A Desktop built before the blobless fix keeps walking history during
`hermes update`. On a treeless (tree:0) checkout every walk downloads trees
again, and #129514 filled a 434 GB disk during the minutes of dependency work.
The one-time conversion (#133016) ran at the very end of the update, after that
window. Both update hand-offs (update_completion._prepare and an older
updater's _update_takeover.prepare) now run it first, in the bootstrap
interpreter, and the late call is gone.
Re-running install.sh / install.ps1 over a treeless checkout now converts it
too. The filter is recorded only after the refetch succeeds, so a failure is
retried by the next update instead of leaving a blob:none filter over a
history that has no trees.
The pack cleanup also sweeps tmp_* transfer files that killed fetches left
behind. They are more than an hour old, a storm leaves gigabytes of them,
and git itself only prunes them after two weeks. The docs gain the recovery
steps for a disk that the storm already filled.
Co-authored-by: Brooklyn Nicholson <brooklyn.bb.nicholson@gmail.com>
Co-authored-by: Yuan Li <dskwelmcy@163.com>
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