Merge branch 'current' into equuleus

1 files changed, 148 insertions, 0 deletions

diff --git a/src/op_mode/format_disk.py b/src/op_mode/format_disk.py
new file mode 100755
index 000000000..5a3b250ee
--- /dev/null
+++ b/src/op_mode/format_disk.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import os
+import re
+import subprocess
+import sys
+from datetime import datetime
+from time import sleep
+
+from vyos.util import is_admin, ask_yes_no
+
+
+def list_disks():
+    disks = set()
+    with open('/proc/partitions') as partitions_file:
+        for line in partitions_file:
+            fields = line.strip().split()
+            if len(fields) == 4 and fields[3].isalpha() and fields[3] != 'name':
+                disks.add(fields[3])
+    return disks
+
+
+def is_busy(disk: str):
+    """Check if given disk device is busy by re-reading it's partition table"""
+
+    cmd = 'sudo blockdev --rereadpt /dev/{}'.format(disk)
+    status = subprocess.call([cmd], shell=True, stderr=subprocess.DEVNULL)
+    return status != 0
+
+
+def backup_partitions(disk: str):
+    """Save sfdisk partitions output to a backup file"""
+
+    device_path = '/dev/' + disk
+    backup_ts = datetime.now().strftime('%Y-%m-%d-%H:%M')
+    backup_file = '/var/tmp/backup_{}.{}'.format(disk, backup_ts)
+    cmd = 'sudo /sbin/sfdisk -d {} > {}'.format(device_path, backup_file)
+    subprocess.check_call([cmd], shell=True)
+
+
+def list_partitions(disk: str):
+    """List partition numbers of a given disk"""
+
+    parts = set()
+    part_num_expr = re.compile(disk + '([0-9]+)')
+    with open('/proc/partitions') as partitions_file:
+        for line in partitions_file:
+            fields = line.strip().split()
+            if len(fields) == 4 and fields[3] != 'name' and part_num_expr.match(fields[3]):
+                part_idx = part_num_expr.match(fields[3]).group(1)
+                parts.add(int(part_idx))
+    return parts
+
+
+def delete_partition(disk: str, partition_idx: int):
+    cmd = 'sudo /sbin/parted /dev/{} rm {}'.format(disk, partition_idx)
+    subprocess.check_call([cmd], shell=True)
+
+
+def format_disk_like(target: str, proto: str):
+    cmd = 'sudo /sbin/sfdisk -d /dev/{} | sudo /sbin/sfdisk --force /dev/{}'.format(proto, target)
+    subprocess.check_call([cmd], shell=True)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    group = parser.add_argument_group()
+    group.add_argument('-t', '--target', type=str, required=True, help='Target device to format')
+    group.add_argument('-p', '--proto', type=str, required=True, help='Prototype device to use as reference')
+    args = parser.parse_args()
+
+    if not is_admin():
+        print('Must be admin or root to format disk')
+        sys.exit(1)
+
+    target_disk = args.target
+    eligible_target_disks = list_disks()
+
+    proto_disk = args.proto
+    eligible_proto_disks = eligible_target_disks.copy()
+    eligible_proto_disks.remove(target_disk)
+
+    fmt = {
+        'target_disk': target_disk,
+        'proto_disk': proto_disk,
+    }
+
+    if proto_disk == target_disk:
+        print('The two disk drives must be different.')
+        sys.exit(1)
+
+    if not os.path.exists('/dev/' + proto_disk):
+        print('Device /dev/{proto_disk} does not exist'.format_map(fmt))
+        sys.exit(1)
+
+    if not os.path.exists('/dev/' + target_disk):
+        print('Device /dev/{target_disk} does not exist'.format_map(fmt))
+        sys.exit(1)
+
+    if target_disk not in eligible_target_disks:
+        print('Device {target_disk} can not be formatted'.format_map(fmt))
+        sys.exit(1)
+
+    if proto_disk not in eligible_proto_disks:
+        print('Device {proto_disk} can not be used as a prototype for {target_disk}'.format_map(fmt))
+        sys.exit(1)
+
+    if is_busy(target_disk):
+        print("Disk device {target_disk} is busy. Can't format it now".format_map(fmt))
+        sys.exit(1)
+
+    print('This will re-format disk {target_disk} so that it has the same disk\n'
+          'partion sizes and offsets as {proto_disk}. This will not copy\n'
+          'data from {proto_disk} to {target_disk}. But this will erase all\n'
+          'data on {target_disk}.\n'.format_map(fmt))
+
+    if not ask_yes_no("Do you wish to proceed?"):
+        print('OK. Disk drive {target_disk} will not be re-formated'.format_map(fmt))
+        sys.exit(0)
+
+    print('OK. Re-formating disk drive {target_disk}...'.format_map(fmt))
+
+    print('Making backup copy of partitions...')
+    backup_partitions(target_disk)
+    sleep(1)
+
+    print('Deleting old partitions...')
+    for p in list_partitions(target_disk):
+        delete_partition(disk=target_disk, partition_idx=p)
+
+    print('Creating new partitions on {target_disk} based on {proto_disk}...'.format_map(fmt))
+    format_disk_like(target=target_disk, proto=proto_disk)
+    print('Done.')