Commits on Oct 3, 2023

1. overlay.d/05core: Writeable root fs for Live ISOs booted from RAM …

   Previously, karg coreos.liveiso.fromram would cause live-generator to
   copy rootfs.img to a tmpfs and then mount it to /sysroot. Because
   rootfs.img contains a squashfs, /sysroot will be mounted read-only,
   preventing rpm-ostree operations such as install and rebase which are
   required by OKD/FCOS [0].
   
   Now, with karg coreos.liveiso.fromram (Live ISO) or coreos.live.\
   fromram (PXE boot) the rootfs.img will be mounted to /isoroot. The
   contents of /isoroot will be copied to /run/ephemeral and the latter
   will be bind-\ mounted to /sysroot. Because /run/ephemeral is a
   writeable xfs, both sysroot-etc.mount and sysroot-var.mount are not
   required in this case.
   
   For example, to rebase a FCOS/OKD bootimage first boot a Live ISO
   with Fedora 39 from RAM and then rebase and soft-reboot [1] (requires
   systemd v254) it with:
   
       rpm-ostree rebase fedora:fedora/x86_64/coreos/next
       rpm-ostree apply-live --allow-replacement
       systemctl soft-reboot
   
   [0] coreos/rpm-ostree#4547
   [1] https://www.freedesktop.org/software/systemd/man/systemd-soft-reboot.service.html

   

   JM1 committed Oct 3, 2023
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