copy target dtb to a temp directory for qcom and sprd dt.img types (MR 57)

The dtbTool and dtbTool-sprd programs require the dtb directory as an
argument. These programs tend to combine multiple devicetrees. We can't
determine for whether the directory has devicetree blobs for a single
device, or multiple devices.

It's safer to copy the target dtb over to a temporary directory, and
pass that directory as an argument to dtbTool.

boot-deploy-functions.sh

@@ -645,8 +645,11 @@ create_bootimg() {
 	fi
 	local _dt_img=""
 	if [ "${deviceinfo_bootimg_qcdt}" = "true" ]; then
-		_dt_img="--dt /boot/dt.img"
+		# Only mkbootimg-osm0sis has support for dt.img
+		# Make sure that the program is available.
+		require_package "mkbootimg-osm0sis" "mkbootimg" "bootimg_qcdt"
 		if [ -n "${deviceinfo_bootimg_qcdt_type}" ]; then
+			_dt_img="$work_dir/dt.img"
 			if [ -z "${deviceinfo_dtb}" ]; then
 				log "ERROR: deviceinfo_bootimg_qcdt_type is set, but"
 				log "'deviceinfo_dtb' is missing. Set 'deviceinfo_dtb'"
@@ -658,36 +661,48 @@ create_bootimg() {
 				log "ERROR: Couldn't find DTB for ${deviceinfo_dtb}"
 				exit 1
 			fi
-		fi
-		case "${deviceinfo_bootimg_qcdt_type}" in
-			"exynos")
-				require_package "dtbTool-exynos" "dtbtool-exynos" "bootimg_qcdt_type"
-				dtbTool-exynos -o "/boot/dt.img" "${_dtb}";;
-			"sprd")
-				require_package "dtbTool-sprd" "dtbtool-sprd" "bootimg_qcdt_type"
-				dtbTool-sprd -o "/boot/dt.img" "${_dtb}";;
-			"qcom")
-				require_package "dtbTool" "dtbtool" "bootimg_qcdt_type"
-				dtbTool -o "/boot/dt.img" "${_dtb}";;
-			"")
-				# When 'bootimg_qcdt_type` is not set, expect that
-				# dt.img has been generated by the linux APKBUILD.
-				;;
-			*)
-				log "ERROR: deviceinfo_bootimg_qcdt_type has an unrecognized"
-				log "value. See also <https://postmarketos.org/deviceinfo>"
+			local _tmp_dtb_path="$work_dir/tmp-dtb"
+			case "${deviceinfo_bootimg_qcdt_type}" in
+				"exynos")
+					require_package "dtbTool-exynos" "dtbtool-exynos" "bootimg_qcdt_type"
+					dtbTool-exynos -o "${_dt_img}" "${_dtb}";;
+				"sprd")
+					require_package "dtbTool-sprd" "dtbtool-sprd" "bootimg_qcdt_type"
+					copy "${_dtb}" "$_tmp_dtb_path/$(basename "$_dtb")"
+					dtbTool-sprd -o "${_dt_img}" "${_tmp_dtb_path}"
+					rm -r "$_tmp_dtb_path";;
+				"qcom")
+					require_package "dtbTool" "dtbtool" "bootimg_qcdt_type"
+					copy "${_dtb}" "$_tmp_dtb_path/$(basename "$_dtb")"
+					dtbTool -o "${_dt_img}" "${_tmp_dtb_path}"
+					rm -r "$_tmp_dtb_path";;
+				"")
+					# When 'bootimg_qcdt_type` is not set, expect that
+					# dt.img has been generated by the linux APKBUILD.
+					;;
+				*)
+					log "ERROR: deviceinfo_bootimg_qcdt_type has an unrecognized"
+					log "value. See also <https://postmarketos.org/deviceinfo>"
+					exit 1
+			esac
+			additional_files="$additional_files $(basename "$_dt_img")"
+		else
+			# The kernel APKBUILD usually installs the dt.img in /boot/.
+			# Check whether the file exists or not.
+			_dt_img="/boot/dt.img"
+			if ! [ -e "$_dt_img" ]; then
+				log "ERROR: File not found: $_dt_img, but"
+				log "'deviceinfo_bootimg_qcdt' is set. Please verify that your"
+				log "device is a QCDT device by analyzing the boot.img file"
+				log "(e.g. 'pmbootstrap bootimg_analyze path/to/twrp.img')"
+				log "and based on that, set the deviceinfo variable to false or"
+				log "adjust your linux APKBUILD to properly generate the dt.img"
+				log "file. See also: <https://postmarketos.org/deviceinfo>"
 				exit 1
-		esac
-		if ! [ -e "/boot/dt.img" ]; then
-			log "ERROR: File not found: /boot/dt.img, but"
-			log "'deviceinfo_bootimg_qcdt' is set. Please verify that your"
-			log "device is a QCDT device by analyzing the boot.img file"
-			log "(e.g. 'pmbootstrap bootimg_analyze path/to/twrp.img')"
-			log "and based on that, set the deviceinfo variable to false or"
-			log "adjust your linux APKBUILD to properly generate the dt.img"
-			log "file. See also: <https://postmarketos.org/deviceinfo>"
-			exit 1
+			fi
 		fi
+		# Prepend --dt to pass it as an parameter to mkbootimg.
+		_dt_img="--dt $_dt_img"
 	fi
 
 	local _header_v2=""