This patch adds preliminary nbdroot support to dracut.
It does this without using udev, as module insertion creates 16 devices, each
triggering udev. For now I wanted to have nbd working, we can always implement
it in udev at a later time.
The core in question supports different root definitions:
URI Style syntax. Path is ignored, as nbd targets are defined by server and
port:
root=nbd://server.ip.add.ress:port[/path]
mkinitrd Style syntax. This is used by the mkinitrd from RH which only accepts
this syntax as a dhcp delivered root path. Dracut does understand it as a normal
root definition as well:
root=nbd:server.ip.add.ress:port:filesystemtype:mountoptions
Debian style syntax. With the base device being an optional number to indicate
the nbd device to use.
root=/dev/nbd[0-9]* nbdroot=server.ip.add.ress,port[,nbd basedevice]
diffstat dracut-nbd-root.patch
install | 4 +++
nbd-prepare.sh | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+)
diff -uNr dracut/modules.d/95nbd/install dracut/modules.d/95nbd/install
--- dracut/modules.d/95nbd/install 1970-01-01 01:00:00.000000000 +0100
+++ dracut/modules.d/95nbd/install 2009-05-23 20:11:00.438418944 +0200
@@ -0,0 +1,4 @@
+#!/bin/sh
+inst nbd-client
+inst_hook pre-mount 99 "$moddir/nbd-prepare.sh"
+instmods nbd
diff -uNr dracut/modules.d/95nbd/nbd-prepare.sh dracut/modules.d/95nbd/nbd-prepare.sh
--- dracut/modules.d/95nbd/nbd-prepare.sh 1970-01-01 01:00:00.000000000 +0100
+++ dracut/modules.d/95nbd/nbd-prepare.sh 2009-05-24 11:26:13.674261991 +0200
@@ -0,0 +1,71 @@
+#!/bin/sh
+
+# If root=dhcp and a nbd-root has been passed, transform this into the
+# root=nbd::::: syntax
+if [ "$root" = "dhcp" ]; then
+ for dev in /net.*.dhcpopts; do
+ if [ -f "$dev" ]; then
+ . "$dev"
+ [ -n "$new_root_path" ] && root="nbd:${new_root_path}"
+ fi
+ done
+fi
+
+# Transform the debian way of using root=/dev/nbd and nbdroot=,,,
+if [ -z "${root%%/dev/nbd*}"]; then
+# nbdroot=$(getarg nbdroot=)
+ if [ -n "$nbdroot" ]; then
+ nbdserver="${nbdroot%%,*}"
+ nbdport="${nbdroot#*,}"
+ nbdport="${nbdport%%,*}"
+ root="nbd://{$nbdserver}:${nbdport}/"
+ if [ "${nbdroot#*,*,}" != "$nbdroot" ]; then
+ nbdbasedev="${nbdroot#*,*,}"
+ [ -n "$nbdbasedev" ] && nbdrootdev="/dev/nbd${nbdbasedev}"
+ fi
+ fi
+fi
+
+# Only do anything if root is nbd:
+if [ "${root#nbd:}" != "$root" ]; then
+ # Parse server and port from a nbd://10.0.0.1:1234/ style URI and discard
+ # everything after the port
+ if [ "${root#nbd://}" != "$root" ]; then
+ nbdserver="${root#nbd://}"
+ nbdserver="${nbdserver%:*}"
+ nbdport="${root#nbd://$nbdserver:}"
+ nbdport="${nbdport%%/*}"
+ nbdfs=""
+ nbdopts="rw"
+
+ # Parse server, port, filesystem and options from old-style mkinitrd
+ # IPADDRESS:PORT:FILESYSTEM:OPTIONS style root definitions
+ elif [ "${root%%:*:*:*:*}" = "nbd" ]; then
+ nbdserver="${root#nbd:}"
+ nbdserver="${nbdserver%%:*}"
+ nbdport="${root#nbd:$nbdserver:}"
+ nbdport="${nbdport%%:*}"
+ nbdfs="${root#nbd:$nbdserver:$nbdport:}"
+ nbdfs="${nbdfs%%:*}"
+ nbdopts="${root#nbd:$nbdserver:$nbdport:$nbdfs:}"
+ nbdopts="${nbdopts%%:*}"
+ fi
+
+
+ if [ -n "$nbdserver" ] && [ "$nbdport" -gt 0 -a "$nbdport" -lt 65536 ]; then
+ root="${nbdrootdev:-/dev/nbd0}"
+ fstype="${nbdfs:--t auto}"
+ rflags="${nbdopts:-ro}"
+
+ modprobe nbd
+ i=0
+ # Wait till the device node really exists
+ while [ ! -b "$root" ]; do
+ [ $i -ge 20 ] && exit 1
+ sleep 0.1
+ i=$(($i+1))
+ done
+
+ nbd-client "$nbdserver" "$nbdport" "$root"
+ fi
+fi
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