++++++++
 modules.d/{40nfsroot => 95nfs}/check              |    0
 modules.d/{40nfsroot => 95nfs}/install            |   10 +--
 modules.d/95nfs/nfs-netroot.sh                    |   52 +++++++++
 modules.d/95nfs/nfsroot                           |   82 ++++++++++++++
 modules.d/{40nfsroot => 95nfs}/nfsroot-cleanup.sh |    0
 modules.d/95nfs/parse-nfsroot.sh                  |   48 ++++++++
 modules.d/95resume/install                        |    4 +-
 modules.d/95resume/parse-resume.sh                |    8 ++
 modules.d/95resume/resume-genrules.sh             |    8 ++
 modules.d/95rootfs-block/block-genrules.sh        |   10 ++
 modules.d/95rootfs-block/genrules.sh              |   14 ---
 modules.d/95rootfs-block/install                  |    6 +-
 modules.d/95rootfs-block/parse-block.sh           |   16 +++
 modules.d/95rootfs-block/parse-root-opts.sh       |   21 +---
 modules.d/99base/dracut-lib                       |   22 ++++
 modules.d/99base/init                             |   31 ++++-
 29 files changed, 522 insertions(+), 182 deletions(-)
 create mode 100755 modules.d/40network/dhcp-fallback.sh
 create mode 100755 modules.d/40network/netroot
 delete mode 100644 modules.d/40nfsroot/60-nfsroot.rules
 delete mode 100755 modules.d/40nfsroot/nfsroot
 copy modules.d/{40nfsroot => 95nbd}/check (61%)
 create mode 100755 modules.d/95nbd/install
 create mode 100755 modules.d/95nbd/nbd-netroot.sh
 create mode 100755 modules.d/95nbd/nbdroot
 create mode 100755 modules.d/95nbd/parse-nbdroot.sh
 rename modules.d/{40nfsroot => 95nfs}/check (100%)
 rename modules.d/{40nfsroot => 95nfs}/install (83%)
 create mode 100755 modules.d/95nfs/nfs-netroot.sh
 create mode 100755 modules.d/95nfs/nfsroot
 rename modules.d/{40nfsroot => 95nfs}/nfsroot-cleanup.sh (100%)
 create mode 100755 modules.d/95nfs/parse-nfsroot.sh
 create mode 100755 modules.d/95resume/resume-genrules.sh
 create mode 100755 modules.d/95rootfs-block/block-genrules.sh
 delete mode 100755 modules.d/95rootfs-block/genrules.sh
 create mode 100755 modules.d/95rootfs-block/parse-block.sh

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