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initramfs: switch to tmpfs to fix ujail

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Hauke wrote:
> We want to run some processes in the procd-ujail, this works when we
> use a SquashFS image and an overlay file system, but when we use an
> initramfs it does not work.
> [...]
> When we switch from initramfs to tmpfs, it is working, we added this
> code to target/linux/generic/other-files/init to make [it] work.

Move files to newly mounted tmpfs and then use switch_root to chroot
into new rootfs and free initramfs.

Suggested-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle
2020-11-27 01:00:31 +01:00
parent 8a87ab43d1
commit 7fd3c68137
1 changed files with 11 additions and 1 deletions
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12
target/linux/generic/other-files/init
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@@ -1,4 +1,14 @@
#!/bin/sh #!/bin/sh
# Copyright (C) 2006 OpenWrt.org # Copyright (C) 2006 OpenWrt.org
export INITRAMFS=1 export INITRAMFS=1
exec /sbin/init
# switch to tmpfs to allow run daemons in jail on initramfs boot
DIRS=$(echo *)
NEW_ROOT=/new_root
mkdir -p $NEW_ROOT
mount -t tmpfs tmpfs $NEW_ROOT
cp -pr $DIRS $NEW_ROOT
exec switch_root $NEW_ROOT /sbin/init