845dc65196
Quoting Dan Nicholson in <https://github.com/ostreedev/ostree/pull/330#issuecomment-245499099> mtime of 0 has been the semantics of ostree deployments from basically the beginning of the project. We (and others, see flatpak/flatpak@b5204c9) rely on that fact when generating trees. In particular, this affects caches that use the mtime of the associated file or directory to determine if the cache is valid. By arbitrarily changing the mtime of the files to something else, all the caches we setup in the build are now invalidated. Preseeding caches is really important to the user experience as it avoids having the user wait while they're regenerated on first run. Now, we could change our build infrastructure to preset all the mtimes to 1 to match this change, but what does that do for our existing users who are on an ostree that deploys with mtimes of 0? We could just revert this change at Endless (and the associated one in Flatpak), and that would be fine for our users. However, if we point non-Endless users to our apps, they'll have the great experience of waiting 10 seconds the first time they launch it while the fontconfig cache is rebuilt unnecessarily. Closes: #495 Approved by: jlebon |
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