nfs-lib.sh contains a bunch of functions used to parse NFS "url"s of
various types, pull nfs information out of dhcp info, and actually
perform nfs mounts sanely.
Signed-off-by: Will Woods <wwoods@xxxxxxxxxx>
---
modules.d/95nfs/module-setup.sh | 1 +
modules.d/95nfs/nfs-lib.sh | 139 +++++++++++++++++++++++++++++++++++++++
2 files changed, 140 insertions(+), 0 deletions(-)
create mode 100755 modules.d/95nfs/nfs-lib.sh
diff --git a/modules.d/95nfs/module-setup.sh b/modules.d/95nfs/module-setup.sh
index 0e921ff..19d618c 100755
--- a/modules.d/95nfs/module-setup.sh
+++ b/modules.d/95nfs/module-setup.sh
@@ -60,6 +60,7 @@ install() {
inst_hook pre-udev 99 "$moddir/nfs-start-rpc.sh"
inst_hook pre-pivot 99 "$moddir/nfsroot-cleanup.sh"
inst "$moddir/nfsroot" "/sbin/nfsroot"
+ inst "$moddir/nfs-lib.sh" "/lib/nfs-lib.sh"
mkdir -m 0755 -p "$initdir/var/lib/nfs/rpc_pipefs"
mkdir -m 0755 -p "$initdir/var/lib/rpcbind"
mkdir -m 0755 -p "$initdir/var/lib/nfs/statd/sm"
diff --git a/modules.d/95nfs/nfs-lib.sh b/modules.d/95nfs/nfs-lib.sh
new file mode 100755
index 0000000..4f3d184
--- /dev/null
+++ b/modules.d/95nfs/nfs-lib.sh
@@ -0,0 +1,139 @@
+#!/bin/sh
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
+. /lib/net-lib.sh
+
+# TODO: make these things not pollute the calling namespace
+
+# nfs_to_var NFSROOT [NETIF]
+# use NFSROOT to set $nfs, $server, $path, and $options.
+# NFSROOT is something like: nfs[4]:<server>:/<path>[:<options>|,<options>]
+# NETIF is used to get information from DHCP options, if needed.
+nfs_to_var() {
+ # Unfortunately, there's multiple styles of nfs "URL" in use, so we need
+ # extra functions to parse them into $nfs, $server, $path, and $options.
+ # FIXME: local netif=${2:-$netif}?
+ case "$1" in
+ nfs://*) rfc2224_nfs_to_var "$1" ;;
+ nfs:*:*:/*) anaconda_nfs_to_var "$1" ;;
+ *) nfsroot_to_var "$1" ;;
+ esac
+ # if anything's missing, try to fill it in from DHCP options
+ if [ -z "$server" ] || [ -z "$path" ]; then nfsroot_from_dhcp $2; fi
+ # if there's a "%s" in the path, replace it with the hostname/IP
+ if strstr "$path" "%s"; then
+ local node=""
+ read node < /proc/sys/kernel/hostname
+ [ "$node" = "(none)" ] && node=$(get_ip $2)
+ path=${path%%%s*}$node${path#*%s} # replace only the first %s
+ fi
+}
+
+# root=nfs:[<server-ip>:]<root-dir>[:<nfs-options>]
+# root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>]
+nfsroot_to_var() {
+ # strip nfs[4]:
+ local arg="$@:"
+ nfs="${arg%%:*}"
+ arg="${arg##$nfs:}"
+
+ # check if we have a server
+ if strstr "$arg" ':/*' ; then
+ server="${arg%%:/*}"
+ arg="/${arg##*:/}"
+ fi
+
+ path="${arg%%:*}"
+
+ # rest are options
+ options="${arg##$path}"
+ # strip leading ":"
+ options="${options##:}"
+ # strip ":"
+ options="${options%%:}"
+
+ # Does it really start with '/'?
+ [ -n "${path%%/*}" ] && path="error";
+
+ #Fix kernel legacy style separating path and options with ','
+ if [ "$path" != "${path#*,}" ] ; then
+ options=${path#*,}
+ path=${path%%,*}
+ fi
+}
+
+# RFC2224: nfs://<server>[:<port>]/<path>
+rfc2224_nfs_to_var() {
+ nfs="nfs"
+ server="${1#nfs://}"
+ path="/${server#*/}"
+ server="${server%%/*}"
+ server="${server%%:}" # anaconda compat (nfs://<server>:/<path>)
+ local port="${server##*:}"
+ [ "$port" != "$server" ] && options="port=$port"
+}
+
+# Anaconda-style path with options: nfs:<options>:<server>:/<path>
+# (without mount options, anaconda is the same as dracut)
+anaconda_nfs_to_var() {
+ nfs="nfs"
+ options="${1#nfs:}"
+ server="${options#*:}"
+ server="${server%:/*}"
+ options="${options%%:*}"
+ path="/${1##*:/}"
+}
+
+# nfsroot_from_dhcp NETIF
+# fill in missing server/path from DHCP options.
+nfsroot_from_dhcp() {
+ local f
+ for f in /tmp/net.$1.override /tmp/dhclient.$1.dhcpopts; do
+ [ -f $f ] && . $f || return
+ done
+ [ -n "$new_root_path" ] && nfsroot_to_var "$nfs:$new_root_path"
+ [ -z "$path" ] && [ "$(getarg root=)" == "/dev/nfs" ] && path=/tftpboot/%s
+ [ -z "$server" ] && server=$new_dhcp_server_identifier
+ [ -z "$server" ] && server=$new_dhcp_next_server
+ [ -z "$server" ] && server=${new_root_path%%:*}
+}
+
+# Look through $options, fix "rw"/"ro", move "lock"/"nolock" to $nfslock
+munge_nfs_options() {
+ local f="" flags="" nfsrw="ro" OLDIFS="$IFS"
+ IFS=,
+ for f in $options; do
+ case $f in
+ ro|rw) nfsrw=$f ;;
+ lock|nolock) nfslock=$f ;;
+ *) flags=${flags:+$flags,}$f ;;
+ esac
+ done
+ IFS="$OLDIFS"
+
+ # Override rw/ro if set on cmdline
+ getarg ro >/dev/null && nfsrw=ro
+ getarg rw >/dev/null && nfsrw=rw
+
+ options=$nfsrw${flags:+,$flags}
+}
+
+# mount_nfs NFSROOT MNTDIR [NETIF]
+mount_nfs() {
+ local nfsroot="$1" mntdir="$2" netif="$3"
+ local nfs="" server="" path="" options=""
+ nfs_to_var $nfsroot $netif
+ munge_nfs_options
+ if [ "$nfs" = "nfs4" ]; then
+ options=$options${nfslock+,$nfslock}
+ else
+ # NFSv{2,3} doesn't support using locks as it requires a helper to
+ # transfer the rpcbind state to the new root
+ [ "$nfslock" = "lock" ] \
+ && warn "Locks unsupported on NFSv{2,3}, using nolock" 1>&2
+ options=$options,nolock
+ fi
+ mount -t $nfs -o$options $server:$path $mntdir
+}
--
1.7.7.6
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