95nfs: add nfs-lib.sh
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@redhat.com>master
Will Woods
Harald Hoyer
parent
9d169a07ce
commit
9c463909d6
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@ -60,6 +60,7 @@ install() {
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inst_hook pre-udev 99 "$moddir/nfs-start-rpc.sh"
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inst_hook pre-pivot 99 "$moddir/nfsroot-cleanup.sh"
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inst "$moddir/nfsroot" "/sbin/nfsroot"
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inst "$moddir/nfs-lib.sh" "/lib/nfs-lib.sh"
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mkdir -m 0755 -p "$initdir/var/lib/nfs/rpc_pipefs"
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mkdir -m 0755 -p "$initdir/var/lib/rpcbind"
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mkdir -m 0755 -p "$initdir/var/lib/nfs/statd/sm"
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@ -0,0 +1,139 @@
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#!/bin/sh
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# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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# ex: ts=8 sw=4 sts=4 et filetype=sh
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type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
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. /lib/net-lib.sh
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# TODO: make these things not pollute the calling namespace
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# nfs_to_var NFSROOT [NETIF]
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# use NFSROOT to set $nfs, $server, $path, and $options.
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# NFSROOT is something like: nfs[4]:<server>:/<path>[:<options>|,<options>]
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# NETIF is used to get information from DHCP options, if needed.
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nfs_to_var() {
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# Unfortunately, there's multiple styles of nfs "URL" in use, so we need
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# extra functions to parse them into $nfs, $server, $path, and $options.
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# FIXME: local netif=${2:-$netif}?
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case "$1" in
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nfs://*) rfc2224_nfs_to_var "$1" ;;
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nfs:*:*:/*) anaconda_nfs_to_var "$1" ;;
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*) nfsroot_to_var "$1" ;;
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esac
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# if anything's missing, try to fill it in from DHCP options
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if [ -z "$server" ] || [ -z "$path" ]; then nfsroot_from_dhcp $2; fi
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# if there's a "%s" in the path, replace it with the hostname/IP
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if strstr "$path" "%s"; then
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local node=""
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read node < /proc/sys/kernel/hostname
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[ "$node" = "(none)" ] && node=$(get_ip $2)
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path=${path%%%s*}$node${path#*%s} # replace only the first %s
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fi
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}
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# root=nfs:[<server-ip>:]<root-dir>[:<nfs-options>]
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# root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>]
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nfsroot_to_var() {
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# strip nfs[4]:
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local arg="$@:"
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nfs="${arg%%:*}"
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arg="${arg##$nfs:}"
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# check if we have a server
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if strstr "$arg" ':/*' ; then
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server="${arg%%:/*}"
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arg="/${arg##*:/}"
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fi
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path="${arg%%:*}"
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# rest are options
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options="${arg##$path}"
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# strip leading ":"
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options="${options##:}"
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# strip ":"
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options="${options%%:}"
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# Does it really start with '/'?
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[ -n "${path%%/*}" ] && path="error";
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#Fix kernel legacy style separating path and options with ','
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if [ "$path" != "${path#*,}" ] ; then
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options=${path#*,}
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path=${path%%,*}
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fi
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}
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# RFC2224: nfs://<server>[:<port>]/<path>
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rfc2224_nfs_to_var() {
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nfs="nfs"
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server="${1#nfs://}"
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path="/${server#*/}"
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server="${server%%/*}"
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server="${server%%:}" # anaconda compat (nfs://<server>:/<path>)
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local port="${server##*:}"
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[ "$port" != "$server" ] && options="port=$port"
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}
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# Anaconda-style path with options: nfs:<options>:<server>:/<path>
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# (without mount options, anaconda is the same as dracut)
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anaconda_nfs_to_var() {
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nfs="nfs"
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options="${1#nfs:}"
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server="${options#*:}"
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server="${server%:/*}"
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options="${options%%:*}"
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path="/${1##*:/}"
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}
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# nfsroot_from_dhcp NETIF
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# fill in missing server/path from DHCP options.
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nfsroot_from_dhcp() {
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local f
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for f in /tmp/net.$1.override /tmp/dhclient.$1.dhcpopts; do
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[ -f $f ] && . $f || return
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done
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[ -n "$new_root_path" ] && nfsroot_to_var "$nfs:$new_root_path"
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[ -z "$path" ] && [ "$(getarg root=)" == "/dev/nfs" ] && path=/tftpboot/%s
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[ -z "$server" ] && server=$new_dhcp_server_identifier
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[ -z "$server" ] && server=$new_dhcp_next_server
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[ -z "$server" ] && server=${new_root_path%%:*}
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}
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# Look through $options, fix "rw"/"ro", move "lock"/"nolock" to $nfslock
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munge_nfs_options() {
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local f="" flags="" nfsrw="ro" OLDIFS="$IFS"
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IFS=,
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for f in $options; do
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case $f in
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ro|rw) nfsrw=$f ;;
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lock|nolock) nfslock=$f ;;
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*) flags=${flags:+$flags,}$f ;;
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esac
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done
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IFS="$OLDIFS"
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# Override rw/ro if set on cmdline
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getarg ro >/dev/null && nfsrw=ro
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getarg rw >/dev/null && nfsrw=rw
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options=$nfsrw${flags:+,$flags}
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}
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# mount_nfs NFSROOT MNTDIR [NETIF]
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mount_nfs() {
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local nfsroot="$1" mntdir="$2" netif="$3"
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local nfs="" server="" path="" options=""
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nfs_to_var $nfsroot $netif
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munge_nfs_options
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if [ "$nfs" = "nfs4" ]; then
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options=$options${nfslock+,$nfslock}
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else
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# NFSv{2,3} doesn't support using locks as it requires a helper to
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# transfer the rpcbind state to the new root
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[ "$nfslock" = "lock" ] \
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&& warn "Locks unsupported on NFSv{2,3}, using nolock" 1>&2
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options=$options,nolock
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fi
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mount -t $nfs -o$options $server:$path $mntdir
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}
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