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initramfs-framework: unmount automounts before switch_root

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If mounts are left lingering, then after we switch_root, attempts to
modify the block devices will result in an EBUSY with no way to unmount
them.  As we're about to switch_root anyways, there isn't much use to
keep anything mounted unless it has the new rootfs.

(From OE-Core rev: 999883990235251127b65f2277dcb40004e7f657)

Signed-off-by: Justin Bronder <jsbronder@cold-front.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 4dc7af6d25597ea10ea43e76c7c3d7251462c0e5)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
(cherry picked from commit 991631492f4fafc1852113a34a60b025342518b6)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Justin Bronder 2022-02-10 15:23:22 -05:00 committed by Richard Purdie
parent 36562d3019
commit b1ce735cc5
1 changed files with 12 additions and 0 deletions
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12
meta/recipes-core/initrdscripts/initramfs-framework/finish
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@ -12,6 +12,18 @@ finish_run() {
fatal "ERROR: There's no '/dev' on rootfs."
fi
# Unmount anything that was automounted by busybox via mdev-mount.sh.
# We're about to switch_root, and leaving anything mounted will prevent
# the next rootfs from modifying the block device. Ignore ROOT_DISK,
# if it was set by setup-live, because it'll be mounted over loopback
# to ROOTFS_DIR.
local dev
for dev in /run/media/*; do
if mountpoint -q "${dev}" && [ "${dev##*/}" != "${ROOT_DISK}" ]; then
umount -f "${dev}" || debug "Failed to unmount ${dev}"
fi
done
info "Switching root to '$ROOTFS_DIR'..."
debug "Moving /dev, /proc and /sys onto rootfs..."