Current File : //lib/dracut/modules.d/95nfs/nfs-lib.sh
#!/bin/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_nfsv6_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##*:/}"
}
# IPv6 nfs path will be treated separately
anaconda_nfsv6_to_var() {
nfs="nfs"
path="$1"
options="${path#*:/}"
path="/${options%%:*}"
server="${1#*nfs:}"
if str_starts $server '['; then
server="${server%:/*}"
options="${options#*:*}"
else
server="${server%:/*}"
options="${server%%:*}"
server="${server#*:}"
fi
}
# 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 ] && . $f
done
[ -n "$new_root_path" ] && nfsroot_to_var "$nfs:$new_root_path"
[ -z "$path" ] && [ "$(getarg root=)" = "/dev/nfs" ] && path=/tftpboot/%s
[ -z "$server" ] && server=$srv
[ -z "$server" ] && server=$new_next_server
[ -z "$server" ] && server=$new_dhcp_server_identifier
[ -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"
}
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