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6dd32f4a3b
Overlayfs-etc is useful if the rootfs is read-only. One reason to have the rootfs read-only is to allow image based updating. Image based updating will change the underlying root file system, which is unsupported by overlayfs when with some mount options [1]. This disables those options. [1] https://www.kernel.org/doc/html/latest/filesystems/overlayfs.html?highlight=overlayfs#changes-to-underlying-filesystems (From OE-Core rev: 13a057d6ffc3110f891224d7af9455b53581e8a8) Signed-off-by: Claudius Heine <ch@denx.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
38 lines
1.0 KiB
Bash
38 lines
1.0 KiB
Bash
#!/bin/sh
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echo "PREINIT: Start"
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PATH=/sbin:/bin:/usr/sbin:/usr/bin
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mount -o remount,rw /
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mkdir -p /proc
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mkdir -p /sys
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mkdir -p /run
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mkdir -p /var/run
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
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mkdir -p {OVERLAYFS_ETC_MOUNT_POINT}
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if mount -n -t {OVERLAYFS_ETC_FSTYPE} \
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-o {OVERLAYFS_ETC_MOUNT_OPTIONS} \
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{OVERLAYFS_ETC_DEVICE} {OVERLAYFS_ETC_MOUNT_POINT}
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then
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mkdir -p {OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/upper
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mkdir -p {OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/work
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mount -n -t overlay \
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-o upperdir={OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/upper \
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-o lowerdir=/etc \
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-o workdir={OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/work \
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-o index=off,xino=off,redirect_dir=off,metacopy=off \
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{OVERLAYFS_ETC_MOUNT_POINT}/overlay-etc/upper /etc || \
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echo "PREINIT: Mounting etc-overlay failed!"
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else
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echo "PREINIT: Mounting </data> failed!"
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fi
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echo "PREINIT: done; starting </sbin/init>"
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exec {SBIN_INIT_NAME}
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