builder: main.py: add --clean for cleanup workspace

Signed-off-by: BigfootACA <bigfoot@classfun.cn>

README.md

@@ -30,6 +30,7 @@ python build.py -c target/ayn-odin2-sdcard,locale/zh-cn,desktop/gnome
 
 | Option                              | Description                      |
 |-------------------------------------|----------------------------------|
+| -C, --clean                         | Clean workspace before build     |
 | -p PRESET, --preset PRESET          | Select preset to create package  |
 | -c CONFIG, --config CONFIG          | Select configs to build          |
 | -o WORKSPACE, --workspace WORKSPACE | Set workspace for builder        |

builder/build/bootstrap.py

@@ -7,6 +7,7 @@ from builder.build import locale, systemd, mkinitcpio, names
 from builder.build import pacman as pacman_build
 from builder.component import pacman as pacman_comp
 from builder.lib.context import ArchBuilderContext
+from builder.lib.mount import MountTab
 log = getLogger(__name__)
 
 
@@ -51,12 +52,27 @@ def do_copy(ctx: ArchBuilderContext, src: str, dst: str):
 	if ret != 0: raise OSError("rsync failed")
 
 
+def remove_workspace(ctx: ArchBuilderContext):
+	# ensure mount point is clean
+	mnts = MountTab.parse_mounts()
+	if any(mnts.find_folder(ctx.work)):
+		raise RuntimeError("mount points not cleanup")
+
+	# DANGEROUS: fully remove workspace
+	log.info(f"cleaning workspace {ctx.work}")
+	shutil.rmtree(ctx.work)
+
+
 def build_rootfs(ctx: ArchBuilderContext):
 	"""
 	Build whole rootfs and generate image
 	"""
 	log.info("building rootfs")
 
+	# clean workspace
+	if ctx.clean and os.path.exists(ctx.work):
+		remove_workspace(ctx)
+
 	# create folders
 	os.makedirs(ctx.work, mode=0o755, exist_ok=True)
 	os.makedirs(ctx.get_rootfs(), mode=0o0755, exist_ok=True)

builder/lib/context.py

@@ -43,6 +43,11 @@ class ArchBuilderContext:
 	"""
 	repack: bool = False
 
+	"""
+	Clean workspace before rebuild
+	"""
+	clean: bool = False
+
 	"""
 	Top tree folder
 	"""

builder/main.py

@@ -15,6 +15,7 @@ def parse_arguments(ctx: ArchBuilderContext):
 		prog="arch-image-builder",
 		description="Build flashable image for Arch Linux",
 	)
+	parser.add_argument("-C", "--clean",       help="Clean workspace before build", default=False, action='store_true')
 	parser.add_argument("-p", "--preset",      help="Select preset to create package")
 	parser.add_argument("-c", "--config",      help="Select config to build", action='append')
 	parser.add_argument("-o", "--workspace",   help="Set workspace for builder", default=ctx.work)
@@ -30,6 +31,7 @@ def parse_arguments(ctx: ArchBuilderContext):
 
 	if args.no_gpgcheck: ctx.gpgcheck = False
 	if args.repack: ctx.repack = True
+	if args.clean: ctx.clean = True
 
 	# collect configs path
 	configs = []