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https://github.com/morgan9e/systemd
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c6c5d20de5
This reverts commit 6b219b74de.
This commit doesn't look right to me. We have to unmount everything
recursively *before* we MS_MOVE because the MS_MOVE will not get rid of
it for us, and we simply cannot access these mounts after the MS_MOVE is
complete anymore.
This is a fundamental difference between MS_MOVE and pivot_root(). The
latter repivots the entire mount table getting rid of anything outside
of the new root. MS_MOVE otoh just mounts a bunch of mount points to the
top, leaving in place whatever might be underneath it.
Thus, if we go through the MS_MOVE codepath we must unmount everything
explicitly before doing so because otherwise the mounts will be pinned
forever, but be entirely invisble to userspace.
14 lines
658 B
C
14 lines
658 B
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <stdbool.h>
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typedef enum SwitchRootFlags {
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SWITCH_ROOT_DESTROY_OLD_ROOT = 1 << 0, /* rm -rf old root when switching – under the condition
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* that it is backed by non-persistent tmpfs/ramfs/… */
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SWITCH_ROOT_DONT_SYNC = 1 << 1, /* don't call sync() immediately before switching root */
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SWITCH_ROOT_RECURSIVE_RUN = 1 << 2, /* move /run/ with MS_REC from old to new root */
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} SwitchRootFlags;
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int switch_root(const char *new_root, const char *old_root_after, SwitchRootFlags flags);
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