tree 1a7079774a6c96a4f8590147a3e4d7180470ee96
parent 3f48022b77c0fb1edbc490892ce9f12205ab0a89
author Milton Miller <mdmii@outlook.com> 1692762783 -0500
committer Milton Miller <mdmii@outlook.com> 1692790673 -0500

initfs: Use a new tmpfs mount for run/initramfs

Keep /run/initramfs in shutdown but remove it at the beginning of init

Make /run/initramfs its own tmpfs so that switch_root doesn't nuke it

Refactor the root componet mountpoint name using the new variable api

Since systemd v254 now keeps the sys run proc dev mount trees under
/run/initramfs/ and doesn't force unmount ro and rw, we can switch
run/initramfs to a new tmpfs instead of a bind mount within run.

Repeated invocation of exec /init from /shutdown sh had been broken
since we started using switch_root because it removes all file content
in the same instance, including the run/initramfs/shutdown and friends
when starting the second boot because the former run/initramfs is part
of run and hence the new run/initrammfs.  This was purging our
INITRD_INTERFACE shutdown hook.

Signed-off-by: Milton Miller <miltonm@us.ibm.com>