chroot: add chroot.mount_chroots() to mount /chroot and use in cmd_chroot()

chroot/__init__.py

@@ -50,11 +50,14 @@ def cmd_chroot(type: str = 'build', arch: str = None, enable_crossdirect=True):
                 build_chroot.initialize()
             build_chroot.initialized = True
             build_chroot.mount_pkgbuilds()
-            if config.file.build.crossdirect and enable_crossdirect:
+            build_chroot.mount_chroots()
+            assert arch and config.runtime.arch
+            if config.file.build.crossdirect and enable_crossdirect and arch != config.runtime.arch:
                 build_chroot.mount_crossdirect()
         else:
             raise Exception('Really weird bug')
 
+    chroot.mount_packages()
     chroot.activate()
     logging.debug(f'Starting shell in {chroot.name}:')
     chroot.run_cmd('bash', attach_tty=True)

chroot/abstract.py

@@ -273,6 +273,13 @@ class Chroot(AbstractChroot):
             fail_if_mounted=fail_if_mounted,
         )
 
+    def mount_chroots(self, fail_if_mounted: bool = False) -> str:
+        return self.mount(
+            absolute_source=config.get_path('chroots'),
+            relative_destination=CHROOT_PATHS['chroots'].lstrip('/'),
+            fail_if_mounted=fail_if_mounted,
+        )
+
     def write_makepkg_conf(self, target_arch: Arch, cross_chroot_relative: Optional[str], cross: bool = True) -> str:
         """
         Generate a `makepkg.conf` or `makepkg_cross_$arch.conf` file in /etc.