From 14afe3ff7c385ef0d6f65fe05aa05de980fb82bb Mon Sep 17 00:00:00 2001
From: ianmdlvl <ianmdlvl>
Date: Wed, 6 Apr 2005 19:04:18 +0000
Subject: [PATCH] @@ -1,3 +1,11 @@ +chiark-utils (4.0.99.0.15) unstable;
 urgency=low + +  * /etc/chiark-backup/snap/lvm (backup/lvm in the source
 tree) now +    limits the snapshot size to 1.1x the original lv size (rounded
 down, +    ish), as lvcreate has this as an undocumented restriction. + + --
 +  chiark-utils (4.0.99.0.14) unstable; urgency=low

   * /etc/chiark-backup/snap/lvm (backup/lvm in the source tree) now uses
---
 backup/examples/chiark/settings.sh | 2 +-
 backup/lvm                         | 7 +++++++
 debian/changelog                   | 8 ++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/backup/examples/chiark/settings.sh b/backup/examples/chiark/settings.sh
index 9544a2d..e7ac2dc 100755
--- a/backup/examples/chiark/settings.sh
+++ b/backup/examples/chiark/settings.sh
@@ -1,7 +1,7 @@
 # shell script fragment setting options
 # defaults for currently implemented parameters are
 #lvm_lv=chiark_backup
-#lvm_lvsize_opts=-l <no. of free extents in vg>
+#lvm_lvsize_opts=-l <min(no. of free extents in vg, 1.1x total lv size)>
 #lvm_lvtools_opts='-A n'
 #lvm_lvcreate_opts=
 #lvm_lvcreate_args=
diff --git a/backup/lvm b/backup/lvm
index 4d897e7..5389e7b 100755
--- a/backup/lvm
+++ b/backup/lvm
@@ -67,6 +67,13 @@ if [ -z "$lvm_lvsize_opts" ]; then
 	vggroup="${vggroup%/*}"
 	vgdisplay_out="$(really vgdisplay -c "$vggroup")"
 	extents="$(printf "%s" "$vgdisplay_out" | awk -F: '{print $16}')"
+
+	lvdisplay_out="$(really lvdisplay -c "$device")"
+	extents2="$(printf "%s" "$lvdisplay_out" | awk -F: '{print $9}')"
+	extents2=$(( $extents2 + ($extents2+9)/10 - 1 ))
+
+	if [ $extents2 -lt $extents ]; then extents=$extents2; fi
+
 	lvm_lvsize_opts="-l $extents"
 fi
 
diff --git a/debian/changelog b/debian/changelog
index d837f92..af48e58 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+chiark-utils (4.0.99.0.15) unstable; urgency=low
+
+  * /etc/chiark-backup/snap/lvm (backup/lvm in the source tree) now
+    limits the snapshot size to 1.1x the original lv size (rounded down,
+    ish), as lvcreate has this as an undocumented restriction.
+
+ --
+
 chiark-utils (4.0.99.0.14) unstable; urgency=low
 
   * /etc/chiark-backup/snap/lvm (backup/lvm in the source tree) now uses
-- 
2.30.2