utils: move all boot from OS functionality into boot.py

This change is a preparative for reimplementing the BIOS boot
in order to deprecate the legacy script. All the codepaths to
boot systems located at a partition are now called from the
boot_os_at function enabling an easier structure for the incoming
code.

1 files changed, 26 insertions, 6 deletions

diff --git a/src/utils/boot.py b/src/utils/boot.py
index 4de20b9..15dac7d 100644
--- a/src/utils/boot.py
+++ b/src/utils/boot.py
@@ -18,6 +18,17 @@ from src.utils.uefi import *
 from src.utils.fs import *
 
 
+def _boot_bios_legacy(disk, part, mountpoint):
+    raise NotImplementedError
+
+def _boot_bios_linux(disk, part, mountpoint):
+    logging.info(f'Booting Linux system')
+    _boot_bios_legacy(disk, part, mountpoint)
+
+def _boot_bios_windows(disk, part, mountpoint):
+    logging.info(f'Booting Windows system')
+    _boot_bios_legacy(disk, part, mountpoint)
+
 def _boot_uefi_windows(disk, part, mountpoint):
     logging.info(f'Booting windows system')
     bootlabel = f'Part-{disk:02d}-{part:02d}'
@@ -69,21 +80,30 @@ def _boot_uefi_linux(disk, part, mountpoint):
         umount(esp_mountpoint)
 
 def boot_os_at(disk, part):
-    if not is_uefi_supported(disk):
-        raise NotImplementedError('BIOS booting is not implemented yet')
-
+    logging.info(f'Booting disk={disk} partition={part}')
     device = get_partition_device(disk, part)
     mountpoint = device.replace('dev', 'mnt')
     if not mount_mkdir(device, mountpoint):
         raise RuntimeError(f'Cannot probe OS family. Unable to mount {device} at {esp_mountpoint}.')
 
-    logging.info(f'Booting system at {device}. Probing OS family...')
+    is_uefi = is_uefi_supported(disk)
+    if is_uefi:
+        logging.info('UEFI support detected')
+    else:
+        logging.info('UEFI support not detected')
+
     os_family = get_os_family(mountpoint)
+    logging.info(f'{os_family} detected at {device}.')
+
     try:
-        if os_family == OSFamily.WINDOWS:
+        if is_uefi and os_family == OSFamily.WINDOWS:
             _boot_uefi_windows(disk, part, mountpoint)
-        elif os_family == OSFamily.LINUX:
+        elif is_uefi and os_family == OSFamily.LINUX:
             _boot_uefi_linux(disk, part, mountpoint)
+        elif not is_uefi and os_family == OSFamily.WINDOWS:
+            _boot_bios_windows(disk, part, mountpoint)
+        elif not is_uefi and os_family == OSFamily.LINUX:
+            _boot_bios_linux(disk, part, mountpoint)
         else:
             raise RuntimeError('Unknown OS family')
     finally: