Mini Shell

#!/usr/bin/bash

# return value:
#  'nfs4': Only nfs4 founded
#  'nfs': nfs with version < 4 founded
#  '': No nfs founded
get_nfs_type() {
    local _nfs _nfs4

    for fs in "${host_fs_types[@]}"; do
        [[ $fs == "nfs" ]] && _nfs=1
        [[ $fs == "nfs3" ]] && _nfs=1
        [[ $fs == "nfs4" ]] && _nfs4=1
    done

    [[ "$_nfs" ]] && echo "nfs" && return
    [[ "$_nfs4" ]] && echo "nfs4" && return
}

# called by dracut
check() {
    # If our prerequisites are not met, fail anyways.
    require_any_binary rpcbind portmap || return 1
    require_binaries rpc.statd mount.nfs mount.nfs4 umount sed chmod chown || return 1

    [[ $hostonly ]] || [[ $mount_needs ]] && {
        [[ "$(get_nfs_type)" ]] && return 0
        return 255
    }
    return 0
}

# called by dracut
depends() {
    # We depend on network modules being loaded
    echo network
}

# called by dracut
installkernel() {
    hostonly=$(optional_hostonly) instmods '=net/sunrpc' '=fs/nfs' ipv6 nfs_acl nfs_layout_nfsv41_files
}

cmdline() {
    local nfs_device
    local nfs_options
    local nfs_root
    local nfs_address
    local lookup

    ### nfsroot= ###
    nfs_device=$(findmnt -t nfs4 -n -o SOURCE /)
    if [ -n "$nfs_device" ]; then
        nfs_root="root=nfs4:$nfs_device"
    else
        nfs_device=$(findmnt -t nfs -n -o SOURCE /)
        [ -z "$nfs_device" ] && return
        nfs_root="root=nfs:$nfs_device"
    fi
    nfs_options=$(findmnt -t nfs4,nfs -n -o OPTIONS /)
    [ -n "$nfs_options" ] && nfs_root="$nfs_root:$nfs_options"
    echo "$nfs_root"

    ### ip= ###
    if [[ $nfs_device =~ [0-9]*\.[0-9]*\.[0-9]*.[0-9]* ]] || [[ $nfs_device =~ \[[^]]*\] ]]; then
        nfs_address="${nfs_device%%:*}"
    else
        lookup=$(host "${nfs_device%%:*}" | grep " address " | head -n1)
        nfs_address=${lookup##* }
    fi

    [[ $nfs_address ]] || return
    ip_params_for_remote_addr "$nfs_address"
}

# called by dracut
install() {
    local _nsslibs
    inst_multiple -o rpc.idmapd mount.nfs mount.nfs4 umount sed /etc/netconfig chmod chown "$tmpfilesdir/rpcbind.conf"
    inst_multiple -o /etc/idmapd.conf
    inst_multiple -o /etc/services /etc/nsswitch.conf /etc/rpc /etc/protocols
    inst_multiple -o /usr/etc/services /usr/etc/nsswitch.conf /usr/etc/rpc /usr/etc/protocols

    if [[ $hostonly_cmdline == "yes" ]]; then
        local _netconf
        _netconf="$(cmdline)"
        [[ $_netconf ]] && printf "%s\n" "$_netconf" >> "${initdir}/etc/cmdline.d/95nfs.conf"
    fi

    if [[ -f $dracutsysrootdir/lib/modprobe.d/nfs.conf ]]; then
        inst_multiple /lib/modprobe.d/nfs.conf
    else
        [[ -d $initdir/etc/modprobe.d ]] || mkdir -p "$initdir"/etc/modprobe.d
        echo "alias nfs4 nfs" > "$initdir"/etc/modprobe.d/nfs.conf
    fi

    inst_libdir_file 'libnfsidmap_nsswitch.so*' 'libnfsidmap/*.so' 'libnfsidmap*.so*'

    _nsslibs=$(
        cat "$dracutsysrootdir"/{,usr/}etc/nsswitch.conf 2> /dev/null \
            | sed -e '/^#/d' -e 's/^.*://' -e 's/\[NOTFOUND=return\]//' \
            | tr -s '[:space:]' '\n' | sort -u | tr -s '[:space:]' '|'
    )
    _nsslibs=${_nsslibs#|}
    _nsslibs=${_nsslibs%|}

    inst_libdir_file -n "$_nsslibs" 'libnss_*.so*'

    inst_hook cmdline 90 "$moddir/parse-nfsroot.sh"
    inst_hook pre-udev 99 "$moddir/nfs-start-rpc.sh"
    inst_hook cleanup 99 "$moddir/nfsroot-cleanup.sh"
    inst "$moddir/nfsroot.sh" "/sbin/nfsroot"

    # For strict hostonly, only install rpcbind for NFS < 4
    if [[ $hostonly_mode != "strict" ]] || [[ "$(get_nfs_type)" != "nfs4" ]]; then
        inst_multiple -o portmap rpcbind rpc.statd
    fi

    inst "$moddir/nfs-lib.sh" "/lib/nfs-lib.sh"
    mkdir -m 0755 -p "$initdir/var/lib/nfs"
    mkdir -m 0755 -p "$initdir/var/lib/nfs/rpc_pipefs"
    mkdir -m 0770 -p "$initdir/var/lib/rpcbind"
    [ -d "$dracutsysrootdir/var/lib/nfs/statd/sm" ] \
        && mkdir -m 0700 -p "$initdir/var/lib/nfs/statd" \
        && mkdir -m 0755 -p "$initdir/var/lib/nfs/statd/sm" \
        && chown -R rpcuser:rpcuser "$initdir/var/lib/nfs/statd"
    [ -d "$dracutsysrootdir/var/lib/nfs/sm" ] \
        && mkdir -m 0755 -p "$initdir/var/lib/nfs/sm" \
        && chown -R rpcuser:rpcuser "$initdir/var/lib/nfs/sm"

    # Rather than copy the passwd file in, just set a user for rpcbind
    # We'll save the state and restart the daemon from the root anyway

    local _confdir
    for _confdir in etc usr/lib; do

        grep -sE '^(nfsnobody|_rpc|rpc|rpcuser):' "${dracutsysrootdir}/${_confdir}/passwd" \
            >> "$initdir/${_confdir}/passwd"

        grep -sE '^(nogroup|rpc|nobody):' "${dracutsysrootdir}/${_confdir}/group" \
            >> "$initdir/${_confdir}/group"
    done

    # rpc user needs to be able to write to this directory to save the warmstart
    # file
    chmod 770 "$initdir/var/lib/rpcbind"
    grep -q '^rpc:' "$dracutsysrootdir"/etc/passwd \
        && grep -q '^rpc:' "$dracutsysrootdir"/etc/group

    dracut_need_initqueue
}