op-mode: raid: T5608: define add/delete raid member

1 files changed, 71 insertions, 0 deletions

diff --git a/python/vyos/raid.py b/python/vyos/raid.py
new file mode 100644
index 000000000..7fb794817
--- /dev/null
+++ b/python/vyos/raid.py
@@ -0,0 +1,71 @@
+# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+from vyos.utils.disk import device_from_id
+from vyos.utils.process import cmd
+
+def raid_sets():
+    """
+    Returns a list of RAID sets
+    """
+    with open('/proc/mdstat') as f:
+        return [line.split()[0].rstrip(':') for line in f if line.startswith('md')]
+
+def raid_set_members(raid_set_name: str):
+    """
+    Returns a list of members of a RAID set
+    """
+    with open('/proc/mdstat') as f:
+        for line in f:
+            if line.startswith(raid_set_name):
+                return [l.split('[')[0] for l in line.split()[4:]]
+    return []
+
+def partitions():
+    """
+    Returns a list of partitions
+    """
+    with open('/proc/partitions') as f:
+        p = [l.strip().split()[-1] for l in list(f) if l.strip()]
+    p.remove('name')
+    return p
+
+def add_raid_member(raid_set_name: str, member: str, by_id: bool = False):
+    """
+    Add a member to an existing RAID set
+    """
+    if by_id:
+        member = device_from_id(member)
+    if raid_set_name not in raid_sets():
+        raise ValueError(f"RAID set {raid_set_name} does not exist")
+    if member not in partitions():
+        raise ValueError(f"Partition {member} does not exist")
+    if member in raid_set_members(raid_set_name):
+        raise ValueError(f"Partition {member} is already a member of RAID set {raid_set_name}")
+    cmd(f'mdadm --add /dev/{raid_set_name} /dev/{member}')
+    disk = cmd(f'lsblk -ndo PKNAME /dev/{member}')
+    cmd(f'grub-install /dev/{disk}')
+
+def delete_raid_member(raid_set_name: str, member: str, by_id: bool = False):
+    """
+    Delete a member from an existing RAID set
+    """
+    if by_id:
+        member = device_from_id(member)
+    if raid_set_name not in raid_sets():
+        raise ValueError(f"RAID set {raid_set_name} does not exist")
+    if member not in raid_set_members(raid_set_name):
+        raise ValueError(f"Partition {member} is not a member of RAID set {raid_set_name}")
+    cmd(f'mdadm --remove /dev/{raid_set_name} /dev/{member}')