Added a call to losetup -f

See https://github.com/armbian/build/issues/6568

lib/functions/cli/cli-build.sh

@@ -10,6 +10,8 @@
 function cli_standard_build_pre_run() {
 	declare -g ARMBIAN_COMMAND_REQUIRE_BASIC_DEPS="yes" # Require prepare_host_basic to run before the command.
 
+	ensure_loop_exists
+
 	# "gimme root on a Linux machine"
 	cli_standard_relaunch_docker_or_sudo
 }

lib/functions/cli/cli-docker.sh

@@ -40,6 +40,8 @@ function cli_docker_run() {
 		set_git_build_repo_url_and_commit_vars "docker launcher"
 	fi
 
+	ensure_loop_exists
+
 	LOG_SECTION="docker_cli_prepare" do_with_logging docker_cli_prepare
 
 	# @TODO: and can be very well said that in CI, we always want FAST_DOCKER=yes, unless we're building the Docker image itself.

lib/functions/host/host-utils.sh

@@ -99,7 +99,7 @@ function is_root_or_sudo_prefix() {
 	elif [[ -n "$(command -v doas)" ]]; then
 		# doas binary found in path, use it.
 		display_alert "EUID is not 0" "doas binary found, using it" "debug"
-		__my_sudo_prefix="sudo"
+		__my_sudo_prefix="doas"
 	else
 		# No root and no sudo binary. Bail out
 		exit_with_error "EUID is not 0 and no sudo binary found - Please install sudo or run as root"

lib/functions/image/loop.sh

@@ -116,3 +116,9 @@ function free_loop_device_retried() {
 	fi
 	losetup -d "${1}"
 }
+
+# Runs losetup -f as root to ensure that there is a /dev/loopX or /dev/loopXY device existing and available
+function ensure_loop_exists() {
+	local sudo_prefix="" && is_root_or_sudo_prefix sudo_prefix
+	${sudo_prefix} losetup -f
+}