Implement WSL hooks for Focal

The same hooks used to build Jammy and later

live-build/ubuntu-wsl/hooks/00-enable-systemd.chroot

@@ -0,0 +1,10 @@
+#!/bin/bash -eu
+# vi: ts=4 expandtab
+#
+#	Enable systemd by default on our WSL image
+#
+
+cat <<EOF >/etc/wsl.conf
+[boot]
+systemd=true
+EOF

live-build/ubuntu-wsl/hooks/01-distribution-conf.chroot

@@ -0,0 +1,20 @@
+#!/bin/bash -eu
+# vi: ts=4 expandtab
+#
+#	Create wsl-distribution.conf for WSL setup
+#
+
+source /etc/os-release
+
+cat <<EOF >/etc/wsl-distribution.conf
+[oobe]
+command = /usr/lib/wsl/wsl-setup
+defaultUid = 1000
+defaultName = ${NAME}-${VERSION_ID}
+
+[shortcut]
+icon = /usr/share/wsl/ubuntu.ico
+
+[windowsterminal]
+ProfileTemplate = /usr/share/wsl/terminal-profile.json
+EOF

live-build/ubuntu-wsl/hooks/10-create-groups.chroot

@@ -0,0 +1,10 @@
+#!/bin/bash
+#
+#	Create the necessary groups
+#
+
+echo "Adding admin group..."
+addgroup --system --quiet admin
+
+echo "Adding netdev group..."
+addgroup --system --quiet netdev

live-build/ubuntu-wsl/hooks/99-tar.binary

@@ -0,0 +1,25 @@
+#!/bin/bash -eu
+# vi: ts=4 expandtab
+#
+# Generate the compressed root directory for WSL manually.
+# Type "plain" unfortunately does not execute lb_binary_* helpers.
+
+case $ARCH in
+    amd64|arm64)
+        ;;
+    *)
+        echo "WSL root tarballs are not generated for $ARCH."
+        exit 0;;
+esac
+
+## remove attributes not supported by WSL's tar
+setfattr -x system.posix_acl_access chroot/var/log/journal
+setfattr -x system.posix_acl_default chroot/var/log/journal
+
+# Create the rootfs as a .wsl extension
+cd chroot
+tar --xattrs --sort=name -czf ../livecd.$PROJECT${SUBARCH:+-$SUBARCH}.wsl *
+cd ..
+
+# Remove initial ext4-formatted fs
+rm -f binary/boot/filesystem.ext4