overlayfs-etc compatibility with volatile-bind

[Baruch Siach <baruch@tkos.co.il>]

Hi Vyacheslav Yurkov,

overlayfs-etc generates a 'preinit' script that unconditionally remounts
root to make it writable. Later systemd-fstab-generator generates a
mount unit (-.mount) that restores read-only as set in /etc/fstab.

I added an entry to VOLATILE_BINDS for the /home directory. The volatile-binds
recipe creates a systemd mount unit with the condition

  ConditionPathIsReadWrite=!/home

The trouble is that there is no dependency between the rootfs mount unit and
the /home unit. When the /home unit runs first, the condition is false, and
the unit fails. If I later start the /home unit manually, it succeeds, because
rootfs is read-only now.

What is the purpose of mounting root rw in 'preinit'?

Is there any other alternative to make volatile-binds do the right thing?

Thanks,
baruch

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