build(legacy): make bootloader_align target repeatable

[no changelog]

legacy/bootloader/Makefile

@@ -1,4 +1,4 @@
-NAME  = bootloader
+NAME  = bootloader-unaligned
 
 OBJS += bootloader.o
 OBJS += signatures.o
@@ -44,5 +44,7 @@ include ../Makefile.include
 # Remove libtrezor from linking since we specified the small versions
 LDLIBS := $(filter-out -ltrezor,$(LDLIBS))
 
-align: $(NAME).bin
-	./firmware_align.py $(NAME).bin
+bootloader.bin: $(NAME).bin
+	./firmware_align.py $< $@
+
+all: bootloader.bin

legacy/bootloader/firmware_align.py

@@ -5,12 +5,14 @@ import sys
 TOTALSIZE = 32768
 MAXSIZE = TOTALSIZE - 32
 
-fn = sys.argv[1]
-fs = os.stat(fn).st_size
+infile = sys.argv[1]
+outfile = sys.argv[2]
+fs = os.stat(infile).st_size
 if fs > MAXSIZE:
     raise Exception(
         f"bootloader has to be smaller than {MAXSIZE} bytes (current size is {fs})"
     )
-with open(fn, "ab") as f:
+with open(outfile, "wb") as f:
+    with open(infile, "rb") as i:
+        f.write(i.read())
     f.write(b"\x00" * (TOTALSIZE - fs))
-    f.close()

legacy/script/cibuild

@@ -16,7 +16,7 @@ fi
 make
 
 if [ "$EMULATOR" != 1 ]; then
-    make -C bootloader align
+    make -C bootloader
 fi
 
 # invoking nanopb_generator to make sure its proto files are generated