/usr/lib/dracut/modules.d/95nfs/nfs-lib.sh is in dracut-network 040+1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | #!/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_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 ] && . $f
done
[ -n "$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_dhcp_server_identifier
[ -z "$server" ] && server=$new_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"
}
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