modules.d/95nbd/nbdroot.sh

   1 #!/bin/sh
   2
   3 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   4
   5 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   6
   7 # Huh? Empty $1?
   8 [ -z "$1" ] && exit 1
   9
  10 # Huh? Empty $2?
  11 [ -z "$2" ] && exit 1
  12
  13 # Huh? Empty $3?
  14 [ -z "$3" ] && exit 1
  15
  16 # root is in the form root=nbd:srv:port[:fstype[:rootflags[:nbdopts]]]
  17 netif="$1"
  18 nroot="$2"
  19 NEWROOT="$3"
  20
  21 # If it's not nbd we don't continue
  22 [ "${nroot%%:*}" = "nbd" ] || return
  23
  24 nroot=${nroot#nbd:}
  25 nbdserver=${nroot%%:*}; nroot=${nroot#*:}
  26 nbdport=${nroot%%:*}; nroot=${nroot#*:}
  27 nbdfstype=${nroot%%:*}; nroot=${nroot#*:}
  28 nbdflags=${nroot%%:*}
  29 nbdopts=${nroot#*:}
  30
  31 # If nbdport not an integer, then assume name based import
  32 if [ ! -z $(echo "$nbdport" | sed 's/[0-9]//g') ]; then
  33     nbdport="-N $nbdport"
  34 fi
  35
  36 if [ "$nbdopts" = "$nbdflags" ]; then
  37     unset nbdopts
  38 fi
  39 if [ "$nbdflags" = "$nbdfstype" ]; then
  40     unset nbdflags
  41 fi
  42 if [ "$nbdfstype" = "$nbdport" ]; then
  43     unset nbdfstype
  44 fi
  45 if [ -z "$nbdfstype" ]; then
  46     nbdfstype=auto
  47 fi
  48
  49 # look through the NBD options and pull out the ones that need to
  50 # go before the host etc. Append a ',' so we know we terminate the loop
  51 nbdopts=${nbdopts},
  52 while [ -n "$nbdopts" ]; do
  53     f=${nbdopts%%,*}
  54     nbdopts=${nbdopts#*,}
  55     if [ -z "$f" ]; then
  56         break
  57     fi
  58     if [ -z "${f%bs=*}" -o -z "${f%timeout=*}" ]; then
  59         preopts="$preopts $f"
  60         continue
  61     fi
  62     opts="$opts $f"
  63 done
  64
  65 # look through the flags and see if any are overridden by the command line
  66 nbdflags=${nbdflags},
  67 while [ -n "$nbdflags" ]; do
  68     f=${nbdflags%%,*}
  69     nbdflags=${nbdflags#*,}
  70     if [ -z "$f" ]; then
  71         break
  72     fi
  73     if [ "$f" = "ro" -o "$f" = "rw" ]; then
  74         nbdrw=$f
  75         continue
  76     fi
  77     fsopts=${fsopts:+$fsopts,}$f
  78 done
  79
  80 getarg ro && nbdrw=ro
  81 getarg rw && nbdrw=rw
  82 fsopts=${fsopts:+$fsopts,}${nbdrw}
  83
  84 # XXX better way to wait for the device to be made?
  85 i=0
  86 while [ ! -b /dev/nbd0 ]; do
  87     [ $i -ge 20 ] && exit 1
  88     if [ $UDEVVERSION -ge 143 ]; then
  89         udevadm settle --exit-if-exists=/dev/nbd0
  90     else
  91         sleep 0.1
  92     fi
  93     i=$(($i + 1))
  94 done
  95
  96 # If we didn't get a root= on the command line, then we need to
  97 # add the udev rules for mounting the nbd0 device
  98 if [ "$root" = "block:/dev/root" -o "$root" = "dhcp" ]; then
  99     printf 'KERNEL=="nbd0", ENV{DEVTYPE}!="partition", ENV{ID_FS_TYPE}=="?*", SYMLINK+="root"\n' >> /etc/udev/rules.d/99-nbd-root.rules
 100     udevadm control --reload
 101     type write_fs_tab >/dev/null 2>&1 || . /lib/fs-lib.sh
 102     write_fs_tab /dev/root "$nbdfstype" "$fsopts"
 103     wait_for_dev -n /dev/root
 104
 105     if [ -z "$DRACUT_SYSTEMD" ]; then
 106         printf '/bin/mount %s\n' \
 107              "$NEWROOT" \
 108              > $hookdir/mount/01-$$-nbd.sh
 109     fi
 110 fi
 111
 112 if strstr "$(nbd-client --help 2>&1)" "systemd-mark"; then
 113     preopts="--systemd-mark $preopts"
 114 fi
 115
 116 nbd-client $preopts "$nbdserver" $nbdport /dev/nbd0 $opts || exit 1
 117
 118 # NBD doesn't emit uevents when it gets connected, so kick it
 119 echo change > /sys/block/nbd0/uevent
 120 udevadm settle
 121 need_shutdown
 122 exit 0