persistent-storage (4144B)
1 #!/bin/sh 2 3 symlink_action() { 4 case "$ACTION" in 5 add) ln -sf "$1" "$2";; 6 remove) rm -f "$2";; 7 esac 8 } 9 10 sanitise_file() { 11 sed -E -e 's/^\s+//' -e 's/\s+$//' -e 's/ /_/g' "$@" 2>/dev/null 12 } 13 14 sanitise_string() { 15 echo "$@" | sanitise_file 16 } 17 18 blkid_encode_string() { 19 # Rewrites string similar to libblk's blkid_encode_string 20 # function which is used by udev/eudev. 21 echo "$@" | sed -e 's| |\\x20|g' 22 } 23 24 : ${SYSFS:=/sys} 25 26 # cdrom symlink 27 case "$MDEV" in 28 sr*|xvd*) 29 caps="$(cat $SYSFS/block/$MDEV/capability 2>/dev/null)" 30 if [ $(( 0x${caps:-0} & 8 )) -gt 0 ] || [ "$(cat $SYSFS/block/$MDEV/removable 2>/dev/null)" = "1" ]; then 31 symlink_action $MDEV cdrom 32 fi 33 esac 34 35 36 # /dev/block symlinks 37 mkdir -p block 38 if [ -f "$SYSFS/class/block/$MDEV/dev" ]; then 39 maj_min=$(sanitise_file "$SYSFS/class/block/$MDEV/dev") 40 symlink_action ../$MDEV block/${maj_min} 41 fi 42 43 44 # by-id symlinks 45 mkdir -p disk/by-id 46 47 if [ -f "$SYSFS/class/block/$MDEV/partition" ]; then 48 # This is a partition of a device, find out its parent device 49 _parent_dev="$(basename $(${SBINDIR:-/usr/bin}/readlink -f "$SYSFS/class/block/$MDEV/.."))" 50 51 partition=$(cat $SYSFS/class/block/$MDEV/partition 2>/dev/null) 52 case "$partition" in 53 [0-9]*) partsuffix="-part$partition";; 54 esac 55 # Get name, model, serial, wwid from parent device of the partition 56 _check_dev="$_parent_dev" 57 else 58 _check_dev="$MDEV" 59 fi 60 61 model=$(sanitise_file "$SYSFS/class/block/$_check_dev/device/model") 62 name=$(sanitise_file "$SYSFS/class/block/$_check_dev/device/name") 63 serial=$(sanitise_file "$SYSFS/class/block/$_check_dev/device/serial") 64 # Special case where block devices have serials attached to the block itself, like virtio-blk 65 : ${serial:=$(sanitise_file "$SYSFS/class/block/$_check_dev/serial")} 66 wwid=$(sanitise_file "$SYSFS/class/block/$_check_dev/wwid") 67 : ${wwid:=$(sanitise_file "$SYSFS/class/block/$_check_dev/device/wwid")} 68 69 # Sets variables LABEL, PARTLABEL, PARTUUID, TYPE, UUID depending on 70 # blkid output (busybox blkid will not provide PARTLABEL or PARTUUID) 71 eval $(blkid /dev/$MDEV | cut -d: -f2-) 72 73 if [ -n "$wwid" ]; then 74 case "$MDEV" in 75 nvme*) symlink_action ../../$MDEV disk/by-id/nvme-${wwid}${partsuffix};; 76 esac 77 case "$wwid" in 78 naa.*) symlink_action ../../$MDEV disk/by-id/wwn-0x${wwid#naa.}${partsuffix};; 79 esac 80 fi 81 82 if [ -n "$serial" ]; then 83 if [ -n "$model" ]; then 84 case "$MDEV" in 85 nvme*) symlink_action ../../$MDEV disk/by-id/nvme-${model}_${serial}${partsuffix};; 86 sd*) symlink_action ../../$MDEV disk/by-id/ata-${model}_${serial}${partsuffix};; 87 esac 88 fi 89 if [ -n "$name" ]; then 90 case "$MDEV" in 91 mmcblk*) symlink_action ../../$MDEV disk/by-id/mmc-${name}_${serial}${partsuffix};; 92 esac 93 fi 94 95 # virtio-blk 96 case "$MDEV" in 97 vd*) symlink_action ../../$MDEV disk/by-id/virtio-${serial}${partsuffix};; 98 esac 99 fi 100 101 # by-label, by-partlabel, by-partuuid, by-uuid symlinks 102 if [ -n "$LABEL" ]; then 103 mkdir -p disk/by-label 104 symlink_action ../../$MDEV disk/by-label/"$(blkid_encode_string "$LABEL")" 105 fi 106 if [ -n "$PARTLABEL" ]; then 107 mkdir -p disk/by-partlabel 108 symlink_action ../../$MDEV disk/by-partlabel/"$(blkid_encode_string "$PARTLABEL")" 109 fi 110 if [ -n "$PARTUUID" ]; then 111 mkdir -p disk/by-partuuid 112 symlink_action ../../$MDEV disk/by-partuuid/"$PARTUUID" 113 fi 114 if [ -n "$UUID" ]; then 115 mkdir -p disk/by-uuid 116 symlink_action ../../$MDEV disk/by-uuid/"$UUID" 117 fi 118 119 # nvme EBS storage symlinks 120 if [ "${MDEV#nvme}" != "$MDEV" ] && [ "$model" = "Amazon_Elastic_Block_Store" ] && command -v nvme >/dev/null; then 121 n=30 122 while [ $n -gt 0 ]; do 123 ebs_alias=$(nvme id-ctrl -b /dev/$_check_dev \ 124 | dd bs=32 skip=96 count=1 2>/dev/null \ 125 | sed -nre '/^(\/dev\/)?(s|xv)d[a-z]{1,2} /p' \ 126 | tr -d ' ') 127 if [ -n "$ebs_alias" ]; then 128 symlink_action "$MDEV" ${ebs_alias#/dev/}$partition 129 break 130 fi 131 n=$((n - 1)) 132 sleep 0.1 133 done 134 fi 135 136 # backwards compatibility with /dev/usbdisk for /dev/sd* 137 if [ "${MDEV#sd}" != "$MDEV" ]; then 138 sysdev=$(readlink $SYSFS/class/block/$MDEV) 139 case "$sysdev" in 140 *usb[0-9]*) 141 # require vfat for devices without partition 142 if ! [ -e $SYSFS/block/$MDEV ] || [ TYPE="vfat" ]; then 143 symlink_action $MDEV usbdisk 144 fi 145 ;; 146 esac 147 fi 148