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8a6898b88d
In Mercurial source tree, opening a file in "a"/"a+" mode like below
doesn't specify atomictemp=True for vfs, and this avoids file stat
ambiguity check by atomictempfile.
- writing changes out in revlog layer uses "a+" mode
- truncation in repair.strip() uses "a" mode
- truncation in transaction._playback() uses "a" mode
If steps below occurs at "the same time in sec", all of mtime, ctime
and size are same between (1) and (3).
1. append data to revlog-style file (and close transaction)
2. discard appended data by truncation (strip or rollback)
3. append same size but different data to revlog-style file again
Therefore, cache validation doesn't work after (3) as expected.
This patch adds file object wrapper class checkambigatclosing to check
(and get rid of) ambiguity at closing. It is used by vfs in subsequent
patch.
This is a part of ExactCacheValidationPlan.
https://www.mercurial-scm.org/wiki/ExactCacheValidationPlan
BTW, checkambigatclosing is tested in test-filecache.py, even though
it doesn't use filecache itself, because filecache assumes that file
stat ambiguity never occurs (and there is no another test-*.py related
to filecache).
64 lines
1.1 KiB
Plaintext
64 lines
1.1 KiB
Plaintext
basic:
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* neither file exists
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creating
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* neither file still exists
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* empty file x created
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creating
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* file x changed size
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creating
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* nothing changed with either file
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* file x changed inode
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creating
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* empty file y created
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creating
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* file y changed size
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creating
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* file y changed inode
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creating
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* both files changed inode
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creating
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fakeuncacheable:
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* neither file exists
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creating
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* neither file still exists
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creating
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* empty file x created
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creating
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* file x changed size
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creating
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* nothing changed with either file
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creating
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* file x changed inode
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creating
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* empty file y created
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creating
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* file y changed size
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creating
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* file y changed inode
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creating
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* both files changed inode
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creating
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repository tip rolled back to revision -1 (undo commit)
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working directory now based on revision -1
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repository tip rolled back to revision -1 (undo commit)
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working directory now based on revision -1
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setbeforeget:
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* neither file exists
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string set externally
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* file x created
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creating
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string from function
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* string set externally again
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string 2 set externally
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* file y created
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creating
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string from function
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antiambiguity:
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