chroot: break up into subclasses

chroot/helpers.py

@@ -0,0 +1,66 @@
+import os
+
+from config import config
+from constants import Arch
+
+BIND_BUILD_DIRS = 'BINDBUILDDIRS'
+BASE_CHROOT_PREFIX = 'base_'
+BUILD_CHROOT_PREFIX = 'build_'
+
+# inspired by arch-chroot
+# order of these matters!
+BASIC_MOUNTS = {
+    '/proc': {
+        'src': 'proc',
+        'type': 'proc',
+        'options': ['nosuid,noexec,nodev']
+    },
+    '/sys': {
+        'src': 'sys',
+        'type': 'sysfs',
+        'options': ['nosuid,noexec,nodev,ro'],
+    },
+    '/dev': {
+        'src': 'udev',
+        'type': 'devtmpfs',
+        'options': ['mode=0755,nosuid'],
+    },
+    '/dev/pts': {
+        'src': 'devpts',
+        'type': 'devpts',
+        'options': ['mode=0620,gid=5,nosuid,noexec'],
+    },
+    '/dev/shm': {
+        'src': 'shm',
+        'type': 'tmpfs',
+        'options': ['mode=1777,nosuid,nodev'],
+    },
+    '/run': {
+        'src': '/run',
+        'type': 'tmpfs',
+        'options': ['bind'],
+    },
+    '/etc/resolv.conf': {
+        'src': os.path.realpath('/etc/resolv.conf'),
+        'type': None,
+        'options': ['bind'],
+    },
+}
+
+
+def make_abs_path(path: str) -> str:
+    """Simply ensures the path string starts with a '/'. Does no disk modifications!"""
+    return '/' + path.lstrip('/')
+
+
+def get_chroot_path(chroot_name, override_basepath: str = None) -> str:
+    base_path = config.get_path('chroots') if not override_basepath else override_basepath
+    return os.path.join(base_path, chroot_name)
+
+
+def base_chroot_name(arch: Arch):
+    return BASE_CHROOT_PREFIX + arch
+
+
+def build_chroot_name(arch: Arch):
+    return BUILD_CHROOT_PREFIX + arch