[LEDE-DEV] mount_root skipped on initramfs builds

[John Crispin]

On 06/08/2016 18:25, Josua Mayer wrote:
> Hi everyone,
> 
> During my work on supporting a block-device as overlay partition,
> without using extroot I came across this phenomenon:
> 
> When booting my mvebu-based board with an initramfs, mount_root was not
> executed. This seems unusual to me, I certainly expected the init
> process to be exactly the same.
> So I traced the cause to line 15 in the 80_mount_root preinit script.
> It says: [ "$INITRAMFS" = "1" ] || boot_hook_add preinit_main do_mount_root
> 
> Very clearly, this behaviour is intentional. Would anyone be willing to
> shed some light on why this is?
> Can it be removed? And if not: What is stopping us?

its by design. initramfs will reside in ram. in your usecase, you would
want to run the initramfs and then mount an external media as root. at
this point the initramfs's rootfs will continue to reside in ram and
waste it.

why do you not want to use extroot ? it is desinged for the exact
purpose of what you are trying to do.

	John

> 
> John I added you in CC because it is your commit that added the
> initramfs-check:
> https://git.lede-project.org/?p=source.git;a=blobdiff;f=package/base-files/files/lib/preinit/80_mount_root;h=9a99ee91097129205e7cee966ce4bf2ecd0d7c72;hp=ad24fb8ace70707e434c9980d948399834ce160f;hb=f43b7934d2850c2f545736253a0f8cbe4915fdff;hpb=1360067c4a75cd1804710e6f25871f695d3271b2
> 
> br
> Josua Mayer
> 
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