105 lines
3.6 KiB
Python
105 lines
3.6 KiB
Python
# Copyright (c) 2024 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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import os
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from oslo_log import log as logging
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import sh
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from dccommon import consts
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from dcmanager.common import utils
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# The 'sh' library is magical - it looks up CLI functions dynamically.
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# Disable the pylint warnings here:
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# pylint: disable=not-callable,no-member
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LOG = logging.getLogger(__name__)
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def check_stale_bind_mount(mount_path, source_path):
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"""Check if the mount has become stale.
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We do this by comparing the directory inodes. If the bind mount is
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valid, the two directories should have the same inode number; otherwise
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the original directory has been replaced and we are no longer tracking
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the actual location of source_path. In this case we teardown the bind
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mount.
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"""
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mount_path_inode = sh.stat("--format", "%i", mount_path)
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source_path_inode = sh.stat("--format", "%i", source_path)
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if mount_path_inode != source_path_inode:
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failure_prefix = f"Failed to repair bind mount at {mount_path}"
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LOG.error(f"Found stale bind mount: {mount_path}: attempting repair")
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try:
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sh.umount(mount_path)
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except sh.ErrorReturnCode_32:
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# Exit code 32 is "mount failure"
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# Log the exception, but proceed with the rmdir, allowing a
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# remount attempt
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LOG.exception(f"{failure_prefix}: unmount failed (continuing)")
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except Exception:
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LOG.error(f"{failure_prefix}: unexpected umount failure")
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raise
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try:
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os.rmdir(mount_path)
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except Exception:
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LOG.error(f"{failure_prefix}: rmdir failed")
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raise
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return True
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return False
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# TODO(kmacleod): utils.synchronized should be moved into dccommon
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@utils.synchronized("ostree-mount-subclouds", external=True)
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def validate_ostree_iso_mount(software_version):
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"""Ensure the ostree_repo is properly mounted under the iso path.
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Validity check includes if the mount is stale.
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If stale, the bind mount is recreated.
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Note that ostree_repo is mounted in a location not specific to a subcloud.
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"""
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ostree_repo_mount_path = os.path.join(
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consts.SUBCLOUD_ISO_PATH, software_version, "ostree_repo"
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)
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ostree_repo_source_path = os.path.join(
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consts.SUBCLOUD_FEED_PATH,
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"rel-{version}".format(version=software_version),
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"ostree_repo",
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)
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LOG.debug(
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"Checking ostree_repo mount: %s against %s",
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ostree_repo_mount_path,
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ostree_repo_source_path,
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)
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if os.path.exists(ostree_repo_mount_path):
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check_stale_bind_mount(ostree_repo_mount_path, ostree_repo_source_path)
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# Check for the config file inside the ostree_repo
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check_path = os.path.join(ostree_repo_mount_path, "config")
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if not os.path.exists(check_path):
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LOG.info("Mounting ostree_repo at %s", ostree_repo_mount_path)
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if not os.path.exists(ostree_repo_mount_path):
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os.makedirs(ostree_repo_mount_path, mode=0o755)
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mount_args = (
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"--bind",
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ostree_repo_source_path,
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ostree_repo_mount_path,
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)
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try:
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sh.mount(*mount_args)
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except Exception as exc:
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LOG.warn(
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f"Command 'mount {' '.join(mount_args)}' failed; "
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f"attempting to rebuild: {str(exc)}"
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)
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try:
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sh.umount(ostree_repo_mount_path)
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except Exception:
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LOG.exception("rebuild: umount failed, continuing")
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os.rmdir(ostree_repo_mount_path)
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os.makedirs(ostree_repo_mount_path, mode=0o755)
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sh.mount(*mount_args)
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