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#!/bin/sh

ifplugstatus_tool=/usr/sbin/ifplugstatus
ethtool_tool=/usr/sbin/ethtool
ip_tool=/sbin/ip
iw_tool=/usr/sbin/iw

__fstab_file=/etc/fstab

# get_hw_info <vendor> <model> <bus>
#
#   Get names from /usr/share/hwdatabase/<bus>.ids
#   or /usr/share/misc/<bus>.ids
#   Valid bus names are "pci", "usb"
#
get_hw_info(){
  local vendor="${1#0x}"
  local model="${2#0x}"
  local path=
  local info=
  [ -z "$vendor" ] || vendor="$(printf "%04x" "0x$vendor")"
  [ -z "$model" ]  || model="$(printf "%04x" "0x$model")"

  local bus="$3"

  for path in /usr/share/misc /usr/share/hwdatabase; do
      local file="$path/$bus.ids"

      [ -s "$file" ] || continue

      info="$(sed -n -e "/^$vendor/,/^[^[:space:]#]/{
        s/^$vendor[[:space:]]\+\(.*\)$/\1/p
        s/^\t$model[[:space:]]\+\(.*\)$/\1/p
        }" "$file" | tr "\n" " ")"

      [ -n "$info" ] && break
  done
  echo "$info"
}

### network devices

netdev_list()
{
    find /sys/class/net/  -mindepth 1 -maxdepth 1 -xtype d -printf '%f\n' | sort
}

netdev_is_eth()
{
    local type
    read type < "/sys/class/net/$1/type" # 2.6.18 has it already
    [ "$type" = "1" ]
}

netdev_is_virtual()
{
    if [ -d "/sys/devices/virtual/net/" ]; then
      [ -d "/sys/devices/virtual/net/$1" ] # 2.6.27
    else
      [ ! -h "/sys/class/net/$1/device" ]  # 2.6.18-24
    fi
}

netdev_is_real()
{
    ! netdev_is_virtual $@
}

netdev_is_bridge()
{
    [ -d "/sys/class/net/$1/bridge" ]
}

netdev_is_wireless()
{
    if [ -h "/sys/class/net/$1/phy80211" ] || [ -d "/sys/class/net/$1/wireless" ]; then
        return 0
    elif [ -x "$iw_tool" ]; then
        $iw_tool dev "$1" info >/dev/null 2>&1
    else
        return 1
    fi
}

netdev_is_plugged()
{
    local link= ret=1
    if [ -x "$ifplugstatus_tool" ]; then
      "$ifplugstatus_tool" "$1" >/dev/null 2>/dev/null
      [ "$?" != "2" ] || ret=0
    else
      link=`"$ethtool_tool" "$1" 2>/dev/null | awk '/Link detected:/ {print $3}'`
      [ "$link" != "yes" ] || ret=0
    fi
    return $ret
}

netdev_is_up()
{
    [ ! -x "$ip_tool" ] ||
	[ -n "$( "$ip_tool" link show up dev "$1" 2>/dev/null)" ]
}

netdev_read_mac()
{
    local f="/sys/class/net/$1/address"
    [ ! -s "$f" ] || cat "$f"
}

# Deprecated. Use read_iface_current_addr()
# from alterator-net-functions.
netdev_read_ip()
{
    echo "WARNING: netdev_read_ip is deprecated." 1>&2
    [ ! -x "$ip_tool" ] ||
	"$ip_tool" addr show dev "$1"|
	    sed -n \
		-e 's/^[[:space:]]*inet[[:space:]]\+\([0-9\./]\+\).*/\1/p'
}

netdev_read_businfo()
{
    [ ! -x "$ethtool_tool" ] || "$ethtool_tool" -i "$1" 2>/dev/null|
	sed -nr 's,^bus-info:[[:space:]]([^[:space:]]+),\1,p'
}

netdev_list_brif()
{
    ! netdev_is_bridge "$1" ||
    [ ! -d "/sys/class/net/$1/brif" ] ||
	find "/sys/class/net/$1/brif" -type l -printf '%f\n'
}

netdev_find_bridge()
{
    for i in $(netdev_list); do
	netdev_is_bridge "$i" || continue
	[ ! -h "/sys/class/net/$i/brif/$1" ] || echo "$i"
    done
}

netdev_read_info(){
  local dev="$1"
  local devdir="/sys/class/net/$dev/device"

  local bus=
  [ ! -s "$devdir/modalias" ] || bus="$(head -c3 $devdir/modalias)"

  case "$bus" in
  usb)
    local p="$(grep "PRODUCT=" "$devdir/uevent")"
    p="${p#PRODUCT=}"
    local v="${p%%/*}"
    local m="${p#*/}"
    m="${m%%/*}"
    get_hw_info "$v" "$m" usb
    ;;
  pci)
    local v m
    [ ! -s "$devdir/vendor" ] || v="$(cat "$devdir/vendor")"
    [ ! -s "$devdir/device" ] || m="$(cat "$devdir/device")"
    get_hw_info "$v" "$m" pci
    ;;
  *)
    ;;
  esac
}

### block devices

disk_list()
{
    find "/sys/block/"\
           -mindepth 1 -maxdepth 1 -xtype d  -printf '%f\n' | tr '!' '/' | sort
}

disk_is_virtual()
{
    local dev="$(echo "$1" | tr '/' '!')"
    local d="/sys/block/"

    if [ -d "/sys/devices/virtual/block/" ]; then
      [ -d "/sys/devices/virtual/block/$dev" ] # 2.6.27
    else
      [ ! -h "/sys/block/$dev/device" ]        # 2.6.18-24
    fi
}

disk_is_removable()
{
    local dev="$(echo "$1" | tr '/' '!')"
    local f="/sys/block/$dev/removable"
    [ -s "$f" ] && [ "$(cat "$f")" = "1" ]
}

disk_is_root()
{
	local rootdev="$(awk '{ if ($2=="/image") print $1 }' < /proc/mounts)"
	[ "$1" = "${rootdev#/dev/}" ]
}

disk_size()
{
    local dev="$(echo "$1" | tr '/' '!')"
    local pnum="${dev##*[a-z]}"
    local f="/sys/block/$dev/size"
    [ ! -s "$f" ] || ( read s; echo "$(($s*512))" ) < "$f"
}

disk_info(){
  local dev="$(echo "$1" | tr '/' '!')"
  local devdir="/sys/block/$dev/device"

  local ret=
  [ ! -s "$devdir/vendor" ] || ret="$(cat "$devdir/vendor")"
  [ ! -s "$devdir/model" ]  || ret="$ret $(cat "$devdir/model")"

  echo "$ret" | sed -e 's/ \+/ /g;s/\( \+$\)\|\(^ \+\)//'
}


partition_sort()
{
    # sort: sda1 < sda2 < sda10 < sdb1 < sdb2 < sdb10
    while read a; do
      local pnum="${a##*[a-z]}"
      echo -e "$a\t${a%$pnum}\t$pnum"
    done |
    sort -k 2,2 -k3,3n | cut -f 1
}

partition_list()
{
    local d="/sys/block/"

    find "$d" -mindepth 1 -maxdepth 1 -xtype d  -printf '%f\n' |
    while read dev; do
      find "$d/$dev/" \
        -mindepth 1 -maxdepth 1 -xtype d -name "$dev*" -printf '%f\n'
    done | tr '!' '/'
}

partition_size()
{
    local dev="$(echo "$1" | tr '/' '!')"
    local pnum="${dev##*[a-z]}"
    f="/sys/block/${dev%$pnum}/$dev/size"
    [ ! -s "$f" ] || ( read s; echo "$(($s*512))" ) < "$f"
}

partition_parent()
{
    local dev="$(echo "$1" | tr '/' '!')"
    local pnum="${dev##*[a-z]}"
    [ ! -d "/sys/block/${1%$pnum}/$dev" ] || echo "${1%$pnum}"
}

partition_uuid()
{
  /sbin/blkid /dev/"${1#/dev/}" -s UUID |
    sed -n -e 's/^.*UUID="\([^"]\+\)".*/\1/p'
}

partition_fstype()
{
  /sbin/blkid /dev/"${1#/dev/}" -s TYPE |
    sed -n -e 's/^.*TYPE="\([^"]\+\)".*/\1/p'
}

# superuser only
partition_id()
{
  local dev="/dev/${1#/dev/}"
  local pnum="${dev##*[^0-9]}"
  /sbin/sfdisk --print-id "${dev%$pnum}" "$pnum"
}

## human_readable_size <size>
##
## Convert bytes to human readable form:
## 1 b, 12 b, 123 b, 1.23 Kb, 12.3 Kb, 123 Kb 1.23 Mb etc.
## for localized output use
## SIZE_DEC_PT=$(LC_NUMERIC="$in_language" locale decimal_point)
## SIZE_b="`_ "b"`"
## SIZE_kb="`_ "kb"`"
## SIZE_Mb="`_ "Mb"`"
## SIZE_Gb="`_ "Gb"`"
## SIZE_Tb="`_ "Tb"`"
##

human_readable_size(){
  local size=$1
  local frac=0
  local byte="${SIZE_b:-b}"
  local units=$byte
  local div=1024
  local u
  for u in "${SIZE_kb:-kb}" "${SIZE_Mb:-Mb}" "${SIZE_Gb:-Gb}" "${SIZE_Tb:-Tb}"; do
    if [ $(($size < 1000)) = 1 ]; then break; fi
    frac=$((($size % $div)*1000/$div))  # we want frac in the range 0..999
    size=$(($size / $div))
    units=$u
  done
  if      [ "$(($size > 99))" = 1 ]; then frac=$(($frac/100))
  else if [ "$(($size > 9))" = 1 ]; then frac=$(printf "%02d" $(($frac/10)))
  fi; fi;

  # add zeroes
  frac=$(printf "%02d" $((frac/10)))

  [ "$units" = "$byte" ] && frac="" || frac="${SIZE_DEC_PT:-.}$frac"
  echo "$size$frac $units"
}

## blockdev_find_symlink <dev> <type>
##
##   Convert device name from /dev/<dev> to /dev/disk/by-<type>/* if possible.
##   Default type is "id".
##

blockdev_get_symlink(){
  local dev="${1:-}"
  [ -n "$dev" ] || return 0

  local type="${2:-id}"
  [ -n "$type" ] || return 0

  local ret=
  local i
  for i in $(/sbin/udevadm info --name="$dev" --query=symlink 2>/dev/null); do 
    [ -z "${i##disk/by-$type/*}" ] || continue

    # For type=id don't return ata* if scsi* exists
    # It is done automatically due to sorting, but let's keep explicit code here:
    [ "$type" = "id" -a -n "$ret" -a -z "${ret##*/scsi/*}" -a -z "${i##*/ata*}" ] && continue ||:

    ret="/dev/$i"
  done
  echo "${ret:-$dev}"
}

## blockdev_follow_symlink <symlink>
##
##   Revert of blockdev_find_symlink function
##   Find file symlink points to
##

blockdev_follow_symlink(){
  local dev="${1:-}"
  [ -n "$dev" ] || return 0
  local ret="$(readlink -f "$dev")"
  echo "${ret:-$dev}"
}

### fstab edition

fstab_del()
{
    local fs_file="$1";shift
    local qfs_file
    quote_sed_regexp_variable qfs_file "$fs_file"
    sed "/^[[:space:]]*[^[:space:]]\+[[:space:]]\+$qfs_file[[:space:]]/d" -i "$__fstab_file"
}

fstab_add()
{
    local fs_spec="$1";shift
    local fs_file="$1";shift
    local fs_rest="$1";shift

    local qfs_file qfs_rest qfs_spec
    quote_sed_regexp_variable qfs_spec "$fs_spec"
    quote_sed_regexp_variable qfs_file "$fs_file"
    quote_sed_regexp_variable qfs_rest "$fs_rest"

    mkdir -p -- "$mpoint"
    [ -z "$(tail -c1 "$__fstab_file")" ] || printf '\n' >>"$__fstab_file"

    local re="^[[:space:]]*[^[:space:]]\+[[:space:]]\+$qfs_file[[:space:]]"
    if grep -qs "$re" "$__fstab_file";then
	    sed \
		-e "s/${re}.*/$qfs_spec	$qfs_file	$qfs_rest/" \
		-i "$__fstab_file"
	else
	    printf '%s\t%s\t%s\n' \
		"$fs_spec" \
		"$fs_file" \
		"$fs_rest" >>"$__fstab_file"
	fi
}