view .hgtags @ 26577:8f2ff40fe9c9

localrepo: execute appropriate actions for dirstate at releasing transaction

Before this patch, in-memory dirstate changes are still kept over a
transaction scope boundary regardless of the result of it.

For "all or nothing" policy of the transaction, in-memory dirstate
changes should be:

  - written out at successful closing a transaction, because
    subsequent 'dirstate.invalidate()' can lose them

  - discarded at failure of a transaction, because outer
    'wlock.release()' or so may write them out

To discard all changes in a transaction completely, this patch also
restores '.hg/dirstate' by '.hg/journal.dirstate' at failure, because
'transaction' itself does nothing for files related to '.hg/journal.*'
in such case (therefore, renaming in this patch is safe enough).

This is a part of preparations for "transactional dirstate". See also
the wiki page below for detail about it.

    https://mercurial.selenic.com/wiki/DirstateTransactionPlan

This patch also removes redundant 'dirstate.invalidate()' just before
aborting a transaction for shelve/unshelve.

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