Merge ~canonical-kernel-team/+git/overlay-shiftfs-tests:phlin/f-lxd-520 into ~canonical-kernel-team/+git/overlay-shiftfs-tests:main

[Po-Hsu Lin]

On Focal the newly released LXD 5.21 in latest/stable require ZFS 2.1
from 5.15 HWE kernel.
With that version of LXD installed the shiftfs-lxd.sh test will fail
with:
   Error: Required tool zpool is missing

LXD team suggests to use 5.21/stable, which contains ZFS 0.8 suport.

[Francis Ginther (fginther)]

+1

review: Approve

[Po-Hsu Lin (cypressyew)]

Applied and pushed, thanks.

diff --git a/install-deps b/install-deps
index 4e91bf8..5900d7e 100755
--- a/install-deps
+++ b/install-deps
@@ -4,13 +4,20 @@
 #
 
 DISTRO=$(lsb_release -sr | tr '.' ' ' | awk '{print ($1 * 100) + $2}')
+KERNEL_VERSION=$(uname -r | awk '{split($0,v,"."); printf "%s.%s\n",v[1],v[2]}')
 # Limit older releases (< F) to just ubuntu_overlayfs_smoke_test.sh test
 # Only newer release will need these packages LP: #2032779
 if [[ $DISTRO -ge 2004 ]]; then
     sudo apt-get install -y bc docker.io snapd zfsutils-linux
 
     sudo snap install lxd
-    sudo snap refresh lxd --channel=latest/stable
+    if dpkg --compare-versions "$KERNEL_VERSION" eq 5.4; then
+        # LXD 5.21.x requires ZFS 2.1, which is only avilable in 5.15+ (LP: #2061107)
+        # Let's use 5.20 for F-5.4
+        sudo snap refresh lxd --channel=5.20/stable
+    else
+        sudo snap refresh lxd --channel=latest/stable
+    fi
 else
     echo "Not installing anything for release < Focal"
 fi