[lxc-devel] [lxd/master] init: use more intelligent logic for partition sizing

[tych0 on Github]

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From 00e6eaef89029d19043c6183a650911f06450155 Mon Sep 17 00:00:00 2001
From: Tycho Andersen <tycho.andersen at canonical.com>
Date: Mon, 12 Sep 2016 10:37:51 -0600
Subject: [PATCH] init: use more intelligent logic for partition sizing

Signed-off-by: Tycho Andersen <tycho.andersen at canonical.com>
---
 lxd/main.go | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/lxd/main.go b/lxd/main.go
index 8a3e9c8..b9041f4 100644
--- a/lxd/main.go
+++ b/lxd/main.go
@@ -829,7 +829,23 @@ func cmdInit() error {
 					storageDevice = askString("Path to the existing block device: ", "", deviceExists)
 					storageMode = "device"
 				} else {
-					storageLoopSize = askInt("Size in GB of the new loop device (1GB minimum) [default=10]: ", 1, -1, "10")
+					st := syscall.Statfs_t{}
+					err := syscall.Statfs(shared.VarPath(), &st)
+					if err != nil {
+						return fmt.Errorf("couldn't statfs %s: %s", shared.VarPath(), err)
+					}
+
+					/* choose 15 GB < x < 100GB, where x is 20% of the disk size */
+					def := uint64(st.Frsize) * st.Blocks / (1024 * 1024 * 1024) / 5
+					if def > 100 {
+						def = 100
+					}
+					if def < 15 {
+						def = 15
+					}
+
+					q := fmt.Sprintf("Size in GB of the new loop device (1GB minimum) [default=%d]: ", def)
+					storageLoopSize = askInt(q, 1, -1, fmt.Sprintf("%d", def))
 					storageMode = "loop"
 				}
 			} else {