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| -rw-r--r-- | slx-tools | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/slx-tools b/slx-tools new file mode 100644 index 0000000..cce30a2 --- /dev/null +++ b/slx-tools @@ -0,0 +1,77 @@ +#!/bin/bash + +# Collection of small bash functions utilized in various scripts. +################################################################################ +export PATH=$PATH:/opt/openslx/bin:/opt/openslx/sbin + +declare -rg dmstate="/run/openslx/dmsetup.state" + +get_backing_part() { + local _dev _mp + read -r _dev _mp _rest <<< \ + "$(df -P "$1" 2>&1 | awk '$1 ~ /^\/dev\// {print $1" "$6}')" + [ -b "$_dev" ] || return 1 + echo $_dev +} +# Helper to check whether given directory resides in RAM, either +# by being mounted as tmpfs or not mounted at all in which case +# we assume the same. Returns 0 if so, 1 if otherwise backed, +# 2 when errors occur. +is_volatile() { + [ -z "$1" ] && return 2 + local _dev="$(get_backing_part $1)" + [ "$_dev" = "${_dev//\/dev\/mapper/}" ] && return 1 + # it is a device mapper device, check if it was setup in dracut's initramfs. + if [ -s "$dmstate" ]; then + grep -qE "^${_dev}\s+${_mp}\s+type=0" "$dmstate" + return $? + fi + return 2 +} + +get_dm_backing_size() { + [ -z "$1" ] && return 1 + local _dev="$(get_backing_part $1)" + [ "$_dev" = "${_dev//\/dev\/mapper/}" ] && return 1 + local _dm_line="$(grep -m1 -E "^${_dev}\s+/\s+type=[^0]" "$dmstate")" + [ -z "$_dm_line" ] && return 1 + local _dm_dev_size="$(grep -Po '(?<=physical_size=|virtual_size=)\w*' <<< "$_dm_line" )" + echo ${_dm_dev_size:--1} +} + +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 +} |