build-package: mv termux_download to scripts/build/

build-package.sh

@@ -7,49 +7,7 @@ set -e -o pipefail -u
 source scripts/build/termux_error_exit.sh
 
 # Utility function to download a resource with an expected checksum.
-termux_download() {
+source scripts/build/termux_download.sh
-	if [ $# != 3 ]; then
-		termux_error_exit "termux_download(): Invalid arguments - expected \$URL \$DESTINATION \$CHECKSUM"
-	fi
-	local URL="$1"
-	local DESTINATION="$2"
-	local CHECKSUM="$3"
-
-	if [ -f "$DESTINATION" ] && [ "$CHECKSUM" != "SKIP_CHECKSUM" ]; then
-		# Keep existing file if checksum matches.
-		local EXISTING_CHECKSUM
-		EXISTING_CHECKSUM=$(sha256sum "$DESTINATION" | cut -f 1 -d ' ')
-		if [ "$EXISTING_CHECKSUM" = "$CHECKSUM" ]; then return; fi
-	fi
-
-	local TMPFILE
-	TMPFILE=$(mktemp "$TERMUX_PKG_TMPDIR/download.$TERMUX_PKG_NAME.XXXXXXXXX")
-	echo "Downloading ${URL}"
-	local TRYMAX=6
-	for try in $(seq 1 $TRYMAX); do
-		if curl -L --fail --retry 2 -o "$TMPFILE" "$URL"; then
-			local ACTUAL_CHECKSUM
-			ACTUAL_CHECKSUM=$(sha256sum "$TMPFILE" | cut -f 1 -d ' ')
-			if [ "$CHECKSUM" != "SKIP_CHECKSUM" ]; then
-				if [ "$CHECKSUM" != "$ACTUAL_CHECKSUM" ]; then
-					>&2 printf "Wrong checksum for %s:\nExpected: %s\nActual:   %s\n" \
-						   "$URL" "$CHECKSUM" "$ACTUAL_CHECKSUM"
-					exit 1
-				fi
-			else
-				printf "WARNING: No checksum check for %s:\nActual: %s\n" \
-				       "$URL" "$ACTUAL_CHECKSUM"
-			fi
-			mv "$TMPFILE" "$DESTINATION"
-			return
-		else
-			echo "Download of $URL failed (attempt $try/$TRYMAX)" 1>&2
-			sleep 45
-		fi
-	done
-
-	termux_error_exit "Failed to download $URL"
-}
 
 # Utility function for golang-using packages to setup a go toolchain.
 termux_setup_golang() {

scripts/build/termux_download.sh

@@ -0,0 +1,48 @@
+termux_download() {
+	if [ $# != 3 ]; then
+		termux_error_exit "termux_download(): Invalid arguments - expected \$URL \$DESTINATION \$CHECKSUM"
+	fi
+	local URL="$1"
+	local DESTINATION="$2"
+	local CHECKSUM="$3"
+
+	if [ -f "$DESTINATION" ] && [ "$CHECKSUM" != "SKIP_CHECKSUM" ]; then
+		# Keep existing file if checksum matches.
+		local EXISTING_CHECKSUM
+		EXISTING_CHECKSUM=$(sha256sum "$DESTINATION" | cut -f 1 -d ' ')
+		if [ "$EXISTING_CHECKSUM" = "$CHECKSUM" ]; then return; fi
+	fi
+
+	local TMPFILE
+	TMPFILE=$(mktemp "$TERMUX_PKG_TMPDIR/download.$TERMUX_PKG_NAME.XXXXXXXXX")
+	echo "Downloading ${URL}"
+	local TRYMAX=6
+	for try in $(seq 1 $TRYMAX); do
+		if curl -L --fail --retry 2 -o "$TMPFILE" "$URL"; then
+			local ACTUAL_CHECKSUM
+			ACTUAL_CHECKSUM=$(sha256sum "$TMPFILE" | cut -f 1 -d ' ')
+			if [ "$CHECKSUM" != "SKIP_CHECKSUM" ]; then
+				if [ "$CHECKSUM" != "$ACTUAL_CHECKSUM" ]; then
+					>&2 printf "Wrong checksum for %s:\nExpected: %s\nActual:   %s\n" \
+						   "$URL" "$CHECKSUM" "$ACTUAL_CHECKSUM"
+					exit 1
+				fi
+			else
+				printf "WARNING: No checksum check for %s:\nActual: %s\n" \
+				       "$URL" "$ACTUAL_CHECKSUM"
+			fi
+			mv "$TMPFILE" "$DESTINATION"
+			return
+		else
+			echo "Download of $URL failed (attempt $try/$TRYMAX)" 1>&2
+			sleep 45
+		fi
+	done
+
+	termux_error_exit "Failed to download $URL"
+}
+
+# Make script standalone executable as well as sourceable
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+	termux_download "$@"
+fi