added beginning of btrfs module

modules/btrfs.mod

@@ -0,0 +1,32 @@
+#!/bin/bash
+make_subvol() {
+  local usesudo
+  local uid
+  local gid
+  [[ $EUID -ne 0 ]] && usesudo=sudo
+  uid=${2:-$USER}
+  gid=${3:-$uid}
+  echo $usesudo btrfs subvolume create $1
+  $usesudo btrfs subvolume create $1
+  echo $usesudo chown $uid:$gid $1
+  $usesudo chown $uid:$gid $1
+}
+
+make_base_subvols() {
+  svols="shell admin opt data docker images temp"
+  BTRFSDATAROOT=${BTRFSDATAROOT:-/mnt/data}
+  # cd $BTRFSDATAROOT || exit
+  for svol in $svols; do
+    make_subvol $BTRFSDATAROOT/$svol $@
+  done
+}
+
+#ssudo mount -o subvol=opt /dev/sda4 /test
+
+alias btvl="sudo btrfs subvolume list"
+
+# ALL ALL = (root) NOPASSWD:/bin/btrfs
+
+#  btrfs send rootfs-nadal-$(date +"%d-%m-%Y") | btrfs receive /backup/images/snaps/rootfs
+# btrfs subvolume snapshot -r  /  /backup/rootfs-nadal-$(date +"%d-%m-%Y")
+# tar -cvpzf /backup/images/nadal-fs.tar.gz --one-file-system /