[gnome-build-meta/wip/wjt/eos-updater-ostree-version-note] core-deps/eos-updater: Warn about dep on unreleased ostree

[Will Thompson <wjt src gnome org>]

commit 86599381be493ad93c1b305b05567c08c617611a
Author: Will Thompson <wjt endlessos org>
Date:   Fri Sep 9 11:01:03 2022 +0100

    core-deps/eos-updater: Warn about dep on unreleased ostree
    
    I'm leaving a note here because the failure mode is that you update to
    an OS build containing the new eos-updater version, and then you get
    stuck.

 elements/core-deps/eos-updater.bst | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/elements/core-deps/eos-updater.bst b/elements/core-deps/eos-updater.bst
index 328f18831..9c2c7d33f 100644
--- a/elements/core-deps/eos-updater.bst
+++ b/elements/core-deps/eos-updater.bst
@@ -1,5 +1,14 @@
 kind: meson
 
+# Beware of updating to 5.x.x tags when they appear.
+#
+# Commit 44348e2 (Revert "apply: Don't use staged deployments when /boot is
+# automounted") requires a version of ostree that includes f3db79e7
+# (finalize-staged: Ensure /boot automount doesn't expire). Without that ostree
+# change, staged updates will not be applied at shutdown.
+#
+# As of September 2022, eos-updater doesn't have a build-time dependency on a
+# new-enough libostree because no such version has been released.
 sources:
 - kind: tar
   url: github_files:endlessm/eos-updater/archive/Release_4.0.7.tar.gz