1 files changed, 111 insertions, 0 deletions
diff --git a/archinstall/lib/boot.py b/archinstall/lib/boot.py
new file mode 100644
index 00000000..62c50df3
--- /dev/null
+++ b/archinstall/lib/boot.py
@@ -0,0 +1,111 @@
+import time
+from typing import Iterator, Optional
+from .exceptions import SysCallError
+from .general import SysCommand, SysCommandWorker, locate_binary
+from .installer import Installer
+from .output import error
+from .storage import storage
+
+
+class Boot:
+	def __init__(self, installation: Installer):
+		self.instance = installation
+		self.container_name = 'archinstall'
+		self.session: Optional[SysCommandWorker] = None
+		self.ready = False
+
+	def __enter__(self) -> 'Boot':
+		if (existing_session := storage.get('active_boot', None)) and existing_session.instance != self.instance:
+			raise KeyError("Archinstall only supports booting up one instance, and a active session is already active and it is not this one.")
+
+		if existing_session:
+			self.session = existing_session.session
+			self.ready = existing_session.ready
+		else:
+			# '-P' or --console=pipe  could help us not having to do a bunch
+			# of os.write() calls, but instead use pipes (stdin, stdout and stderr) as usual.
+			self.session = SysCommandWorker([
+				'/usr/bin/systemd-nspawn',
+				'-D', str(self.instance.target),
+				'--timezone=off',
+				'-b',
+				'--no-pager',
+				'--machine', self.container_name
+			])
+
+		if not self.ready and self.session:
+			while self.session.is_alive():
+				if b' login:' in self.session:
+					self.ready = True
+					break
+
+		storage['active_boot'] = self
+		return self
+
+	def __exit__(self, *args :str, **kwargs :str) -> None:
+		# b''.join(sys_command('sync')) # No need to, since the underlying fs() object will call sync.
+		# TODO: https://stackoverflow.com/questions/28157929/how-to-safely-handle-an-exception-inside-a-context-manager
+
+		if len(args) >= 2 and args[1]:
+			error(
+				args[1],
+				f"The error above occurred in a temporary boot-up of the installation {self.instance}"
+			)
+
+		shutdown = None
+		shutdown_exit_code: Optional[int] = -1
+
+		try:
+			shutdown = SysCommand(f'systemd-run --machine={self.container_name} --pty shutdown now')
+		except SysCallError as err:
+			shutdown_exit_code = err.exit_code
+
+		if self.session:
+			while self.session.is_alive():
+				time.sleep(0.25)
+
+		if shutdown and shutdown.exit_code:
+			shutdown_exit_code = shutdown.exit_code
+
+		if self.session and (self.session.exit_code == 0 or shutdown_exit_code == 0):
+			storage['active_boot'] = None
+		else:
+			session_exit_code = self.session.exit_code if self.session else -1
+
+			raise SysCallError(
+				f"Could not shut down temporary boot of {self.instance}: {session_exit_code}/{shutdown_exit_code}",
+				exit_code=next(filter(bool, [session_exit_code, shutdown_exit_code]))
+			)
+
+	def __iter__(self) -> Iterator[bytes]:
+		if self.session:
+			for value in self.session:
+				yield value
+
+	def __contains__(self, key: bytes) -> bool:
+		if self.session is None:
+			return False
+
+		return key in self.session
+
+	def is_alive(self) -> bool:
+		if self.session is None:
+			return False
+
+		return self.session.is_alive()
+
+	def SysCommand(self, cmd: list, *args, **kwargs) -> SysCommand:
+		if cmd[0][0] != '/' and cmd[0][:2] != './':
+			# This check is also done in SysCommand & SysCommandWorker.
+			# However, that check is done for `machinectl` and not for our chroot command.
+			# So this wrapper for SysCommand will do this additionally.
+
+			cmd[0] = locate_binary(cmd[0])
+
+		return SysCommand(["systemd-run", f"--machine={self.container_name}", "--pty", *cmd], *args, **kwargs)
+
+	def SysCommandWorker(self, cmd: list, *args, **kwargs) -> SysCommandWorker:
+		if cmd[0][0] != '/' and cmd[0][:2] != './':
+			cmd[0] = locate_binary(cmd[0])
+
+		return SysCommandWorker(["systemd-run", f"--machine={self.container_name}", "--pty", *cmd], *args, **kwargs)