Installing *inside* an existing system --------------------------------------- A really neat feature of OSTree is that you can *parallel install* inside your existing OS. Let's try that, we first make sure we have the ostree packages: ``` yum -y install ostree ostree-grub2 ``` Next, we add `/ostree/repo` to the filesystem: ``` ostree admin init-fs / ``` Add a remote which points to the Fedora 27 content: ``` ostree remote add --set=gpgkeypath=/etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-27-primary fedora-ws-27 https://dl.fedoraproject.org/ostree/27/ ``` If you do not have the Fedora 27 GPG primary key, you can get it from https://getfedora.org/keys/. Alternatively, if you really need to, you can turn off GPG verification using the `--no-gpg-verify` option. Pull down the content (you can interrupt and restart this): ``` ostree --repo=/ostree/repo pull fedora-ws-27:fedora/27/x86_64/workstation ``` Initialize an "os" for this, which acts as a state root. ``` ostree admin os-init fedora ``` **For EFI systems**: currently ostree uses the presence of /boot/grub2/grub.cfg to detect a BIOS system, but that can be present on systems booted with EFI as well. If you boot with EFI (/sys/firmware/efi exists), then you need to move /boot/grub2/grub.cfg aside: ``` mv /boot/grub2/grub.cfg /boot/grub2/grub.cfg.bak ``` Since this file is not used on a EFI system, this won't break the operation of your current system. While you are at it, back up your existing grub config: ``` cp /boot/efi/EFI/fedora/grub.cfg /boot/efi/EFI/fedora/grub.cfg.bak ``` Deploy; we use `enforcing=0` to avoid SELinux issues for now, and --karg=rghb=0 to avoid a hang with Plymouth (these aren't needed if deploying Fedora 26 currently). ``` ostree admin deploy --os=fedora --karg-proc-cmdline --karg=enforcing=0 --karg=rhgb=0 fedora-ws-rawhide:fedora/rawhide/x86_64/workstation ``` To initialize this root, you'll need to copy over your `/etc/fstab`, `/etc/locale.conf`, `/etc/default/grub` at least, along with the ostree remote that we added: ``` for i in /etc/fstab /etc/default/grub /etc/locale.conf /etc/ostree/remotes.d/fedora-ws-rawhide.conf ; do cp $i /ostree/deploy/fedora/deploy/$checksum.0/$i; done ``` If you have a separate `/home` mount point, you'll need to change that `fstab` copy to refer to `/var/home`. If you *don't* have a separate /home mount point, then you need to make sure that a symlink will be created: ``` echo 'L /var/home - - - - ../sysroot/home' > /ostree/deploy/fedora/deploy/$checksum.0/etc/tmpfiles.d/00rpm-ostree.conf ``` You'll also need to copy your user entry from `/etc/passwd`, `/etc/group`, and `/etc/shadow` into the new `/etc/`, and add yourself to the wheel group in `/etc/group`. Don't copy just copy these files literally, however, since the system users and groups won't be the same. **For BIOS systems**: while ostree regenerated the bootloader configuration, it writes config into `/boot/loader/grub.cfg`. On a current `grubby` system, you'll need to copy that version over: ``` cp /boot/loader/grub.cfg /boot/grub2/grub.cfg ```