builder: lib: context.py: add mount and umount

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

builder/build/mount.py

@@ -1,7 +1,7 @@
 import os
 from logging import getLogger
 from builder.lib.context import ArchBuilderContext
-from builder.lib.mount import MountTab, MountPoint
+from builder.lib.mount import MountTab
 log = getLogger(__name__)
 
 
@@ -49,25 +49,6 @@ def undo_mounts(ctx: ArchBuilderContext):
 		raise RuntimeError("mount points not cleanup")
 
 
-def do_mount(
-	ctx: ArchBuilderContext,
-	source: str,
-	target: str,
-	fstype: str,
-	options: str
-):
-	"""
-	Add a mount point
-	"""
-	mnt = MountPoint()
-	mnt.source = source
-	mnt.target = target
-	mnt.fstype = fstype
-	mnt.options = options
-	mnt.mount()
-	ctx.mounted.insert(0, mnt)
-
-
 def init_mount(ctx: ArchBuilderContext):
 	"""
 	Setup mount points for rootfs
@@ -80,7 +61,7 @@ def init_mount(ctx: ArchBuilderContext):
 			os.symlink(target, real)
 	def root_mount(source, target, fstype, options):
 		real = os.path.realpath(os.path.join(root, target))
-		do_mount(ctx, source, real, fstype, options)
+		ctx.mount(source, real, fstype, options)
 	try:
 		# ensure mount point is clean
 		mnts = MountTab.parse_mounts()

builder/lib/context.py

@@ -7,7 +7,7 @@ from builder.lib.cpu import cpu_arch_get
 from builder.lib.utils import parse_cmd_args
 from builder.lib.subscript import dict_get
 from builder.lib.loop import loop_detach
-from builder.lib.mount import MountTab
+from builder.lib.mount import MountTab, MountPoint
 from builder.lib.cgroup import CGroup
 from builder.lib.subscript import SubScript
 from builder.lib.shadow import PasswdFile, GroupFile
@@ -189,3 +189,31 @@ class ArchBuilderContext:
 		ss = SubScript()
 		self.config = deepcopy(self.config_orig)
 		ss.parse(self.config)
+
+	def mount(
+		self,
+		source: str,
+		target: str,
+		fstype: str,
+		options: str,
+	) -> MountPoint:
+		"""
+		Add a mount point
+		"""
+		mnt = MountPoint()
+		mnt.source = source
+		mnt.target = os.path.realpath(target)
+		mnt.fstype = fstype
+		mnt.options = options
+		mnt.mount()
+		self.mounted.insert(0, mnt)
+		return mnt
+
+	def umount(self, path: str):
+		"""
+		Remove a mount point
+		"""
+		real = os.path.realpath(path)
+		if not os.path.ismount(real): return
+		for mnt in self.mounted.find_target(real):
+			self.mounted.remove(mnt)