tier-0: Rename to minimal

The "tiers" nomenclature ended up being unhelpful since
we introduced "tier-x" which is between tier-0 and tier-1.

We also never exposed the tier naming outside of our source
code. In preparation for doing so, rename to tier-0 to
"minimal" which is a bit more descriptive.

Renaming the other images will follow.

Signed-off-by: Colin Walters <walters@verbum.org>

minimal/basic-fixes.yaml

@@ -0,0 +1,29 @@
+# Fix general bugs
+
+postprocess:
+  # See also https://github.com/openshift/os/blob/f6cde963ee140c02364674db378b2bc4ac42675b/common.yaml#L156
+  # This one is undoes the effect of
+  # # RHEL-only: Disable /tmp on tmpfs.
+  #Wants=tmp.mount
+  # in /usr/lib/systemd/system/basic.target
+  # We absolutely must have tmpfs-on-tmp for multiple reasons,
+  # but the biggest is that when we have composefs for / it's read-only,
+  # and for units with ProtectSystem=full systemd clones / but needs
+  # a writable place.
+  - |
+    #!/usr/bin/env bash
+    set -xeuo pipefail
+    mkdir -p /usr/lib/systemd/system/local-fs.target.wants
+    if test '!' -f /usr/lib/systemd/system/local-fs.target.wants/tmp.mount; then
+      ln -sf ../tmp.mount /usr/lib/systemd/system/local-fs.target.wants
+    fi
+
+    # See https://github.com/containers/bootc/issues/358
+    # basically systemd-tmpfiles doesn't follow symlinks; ordinarily our
+    # tmpfiles.d unit for `/var/roothome` is fine, but this actually doesn't
+    # work if we want to use tmpfiles.d to write to `/root/.ssh` because
+    # tmpfiles gives up on that before getting to `/var/roothome`.
+    sed -i -e 's, /root, /var/roothome,' /usr/lib/tmpfiles.d/provision.conf
+    # Because /var/roothome is also defined in rpm-ostree-0-integration.conf
+    # we need to delete /var/roothome
+    sed -i -e '/^d- \/var\/roothome /d' /usr/lib/tmpfiles.d/provision.conf