From f312ec055e6e374453c241a870dab04fb826ff99 Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Mon, 18 Feb 2019 12:24:51 +0100
Subject: initial collections of beta functions

---
 slx-tools | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 slx-tools

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
+}
-- 
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