diff options
Diffstat (limited to 'modules.d/slx-dmsetup/scripts/get-partitions-by-id')
| -rwxr-xr-x | modules.d/slx-dmsetup/scripts/get-partitions-by-id | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/modules.d/slx-dmsetup/scripts/get-partitions-by-id b/modules.d/slx-dmsetup/scripts/get-partitions-by-id new file mode 100755 index 00000000..2fe5ce7a --- /dev/null +++ b/modules.d/slx-dmsetup/scripts/get-partitions-by-id @@ -0,0 +1,60 @@ +#!/usr/bin/env bash +# +# Get all partitions with given ids (list of /dev/sdXX) +# Examples of supported ID types: +# * MBR's type: 44 +# * GPT's UUID: 0657fd6d-a4ab-43c4-84e5-0933c84b4f4f (swap) +# * GPT's Name: OpenSLX-ID44 +# +# First argument can be a block device to limit the search to +# partitions thereof, e.g. for /dev/loop0 to look for /dev/loop0pX +# +# NOTE: for compatibility reasons, MBR's type will also +# be matched against part name 'OpenSLX-ID<id>'. +# The output will be a list of matching devices, +# sorted from largest to smallest. +get_partitions_by_id () { + local ID dev exp target + exp= + # target for the scan, defaults to /dev to check everything + target=/dev + if [ -b "$1" ]; then + target="$1"'*' + shift + fi + # support commas and pipes to separate identifiers + local args=$@ + set -- ${args//[,|]/ } + while [ $# -gt 0 ]; do + ID=$1 + shift + [ -z "$ID" ] && continue + # if single digit, e.g. 7, look for 0x7 and 0x07 + [[ $ID =~ ^[0-9]$ ]] && ID="0?$ID" + if [[ $ID =~ ^[0-9]{2}$ ]]; then + # if double digit look for MBR types and OpenSLX-ID$ID GPT labels + exp="$exp|ID_PART_ENTRY_(NAME=OpenSLX-ID|TYPE=0x)$ID" + elif [[ $ID =~ ^(0x[0-9]{2}|[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12})$ ]]; then + # if full MBR type (e.g. 0x44) or UUID look for TYPE + exp="$exp|ID_PART_ENTRY_TYPE=$ID" + else + # something else, look for names of partitions / filesystems + exp="$exp|ID_(PART_ENTRY_NAME|FS_LABEL)=$ID" + fi + done + exp=${exp:1} + #echo "Partition find is '$exp'" >&2 + for dev in $(find $target -type b); do + udevadm info --name="$dev" | grep -iqE "($exp)\$" \ + && echo "$(blockdev --getsize64 "$dev") $dev" + done | sort -n -k1 -r | cut -d' ' -f2 +} + +## MAIN +if [ $# -eq 0 ]; then + echo "$0 needs at least one argument." + exit 1 +fi + +get_partitions_by_id $@ + |