mount seed layers when booting with RAM option

1 files changed, 13 insertions, 2 deletions

diff --git a/old-school/menu-select b/old-school/menu-select
index 55360b6..e661079 100755
--- a/old-school/menu-select
+++ b/old-school/menu-select
@@ -64,8 +64,19 @@ case "$1" in
   boot-ram)
     mkdir /cdrom /btrfs
     bootwait samizdat-cdrom
-    mount -t btrfs -o loop,subvol=ROOT /cdrom/live/filesystem.btrfs /btrfs
-    modprobe brd rd_size=$((256 * 1024 * 2)) # TODO: choose intelligently
+
+    losetup_layers || error
+    modprobe btrfs || error
+    btrfs device scan || error
+    uuid=$(choose_uuid) || error
+    [ "$uuid" ] || error
+
+    mount -t btrfs -o loop,subvol=ROOT UUID="$uuid" /btrfs
+    memtotal=$(sed -ne 's/MemTotal: *//p' /proc/meminfo)
+    ramdisk=$((1024 * ${memtotal% *} / 2))
+    [ $ramdisk -ge 256 ] || ramdisk=256
+    modprobe brd rd_size=$ramdisk
+
     btrfs device add /dev/ram0 /btrfs
     mount -o rw,remount /btrfs
     mount -o move /btrfs /root