Hi Dennis, On Tue, 2014-01-21 at 07:40 +0100, Dennis Jacobfeuerborn wrote: > Interesting. I've downloaded the VM Image and tried to understand the > setup. Some bits are documented here https://people.gnome.org/~walters/ostree/doc/layout.html > Apparently there exist sort of two root trees / and /sysroot in > the system with some links targeting the /sysroot tree. With OSTree, you boot directly into a chroot - dracut switches root and starts systemd right after mounting the rootfs. See: https://git.gnome.org/browse/ostree/tree/src/switchroot/ostree-prepare-root.c /sysroot is a bind mount to the real root /. > What I'm > wondering about is that /dev/mapper/fedora-root is mounted several times > on /, /var, /usr and /sysroot (twice!) sometimes rw and sometimes ro. /usr is simply a bind mount to itself so it can be mounted read-only. This is important because otherwise one could corrupt the object store in /ostree/repo by mutating the hardlink farm in /usr. Note the /usr here is really /ostree/deploy/fedostree/deploy/<checksum.serial>/usr as seen from the physical root. /var is a special bind mount to /ostree/deploy/fedostree/var which is shared between each deployment (chroot). > The impression I get is that /sysroot is the actual root fs in the image > and / the ostree directory at least that's what the links seem to > suggest. I still don't understand the mount-voodoo though. Is there some > documentation about this available? I'll look at adding more to the gtk-doc, though I suspect I may need to make a separate "system administrators new to OSTree" document which is a bit distinct from the "how to use OSTree underneath your package manager" document that the current one is. -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
