confz

commit d4ccc0576cf407c6df76230d63834468a72f22d3
parent 22ef3df006ec928a55c133942c2d55d5b13edb64
Author: Jan Pobrislo <ccx@webprojekty.cz>
Date:   Tue, 21 Nov 2017 17:21:15 +0100

logical_volume_extents for creating contiguous volumes on specific devices
Diffstat:
M
zsh-functions/confz_fs_init
 | 
43
+++++++++++++++++++++++++++++++++++++++++++

1 file changed, 43 insertions(+), 0 deletions(-)
diff --git a/zsh-functions/confz_fs_init b/zsh-functions/confz_fs_init
@@ -486,6 +486,49 @@ confz_logical_volume_check() {
 	[[ -b ${vars[device]} ]]
 }
 
+# configure LVM2 logical volume
+confz_logical_volume_extents_check() {
+	[[ -n ${vars[vg_name]:=${DEFAULT_VG}} ]] || \
+		die "$0: DEFAULT_VG is unset and no 'vg_name' was passed"
+
+	checkvars lv_name pv_name extents
+
+	local vg_name lv_name pv_name pvseg_start pvseg_size segtype
+	local -A found
+	pvs --segments --noheadings --separator $'\t' \
+		-o vg_name,lv_name,pv_name,pvseg_start,pvseg_size,segtype \
+		| while IFS=$'\t' \
+		read vg_name lv_name pv_name pvseg_start pvseg_size segtype
+	do
+		vg_name=${vg_name/# #}  # strip preceding space
+		(($#found)) && die "$0: more than one segment found"
+		if matchvars vg_name $vg_name lv_name $lv_name; then
+			if [[ $segtype != linear ]] || ! matchvars pv_name $pv_name offset $pvseg_start extents $pvseg_size; then
+				die "$0: non-matching physical layout of the volume"
+			fi
+			found[offset]=$pvseg_start
+		fi
+	done
+	unify "${(kv@)found}" \
+		device /dev/mapper/$vars[vg_name]-$vars[lv_name]
+
+	do_command=(
+		lvcreate
+		--name ${vars[lv_name]}
+		--extents ${vars[extents]}
+		${vars[vg_name]}
+		$vars[pv_name]:$vars[offset]-$[ $vars[offset] + $vars[extents] ]
+	)
+
+	if ! (($#found)); then
+		fail_reason="not found in pvs output: ${vars[vg_name]}/${vars[lv_name]}"
+		return 1
+	fi
+
+	fail_reason="not a block device: ${vars[device]}"
+	[[ -b ${vars[device]} ]]
+}
+
 
 # create filesystem on block device
 confz_filesystem_check() {