utils: add postinstall.py

Replace ConfigureOs script by native calls to:

- update BCD via hivex using bcd.py and winreg.py infrastructure.
- restore efi bootloader restore_windows_efi_bootloader().

Call legacy scripts for remaining postinstall procedures to
replace them incrementally.

Define variable CONFIGUREOS_LEGACY_ENABLED as False by default.
Run legacy configureOs when CONFIGUREOS_LEGACY_ENABLED = True.
This serves as a auxiliar method to keep the restoration functional
in case of problems with the new configure_os logic.

1 files changed, 170 insertions, 0 deletions

diff --git a/src/utils/postinstall.py b/src/utils/postinstall.py
new file mode 100644
index 0000000..f6332b0
--- /dev/null
+++ b/src/utils/postinstall.py
@@ -0,0 +1,170 @@
+#
+# Copyright (C) 2022 Soleta Networks <info@soleta.eu>
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the
+# Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+
+import subprocess
+import shutil
+import logging
+import hivex
+from src.log import OgError
+from src.utils.bcd import update_bcd
+from src.utils.probe import *
+from src.utils.disk import *
+from src.utils.winreg import *
+from src.utils.fs import *
+from src.utils.uefi import *
+from socket import gethostname
+
+CONFIGUREOS_LEGACY_ENABLED = False
+
+
+def configure_os_custom(disk, partition):
+    if not shutil.which('configureOsCustom'):
+        raise OgError('configureOsCustom not found')
+
+    cmd_configure = f"configureOsCustom {disk} {partition}"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+        out = proc.stdout
+    except OSError as e:
+        raise OgError(f'Error processing configureOsCustom: {e}') from e
+
+
+def windows_register_c_drive(disk, partition):
+    cmd_configure = f"ogWindowsRegisterPartition {disk} {partition} C {disk} {partition}"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+    except OSError as e:
+        raise OgError(f'Error processing ogWindowsRegisterPartition: {e}') from e
+
+
+def configure_mbr_boot_sector(disk, partition):
+    cmd_configure = f"ogFixBootSector {disk} {partition}"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+    except OSError as e:
+        raise OgError(f'Error processing ogFixBootSector: {e}') from e
+
+
+def configure_grub_in_mbr(disk, partition):
+    cmd_configure = f"ogGrubInstallMbr {disk} {partition} TRUE"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+    except OSError as e:
+        raise OgError(f'Error processing ogGrubInstallMbr: {e}') from e
+
+
+def configure_fstab(disk, partition):
+    cmd_configure = f"ogConfigureFstab {disk} {partition}"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+    except OSError as e:
+        raise OgError(f'Error processing ogConfigureFstab: {e}') from e
+
+
+def install_grub(disk, partition):
+    cmd_configure = f"ogGrubInstallPartition {disk} {partition}"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+    except OSError as e:
+        raise OgError(f'Error processing ogGrubInstallPartition: {e}') from e
+
+
+def configure_os_linux(disk, partition):
+    configure_fstab(disk, partition)
+
+    if is_uefi_supported():
+        _, _, esp_part_number = get_efi_partition(disk, enforce_gpt=True)
+        configure_grub_in_mbr(disk, esp_part_number)
+
+    install_grub(disk, partition)
+
+
+def configure_os_windows(disk, partition):
+    if is_uefi_supported():
+        restore_windows_efi_bootloader(disk, partition)
+
+        _, _, esp_part_number = get_efi_partition(disk, enforce_gpt=True)
+        configure_grub_in_mbr(disk, esp_part_number)
+    else:
+        configure_mbr_boot_sector(disk, partition)
+
+    update_bcd(disk, partition)
+    windows_register_c_drive(disk, partition)
+
+
+def configure_os_legacy(disk, partition):
+    cmd_configure = f"configureOs {disk} {partition}"
+
+    try:
+        proc = subprocess.run(cmd_configure,
+                              stdout=subprocess.PIPE,
+                              encoding='utf-8',
+                              shell=True,
+                              check=True)
+        out = proc.stdout
+    except OSError as e:
+        raise OgError(f'Error processing configureOs: {e}') from e
+
+
+def configure_os(disk, partition):
+    if CONFIGUREOS_LEGACY_ENABLED:
+        configure_os_legacy(disk, partition)
+
+        if shutil.which('configureOsCustom'):
+            configure_os_custom(disk, partition)
+
+        return
+
+    device = get_partition_device(disk, partition)
+    mountpoint = device.replace('dev', 'mnt')
+
+    if not mount_mkdir(device, mountpoint):
+        raise OgError(f'Cannot probe OS family. Unable to mount {device} into {mountpoint}')
+
+    os_family = get_os_family(mountpoint)
+    umount(mountpoint)
+
+    extend_filesystem(disk, partition)
+
+    if os_family == OSFamily.WINDOWS:
+        configure_os_windows(disk, partition)
+    elif os_family == OSFamily.LINUX:
+        configure_os_linux(disk, partition)
+
+    if shutil.which('configureOsCustom'):
+        configure_os_custom(disk, partition)