[PATCH 3 of 4 v5] revlog: REVIDX_ISSTOREDEXTERNALLY flag

Augie Fackler raf at durin42.com
Fri Dec 16 15:47:19 EST 2016


On Wed, Dec 14, 2016 at 11:58:09AM +0000, Remi Chaintron wrote:
> # HG changeset patch
> # User Remi Chaintron <remi at fb.com>
> # Date 1481715180 0
> #      Wed Dec 14 11:33:00 2016 +0000
> # Branch stable
> # Node ID 217f7db4dae3309bec78e27c85cc90e924b109be
> # Parent  f4cd0db914fa6df17fdb733cdcf8b18ec79f8c0c
> revlog: REVIDX_ISSTOREDEXTERNALLY flag
>
> Add the REVIDX_ISSTOREDEXTERNALLY flag, for extensions to register transforms on
> in REVIDX_FLAGS_TRANSFORMS. This will be used by the `lfs` extension to read
> filelog data from the remote store.
>
> diff --git a/mercurial/help/internals/revlogs.txt b/mercurial/help/internals/revlogs.txt
> --- a/mercurial/help/internals/revlogs.txt
> +++ b/mercurial/help/internals/revlogs.txt
> @@ -88,7 +88,9 @@
>  0-5 (6 bytes)
>     Absolute offset of revision data from beginning of revlog.
>  6-7 (2 bytes)
> -   Bit flags impacting revision behavior.
> +   Bit flags impacting revision behavior. The following bit offsets define:
> +   0: 'censored' flag.
> +   1: 'storedexternally' flag.
>  8-11 (4 bytes)
>     Compressed length of revision data / chunk as stored in revlog.
>  12-15 (4 bytes)
> diff --git a/mercurial/revlog.py b/mercurial/revlog.py
> --- a/mercurial/revlog.py
> +++ b/mercurial/revlog.py
> @@ -54,15 +54,16 @@
>
>  # revlog index flags
>  REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
> +REVIDX_ISSTOREDEXTERNALLY = (1 << 14) # revision data is stored externally
>  REVIDX_DEFAULT_FLAGS = 0
> -REVIDX_KNOWN_FLAGS = REVIDX_ISCENSORED
> +REVIDX_KNOWN_FLAGS = REVIDX_ISCENSORED | REVIDX_ISSTOREDEXTERNALLY
>  # stable order in which flags need to be processed and their transforms applied
>  REVIDX_FLAGS_ORDER = [
>      REVIDX_ISCENSORED,
> +    REVIDX_ISSTOREDEXTERNALLY,
>  ]
>  REVIDX_FLAGS_TRANSFORMS = { }
>
> -
>  # max size of revlog with inline data
>  _maxinline = 131072
>  _chunksize = 1048576
> @@ -1716,6 +1717,10 @@
>          """Check if a file revision is censored."""
>          return False
>
> +    def islargefile(self, rev):
> +        """Check if a file revision is flagged as large."""
> +        return self.flags(rev) & REVIDX_ISLARGEFILE

NameError: REVIDX_ISLARGEFILE

> +
>      def _peek_iscensored(self, baserev, delta, flush):
>          """Quickly check if a delta produces a censored revision."""
>          return False
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