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type getarg &gt;/dev/null 2&gt;&amp;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]:&lt;server&gt;:/&lt;path&gt;[:&lt;options&gt;|,&lt;options&gt;]
# NETIF is used to get information from DHCP options, if needed.
nfs_to_var() {
    # Unfortunately, there&#039;s multiple styles of nfs &quot;URL&quot; in use, so we need
    # extra functions to parse them into $nfs, $server, $path, and $options.
    # FIXME: local netif=${2:-$netif}?
    case &quot;$1&quot; in
        nfs://*) rfc2224_nfs_to_var &quot;$1&quot; ;;
        nfs:*[*) anaconda_nfsv6_to_var &quot;$1&quot; ;;
        nfs:*:*:/*) anaconda_nfs_to_var &quot;$1&quot; ;;
        *) nfsroot_to_var &quot;$1&quot; ;;
    esac
    # if anything&#039;s missing, try to fill it in from DHCP options
    if [ -z &quot;$server&quot; ] || [ -z &quot;$path&quot; ]; then nfsroot_from_dhcp $2; fi
    # if there&#039;s a &quot;%s&quot; in the path, replace it with the hostname/IP
    if strstr &quot;$path&quot; &quot;%s&quot;; then
        local node=&quot;&quot;
        read node &lt; /proc/sys/kernel/hostname
        [ &quot;$node&quot; = &quot;(none)&quot; ] &amp;&amp; node=$(get_ip $2)
        path=${path%%%s*}$node${path#*%s} # replace only the first %s
    fi
}

# root=nfs:[&lt;server-ip&gt;:]&lt;root-dir&gt;[:&lt;nfs-options&gt;]
# root=nfs4:[&lt;server-ip&gt;:]&lt;root-dir&gt;[:&lt;nfs-options&gt;]
nfsroot_to_var() {
    # strip nfs[4]:
    local arg=&quot;$@:&quot;
    nfs=&quot;${arg%%:*}&quot;
    arg=&quot;${arg##$nfs:}&quot;

    # check if we have a server
    if strstr &quot;$arg&quot; &#039;:/&#039; ; then
        server=&quot;${arg%%:/*}&quot;
        arg=&quot;/${arg##*:/}&quot;
    fi

    path=&quot;${arg%%:*}&quot;

    # rest are options
    options=&quot;${arg##$path}&quot;
    # strip leading &quot;:&quot;
    options=&quot;${options##:}&quot;
    # strip  &quot;:&quot;
    options=&quot;${options%%:}&quot;

    # Does it really start with &#039;/&#039;?
    [ -n &quot;${path%%/*}&quot; ] &amp;&amp; path=&quot;error&quot;;

    #Fix kernel legacy style separating path and options with &#039;,&#039;
    if [ &quot;$path&quot; != &quot;${path#*,}&quot; ] ; then
        options=${path#*,}
        path=${path%%,*}
    fi
}

# RFC2224: nfs://&lt;server&gt;[:&lt;port&gt;]/&lt;path&gt;
rfc2224_nfs_to_var() {
    nfs=&quot;nfs&quot;
    server=&quot;${1#nfs://}&quot;
    path=&quot;/${server#*/}&quot;
    server=&quot;${server%%/*}&quot;
    server=&quot;${server%%:}&quot; # anaconda compat (nfs://&lt;server&gt;:/&lt;path&gt;)
    local port=&quot;${server##*:}&quot;
    [ &quot;$port&quot; != &quot;$server&quot; ] &amp;&amp; options=&quot;port=$port&quot;
}

# Anaconda-style path with options: nfs:&lt;options&gt;:&lt;server&gt;:/&lt;path&gt;
# (without mount options, anaconda is the same as dracut)
anaconda_nfs_to_var() {
    nfs=&quot;nfs&quot;
    options=&quot;${1#nfs:}&quot;
    server=&quot;${options#*:}&quot;
    server=&quot;${server%:/*}&quot;
    options=&quot;${options%%:*}&quot;
    path=&quot;/${1##*:/}&quot;
}

# IPv6 nfs path will be treated separately
anaconda_nfsv6_to_var() {
    nfs=&quot;nfs&quot;
    path=&quot;$1&quot;
    options=&quot;${path#*:/}&quot;
    path=&quot;/${options%%:*}&quot;
    server=&quot;${1#*nfs:}&quot;
    if str_starts $server &#039;[&#039;; then
        server=&quot;${server%:/*}&quot;
        options=&quot;${options#*:*}&quot;
    else
        server=&quot;${server%:/*}&quot;
        options=&quot;${server%%:*}&quot;
        server=&quot;${server#*:}&quot;
    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 ] &amp;&amp; . $f
    done
    [ -n &quot;$new_root_path&quot; ] &amp;&amp; nfsroot_to_var &quot;$nfs:$new_root_path&quot;
    [ -z &quot;$path&quot; ] &amp;&amp; [ &quot;$(getarg root=)&quot; = &quot;/dev/nfs&quot; ] &amp;&amp; path=/tftpboot/%s
    [ -z &quot;$server&quot; ] &amp;&amp; server=$srv
    [ -z &quot;$server&quot; ] &amp;&amp; server=$new_next_server
    [ -z &quot;$server&quot; ] &amp;&amp; server=$new_dhcp_server_identifier
    [ -z &quot;$server&quot; ] &amp;&amp; server=${new_root_path%%:*}
}

# Look through $options, fix &quot;rw&quot;/&quot;ro&quot;, move &quot;lock&quot;/&quot;nolock&quot; to $nfslock
munge_nfs_options() {
    local f=&quot;&quot; flags=&quot;&quot; nfsrw=&quot;ro&quot; OLDIFS=&quot;$IFS&quot;
    IFS=,
    for f in $options; do
        case $f in
            ro|rw) nfsrw=$f ;;
            lock|nolock) nfslock=$f ;;
            *) flags=${flags:+$flags,}$f ;;
        esac
    done
    IFS=&quot;$OLDIFS&quot;

    # Override rw/ro if set on cmdline
    getarg ro &gt;/dev/null &amp;&amp; nfsrw=ro
    getarg rw &gt;/dev/null &amp;&amp; nfsrw=rw

    options=$nfsrw${flags:+,$flags}
}

# mount_nfs NFSROOT MNTDIR [NETIF]
mount_nfs() {
    local nfsroot=&quot;$1&quot; mntdir=&quot;$2&quot; netif=&quot;$3&quot;
    local nfs=&quot;&quot; server=&quot;&quot; path=&quot;&quot; options=&quot;&quot;
    nfs_to_var &quot;$nfsroot&quot; $netif
    munge_nfs_options
    if [ &quot;$nfs&quot; = &quot;nfs4&quot; ]; then
        options=$options${nfslock:+,$nfslock}
    else
        # NFSv{2,3} doesn&#039;t support using locks as it requires a helper to
        # transfer the rpcbind state to the new root
        [ &quot;$nfslock&quot; = &quot;lock&quot; ] \
            &amp;&amp; warn &quot;Locks unsupported on NFSv{2,3}, using nolock&quot; 1&gt;&amp;2
        options=$options,nolock
    fi
    mount -t $nfs -o$options &quot;$server:$path&quot; &quot;$mntdir&quot;
}
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