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transaction: add support for non-append files...
transaction: add support for non-append files This adds support for normal, non-append-only files in transactions. For example, .hg/store/fncache and .hg/store/phaseroots should be written as part of the transaction, but are not append only files. This adds a journal.backupfiles along side the normal journal. This tracks which files have been backed up as part of the transaction. transaction.addbackup() creates a backup of the file (using a hardlink), which is later used to recover in the event of the transaction failing. Using a seperate journal allows the repository to still be used by older versions of Mercurial. A future patch will use this functionality and add tests for it.
Mads Kiilerich - - Load All Authors

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r20245:4edd179f default
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revisions.txt
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/ mercurial / help / revisions.txt
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Mercurial supports several ways to specify individual revisions.
A plain integer is treated as a revision number. Negative integers are
treated as sequential offsets from the tip, with -1 denoting the tip,
-2 denoting the revision prior to the tip, and so forth.
A 40-digit hexadecimal string is treated as a unique revision
identifier.
A hexadecimal string less than 40 characters long is treated as a
unique revision identifier and is referred to as a short-form
identifier. A short-form identifier is only valid if it is the prefix
of exactly one full-length identifier.
Any other string is treated as a bookmark, tag, or branch name. A
bookmark is a movable pointer to a revision. A tag is a permanent name
associated with a revision. A branch name denotes the tipmost open branch head
of that branch - or if they are all closed, the tipmost closed head of the
branch. Bookmark, tag, and branch names must not contain the ":" character.
The reserved name "tip" always identifies the most recent revision.
The reserved name "null" indicates the null revision. This is the
revision of an empty repository, and the parent of revision 0.
The reserved name "." indicates the working directory parent. If no
working directory is checked out, it is equivalent to null. If an
uncommitted merge is in progress, "." is the revision of the first
parent.