upstream/mercurial-mirror Files · mercurial/cffi/bdiffbuild.py

sqlitestore: support for storing revisions without their parents...

sqlitestore: support for storing revisions without their parents This commit kinda/sorta implements the equivalent of ellipsis nodes for the SQLite storage backend. Without implementing full blown ellipsis nodes (and the necessary support for them in the wire protocol), we instead teach the store to rewrite the p1 and p2 nodes to nullid when the incoming parent isn't in the local store. This allows servers to remain dumb and send the real parent and have the clients deal with the missing parent problem. This obviously isn't ideal because a benefit of ellipsis nodes is we can insert a fake parent to ellide missing changesets. But neither solution is ideal because it drops the original parent from storage. We could probably teach the SQLite store to retain the original parent and handle missing parents at read time. However, parent revisions are stored as integers and it isn't trivial to store an "empty" revision in the store yet, which would be necessary to represent the "missing" parent. The store is somewhat intelligent in trying to remove the missing parents metadata when the revision is re-added. But, revision numbers will be all messed up in that case, so I'm not sure it is worth it. At some point we'll likely want to remove the concept of revision numbers from the database and have the store invent them at index generation time. Or even better, we can do away with revision numbers from the file storage interface completely. We'll get there eventually... Differential Revision: https://phab.mercurial-scm.org/D5168

Yuya Nishihara - - Load All Authors

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        Yuya Nishihara
    
cffi: rename build scripts...

              r32505
            
      from __future__ import absolute_import

      import cffi

      import os

      ffi = cffi.FFI()

        Augie Fackler
    
cleanup: fix some latent open(path).read() et al calls we previously missed...

              r36966
            
      with open(os.path.join(os.path.join(os.path.dirname(__file__), '..'),

                             'bdiff.c')) as f:

          ffi.set_source("mercurial.cffi._bdiff",

                         f.read(), include_dirs=['mercurial'])

        Yuya Nishihara
    
cffi: rename build scripts...

              r32505
            
      ffi.cdef("""

      struct bdiff_line {

          int hash, n, e;

          ssize_t len;

          const char *l;

      };

      struct bdiff_hunk;

      struct bdiff_hunk {

          int a1, a2, b1, b2;

          struct bdiff_hunk *next;

      };

      int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);

      int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,

          struct bdiff_hunk *base);

      void bdiff_freehunks(struct bdiff_hunk *l);

      void free(void*);

      """)

      if __name__ == '__main__':

          ffi.compile()

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Yuya Nishihara cffi: rename build scripts...	r32505	from __future__ import absolute_import

		import cffi
		import os

		ffi = cffi.FFI()
Augie Fackler cleanup: fix some latent open(path).read() et al calls we previously missed...	r36966	with open(os.path.join(os.path.join(os.path.dirname(__file__), '..'),
		'bdiff.c')) as f:
		ffi.set_source("mercurial.cffi._bdiff",
		f.read(), include_dirs=['mercurial'])
Yuya Nishihara cffi: rename build scripts...	r32505	ffi.cdef("""
		struct bdiff_line {
		int hash, n, e;
		ssize_t len;
		const char *l;
		};

		struct bdiff_hunk;
		struct bdiff_hunk {
		int a1, a2, b1, b2;
		struct bdiff_hunk *next;
		};

		int bdiff_splitlines(const char a, ssize_t len, struct bdiff_line *lr);
		int bdiff_diff(struct bdiff_line a, int an, struct bdiff_line b, int bn,
		struct bdiff_hunk *base);
		void bdiff_freehunks(struct bdiff_hunk *l);
		void free(void*);
		""")

		if __name__ == '__main__':
		ffi.compile()